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74als245a/74als245a1 octal transceiver (3state) product specification ic05 data handbook 1991 jun 03 integrated circuits
philips semiconductors product specification 74als245a/74als245a-1 octal transceiver (3-state) 2 1991 jun 03 8530011 02709 features ? octal bidirectional bus interface ? 3-state buffer outputs sink 24ma and source 15ma ? outputs are placed in high impedance state during power-off conditions ? the -1 version sinks 48ma description the 74als245a is an octal transceiver featuring non-inverting 3-state bus compatible outputs in both transmit and receive directions. the device features an output enable (oe ) input for easy cascading and transmit/receive (r/t ) input for direction control. the 74als245a-1 is the same as the 74als245a except that both ports sink 48ma within the 5% v cc range. type typical propagation delay typical supply current (total) 74als245a 7.0ns 34ma 74als245a-1 7.0ns 34ma pin configuration sf00198 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 t/r a0 a1 a2 a3 a4 a5 a6 a7 gnd v cc oe b0 b1 b2 b3 b4 b6 b5 b7 ordering information order code description commercial range v cc = 5v 10%, t amb = 0 c to +70 c drawing number 20-pin plastic dip 74als245an, 74als245a-1n sot146-1 20-pin plastic sol 74als245ad, 744als245a-1d sot163-1 20-pin plastic ssop type ii 74als245adb, 74ALS245A-1Db sot339-1 input and output loading and fan-out table pins description 74als (u.l.) high/low load value high/low a0 a7, b0 b7 data inputs 1.0/1.0 20 m a/0.1ma oe output enable input (active-low) 1.0/1.0 20 m a/0.1ma t/r transmit/receive input 1.0/1.0 20 m a/0.1ma a0 a7 a port outputs 750/240 15ma/24ma b0 b7 b port outputs 750/240 15ma/24ma a0 a7 a port outputs (-1 version) 750/480 15ma/48ma b0 b7 b port outputs (-1 version) 750/480 15ma/48ma note: one (1.0) als unit load is defined as: 20 m a in the high state and 0.1ma in the low state.
philips semiconductors product specification 74als245a/74als245a-1 octal transceiver (3-state) 1991 jun 03 3 logic symbol b2 b3 b4 b5 16 15 14 13 234 v cc = pin 20 gnd = pin 10 sf00199 b1 17 b0 18 19 1 oe t/r a0 a1 a2 a3 a4 a5 567 b6 b7 12 11 a6 a7 89 iec/ieee symbol sc00097 g3 19 3en1 [ba] 1 3en2 [ab] ? 1 2 ? 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 logic diagram sf00201 18 b0 17 b1 16 b2 15 b3 14 b4 13 b5 12 b6 11 b7 a0 a1 a2 a3 a4 a5 a6 a7 23456789 19 1 oe t/r v cc = pin 20 gnd = pin 10 function table inputs outputs oe t/r outputs l l bus b data to bus a l h bus a data to bus b h x z h = high voltage level l = low voltage level x = don't care z = high impedance aoffo state
philips semiconductors product specification 74als245a/74als245a-1 octal transceiver (3-state) 1991 jun 03 4 absolute maximum ratings (operation beyond the limit set forth in this table may impair the useful life of the device. unless otherwise noted these limits are over the operating free air temperature range.) symbol parameter rating unit v cc supply voltage 0.5 to +7.0 v v in input voltage 0.5 to +7.0 v i in input current 30 to +5 ma v out voltage applied to output in high output state 0.5 to v cc v i o current a pp lied to out p ut in low out p ut state all versions 48 ma i out c u rrent applied to o u tp u t in lo w o u tp u t state -1 version 96 ma t amb operating free-air temperature range 0 to +70 c t stg storage temperature range 65 to +150 c recommended operating conditions symbol parameter limits unit symbol parameter min nom max unit v cc supply voltage 4.5 5.0 5.5 v v ih high-level input voltage 2.0 v v il low-level input voltage 0.8 v i ik input clamp current 18 ma i oh high-level output current 15 ma i o low level out p ut current all versions 24 ma i ol lo w- le v el o u tp u t c u rrent -1 version 48 1 ma t amb operating free-air temperature range 0 +70 c notes: 1. the 48ma limit applies only under the condition of v cc = 5.0v 5%.
