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general description the max14890e incremental encoder receiver contains four differential receivers and two single-ended receivers. the differential receivers can be operated in rs-422 or differential high-threshold logic (htl) modes and are optionally configurable for single-ended ttl/htl operation. the max14890e features a wide common mode input range of -20v to +20v in rs-422 mode. the auxiliary iec 61131-2 type-1/type-3 digital inputs are designed for operation with switches or proximity sensors and can be individually configured for ttl operation. all receiver input signals are fault protected to voltage shorts in the 40v range. per channel fault detection provides warning of irregular conditions such as small differential signals, shorts, opens, overvoltages, and undervoltages. the max14890e features a pin-selectable spi or parallel- logic interface. spi control provides detailed diagnostics and individual configurations for receivers. the max14890e is available in a 32-pin tqfn-ep (5mm x 5mm) and operates over the -40c to +125c tempera - ture range. beneits and features high flexibility supports all encoder types ? selectable rs-422/htl/ttl/di receivers ? rs-422/ttl switching rates up to 35mbps ? htl switching rates up to 400khz ? spi or pin-controlled operation ? spi interface allows per-receiver coniguration ? 1.62v to 5.5v logic interface integrated fault detection reduces down-time ? open-wire and short-circuit detection ? overvoltage and undervoltage fault detection integrated protection ensures robust communication ? 40v fault protection range ? 20v rs-422 common mode range ? di glitch filters ? 25kv hbm esd ? 7kv air-gap per iec 61000-4-2 esd ? 10kv contact per iec 61000-4-2 esd ? -40c to +125c operating temperature range applications encoder interfaces motor controllers pulse counters servo control commutation ordering information appears at end of data sheet. 19-7536; rev 0; 3/15 a a rxa b rxb rxz v cc b proximity sensor proximity sensor encoder asic rs-422 a rs-422 b counter/ motor controller max14890 di/ttly = 1 ttl/sdi = 1 sngl/clk = 0 di/ttl3 = 1 di/ttl2 = 1 afault zz rs-422 z rxy diy ttl alarm rxd2 di2 rxd3 v l di3 5v 3.3v to 5v 5v bfault 5v zfault 5v yfault 5v ao bo zo yo lo2 lo3 do do 120 ? 120 ? 120 ? encoder circuit with rs-422 signals and ttl alarm signal typical operating circuit input receiver modes mode rxa rxb rxz rxy rxdi2 rxdi3 rs-422 d-htl se-htl ttl di max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs downloaded from: http:///
(all voltages referenced to gnd) v cc .......................................................................... -0.3v to +6v v l ............................................................ -0.3v to (v cc + 0.3v) ao, bo, zo, yo, lo, lo2, lo3 ................. -0.3v to (v l + 0.3v) _fault , d2fault / irq ........................................... -0.3v to +6v d3fault / sdo (spi is high) ...................... -0.3v to (v l + 0.3v) d3fault /sdo (spi is low) .................................. -0.3v to +6v ttl/sdi, sngl/sclk, hith/ cs , di/ttly, di/ttl2, di/ttl3, spi ........................................ -0.3v to +6v a, a , b, b , z, z , diy, y , di2, di3 ............................ -40v to +40v short-circuit duration (_o, _fault , lo2, d2fault / irq , lo3, d3fault /sdo to gnd) ..... continuous continuous power dissipation (t a = +70c) thin qfn (derate 19mw/ c above +70 c) ............... 1520mw operating temperature range ......................... -40 c to +125 c junction temperature ...................................................... +150c storage temperature range ............................ -65 c to +150 c lead temperature (soldering, 10s) ................................. +300c soldering temperature (reflow) ...................................... +260c junction-to-ambient thermal resistance ( ja ) .............. 36c/w junction-to-case thermal resistance ( jc ) ..................... 3c/w (note 1) electrical characteristics (v cc = 5v10%, v l = 1.62v to v cc , t a = -40c to +125c unless otherwise noted. typical values are at v cc = 5v, v l = 3.3v, t a = +25c.) (notes 2, 3) parameter symbol conditions min typ max units power supply supply voltage v cc 4.5 5.5 v supply current i cc outputs not switching, no load 9 14 ma logic supply voltage v l 1.62 5.5 v rs-422 receivers (rxa, rxb, rxz, rxy) differential threshold voltage v th -20v v cm +20v -200 +200 mv differential input hysteresis v th -20v v cm +20v 230 mv single-ended input current i in v cc = 0v or 5v v in = +10v +100 +160 a v in = -10v -270 -170 low differential voltage fault threshold v th_dfp -20v v cm +20v, positive +270 +460 mv v th_dfn -20v v cm +20v, negative -460 -270 single-ended input fault threshold v th_selp positive +15 +18 v v th_seln negative -18 -15 differential htl receivers (rxa, rxb, rxz) differential threshold voltage v th 0v v cm +25v -900 +900 mv differential input hysteresis v th 0v v cm +25v 1 v single-ended input current i in v th = +24v +280 +460 a v th = -10v -270 -170 max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 2 note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal characteristics downloaded from: http:///
