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tm 74abt245 octal bi-directional transceiver with 3-state outputs march 2007 ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 74abt245 octal bi-directional transceiver with 3-state outputs features bidirectional non-inverting buffers a and b output sink capability of 64ma, source capability of 32ma guaranteed output skew guaranteed multiple output switching specifications output switching specified for both 50pf and 250pf loads guaranteed simultaneous switching, noise level and dynamic threshold performance guaranteed latchup protection high-impedance, glitch-free bus loading during entire power up and power down cycle nondestructive, hot-insertion capability disable time is less than enable time to avoid bus contention general description the abt245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus- oriented applications. current sinking capability is 64 ma on both the a and b ports. the transmit/receive (t/r ) input determines the direction of data flow through the bidirectional transceiver. transmit (active high) enables data from a ports to b ports; receive (active low) enables data from b ports to a ports. the output enable input, when high, disables both a and b ports by plac- ing them in a high z condition. ordering information device also available in tape and reel. specify by appending suffix letter ??to the ordering number. pb-free package per jedec j-std-020b. note: 1. device available in tape and reel only. order number package number package description 74abt245csc m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74abt245csj m20d 20-lead small outline package (sop), eiaj type ii, 5.3mm wide 74abt245cmsa msa20 20-lead shrink small outline package (ssop), jedec mo-150, 5.3mm wide 74abt245cmtc mtc20 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide 74abt245cmtcx_nl (1) mtc20 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 2 connection diagram pin descriptions logic symbol truth table h = high voltage level l = low voltage level x = immaterial logic diagram pin names description oe output enable input (active low) t/r tr ansmit/receive input a 0 ? 7 side a inputs or 3-state outputs b 0 ? 7 side b inputs or 3-state outputs inputs output oe t/r l l bus b data to bus a l h bus a data to bus b h x high z state
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 3 absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. note: 2. either voltage limit or current limit is sufficient to protect inputs. recommended operating conditions the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. fairchild does not recommend exceeding them or designing to absolute maximum ratings. symbol parameter rating t stg storage temperature ?5? to +150? t a ambient temperature under bias ?5? to +125? t j j unction temperature under bias ?5? to +150? v cc v cc pin potential to ground pin ?.5v to +7.0v v in input voltage (2) ?.5v to +7.0v i in input current (2) ?0ma to +5.0ma v o v oltage applied to any output disabled or power-off state high state ?.5v to 5.5v ?.5v to v cc current applied to output in low state twice the rated i ol (ma) dc latchup source current ?00ma over voltage latchup (i/o) 10v symbol parameter rating t a f ree air ambient temperature ?0? to +85? v cc supply voltage +4.5v to +5.5v ? v / ? t minimum input edge rate data input enable input 50mv/ns 20mv/ns
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 4 dc electrical characteristics symbol parameter v cc conditions min. typ. max. units v ih input high voltage recognized high signal 2.0 v v il input low voltage recognized low signal 0.8 v v cd input clamp diode voltage min. i in = ?8 ma (oe , t/r ) 1.2 v v oh output high voltage min. i oh = ? ma (a n , b n ) 2.5 v min. i oh = ?2 ma (a n , b n ) 2.0 v ol output low voltage min. i ol = 64 ma (a n , b n ) 0.55 v i ih input high current max. v in = 2.7v (oe , t/r ) 1 a v in = v cc (oe , t/r )1 i bvi input high current breakdown t est max. v in = 7.0v (oe , t/r )7a i bvit input high current breakdown t est (i/o) max. v in = 5.5v (a n , b n ) 100 ? i il input low current max. v in = 0.5v (oe , t/r ) ? ? v in = 0.0v (oe , t/r )1 v id input leakage test 0.0 i id = 1.9 ? (oe , t/r ), all other pins grounded 4.75 v i ih + i ozh output leakage current 0?.5v v out = 2.7v (a n , b n ), oe = 2.0v 10 ? i il + i ozl output leakage current 0?.5v v out = 0.5v (a n , b n ), oe = 2.0v ?0 a i os output short-circuit current max. v out = 0.0v (a n , b n ) 100 ?75 ma i cex output high leakage current max. v out = v cc (a n , b n )50a i zz bus drainage test 0.0 v out = 5.5v (a n , b n ), all others gnd 100 ? i cch po w er supply current max. all outputs high 50 ? i ccl po w er supply current max. all outputs low 30 ma i ccz po w er supply current max. oe = v cc , t/r = gnd or v cc , all other gnd or v cc 50 ? i cct additional i cc /input outputs enabled max. v i = v cc ?2.1v 2.5 ma outputs 3-state oe , t/r v i = v cc ?2.1v 2.5 ma outputs 3-state data input v i = v cc ?2.1v, all others at v cc or gnd. 50 ? i ccd dynamic i cc no load max. outputs open, oe = gnd, t/r = gnd or v cc , one bit toggling, 50% duty cycle 0.1 ma/ mhz