philips semiconductors product specification 74als245a/74als245a-1 octal transceiver (3-state) 1991 jun 03 5 dc electrical characteristics (over recommended operating free-air temperature range unless otherwise noted.) symbol parameter test conditions 1 limits unit symbol parameter test conditions 1 min typ 2 max unit v cc 10%, v il = max, i oh = 0.4ma v cc 2 v v oh high - level out p ut voltage cc , il , v ih = min i oh = 3ma 2.4 3.2 v v oh high level out ut voltage v cc = min, v il = max, v ih = min i oh = 15ma 2.0 v all versions v cc = min, v il = max, i ol = 12ma 0.25 0.40 v v ol low - level out p ut voltage all v ersions cc , il , v ih = min i ol = 24ma 0.35 0.50 v v ol low level out ut voltage -1 version v cc = 4.75v, v il = max, v ih = min i ol = 48ma 0.35 0.50 v v ik input clamp voltage v cc = min, i i = i ik 0.73 1.5 v i input current at maxi- oe or t/r v cc = max, v i = 7.0v 0.1 ma i i mum input voltage a or b ports v cc = max, v i = 5.5v 0.1 ma i ih high-level input current 3 v cc = max, v i = 2.7v 20 m a i il low-level input current 3 v cc = max, v i = 0.4v 0.1 ma i o output current 4 v cc = max, v o = 2.25v 30 112 ma i cch 28 45 ma i cc supply current (total) i ccl v cc = max 40 55 ma i ccz 44 58 ma notes: 1. for conditions shown as min or max, use the appropriate value specified under recommended operating conditions for the applic able type. 2. all typical values are at v cc = 5v, t amb = 25 c. 3. for i/o ports, the parameter i ih and i il include the off-state current. 4. the output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit outp ut current, i os . ac electrical characteristics limits symbol parameter test condition t amb = 0 c to +70 c v cc = +5.0v 10% c l = 50pf, r l = 500 w unit min max t plh t phl propagation delay an to bn, bn to an waveform 1 2.0 2.0 10.0 10.0 ns t pzh t pzl output enable time to high or low level waveform 2 waveform 3 3.0 3.0 20.0 20.0 ns t phz t plz output disable time from high or low level waveform 2 waveform 3 2.0 4.0 10.0 15.0 ns
philips semiconductors product specification 74als245a/74als245a-1 octal transceiver (3-state) 1991 jun 03 6 ac waveforms for all waveforms, v m = 1.3v. v m v m v m v m t phl t plh an, bn bn, an sc00096 waveform 1. propagation delay for non-inverting outputs v m v m v m t phz t pzh oe an, bn v oh -0.3v 0v sc00094 waveform 2. 3-state output enable time to high level and output disable time from high level v m v m v m t plz t pzl oe an, bn v ol +0.3v sc00095 3.5v waveform 3. 3-state output enable time to low level and output disable time from low level test circuit and waveforms t w 90% v m 10% 90% v m 10% 90% v m 10% 90% v m 10% negative pulse positive pulse t w amp (v) 0.3v 0.3v t thl ( t f f ) input pulse requirements rep.rate t w t tlh t thl 1mhz 500ns 2.0ns 2.0ns input pulse definition v cc family 74als d.u.t. pulse generator r l c l r t v in v out test circuit for 3-state outputs definitions: r l = load resistor; see ac electrical characteristics for value. c l = load capacitance includes jig and probe capacitance; see ac electrical characteristics for value. r t = termination resistance should be equal to z out of pulse generators. t thl ( t f ) t tlh ( t r ) t tlh ( t r ) amp (v) amplitude 3.5v 1.3v v m sc00072 r l 7.0v switch position test switch t plz , t pzl closed all other open
philips semiconductors product specification 74als245a/74als245a1 octal transceiver (3state) 1991 jun 03 7 dip20: plastic dual in-line package; 20 leads (300 mil) sot146-1
philips semiconductors product specification 74als245a/74als245a1 octal transceiver (3state) 1991 jun 03 8 so20: plastic small outline package; 20 leads; body width 7.5 mm sot163-1
philips semiconductors product specification 74als245a/74als245a1 octal transceiver (3state) 1991 jun 03 9 ssop20: plastic shrink small outline package; 20 leads; body width 5.3 mm sot339-1
philips semiconductors product specification 74als245a/74als245a1 octal transceiver (3state) 1991 jun 03 10 philips semiconductors and philips electronics north america corporation reserve the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performanc e. philips semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under a ny patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copy right, or mask work right infringement, unless otherwise specified. applications that are described herein for any of these products are for illustrative purposes only. philips semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. life support applications philips semiconductors and philips electronics north america corporation products are not designed for use in life support appl iances, devices, or systems where malfunction of a philips semiconductors and philips electronics north america corporation product can reasonab ly be expected to result in a personal injury. philips semiconductors and philips electronics north america corporation customers using or sel ling philips semiconductors and philips electronics north america corporation products for use in such applications do so at their own risk and agree to fully indemnify philips semiconductors and philips electronics north america corporation for any damages resulting from such improper use or sale. this data sheet contains preliminary data, and supplementary data will be published at a later date. philips semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. philips semiconductors 811 east arques avenue p.o. box 3409 sunnyvale, california 940883409 telephone 800-234-7381 definitions data sheet identification product status definition objective specification preliminary specification product specification formative or in design preproduction product full production this data sheet contains the design target or goal specifications for product development. specifications may change in any manner without notice. this data sheet contains final specifications. philips semiconductors reserves the right to make changes at any time without notice, in order to improve design and supply the best possible product. ? copyright philips electronics north america corporation 1997 all rights reserved. printed in u.s.a.

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