electrical characteristics (continued) (v cc = 5v10%, v l = 1.62v to v cc , t a = -40c to +125c unless otherwise noted. typical values are at v cc = 5v, v l = 3.3v, t a = +25c.) (notes 2, 3 ) parameter symbol conditions min typ max units low differential voltage fault threshold v th_dfp 0v v cm +24v, positive +1.2 +2.0 v v th_dfn 0v v cm +24v, negative -2.0 -1.2 single-ended input fault threshold v th_sen negative -18 -15 v single-ended htl receivers (rxa, rxb, rxz) input logic high voltage v ih_se hith is low 8 40 v hith is high 13 40 input logic low voltage v il_se hith is low -40 6 v hith is high -40 11 input hysteresis v ith_se 270 mv input current (a, b, z) i _htl v cc = 0v or normally powered, v in = 24v 460 a input current ( a , b , z ) i _htl v cc = 0v or normally powered, v in = 24v 460 a fault threshold voltage v th_htlf -18 -15 v ttl receivers (rxa, rxb, rxz, rxy, rxd2, rxd3) input high voltage v ih_ttl ttl mode 2.0 40 v input low voltage v il_ttl ttl mode -40 0.8 v input hysteresis v hy_ttl ttl mode 0.53 v input current (a, b, z, diy, di2, di3) i _ttl ttl mode, v cc = 0v or 5v, v in = 5v 85 a input current ( a , b , z , y ) i _ttl ttl mode, v cc = 0v or 5v, v in = 5v 85 fault threshold voltage v th_ttlf negative -18 -15 v positive +15 +18 digital input receivers (di2, di3, rxy, rxz) input high voltage v ih_di di mode, hith is high or low 8 40 v input low voltage v il_di di mode, hith is high or low -40 5.5 v input hysteresis v hy_di di mode, hith is high or low 1.2 v max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 3 downloaded from: http:///
electrical characteristics (continued) (v cc = 5v10%, v l = 1.62v to v cc , t a = -40c to +125c unless otherwise noted. typical values are at v cc = 5v, v l = 3.3v, t a = +25c.) (notes 2, 3) parameter symbol conditions min typ max units current sink i di di mode, 0v v di 5v 0 2.6 ma di mode, 8v v di 40v 2 2.5 3.3 fault threshold voltage v th_dif di mode -18 -15 v logic interface (ao, afault , bo, bfault , zo, zfault , yo, yfault , lo2, d2fault/irq , lo3, d3fault /sdo, di/ ttly, di/ttl2, di/ttl3, spi, ttl/sdi, sngl/clk, hith/ cs ) input high voltage v ih di/ttly, di/ttl2, di/ttl3, spi, ttl/sdi, sngl/clk, hith/ cs 2/3 x v l v input low voltage v il di/ttly, di/ttl2, di/ttl3, spi, ttl/sdi, sngl/clk, hith/ cs 1/3 x v l v input current i in di/ttly, di/ttl2, di/ttl3, spi, ttl/sdi, sngl/clk, hith/ cs -1 +1 a output high voltage v oh ao, bo, zo, yo, lo2, lo3, ao, bo, zo, yo, lo2, lo3, d2fault / irq , d3fault / sdo, i out = -3ma (note 4) v l - 0.4v v output low voltage v ol ao, bo, zo, yo, lo2, lo3, d3fault / sdo, afault , bfault , zfault , yfault , d2fault / irq , i out = +3ma 0.4 v protection thermal-shutdown threshold t shdn temperature rising +160 c thermal-shutdown hysteresis t hyst 10 c fault-protected input voltage range (a, a , b, b , z, z , diy, y, di2, di3) v in_f -40 +40 v esd protection (a, a , b, b , z, z , diy, y , di2, di3) iec 61000-4-2 air-gap discharge to gnd 7 kv iec 61000-4-2 contact discharge to gnd 10 human body model 25 esd protection (all other pins) human body model 2 kv max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 4 downloaded from: http:///
switching characteristics (v cc = 5v10%, v l = 1.62v to v cc , t a = -40c to +125c unless otherwise noted. typical values are at v cc = 5v, v l = 3.3v, t a = +25c.) (notes 2, 3) parameter symbol conditions min typ max units receiver (rxa, rxb, rxz) (note 4) rs-422 maximum data rate dr max422 rs-422 mode 35 mbps rs-422 receiver propagation delay t dplh_422 rs-422 mode, c l = 15pf, v id = 3v, figures 1, 2 25 ns t dphl_422 25 rs-422 receiver propagation de- lay skew |t dplh_422 - t dphl_422| t hl- skew_422 rs-422 mode, c l = 15pf, v id = 3v, figures 1, 2 0 5 ns rs-422 receiver channel-to-channel skew |t c- skew_422 | rs-422 mode, c l = 15pf, v id = 3v, figures 1, 2 0 8 ns differential htl (d-htl) maximum differential data rate dr dhtl d-htl mode 1 mbps d-htl receiver propagation delay t dplh_dhtl d-htl mode, c l = 15pf, v id = 24v, figures 1, 2 100 ns t dphl_dhtl 100 d-htl differential receiver propagation delay skew |t dplh_dhtl - t dphl_dhtl| t hlskew_ dhtl d-htl mode, c l = 15pf, v id = 24v, figures 1, 2 0 20 ns d-htl differential receiver channel-to-channel skew |t cskew_ dhtl | d-htl mode, c l = 15pf, v id = 24v, figures 1, 2 0 8 ns single-ended (se-htl) maximum switching rate sr sehtl se-htl mode, hith is high or low 400 khz se-htl receiver propagation delay t dplh_ sehtl se-htl mode, hith is high or low, c l = 15pf, 0v v in +24v, figures 1, 2 0 100 ns t dphl_ sehtl 0 100 se-htl receiver propagation delay skew |t dplh_sehtl - t dphl_sehtl | t hlskew_ sehtl se-htl mode, c l = 15pf, 0v v in +24v hith is low 0 28 ns hith is high 0 20 se-htl receiver channel-to- channel skew |t cskew_ sehtl | se-htl mode, hith is high or low, c l = 15pf, 0v v in +24v, figures 1, 2 0 11 ns ttl maximum switching rate sr ttl ttl mode 400 khz ttl receiver propagation delay t dplh_ttl ttl mode, c l = 15pf, 0v v in +5v, figures 1, 2 100 ns t dphl_ttl 100 ttl receiver propagation delay skew (t dplh_ttl - t dphl_ttl ) t hlskew_ ttl ttl mode, c l = 15pf, 0v v in +5v, figures 1, 2 0 52 ns max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 5 downloaded from: http:///
switching characteristics ( continued) (v cc = 5v10%, v l = 1.62v to v cc , t a = -40c to +125c unless otherwise noted. typical values are at v cc = 5v, v l = 3.3v, t a = +25 c.) (notes 2, 3) parameter symbol conditions min typ max units ttl receiver channel-to-channel skew |t cskew_ ttl | ttl mode, c l = 15pf, 0v v in +5v, figures 1, 2 0 11 ns digital input (di) maximum switching rate sr dz rxz only, di mode, spi = high 400 khz di propagation delay t dplh_dz rxz only, di mode, spi = high, c l = 15pf, 0v v in +24v, figures 1, 2 300 ns t dphl_dz 300 di receiver propagation delay skew |t dplh_dz - t dphl_dz | t rskew_dz rxz only, di mode, spi = high, c l = 15pf, 0v v in +24v, figures 1, 2 0 28 ns di maximum glitch duration for glitch rejection t gl rxz only, di mode, spi = high 80 ns di admitted pulse duration t pass rxz only, di mode, spi = high 300 ns receiver (rxy) (note 5) rs-422 maximum data rate dr max422 rs-422 mode 35 mbps rs-422 receiver propagation delay t dplh_422 rs-422 mode, c l = 15pf, v id = 3v, figures 1, 2 25 ns t dphl_422 25 ns rs-422 receiver propagation delay skew |t dplh_422 - t dphl_422 | t hl- skew_422 rs-422 mode, c l = 15pf, v id = 3v, figures 1, 2 0 5 ns rs-422 receiver channel-to-channel skew |t c- skew_422 | rs-422 mode, c l = 15pf, v id = 3v, figures 1, 2 0 8 ns ttl maximum switching rate sr ttl ttl mode 400 khz ttl receiver propagation delay t dplh_ttl ttl mode, c l = 15pf, 0v v in +5v, figures 1, 2 100 ns t dphl_ttl 100 ttl receiver propagation delay skew |t dplh_ttl - t dphl_ttl | t hlskew_ ttl ttl mode, c l = 15pf, 0v v in +5v, figures 1, 2 0 52 ns digital input (di) maximum switching rate sr dy di mode 400 khz di propagation delay t dplh_dy di mode, c l = 15pf, 0v v in +24v, figures 1, 2 300 ns t dphl_dy 300 max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 6 downloaded from: http:///
