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data bulletin MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. pvt squelch tm ctcss encoder/decoder features applications private/clear capability on-chip tx audio pre/deemphasis alternative to standard ctcss party line powersave option mobile radios community repeaters telephone/radio interconnect systems 3333 hz ctcss tone detect 8-bit shift register and latches logic tx tone output v v v dd bias ss ptl private tx path rx path f f f f emph clk2 clk1 carrier notone output control ld5-ld0 reference hysteresis rx tone decoder output decode comparator input rx tone detect output clocks 3333hz xtal xtal rx tone input load/latch d5 or serial enable 1 d4 or serial enable 2 d3 or serial data input d2 or serial clock input d1 input d0 input rx/tx control private enable push-to-listen bias rx tx tx pvt clr f f f f f emph emph clk1 carrier clk2 tx audio input rx audio input filter output bias rx tx rx audio output tx audio output balanced modulator input 6db/octave -6db/octave filters the MX375 is a cmos lsi microcircuit which combines ctcss encode/decode operation with voice band frequency inversion. frequency inversion is achieved by modulating the input audio with a 3333 hz carrier frequency. higher voice band frequencies are translated downward, and lower frequencies upward, resulting in a mirror image voice transmission. pvt squelch ? combines ctcss with inverted speech to prevent users from understanding each others communications unless the transmissions are accompanied by the groups assigned tone. its net effect is to eliminate casual eavesdropping and give mobile radio users a certain degree of privacy at a minimal price. up to 38 pvt squelch user groups (one per ctcss tone) can share a single radio channel. with pvt squelch, competing businesses can share a radio channel without compromising communications security. device features: 1) serial or parallel tone programming capability (serial or parallel offered on MX375j, p & lh8), 2) the ability to operate under notone conditions, 3) on-chip tx and rx audio filtering, 4) pin-selectable private/clear operation, and 5) pre/deemphasis filters in the tx path, for optimal recovered audio quality. a low-cost 4 mhz crystal/clock and a single 5v supply are required for operation. the MX375 is available in the following package styles: 28-pin pdip (MX375p), 28-pin cdip (MX375j) 28-pin plcc (MX375lh8), and 24-pin plcc (MX375lh).
pvt squelch tm ctcss encoder/decoder 2 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. contents section page 1. block diagram ............................................................................................................... ................... 3 2. signal list ................................................................................................................. ........................ 4 3. external components ......................................................................................................... ............. 6 4. general description ......................................................................................................... ................ 7 4.1.1 pre- and de-emphasis ..................................................................................................... ..................................7 4.1.2 functions and outputs.................................................................................................... ...................................7 5. application ................................................................................................................. ...................... 8 5.1.1 ctcss programming ........................................................................................................ ................................8 6. performance specification................................................................................................... ........... 9 6.1 electrical performance ..................................................................................................... ......................... 9 6.2 timing information ......................................................................................................... .......................... 12 6.2.1 serial loading ........................................................................................................... ........................................12 6.2.2 parallel loading ......................................................................................................... .......................................13 6.3 packaging .................................................................................................................. .............................. 13 mx?com, inc. reserves the right to change specifications at any time and without notice.