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 5 dc electrical characteristics soic package. notes: 3. max number of outputs defined as (n). n-1 data inputs are driven 0v to 3v. one output at low. guaranteed, but not tested. 4. max number of data inputs (n) switching. n-1 inputs switching 0v to 3v. input-under-test switching: 3v to threshold (v ild ), 0v to threshold (v ihd ). guaranteed, but not tested. 5. max number of outputs defined as (n). n ?1 data inputs are driven 0v to 3v. one output high. guaranteed, but not tested. ac electrical characteristics soic and ssop package. symbol parameter v cc conditions c l = 50 pf, r l = 500 ? min. typ. max. units v olp quiet output maximum dynamic v ol 5.0 t a = 25? (3) 0.7 1.0 v v olv quiet output minimum dynamic v ol 5.0 t a = 25? (3) ?.3 ?.0 v v ohv minimum high level dynamic output voltage 5.0 t a = 25? (5) 2.7 3.1 v v ihd minimum high level dynamic input v oltage 5.0 t a = 25? (4) 2.0 1.7 v v ild maximum low level dynamic input v oltage 5.0 t a = 25? (4) 0.9 0.6 v symbol parameter t a = +25?, v cc = +5v, c l = 50pf t a = ?5? to +125?, v cc = 4.5v to 5.5v, c l = 50pf t a = ?0? to +85?, v cc = 4.5v to 5.5v, c l = 50pf units min. typ. max. min. max. min. max. t plh propagation delay, data to outputs 1.0 2.1 3.6 1.0 4.8 1.0 3.6 ns t phl 1.0 2.4 3.6 1.0 4.8 1.0 3.6 t pzh output enable time 1.5 3.2 6.0 1.0 6.7 1.5 6.0 ns t pzl 1.5 3.7 6.0 2.0 7.5 1.5 6.0 t phz output disable time 1.0 3.6 6.1 1.7 7.4 1.0 6.1 ns t plz 1.0 3.3 5.6 1.7 6.5 1.0 5.6
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 6 extended ac electrical characteristics soic package. notes: 6. this specification is guaranteed but not tested. the limits apply to propagation delays for all paths described switching in phase (i.e., all low-to-high, high-to-low, etc.). 7. this specification is guaranteed but not tested. the limits represent propagation delay with 250pf load capacitors in place of the 50pf load capacitors in the standard ac load. this specification pertains to single output switching only. 8. this specification is guaranteed but not tested. the limits represent propagation delays for all paths described switching in phase (i.e., all low-to-high, high-to-low, etc.) with 250pf load capacitors in place of the 50pf load capacitors in the standard ac load. 9. the 3-state delays are dominated by the rc network (500 ? , 250pf) on the output and have been excluded from the datasheet. symbol parameter t a = ?0? to +85?, v cc = 4.5v to 5.5v, c l = 50pf, 8 outputs switching (6) t a = ?0? to +85?, v cc = 4.5v to 5.5v, c l = 250pf, 1 output switching (7) t a = ?0? to +85?, v cc = 4.5v to 5.5v, c l = 250pf, 8 outputs switching (8) units min. typ. max. min. max. min. max. f t oggle max toggle f requency 100 mhz t plh propagation delay 1.5 5.0 1.5 6.0 2.5 8.5 ns t phl data to outputs 1.5 5.0 1.5 6.0 2.5 8.5 t pzh output enable time 1.5 6.5 2.5 7.5 2.5 9.5 ns t pzl 1.5 6.5 2.5 7.5 2.5 11.0 t phz output disable time 1.0 6.5 (9) (9) ns t plz 1.0 5.6
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 7 skew soic package. notes: 10. skew is defined as the absolute value of the difference between the actual propagation delays for any two separate outputs of the same device. the specification applies to any outputs switching high-to-low (t oshl ), low-to-high (t oslh ), or any combination switching low-to-high and/or high-to-low (t ost ). the specification is guaranteed but not tested. 11. propagation delay variation for a given set of conditions (i.e., temperature and v cc ) from device to device. this specification is guaranteed but not tested. 