switching characteristics ( continued) (v cc = 5v10%, v l = 1.62v to v cc , t a = -40c to +125c unless otherwise noted. typical values are at v cc = 5v, v l = 3.3v, t a = +25 c.) (notes 2, 3) parameter symbol conditions min typ max units di receiver propagation delay skew |t dplh_dy - t dphl_dy | t rskew_dy di mode, c l = 15pf, 0v v in +24v, figures 1, 2 0 100 ns di maximum glitch duration for glitch rejection t gl di/ttly is high or low 80 ns di admitted pulse duration t pass di/ttly is high or low 300 ns receiver (di2, di3) (note 5) digital input (di) maximum switching rate sr di di mode 20 khz di propagation delay t dplh_di di mode, c l = 15pf, 0v v in +24v, figures 1, 2 5 s t dphl_di 5 di receiver propagation delay skew (t dplh_di - t dphl_di ) t rskew_di di mode, c l = 15pf 60 ns maximum glitch duration for glitch rejection t gl di mode, di/ttl_ is high or low 80 ns admitted pulse length t pass di mode, di/ttl_ is high or low 350 ns ttl maximum switching rate sr di_ttl ttl mode 20 khz ttl receiver propagation delay t dplh_dittl ttl mode, c l = 15pf, 0v v in +5v, figures 1, 2 5 s t dphl_dittl 5 ttl receiver propagation delay skew (t dplh_dittl - t dphl_dittl ) t hlskew_ dittl ttl mode, c l = 15pf, figures 1, 2 80 ns fault detection ( afault , bfault , zfault , d2fault/irq , d3fault /sdo) (note 5) differential fault propagation delay to _fault output active t dflh r fault = 5k, c fault = 15pf, rs-422 and dhtl modes, figures 1, 4 fltr = 0 18 s fltr = 1 1400 t dfhl fltr = 0 6 fltr = 1 1400 differential slew rate to avoid fault alarm output r fault = 5k, c fault = 15pf, fltr = 0, rs-422 and d-htl modes, figures 1, 4 1 v/s single ended propagation delay to _fault output active t seflh r fault = 5k, c fault = 15pf, all modes 1.4 ms t sefhl 1.4 max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 7 downloaded from: http:///
switching characteristics ( continued) (v cc = 5v10%, v l = 1.62v to v cc , t a = -40c to +125c unless otherwise noted. typical values are at v cc = 5v, v l = 3.3v, t a = +25 c.) (notes 2, 3) note 2: all devices are 100% production tested at t a = +25c. specifications over temperature are guaranteed by design. note 3: currents into the device are positive; all currents out the device are negative. all voltages are referenced to ground, unless otherwise noted. note 4: in pin-control mode, d3fault /sdo is open-drain. in spi mode, d3fault /sdo is a push-pull output. note 5: capacitive load includes test probe and fixture capacitance. parameter symbol conditions min typ max units spi timing (figure 5) sngl/clk clock period t ch+cl 80 ns sngl/clk pulse-width high t ch 25 ns sngl/clk pulse-width low t cl 25 ns hith/ cs fall to sngl/clk rise time t css 15 ns ttl/sdi hold time t dh 15 ns ttl/sdi setup time t ds 15 ns output data propagation delay t do c l = 10pf, sngl/ clk falling-edge to d3fault /sdo stable. v l 1.62v 32 ns v l 3.3v 28 d3fault /sdo rise and fall times t ft rising v l = 1.62v 24 ns v l = 3.3v 2 falling v l = 1.62v 11 v l = 3.3v 1 hith/ cs hold time t csh v l =1.62v or 3.3v 10 ns v l = 5.5v 5 hith/ cs pulse-width high t cspw v l = 1.62v or 3.3v 10 ns v l = 5.5v 5 max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 8 downloaded from: http:///
figure 1. receiver test circuit figure 2. receiver propagation delay v in v in inin v id c fault c l _o _fault rx r fault v l v in in c fault c l _o _fault rx r fault v l differential single-ended t plh t phl v id _o +3v to +24v -3v to -24v v l v ol 0v 0v rise/fall times 2ns v l 2 v l 2 t plh t phl v in _o +5v to +24v 0v v l v ol v ih v il rise/fall times 2ns v l 2 v l 2 differential single ended max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 9 test circuits and waveforms downloaded from: http:///
figure 3. fault detection timing figure 4. spi timing diagram _fault -3v to -24v t dflh t dfhl v id +3v to +24v v l v ol 0v v th_dfn v th_dfp v l 2 v l 2 hith/cs sngl/clk ttl/sdi d3fault/sdo t css t ds t dh t cl t ch t csh t do max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 10 test circuits and waveforms (continued) downloaded from: http:///
(v cc = 5v, v l = 3.3v, t a = +25c, unless otherwise noted.) 