pvt squelch tm ctcss encoder/decoder 3 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 1. block diagram 3333 hz ctcss tone detect 8-bit shift register and latches logic tx tone output v v v dd bias ss ptl private tx path rx path f f f f emph clk2 clk1 carrier notone output control ld5-ld0 reference hysteresis rx tone decoder output decode comparator input rx tone detect output clocks 3333hz xtal xtal rx tone input load/latch d5 or serial enable 1 d4 or serial enable 2 d3 or serial data input d2 or serial clock input d1 input d0 input rx/tx control private enable push-to-listen bias rx tx tx pvt clr f f f f f emph emph clk1 carrier clk2 tx audio input rx audio input filter output bias rx tx rx audio output tx audio output balanced modulator input 6db/octave -6db/octave filters figure 1: device block diagram
pvt squelch tm ctcss encoder/decoder 4 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 2. signal list pin no. name type description lh j,p,lh8 128 v dd power 5v supply pin. 2 1 xtal/clock input this is the input to the clock oscillator inverter. an external 4 mhz xtal or clock input should be applied to this pin. 32 xtal output this is the 4 mhz output of the clock oscillator inverter. 43 load/ latch input this input controls the eight input latches: rx/ tx , privateenable , and d0-d5, as detailed in table 5. alternatively, the rx/ tx and privateenable inputs can be addressed separately by setting the load/ latch and control inputs as shown in table 5. 1 m w pullup. 5-7 d4-d2 input programming inputs (serial mode only): these are the rx /tx tone programming and function inputs which enable the serial programming mode. with load/ latch at logic 0 serial data is loaded in the following sequence: d5, d4, d3, d2, d1, d0, rx/ tx , privateenable . when these 8 bits have been clocked in on the rising clock edge, data is latched by strobing the load/ latch input 0 - 1 - 0 (see figure 5). pin 5 (d4) = serial enable2 pin 6 (d3) = serial data input pin 7 (d2) = serial clock input 4-9 d5-d0 input parallel programming inputs: these are the rx/ tx tone programming and function inputs which select the ctcss tone (see table 4). for both serial and parallel modes: in rx, a notone program enables rx audio output and forces the rx tone decode output to a logic 0. in tx, a notone program generates a constant v bias -0.7v condition at the tx tone output pin. each input has a 1 m w pullup resistor. 810 rx tone decode output the gated output of the decode comparator. in rx, a logic 0 indicates a valid ctcss tone decode condition, or the presence of notone programming. a logic 0 enables the rx audio path. in tx, this output is held at logic 1. 9 11 decode comparator input the voltage level at this pin is compared internally with a fixed reference level. a greater input level compared to the reference will result in a logic 0 at the rx tone decode output. this input should be externally connected to the rx tone detect output via external integration components c10, r2, r3, and d1 (see figure 2). 10 12 rx tone detect output in rx, this pin outputs a logical 1 when a valid programmed ctcss tone is received at the rx tone input. this input should be externally connected to the decode comparator input via external integration components c10, r2, r3, and d1 (see figure 2). n/a 13 notone output this pin outputs a logic 0 when a notone ctcss code has been programmed in rx. it is typically used to enable carrier squelch circuits under notone rx conditions. 11 14 v ss power the negative supply pin (ground). 12 15 tx tone output output the buffered ctcss sinewave tone output appears on this pin. in tx mode, the tone frequency is selected by program code (see table 4); if notone is programmed, the output is at vbias-0.7v. in rx mode, the output goes open circuit. this is an emitter follower output with an internal 10 k w load.
pvt squelch tm ctcss encoder/decoder 5 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. pin no. name type description lh j,p,lh8 13 16 v bias this pin is set internally to v dd /2. it must be externally decoupled using a capacitor (c7) to v ss . see figure 2. 14 17 filter output output this is the output of the input audio bandpass filter. it must be a.c. coupled to the balanced modulator input via capacitor c4. see figure 2. 15 18 balanced modulator input input this is the input to the balanced modulator. must be a.c. coupled to the filter output via capacitor c4. see figure 2. 16 19 rx audio output output outputs the received audio from a buffered output stage and is held at v bias when in tx. 17 20 tx audio output output outputs the transmitted audio in tx. in rx, this pin is held at v bias . 