74als244a/74als244a1 octal buffer (3state) product specification ic05 data handbook 1991 feb 08 integrated circuits
philips semiconductors product specification 74als244a/74als244a-1 octal buffer (3-state) 2 1991 feb 08 8531277 01670 features ? octal bus interface ? 3-state buffer outputs sink 24ma and source 15ma ? the -1 version sinks 48ma description the 74als244a is an octal buffer that is ideal for driving bus lines or buffer memory address registers. the outputs are all capable of sinking 24ma and sourcing up to 15ma, producing very good capacitive drive characteristics. the device features two output enables, oe a and oe b, each controlling four of the 3-state outputs. the 74als244a-1 sinks 48 ma i ol if the v cc is limited to 5.0v 0.25v. type typical propagation delay typical supply current (total) 74als244a 4.5ns 17ma 74als244a-1 4.5ns 17ma pin configuration 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 v cc oe a ia0 yb0 ia1 yb1 ia2 yb2 ia3 yb3 gnd sf00227 oe b ya0 ib0 ya1 ib1 ya2 ib2 ya3 ib3 ordering information order code description commercial range v cc = 5v 10%, t amb = 0 c to +70 c drawing number 20-pin plastic dip 74als244an, 74als244a-1n sot146-1 20-pin plastic sol 74als244ad, 744als244a-1d sot163-1 20-pin plastic ssop type ii 74als244adb, 74ALS244A-1Db sot339-1 input and output loading and fan-out table pins description 74als (u.l.) high/low load value high/low ian, ibn data inputs 1.0/1.0 20 m a/0.1ma oe a, oe b output enable inputs (active-low) 1.0/1.0 20 m a/0.1ma yan, ybn data outputs 750/240 15ma/24ma yan, ybn data 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. logic symbol oea 1 sf00228 2 4 6 8 17 15 13 11 18 16 14 12 3 5 7 9 ia0 ia1 ia2 ia3 ib0 ib1 ib2 ib3 ya0 ya1 ya2 ya3 yb0 yb1 yb2 yb3 v cc = pin 20 gnd = pin 10 oeb 19 iec/ieee symbol 1 2d en1 en2 1 2 19 2 4 6 8 17 15 13 11 18 16 14 12 3 5 7 9 sf00229
philips semiconductors product specification 74als244a/74als244a-1 octal buffer (3-state) 1991 feb 08 3 logic diagram v cc = pin 20 ia0 sf00230 oe a ia3 ia2 ia1 2 4 6 8 1 ya0 ya1 ya2 ya3 18 16 14 12 ib0 ib1 ib2 ib3 oe b 17 15 13 11 19 3 5 7 9 yb0 yb1 yb2 yb3 gnd = pin 10 function table inputs outputs oe a ia oe b ib ya yb l l l l l l l h l h h h h x h x z z h = high voltage level l = low voltage level x = don't care z = high impedance aoffo state 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 versions 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 74als244a/74als244a-1 octal buffer (3-state) 1991 feb 08 4 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 i input current at maximum input voltage v cc = max, v i = 7.0v 0.1 ma i ih high-level input current v cc = max, v i = 2.7v 20 m a i il low-level input current v cc = max, v i = 0.4v 0.1 ma i ozh off-state output current, high-level voltage applied v cc = max, v i = 2.7v 20 m a i ozl off-state output current, low-level voltage applied v cc = max, v i = 0.4v 20 m a i o output current 3 v cc = max, v o = 2.25v 30 112 ma i cch 6.5 15 ma i cc supply current (total) i ccl v cc = max 19.5 24 ma i ccz 25 30 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. 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 in to yn waveform 1 1.5 1.5 10.0 10.0 ns t pzh t pzl output enable time to high or low level waveform 2 waveform 3 1.0 2.5 10.0 12.0 ns t phz t plz output disable time from high or low level waveform 2 waveform 3 2.5 2.5 10.0 12.0 ns
philips semiconductors product specification 74als244a/74als244a-1 octal buffer (3-state) 1991 feb 08 5 ac waveforms for all waveforms, v m = 1.3v. v m v m v m v m yn ian, ibn t plh t phl sf00231 waveform 1. propagation delay for non-inverting outputs v oh 0.3v v m v m v m yn t pzh t phz sf00233 oe n 0v waveform 2. 3-state output enable time to high level and output disable time from high level v ol +0.3v v m v m v m yn t pzl t plz sf00234 oe n 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 74als244a/74als2441 octal buffer (3state) 1991 feb 08 6 dip20: plastic dual in-line package; 20 leads (300 mil) sot146-1
philips semiconductors product specification 74als244a/74als2441 octal buffer (3state) 1991 feb 08 7 so20: plastic small outline package; 20 leads; body width 7.5 mm sot163-1
philips semiconductors product specification 74als244a/74als2441 octal buffer (3state) 1991 feb 08 8 ssop20: plastic shrink small outline package; 20 leads; body width 5.3 mm sot339-1
philips semiconductors product specification 74als244a/74als2441 octal buffer (3state) 1991 feb 08 9 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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