0 10 20 30 40 50 60 70 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 propagation delay (ns) temperature ( c) rs - 422 and ttl mode propagation delay vs. temperature rs - 422, t phl toc04 rs - 422, t plh ttl, t phl ttl, t plh 6 8 10 12 14 0.1 1 10 i cc (ma) data rate (mbps) supply current vs. data rate rxa and rxb switching, all other inputs are low toc01 d- htl mode rs - 422 mode 0 50 100 150 200 250 300 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 diy di mode propagation delay (ns) temperature ( c) rxy/rxz di mode propagation delay vs. temperature t phl toc07 t plh - 200 - 150 - 100 - 50 0 50 100 150 200 - 20 - 15 - 10 -5 0 5 10 15 20 v th (mv) common mode voltage (v) rs - 422 receiver differential threshold voltage vs. common mode voltage high toc02 low 0.0 0.5 1.0 1.5 2.0 2.5 3.0 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 diy di mode propagation delay (s) temperature ( c) di2/di3 di mode propagation delay vs. temperature toc08 t plh t phl - 1000 - 800 - 600 - 400 - 200 0 200 400 600 800 1000 0 5 10 15 20 25 v th (mv) common mode voltage (v) d- htl receiver differential threshold voltage vs. common mode voltage high toc03 low - 40 - 30 - 20 - 10 0 10 20 30 40 - 0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 di voltage (v) di input current (ma) di input current vs. input voltage toc09 0 10 20 30 40 50 60 70 80 90 100 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 propagation delay (ns) temperature ( c) d- htl mode propagation delay vs. temperature toc05 t plh t phl 0 10 20 30 40 50 60 70 80 90 100 - 40 - 25 - 10 5 20 35 50 65 80 95 110 125 propagation delay (ns) temperature ( c) se - htl mode propagation delay vs. temperature hith = gnd, t phl toc06 hith = gnd, t plh hith = vl, t plh hith = vl, t phl max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs maxim integrated 11 www.maximintegrated.com typical operating characteristics downloaded from: http:///
(v cc = 5v, v l = 3.3v, t a = +25c, unless otherwise noted.) low differential input fault a 200mv/div gnd afault 2v/div toc13 100s/div 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0 10 20 30 40 50 60 70 80 90 100 v ol (v) sink current (ma) receiver output voltage low vs. sink current toc10 v l = 3v v l = 5v 0 1 2 3 4 5 6 - 225 - 175 - 125 - 75 - 25 v oh (v) source current (ma) receiver output voltage high vs. source current v l = 3v toc11 v l = 5v 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0 5 10 15 20 25 v ol (v) sink current (ma) _fault output voltage vs. sink current _fault is asserted. toc12 rs - 422 mode common - mode voltage fault (high) ao 5v/div gnd afault 5v/div toc14 2ms/div v outn v inside v backup rs - 422 mode common mode voltage fault (low) ao 5v/div gnd afault 5v/div toc15 2ms/div max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs maxim integrated 12 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
pin name function 1 ao noninverting rs-422/htl/ttl receiver input a. 2 afault open-drain fault output for receiver a. afault asserts low during a fault condition on receiver a (rxa) . see the detecting faults section for more information. 3 d3fault / sdo receiver d3 open-drain fault output/spi serial data out.in pin mode (spi is low), d3fault /sdo asserts low during a fault condition on the d3 receiver. see the detecting faults section for more information. in spi mode (spi is high), d3fault /sdo is the spi serial data output and is in a push-pull conigura - tion. d3fault /sdo is high-impedance in spi mode with hith/ cs is high. 4 hith/ cs single-ended htl threshold select input/spi chip select. in pin mode (spi is low), hith/ cs sets the input thresholds for the single-ended htl signals. in this mode, drive hith/ cs high to enable the 12v (typ) thresholds or drive hith/ cs low to enable the 7v (typ) thresholds.in spi mode (spi is high), hith/ cs is the spi chip select input. 5 sngl/clk single-ended receiver input select/spi clock input. in pin mode (spi is low), sngl/clk selects the mode for the inputs of receivers a,b, and z. in this mode, drive sngl/clk high to enable the receivers for single-ended ttl or htl operation. drive sngl/clk low for differential (rs-422 or dhtl) operation. see the truth tables for more information. in spi mode (spi is high), sngl/clk is the spi clock input. 6 ttl/sdi ttl mode select input/spi serial data input. in pin mode (spi is low), enables ttl operation for receivers a, b, and z. in this mode, drive ttl/sdi high to enable ttl or rs-422 operation. drive ttl/sdi low to select dhtl or sehtl operation for those receivers. in spi mode (spi is high), ttl/sdi is the serial data input. max14890e tqfn 5mm x 5mm top view afault hith/cs sngl/clk ttl/sdi d2fault/irq ao spibfault zfault zoyfault di/ttly 1 2 lo3 4 5 6 7 di3 di/ttl3 di/ttl2di2 lo2 gnd d3fault/sdo v l 3 a b a b + v cc y z diy bo yo 8 z 16 15 14 13 12 11 10 9 17 18 19 20 21 22 23 24 26 25 27 28 29 30 31 32 *ep * exposed pad. connect to gnd. max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 13 pin coniguration pin description downloaded from: http:///
pin name function 7 d2fault / irq receiver d2 open-drain fault output/spi irq output. in pin mode (spi is low), d2fault / irq asserts low during a fault condition on the d2 receiver (rxd2). in spi mode (spi is high), d2fault / irq asserts low when a fault bit is set. see the serial spi control section for more information. 8 bo receiver b output. 9 b non-inverting rs-422/htl/ttl input for receiver b. 10 b inverting input for receiver b. b is only used when differential mode is enabled. 11 gnd ground 12 lo2 receiver di2 output. 13 di2 digital/ttl input for di2 receiver. 14 di/ttl2 digital input/ttl select input for di2 receiver. see the truth tables for more information. di/ttl2 has no function in spi mode (spi is high). 15 y inverting rs-422 input for receiver y. y is used only when differential mode is enabled. 16 diy digital/ttl/non-inverting rs-422 input for receiver y. 17 yo receiver y output. 18 di/ttly digital input/ttl/rs-422 select input for receiver y. see the truth tables for more information. di/ ttly has no function in spi mode (spi is high). 19 yfault open-drain fault output for receiver y. yfault asserts low during a fault condition on receiver y. see the fault conditions section for more information. 20 zfault open-drain fault output for receiver z. zfault asserts low during a fault condition on receiver z. see the fault conditions section for more information. 21 bfault open-drain fault output for receiver b. bfault asserts low during a fault condition on receiver b. see the fault conditions section for more information. 