18 21 rx audio input input the audio input for the rx mode. input signals should be ac coupled via external capacitor c6. see figure 2 19 22 tx audio input input this is the tx audio voice input. signals should be ac coupled via external capacitor c11. see figure 2 20 23 ptl input the press to listen function input. in rx mode, a logic 0 enables the rx audio output directly, overriding tone squelch but not intercepting a private conversation; in tx mode, a logic 0 reverses the phase of the tx tone output for squelch tail reduction (see table 5). 21 24 control this input, together with load/ latch , selects the operational mode of the rx/ tx and privateenable functions. see table 5 22 25 rx/ tx input this input selects the rx or tx mode (rx = 1, tx = 0). this can be loaded in serial or parallel modes as described in table 5 23 26 private enable this input selects either private or clear mode (clear = 1, private = 0), and can be loaded by serial or parallel modes as described in table 5. this input has an internal 1 m w pullup resistor. 24 27 rx tone input input this is the received audio input to the on-chip ctcss tone decoder. it should be a.c. coupled via capacitor c5. note: the MX375lh package is available in serial mode only. table 1: signal list
pvt squelch tm ctcss encoder/decoder 6 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 3. external components xtal load/ d5 d4 d3 d2 d1 d0 comp in detect notone v xtal latch rx decode rxtone rx/tx control txin rxin txout rxout balmod filter bias txtone priven ptl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 MX375j/p/lh8 load/latch ss ss dd dd v ctcss tone decode output notone v d5 d4 d3 d2 d1 d0 r1 x1 c1 c2 c3 c5 c6 c11 c12 c8 c9 c4 + +5v r3 r2 d1 c10 c7 c13 + bias ctcss tone output (tx) rx audio out tx audio out rx audio in tx audio in push to listen mode selection push to talk privacy enable ctcss tone in (rx) v figure 2: recommended external components r1 1m w 10% c6 0.1 m f 20% r2 560k w 10% c7 1.0 m f 20% r3 820k w 10% c8 0.1 m f 20% x1 note 1, 2 4mhz c9 0.1 m f 20% c1 1.0 m f 20% c10 0.1 m f 20% c2 33pf 20% c11 0.1 m f 20% c3 33pf 20% c12 0.1 m f 20% c4 0.1 m f 20% c13 0.001 m f 20% c5 0.1 m f 20% d1 small signal table 2: recommended external components recommended external components note: 1. for best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of v dd , peak to peak. tuning fork crystals generally cannot meet this requirement. to obtain crystal oscillator design assistance, consult your crystal manufacturer. 2. xtal - at cut, fundamental, parallel resonant 20pf load capacitance, 0.05% tolerance
pvt squelch tm ctcss encoder/decoder 7 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 4. general description 4.1.1 pre- and de-emphasis pre- and de-emphasis (6db/octave) filters are included on-chip in the transmit path, so that the use of this device will produce natural sounding audio (clear or private modes) when installed in modern radio communication transceivers, with or without existing audio processing circuitry. the recommended layout is shown in block form below. from receiver stages amplifier demodulator clear clear de-emphasis amplifier modulator to transmitter stages pre-emphasis band pass filter band pass filter band pass filter band pass filter de-emphasis pre-emphasis figure 3: transmit and receive paths 4.1.2 functions and outputs d0-d5 notone rx/tx private enable ptl rx tone detect rx tone decoder tone output tone phase tx path rx path path state tone tone 1 0 0 1 0 1 yes 0 open bias inv tx, tone tone 1 0 0 0 0 1 yes 180 open bias inv tx, tone rev notone 0 0 0 x 0 1 bias x open bias clr tx, notone tone 1 1 0 1 0 1 bias x bias bias x incompatible tone 1 1 0 0 0 1 bias x bias open clr incompatible tone 1 1 0 x 1 0 bias x bias open inv compatible notone 0 1 0 x x 0 bias x bias open clr rx, notone tone 1 0 1 1 0 1 yes 0 open bias clr tx, tone tone 1 0 1 0 0 1 yes 180 open bias clr tx, tone rev notone 0 0 1 x 0 1 bias x open bias clr tx, notone tone 1 1 1 1 0 1 bias x bias bias x incompatible tone 1 1 1 0 0 1 bias x bias open clr incompatible tone 1 1 1 x 1 0 bias x bias open clr compatible notone 0 1 1 x x 0 bias x bias open clr rx, notone table 3: functions and outputs note: 1. algebraic functions: rx path on = rx (ptl + rx tone decoder) clear path = notone + private enable + (ptl rx rx tone decoder) notone (d0 - d5) = 000011 carrier frequency = 3333hz durin g inverted path (tx or rx) 2. the pre- and de-emphasis circuits remain in the transmit path in both the clear and invert modes. 3. power remains applied to the ctcss tone decoder at all times. 4. during clear operation the carrier frequency is turned off to reduce spurious emissions.