12. this specification is guaranteed but not tested. the limits apply to propagation delays for all paths described switching in phase (i.e., all low-to-high, high-to-low, etc.) 13. these specifications guaranteed but not tested. the limits represent propagation delays with 250pf load capacitors in place of the 50pf load capacitors in the standard ac load. 14. this describes the difference between the delay of the low-to-high and the high-to-low transition on the same pin. it is measured across all the outputs (drivers) on the same chip, the worst (largest delta) number is the guaranteed specification. this specification is guaranteed but not tested. capacitance note: 15. c i/o is measured at frequency f = 1 mhz, per mil-std-883, method 3012. symbol parameter t a = ?0? to +85?, v cc = 4.5v to 5.5v, c l = 50pf, 8 outputs switching (12) t a = ?0? to +85?, v cc = 4.5v to 5.5v, c l = 250pf, 8 outputs switching (13) units max. max. t oshl (10) pin to pin skew, hl transitions 1.3 2.3 ns t oslh (10) pin to pin skew, lh transitions 1.0 1.8 ns t ps (14) duty cycle, lh?l skew 2.0 3.5 ns t ost (10) pin to pin skew, lh/hl transitions 2.0 3.5 ns t pv (11) device to device skew, lh/hl transitions 2.0 3.5 ns symbol parameter conditions t a = 25? typ. units c in input capacitance v cc = 0v (oe , t/r ) 5.0 pf c i/o (15) i/o capacitance v cc = 5.0v (a n , b n ) 11.0 pf
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 8 ac loading *includes jig and probe capacitance figure 1. standard ac test load figure 2. test input signal levels figure 3. test input signal requirements ac wa veforms figure 4. propagation delay waveforms for inverting and non-inverting functions figure 5. propagation delay, pulse width waveforms figure 6. 3-state output high and low enable and disable times figure 7. setup time, hold time and recovery time waveforms amplitude rep. rate t w t r t f 3.0v 1mhz 500ns 2.5ns 2.5ns
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 9 physical dimensions dimensions are in inches (millimeters) unless otherwise noted. figure 8. 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide pa ck ag e number m20b
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 10 physical dimensions (continued) dimensions are in millimeters unless otherwise noted. figure 9. 20-lead small outline package (sop), eiaj type ii, 5.3mm wide pa ck ag e number m20d
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 11 physical dimensions (continued) dimensions are in millimeters unless otherwise noted. figure 10. 20-lead shrink small outline package (ssop), jedec mo-150, 5.3mm wide pa ck ag e number msa20
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 12 physical dimensions (continued) dimensions are in millimeters unless otherwise noted. figure 11. 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide pa ck ag e number mtc20
74abt245 octal bi-directional transceiver with 3-state outputs ?991 fairchild semiconductor corporation www.fairchildsemi.com 74abt245 rev. 1.4 13 tradem a rks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intend ed to be an exhaustive list of all such trademarks. acex across the board. around the world. activearray bottomless build it now coolfet crossvolt ctl current transfer logic dome e 2 cmos ecospark ensigna fact quiet series fact fast fastr fps frfet globaloptoisolator gto hisec i-lo implieddisconnect intellimax isoplanar microcoupler micropak microwire msx msxpro ocx ocxpro optologic optoplanar pacman pop power220 power247 poweredge powersaver powertrench programmable active droop qfet qs qt optoelectronics quiet series rapidconfigure rapidconnect scalarpump smart start spm stealth superfet supersot -3 supersot -6 supersot -8 syncfet tcm the power franchise tinyboost tinybuck tinylogic tinyopto tinypower tinywire trutranslation p serdes uhc unifet vcx wire disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. these specifications do not expand the terms of fairchild? worldwide terms and conditions, specifically the warranty therein, which covers these products. life support policy fairchild? products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems wh ich, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform w hen properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information formative or in design this datasheet contains the design specifications for product development. specifications may change in any manner without notice. preliminary first production this datasheet contains preliminary data; supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. no identification needed full production this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. obsolete not in production this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. re v. i24

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