22 v l logic interface supply input. v cc must always be greater than or equal to v l . 23 spi serial/parallel select input. drive spi low to enable pin-mode operation. drive spi high to enable spi mode operation. 24 zo receiver z output. 25 z non-inverting rs-422/htl/ttl input for receiver z. 26 z inverting input for receiver z. z is only used when the receiver is conigured for differential mode. 27 v cc supply input. bypass v cc to ground through a 0.1f capacitor as close to the device as possible. v cc must always be greater than or equal to v l . 28 lo3 receiver d3 output. 29 di3 digital/ttl input for the d3 receiver. 30 di/ttl3 digital input/ttl select input for the d3 receiver. see the truth tables for more information. di/ttl3 has no function in spi mode (spi is high). 31 a inverting input for receiver a. a is used only when differential mode is enabled. 32 a non-inverting rs-422/htl/ttl input for receiver a. - ep exposed pad. connect ep to ground. not intended as the primary ground connection. max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 14 pin description (continued) downloaded from: http:///
table 1. rxa, rxb, rxz and rxy receiver settings (pin-control mode) inputs receiver operation sngl/clk ttl/sdi di/ttly rxa, rxb, rxz rxy l l l d-htl ttl l l h d-htl di l h l rs-422 rs-422 l h h rs-422 di h l l se-htl ttl h l h se-htl di h h l ttl ttl h h h ttl di table 2. rxd2 receiver settings (pin- control mode) table 3. rxd3 receiver input settings (pin-control mode) table 4. di mode receiver logic (rxy, rxd2, rxd3) diy, di2, di3 yo, lo2, lo3 _fault -40v < v in -18v l l -18v < v in < -15v l indeterminate -15v < v in < +6v l h +6v < v in < +8v indeterminate h +8v v in < +40v h h di/ttl2 rxd2 mode of operation l ttl h di di/ttl3 rxd3 mode of operation l ttl h di max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 15 truth tables downloaded from: http:///
table 6. se-htl mode receiver logic (rxa, rxb, rxz) hith input voltage (a, b, z) output state (ao, bo, zo) _fault fault condition l -40v < v in < -18v l l low input fault l -18v < v in < -15v l indeterminate indeterminate l -15v < v in < +6v l h no fault l +6v < v in < +8v indeterminate h no fault l +8v v in < +40v h h no fault h -40v < v in < -18v l l low input fault h -18v < v in < -15v l indeterminate indeterminate h -15v < v in < +11v l h no fault h +11v < v in < +13v indeterminate h no fault h +13v v in < +40v h h no fault table 5. single-ended ttl mode receiver logic input (a, b, z, diy, di2, di3) output (ao, bo zo, yo, lo2, lo3 ) _fault fault condition -40v < v in < -18v l l low input fault -18v < v in < -15v l indeterminate indeterminate -15v < v in < +0.8v l h no fault +0.8v < v in < +2.0v indeterminate h no fault +2.0v v in < +15v h h no fault +15v v in < +18v h indeterminate indeterminate +18v v in < +40v h l high input fault max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 16 downloaded from: http:///
table 7. d-htl mode receiver logic (rxa, rxb, rxz) differential input voltage single-ended input voltage (a, a , b, b , z, z ) output state (ao, bo, zo) _fault fault condition v id > +2v -10v < v se h h no fault +1.2v < v id < +2v h indeterminate indeterminate -0.9v v id +0.9v indeterminate l low differential input voltage fault -2v v id -1.2v l indeterminate indeterminate v id -2v l h no fault x -18v < v se < -15v valid* indeterminate single-ended voltage fault x -40v < v se < -18v valid* l single-ended voltage fault x = dont care * receiver operates normally, although thresholds may deviate from limits in electrical characteristics table x = dont care * receiver operates normally, although thresholds may deviate from limits in electrical characteristics table table 8. rs-422 mode receiver logic (rxa, rxb, rxz, rxy) differential input voltage single-ended input voltage (a, a , b, b , z, z , y, y ) output state (ao, bo, zo, yo) _fault fault condition v id > +0.45v -20v v se +20v h h no fault +0.27v < v id < +0.45v +0.45v h indeterminate indeterminate -0.2v v id +0.2v indeterminate l low differential input voltage fault -0.45v v id -0.27v l indeterminate indeterminate v id -0.45v l h no fault x -40v < v se < -18v valid* l single-ended voltage fault x -18v < v se < -15v valid* indeterminate single-ended indeterminate voltage x +15v < v se < +18v valid* indeterminate single-ended indeterminate voltage x +18v < v se < +40v valid* l single-ended voltage fault max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 17 downloaded from: http:///
detailed description the max14890e is an incremental encoder receiver containing four differential receivers and two single-ended receivers. all four differential receivers support rs-422 and ttl operation. three of these differential receivers can be configured for differential and single-ended htl operation. in rs-422 mode, these receivers feature a wide common mode input range of -20v to +20v making it resilient to common mode noise. the auxiliary iec 61131-2 type-1/type-3 24v digital inputs allow connection of proximity sensors. the digital inputs can be individually configured for ttl operation. all receiver input signals are fault protected to voltage shorts in the 40v range. per channel fault detection pro - vides warning of irregular conditions, like small differential signals, shorts, opens, over- and undervoltages. spi or pin-control mode selection the max14890e provides a selectable spi or pin inter - face to set the input thresholds and functionality of the receivers. drive spi high to use the spi interface. drive spi low to use the pin interface. spi mode allows for higher flexibility by allowing individual receiver configuration. see the serial spi control section for more information. ttl operation all 6 of the receivers can be configured for single-ended ttl