pvt squelch tm ctcss encoder/decoder 8 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 5. application 5.1.1 ctcss programming nominal frequency(hz) d f 0 (%) program inputs frequency(hz) d5 d4 d3 d2 d1 d0 67.0 67.05 +0.07 1 1 1 1 1 1 71.9 71.9 0 0 1 1 1 1 1 74.4 74.35 -0.07 1 1 1 1 1 0 77.0 76.96 -0.5 0 0 1 1 1 1 79.7 79.77 +0.09 1 1 1 1 0 1 82.5 82.59 +0.1 0 1 1 1 1 0 85.4 85.38 -0.2 1 1 1 1 0 0 88.5 88.61 +0.13 0 0 1 1 1 0 91.5 91.58 +0.09 1 1 1 0 1 1 94.8 94.76 -0.04 0 1 1 1 0 1 97.4 97.29 -0.11 1 1 1 0 1 0 100.0 99.96 -0.04 0 0 1 1 0 1 103.5 103.43 -0.07 0 1 1 1 0 0 107.2 107.15 -0.05 0 0 1 1 0 0 110.9 110.77 -0.12 0 1 1 0 1 1 114.8 114.64 -0.14 0 0 1 0 1 1 118.8 118.8 0 0 1 1 0 1 0 123.0 122.8 -0.17 0 0 1 0 1 0 127.3 127.08 -0.17 0 1 1 0 0 1 131.8 131.67 -0.10 0 0 1 0 0 1 136.5 136.61 +0.08 0 1 1 0 0 0 141.3 141.32 +0.02 0 0 1 0 0 0 146.2 146.37 +0.12 0 1 0 1 1 1 151.4 151.09 -0.2 0 0 0 1 1 1 156.7 156.88 +0.11 0 1 0 1 1 0 162.2 162.31 +0.07 0 0 0 1 1 0 167.9 168.14 +0.14 0 1 0 1 0 1 173.8 173.48 -0.19 0 0 0 1 0 1 179.9 180.15 +0.14 0 1 0 1 0 0 186.2 186.29 +0.05 0 0 0 1 0 0 192.8 192.86 +0.03 0 1 0 0 1 1 203.5 203.65 +0.07 0 0 0 0 1 1 210.7 210.17 -0.25 0 1 0 0 1 0 218.1 218.58 +0.22 0 0 0 0 1 0 225.7 226.12 +0.18 0 1 0 0 0 1 233.6 234.19 +0.25 0 0 0 0 0 1 241.8 241.08 -0.30 0 1 0 0 0 0 250.3 250.28 -0.01 0 0 0 0 0 0 notone 110000 table 4: ctcss programming
pvt squelch tm ctcss encoder/decoder 9 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. (a) explanation of load/latch function in serial and parallel modes load configuration load/ latch result parallel 1 transparent, the data acts directly parallel 1 - 0 latches present data in parallel 0 no further changes except to allow serial mode selection serial (data loading) 0 no change while serial data train is loaded serial (data loaded) 0 - 1 - 0 loaded serial data is latched (b) explanation of control input load configuration load/ latch control rx/ tx , private enable parallel 0 0 latched parallel 1 0 transparent parallel x 1 transparent serial 0 - 1 - 0 0 serial load serial x 1 transparent table 5: load/ latch and control input function notes: 1. 0 - 1 - 0 is a strobe pulse as shown in figure 4 and figure 5. 2. x denotes any logical state. 6. performance specification 6.1 electrical performance absolute maximum ratings exceeding these maximum ratings can result in damage to the device. general min. typ. max. units supply voltage -0.3 7.0 v input voltage at any pin -0.3 (v dd + 0.3) v current v dd -30 30 ma v ss -30 30 ma any other pin -20 20 ma j / p / lh / lh8 packages total device dissipation at t amb 25c 800 mw derating above 25c 10 mw/c above 25c operating temperature -40 85 c storage temperature -55 125 c table 6: absolute maximum ratings
pvt squelch tm ctcss encoder/decoder 10 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. operating limits correct operation of the device outside these limits is not implied. notes min. typ. max. units supply (v dd -v ss ) 4.5 5.0 5.5 v operating temperature -40 85 c xtal/clock frequency 4.0 mhz table 7: operating limits operating characteristics for the following conditions unless otherwise specified: v dd = 5.0v, t amb = 25c, xtal = 4.0mhz, audio level )db ref. = 300mv rms , composite input signal = 0db, 1 khz tone in, -12db (6khz band limited) gaussian white noise with a -20db ctcss tone. notes min. typ. max units static values supply voltage 4.5 5.0 5.5 v supply current tx (private) 15.0 ma tx (operating) 12.0 ma rx (operating) 7.0 ma analog input impedance 0.5 m w analog output impedance 0.5 k w tone input impedance 0.5 m w input logic 1 3.5 v input logic 0 1.5 v output logic 1 (i=-0.1ma) 4.0 v output logic 0 (i=-0.1ma) 1.0 v dynamic values decoder input signal level 1,4 -20 db response time 1,4,6 250 ms deresponse time 1,4,6 250 ms selectivity 4 0.5 3.0 %f 0 encoder tone output level (775mv rms ref.) -3.0 0 3.0 db tone frequency accuracy -0.3 0.3 %f 0 tone harmonic distortion 2.0 5.0 % tone output load current 2 5.0 ma output level variation between tones 9 -1.0 1.0 db risetime (to 90% nominal level) (f 0 >100 hz) 5 15 ms (f 0 <100 hz) 5 45 ms
pvt squelch tm ctcss encoder/decoder 11 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. notes min. typ. max units rx clear total harmonic distortion 3 2 5 % output noise level 7 -43 db passband gain (300-3033hz) 3 -1 0 1 db passband ripple (300-3033hz) 3 3 db audio stopband attenuation (f in >3333hz) 8 -20 db (f in >3633hz) 8 -45 db (f in <250hz) -42 db rx invert total harmonic distortion 3,8 4 10 % baseband breakthrough 3 -40 db carrier breakthrough -40 db output noise level 7,8 -37 db passband ripple (300-3000hz) 3 - 4 db audio stopband attenuation (f in >3333hz) 8 -50 db (f in >3633hz) 8 -60 db (f in <250hz) -60 db tx clear total harmonic distortion 3 3 5 % output noise level 7 -43 db passband gain (300-3033hz) 3 0 db passband ripple (300-3033hz) 3 3 db audio stopband attenuation (f in >3333hz) 8 -20 db (f in >3633hz) 8 -45 db (f in <250hz) -42 db tx invert total harmonic distortion 3,8 4 10 % baseband breakthrough -40 db carrier breakthrough -40 db output noise level 7,8 -37 db passband ripple (300-3033hz) 3,8 4 db audio stopband attenuation (f in >3333hz) 8 -50 db (f in >3633hz) 8 -60 db (f in <250hz) 8 -60 db table 8: operating characteristics
pvt squelch tm ctcss encoder/decoder 12 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. operating characteristics notes: 1. these values are obtained using the external integrating components given in figure 2. 2. an emitter follower output 3. with an input signal of 1 khz @ 0db. 4. under composite signal test conditions. 5. any programmed tone with r l =600 w , c l =15pf, including any response to a phase reversal instruction. 6. f 0 > 100 hz, (for 100hz > f 0 > 67hz: t = [100/f 0 (hz)] x 250ms). 7. input ac short-circuit, audio path enabled. 8. due to frequency inversion, these figures reflect the difference from the ideal response. 9. reference 156.7 hz (mx175 and mx275). 6.2 timing information 6.2.1 serial loading min. typ. max. unit serial mode enable set up time (t sms ) 250 - - ns clock high pulse width (t pwh ) 250 - - ns clock low pulse width (t pwl ) 250 - - ns data set up time (t ds ) 150 - - ns data hold time (t dh )50--ns load/latch set up time (t ll ) 250 - - ns load/latch pulse width (t llw ) 150 - - ns table 9: serial loading timing information serial mode enable serial clock serial data input load/latch d4 d5 t t t t t t t sms pwh dh ds pwl ll llw figure 4: serial loading timing