operation. complimentary/unused inputs can be left uncon - nected in all single-ended modes like ttl, di, and se-htl. in pin-control mode, drive the ttl/sdi and sngl/clk inputs high to enable ttl operation on the rxa, rxb, and rxz receivers. to enable ttl operation on rxy receiver, set di/ttly low. to enable ttl operation on the rxd2 or rxd3 receivers, drive the di/ttl2 or di/ttl3 inputs low. see the truth tables section for more information. in spi mode, each receiver can be enabled for ttl opera - tion individually. set the associated _sngl and _ttl bits to enable ttl mode for each receiver. see the serial spi control section for more information. single-ended htl operation (se-htl) the rxa, rxb, and rxz receivers can be configured for single-ended htl operation. complimentary/unused inputs can be left unconnected in all single-ended modes (ttl, di, and se-htl). in pin-control mode, drive the ttl/sdi input low and the sngl/clk input high to enable se-htl mode on the rxa, rxb, and rxz receivers. in spi mode, each of the rxa, rxb, and rxz receivers can be individually enabled for se-htl functionality. see the serial spi control section for more information. differential htl (d-htl) operation the rxa, rxb, and rxz receivers can be configured for d-htl operation. input signals up to 40v can be accepted in d-htl mode. in pin-control mode, set the sngl/clk and ttl/sdi inputs low to enable d-htl functionality for the rxa, rxb, and rxz receivers. see the truth tables section for more information.in spi mode, each of the rxa, rxb, and rxz receivers can be individually enabled for d-htl functionality. see the serial spi control section for more information. rs-422 operation the rxa, rxb, rxz, and rxy receivers can be configured for rs-422 operation. these receivers include a wide common-mode input range (-20v to +20v) in this mode. in pin-control mode, set the sngl/clk input low and the ttl/sdi input high to enable rs-422 functionality for the rxa, rxb, rxz, and rxy receivers. see the truth tables section for more information. in spi mode, each receiver can be individually enabled for rs-422 functionality. see the serial spi control sec - tion for more information.equivalent input circuit in rs-422, ttl, se-htl, and d-htl modes, the inputs pins have the equivalent circuit shown in figure 5. when the rxa, rxb, rxz, and/or rxy inputs are configured for ttl mode and are open/not connected, the input is pulled up to 2.64v (typ), resulting in a logic high on the receiver output. rxd2 and rxd3 have high impedance inputs in ttl mode ( figure 6 ). leaving di2 or di3 unconnected in this mode will result in an unknown logic state on the receiver output . detecting faults signal integrity from the encoder is essential for reliable system operation. degraded signals could cause prob - lems ranging from simple miscounts to loss of position. the max14890e detects common rs-422/htl/ttl/di faults. these faults include low differential input signals, max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 18 downloaded from: http:///
open-wire, short-circuits and input voltages that are outside normal operating voltage ranges (below -18v and above +18v). see the truth tables for more information. detecting small differential signals in rs-422 and differential htl (d-htl) modes, the receivers detect small dc and ac signals. small dc sig - nals can occur due to open wires or shorts, both of which are explained in the following sections. small differential ac signals can result due to cable attenuation of long or inadequate cables, or due to poor wiring. detecting short circuit and open-circuit faults (rs-422 and d-htl operation) the max14890e receivers detect short circuits on the inputs in rs-422 and d-htl modes. when the a and a inputs are shorted together, the differential input voltage is 0v, generating a low differential input voltage fault ( figure 7 ). open-circuit detection is similar to detecting a short-circuit condition and relies on the differential termination resistor across the receiver inputs. when an input is open, the termination resistor pulls the non-inverting and inverting inputs to the same voltage, generating a fault condition. the _fault output asserts when either a short-circuit or open-circuit conditions is detected. thermal shutdown the max14890e enters thermal shutdown when the chip temperature rises to above 160c (typ). receiver outputs are undefined and the _fault outputs are off when the device is in thermal shutdown. serial spi control spi interface the max14890e can be configured and monitored through an spi interface. the spi interface allows for greater flex - ibility for independent receiver mode configuration. drive the spi input high to enable spi functionality. the afault , bfault , zfault , yfault and receiver out - puts (ao, bo, zo, yo, lo2 and lo3) are operational in spi mode. all configuration bits are 0 (default) when spi is pulled high, setting rxa, rxb, and rxz in d-htl mode, rxy in rs-422 mode, and rxd2 and rxd3 in ttl mode. after spi is pulled high, all d3fault /sdo data is 0s during the first spi cycle. the max14890e samples the ttl/sdi input on the rising edge of the sngl/clk signal, while d3fault /sdo is generated on the falling edge of the sngl/clk. the hith/ cs spi chip select input signal features a glitch filter that improves robustness against emi, requiring a longer setup time. the max14890e must receive at least 16 clock pulses on sngl/clk between the hith/ cs falling edge and the hith/ cs rising edge (spi command transfer). if less than 16 pulses are received, the device ignores the ttl/sdi data received. if more than 16 pulses are received, only the last 16 bits of data before hith/ cs rises are utilized. figure 8 shows a standard spi cycle. figure 7. short circuit detection normal operation short circuit a to a aa figure 5. equivalent input circuit for ttl, rs-422, se-htl and d-htl modes (rxa, rxb, rxz, rxy) figure 6. equivalent input circuit for rxd2 and rxd3 in ttl mode 72.5k ? 2.64v in max 1489 0 e in = a, a, b, b, z, z, diy, y 3.17m ? 1.65v in max14890e in = di2, di3 max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 19 downloaded from: http:///
the 16 bits of d3fault /sdo data generated by the max14890e depend on the previously received spi command. if more than 16 sngl/clk cycles are present during an spi cycle, d3fault /sdo will output the data received on ttl/sdi with a 16 bit latency, allowing for daisy-chain transfers. register functionality three command bits (cmd[2:0]) and 13 mode selection bits control the individual receiver input thresholds and output behavior on the max14890e in spi mode. table 10 shows the functionality of the cmd[2:0] bits. change coniguration with detailed fault readback command (cmd[2:0] = 101) write 101 to bits cmd[2:0] to enable configuring the indi - vidual receivers through the spi interface (figure 9). bit settings are equivalent to the hardware inputs, hith/ cs , ttl/sdi, sngl/clk, and di. see tables 11-14 for more information. the hith bit enables/disables the single-ended htl thresholds for all receivers set in htl mode. see the fault filtering section for more information on the fltr bit. the detailed fault readback consists of 16 d3fault / sdo bits. the adflt, bdflt, zdflt, ydflt bits are set when a differential fault error occurs for each receiver. the aflt, aflt , bflt, bflt , zflt, zflt , yflt, diyflt, d2lflt, d2hflt, d3lflt, d3hflt bits are set when a single-ended voltage fault occurs for each input. see table 15. table 10. spi command bit settings cmd2 cmd1 cmd0 changes configuration? function 1 0 1 yes change coniguration. new coniguration is set by bits di[13:0]. read detailed fault status is the next spi cycle. see the change coniguration with detailed fault readback command section for more information. 0 1 0 no read current fault output and receiver outputs in next spi cycle. see the fault and receiver status command section for more information. 1 1 1 no read current coniguration in next spi cycle. do not change coniguration. see the readback current receiver command section for more information. 000, 001, 011, 100,110 no read detailed fault status in next spi cycle. do not change coniguration. see the detailed fault readback section for more information. figure 8. standard spi cycle hith/cs sngl/clk ttl/sdi d3fault/sdo cmd2 cmd1 cmd0 di[12] di[11] di[10] di[9] di[8] di[7] di[6] di[5] di[4] di[3] di[2] di[1] di[0] x do[15] do[14] do[13] do[12] do[11] do[10] do[9] do[8] do[7] do[6] do[5] do[4] do[3] do[2] do[1] do[0] max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 20 downloaded from: http:///
figure 9. change configuration with detailed fault readback spi command spi command cycle spi follow-on cycle x = unknown/dont care hith/cs sngl/clk ttl/sdi d3fault/sdo 1 0 1 hith attl asngl bttl bsngl zttl zsngl zdi yttl ysngl d2di d3di fltr x x x x x x x x x x x x x x x x x hith/cs sngl/clk ttl/sdi d3fault/sdo x x x x x x x x x x x x x x x x x aflt aflt adflt bflt bflt bdflt zflt zflt zdflt yflt diyflt ydflt d2lflt d2hflt d3lflt d3hflt max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 21 downloaded from: http:///
fault and receiver status command (cmd[2:0] = 010) write 010 to bits cmd[2:0] to read the fault and receiver output status (figure 10). the fault and receiver status is latched at the high-to-low transition on hith/ cs of the following spi cycle and is output on that spi cycle. the _fault bits are set when a differential or single-ended fault occurs on a receiver. see the fault diagnostics section for more information. figure 10. current fault and receiver status readback spi command spi command cyclespi follow-on cycle x = dont care hith/cs sngl/clk ttl/sdi d3fault/sdo 0 1 0 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x hith/cs sngl/clk ttl/sdi d3fault/sdo x x x x x x x x x x x x x x x x x 0 1 0 0 afault bfault zfault yfault d2fault d3fault ao bo zo yo lo2 lo3 max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 22 downloaded from: http:///
readback current receiver command (cmd[2:0] = 111) write 111 to bits cmd[2:0] to read the current receiver configuration ( figure 11 ). see table 11 thru table 14 for more information.fault filtering in spi mode, the interrupt output ( d3fault / irq) asserts when a fault is detected on any receiver. d3fault/irq and the receivers _fault output assert 1ms (typ) after the fault is detected. the 1ms filter is always active for single-ended faults, but can be enabled or disabled for differential faults. set the global configuration filter bit, fltr, to 1 to enable the fault filter for differential (_dflt) faults. set fltr = 0 to disable the filter. d3fault/irq and _fault assert 10s (typ) after the fault is detected when the filter is disabled. figure 11. receiver configuration readback spi command spi command cyclespi follow-on cycle x = dont care hith/cs sngl/clk ttl/sdi d3fault/sdo 1 1 1 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x hith/cs sngl/clk ttl/sdi d3fault/sdo x x x x x x x x x x x x x x x x x 1 1 1 hith attl asngl bttl bsngl zttl zsngl zdi yttl ysngl d2di d3di fltr max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 23 downloaded from: http:///