pvt squelch tm ctcss encoder/decoder 13 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. 6.2.2 parallel loading min. typ. max. unit data valid time (t vp ) 200 ns load time (t l ) 150 ns fall time (t f )50ns data hold time (t h )50 ns table 10: parallel loading timing information t t t t f l vp h load data data latched data inputs d0 - d5 rx/tx private enable load/latch figure 5: parallel load timing 6.3 packaging package tolerances note : all dimensions in inches (mm.) angles are in degrees a b c d e h p f g typ. max. min. dim. k j w t y 0.435 (11.05) 0.435 (11.05) 0.051 (1.30) 0.009 (0.22) 6 30 0.409 (10.40) 0.409 (10.40) 0.146 (3.70) 0.417 (10.60) 0.417 (10.60) 0.049 (1.24) 0.006 (0.152) 0.250 (6.35) 0.250 (6.35) 0.023 (0.58) 0.047 (1.19) 0.022 (0.55) 0.018 (0.45) 0.380 (9.61) 0.380 (9.61) 0.128 (3.25) 0.048 (1.22) 45 f g p a d b e pin 1 w c j k y w h t figure 6: 24-pin plcc mechanical outline: order as part no. MX375lh
pvt squelch tm ctcss encoder/decoder 14 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. a b c d e max. min. dim. f j g h .045x45 .453 (11.51) .050 (1.27) .165 (4.20) .026 (0.66) .070 (1.78) .017 (0.43) .410 (10.41) .450 (11.43) .485 (12.32) note : all dimensions in inches (mm.) angles are in degrees package tolerances f e g d a pin 1 b c h j .495 (12.57) typical .180 (4.57) .030 (0.76) .021 (0.53) .430 (10.92) typical .085 (2.16) figure 7: 28-pin plcc mechanical outline: order as part no. MX375lh8 note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e e1 h typ. max. min. dim. j j1 p y t k l 0.220 (5.59) 0.555 (14.04) 0.670 (17.02) 7 0.160 (4.05) 1.47 (37.20) 0.160 (4.05) 0.100 (2.54) 0.125 (3.16) 0.600 (15.24) 0.590 (14.99) 0.625 (15.88) 0.015 (0.38) 0.045 (1.14) 0.010 (0.25) 0.013 (0.33) 0.021 (0.53) 0.060 (1.52) 0.066 (1.67) 0.074 (1.88) 1.440 (36.44) 0.530 (13.41) b a pin1 t e e1 y j1 p c h k l j figure 8: 28-pin pdip mechanical outline: order as part no. MX375p
pvt squelch tm ctcss encoder/decoder 15 MX375 ? 1997 mx com inc. www. mxcom.com tele: 800 638-5577 910 744-5050 fax: 910 744-5054 doc. # 20480026.007 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective co mpanies. e e1 t b a pin1 h k l f j1 j c k1 p note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e e1 f h typ. max. min. dim. j j1 p t k1 k l 0.230 (5.84) 0.530 (13.45) 0.715 (18.14) 0.171 (4.34) 1.460 (37.08) 0.165 (4.19) 0.100 (2.54) 0.115 (2.92) 0.640 (16.26) 0.608 (15.43) 0.618 (15.70) 1.300 (33.02) 0.015 (0.38) 0.0102 (0.259) 0.018 (0.46) 0.050 (1.27) 0.075 (1.91) 0.080 (2.03) 0.080 (2.03) 1.440 (36.58) 0.510 (12.94) 0.050 (1.27) 0.055 (1.39) 0.0090 (0.228) figure 9: 28-pin cdip mechanical outline: order as part no. MX375j

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