fault diagnosticsin spi mode, the interrupt output ( d3fault / irq) and associated _fault output asserts when a fault is detect - ed on any receiver. _fault deasserts when the fault is removed, but d3fault/irq remains latched until the fault status is read through the spi interface. if the fault is not cleared, d3fault/irq deasserts after the spi read command, but the associated fault bit and _fault output remain asserted. applications information cable termination transmission line termination is required for rs-422, htl, and ttl high-speed signals on long cables. for rs-422 and ttl signal levels, 120 termination is com - monly used to match the characteristic impedance of the cable. for htl signals, 270/100pf ac-termination with a series rc can be applied to reduce power dissipation. figure 12 shows a sample circuit of a termination scheme to suit all of these operating modes. the 270 termination can be permanently left in for all operating modes. for high-speed rs-422 and ttl signals, the cable should be terminated by its characteristic impedance to reduce reflections. this can be done by switching in the parallel resistor in these modes using a beyond-the-rails switch like the max14777. table 12. spi mode rxz selection bits table 11. spi mode rxa, rxb selection bits table 13. spi mode rxy selection bits table 14. spi mode rxd2, rxd3 selection bits yttl ysngl rxy receiver operation 0 0 rs-422 0 1 di 1 0 rs-422 1 1 ttl _sngl _ttl rxa, rxb receiver operation 0 0 d-htl 0 1 rs-422 1 0 se-htl 1 1 ttl zttl zsngl zdi rxz receiver operation 0 0 0 d-htl 0 1 0 se-htl 1 0 0 rs-422 1 1 0 ttl x x 1 di d_di rxd2, rxd3 receiver operation 0 ttl 1 di x = dont care figure 12. sample termination scheme for htl, rs-422, and ttl modes in in out receiver 270 ? 216 ? max14777 max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 24 downloaded from: http:///
table 15. detailed fault readback bit status bit name description 15 aflt 0 = no fault asserted.1 = single-ended fault on a detected by the rxa receiver. 14 aflt 0 = no fault asserted. 1 = single-ended fault on a detected by the rxa receiver. 13 adflt 0 = no fault asserted. 1 = differential fault detected on rxa. 12 bflt 0 = no fault asserted.1 = single-ended fault on b detected by the rxb receiver. 11 bflt 0 = no fault asserted. 1 = single-ended fault on b detected by the rxb receiver. 10 bdflt 0 = no fault asserted. 1 = differential fault detected on rxb. 9 zflt 0 = no fault asserted.1 = single-ended fault on z detected by the rxz receiver. 8 zflt 0 = no fault asserted. 1 = single-ended fault on z detected by the rxz receiver. 7 zdflt 0 = no fault asserted. 1 = differential fault detected on rxz. 6 yflt 0 = no fault asserted.1 = single-ended fault on y detected by the rxy receiver. 5 diyflt 0 = no fault asserted. 1 = single-ended fault on diy detected by the rxy receiver. 4 ydflt 0 = no fault asserted. 1 = differential fault detected on rxy. 3 d2lflt 0 = no fault asserted. 1 = single-ended low-voltage fault on di2 detected by the rxd2 receiver. 2 d2hflt 0 = no fault asserted. 1 = single-ended high-voltage fault on di2 detected by the rxd2 receiver. only in ttl mode. 1 d3lflt 0 = no fault asserted. 1 = single-ended low-voltage fault on di3 detected by the rxd3 receiver. 0 d3hflt 0 = no fault asserted. 1 = single-ended high-voltage fault on di3 detected by the rxd3 receiver. only in ttl mode. max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 25 downloaded from: http:///
figure 13. encoder circuit with differential htl (d-htl) signals and di alarm signal a a rxa b rxb rxz v cc b proximity sensor proximity sensor encoder asic d-htl a d-htl b counter/ motor controller max14890 di/ttly = 1 ttl/sdi = 0 sngl/clk = 0 di/ttl3 = 1 di/ttl2 = 1 afault 270 ? 100pf 270 ? 100pf zz d-htl z 270 ? 100pf rxy diy di fault y rxd2 di2 rxd3 v l di3 5v 3.3v to 5v 5v bfault 5v zfault 5v yfault 5v ao bo zo yo lo2 lo3 max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 26 downloaded from: http:///
figure 14. encoder circuit with single-ended htl (se-htl) signals and di alarm signal a a rxa b rxb rxz v cc b proximity sensor proximity sensor encoder asic se-htl a se-htl b motor controller max14890 di/ttly = 1 ttl/sdi = 0 sngl/clk = 1 di/ttl3 = 1 di/ttl2 = 1 afault 270 ? 100pf 270 ? 100pf zz se_htl z 270 ? 100pf rxy diy di fault y rxd2 di2 rxd3 v l di3 5v 3.3v to 5v 5v bfault 5v zfault 5v yfault 5v ao bo zo yo lo2 lo3 do do max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 27 downloaded from: http:///
figure 15. encoder circuit with ttl signals and di alarm signal a a rxa b rxb rxz v cc b proximity sensor proximity sensor encoder asic ttl a ttl b motor controller max14890 di/ttly = 0 ttl/sdi = 1 sngl/clk = 1 di/ttl3 = 0 di/ttl2 = 0 afault zz ttl z rxy diy ttl alarm y rxd2 di2 rxd3 v l di3 5v 3.3v to 5v 5v bfault 5v zfault 5v yfault 5v ao bo zo yo lo2 lo3 ttl ttl 120 ? 120 ? 120 ? 120 ? max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 28 downloaded from: http:///
+denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. * ep = exposed pad. package type package code outline no. land pattern no. 32 tqfn-ep t3255+6 21-0140 90-0603 part temp range pin package max14890eatj+ -40c to +125c 32 tqfn-ep max14890eatj+t -40c to +125c 32 tqfn-ep aa ao afault rxa bb bo bfault rxb zz zo zfault rxz diy y yo yfault rxy di/ttly di2 lo2 rxd2 di/ttl2 di3 lo3 rxd3 2.5ma 2.5ma 2.5ma di/ttl3 2.5ma config/ monitor hith/cs ttl/sdi sngl/clk d2fault/irq d3fault/sdo spi v l v cc gnd max 14890 e max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs www.maximintegrated.com maxim integrated 29 chip information process: bicmos ordering information package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. functional diagram downloaded from: http:///
revision number revision date description pages changed 0 3/15 initial release maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max14890e incremental encoder interface for rs-422, htl, and ttl with digital inputs ? 2015 maxim integrated products, inc. 30 revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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