1 data sheet acquired from harris semiconductor schs248a features ? ac257, act257. . . . . . . . . . . . . non-inverting outputs ? cd74act258 . . . . . . . . . . . . . . . . . . . inverting outputs ? buffered inputs ? typical propagation delay - 4.4ns at v cc = 5v, t a = 25 o c, c l = 50pf ? exceeds 2kv esd protection mil-std-883, method 3015 ? scr-latchup-resistant cmos process and circuit design ? speed of bipolar fast?/as/s with signi?cantly reduced power consumption ? balanced propagation delays ? ac types feature 1.5v to 5.5v operation and balanced noise immunity at 30% of the supply ? 24ma output drive current - fanout to 15 fast? ics drives 50 w transmission lines pinout cd54ac257, cd54act257 (cerdip) cd74ac257, cd74act257, cd74act258 (pdip, soic) top view description the ac257, act257 and cd74act258 are quad 2-input multiplexers with three-state outputs that utilize advanced cmos logic technology. each of these devices selects four bits of data from two sources under the control of a common select input (s). the output enable ( oe) is active low. when oe is high, all of the outputs (y or y) are in the high- impedance state regardless of all other input conditions. moving data from two groups of registers to four common output buses is a common use of the ac257, act257, and cd74act258. the state of the select input determines the particular register from which the data comes. the ac257, act257 and cd74act258 can also be used as function generators. 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 s 1i 0 1i 1 1y 2i 0 2i 1 gnd 2y v cc 4i 0 4i 1 4y 3i 0 3i 1 3y oe ac/act257 act258 act258 ac/act257 v cc 4i 0 4i 1 4y 3i 0 3i 1 3y oe s 1i 0 1i 1 1y 2i 0 2i 1 gnd 2y ordering information part number temp. range ( o c) package CD54AC257F3A -55 to 125 16 ld cerdip cd74ac257e 0 to 70 o c, -40 to 85, -55 to 125 16 ld pdip cd74ac257m 0 to 70 o c, -40 to 85, -55 to 125 16 ld soic cd54act257f3a -55 to 125 16 ld cerdip cd74act257e 0 to 70 o c, -40 to 85, -55 to 125 16 ld pdip cd74act257m 0 to 70 o c, -40 to 85, -55 to 125 16 ld soic cd74act258e 0 to 70 o c, -40 to 85, -55 to 125 16 ld pdip cd74act258m 0 to 70 o c, -40 to 85, -55 to 125 16 ld soic notes: 1. when ordering, use the entire part number. add the suffix 96 to obtain the variant in the tape and reel. 2. wafer and die for this part number is available which meets all electrical specifications. please contact your local ti sales office or customer service for ordering information. august 1998 - revised may 2000 caution: these devices are sensitive to electrostatic discharge. users should follow proper ic handling procedures. fast? is a trademark of fairchild semiconductor. copyright ? 2000, texas instruments incorporated cd54/74ac257, cd54/74act257, cd74act258 quad 2-input multiplexer with three-state outputs
2 functional diagram truth table output enable select input data inputs 257 outputs 258 outputs oe s i 0 i 1 y y hxxxzz lllxlh l lhxhl lhxllh lhxhhl h = high level voltage, l = low level voltage, z = high impedance (off) state, x = dont care 2 5 11 14 6 13 10 3 4 7 12 9 4y 3y 2y 1y 1y 4y 3y 2y ac/act 257 ac/act 258 1i 0 2i 0 3i 0 4i 0 1i 1 2i 1 3i 1 4i 1 s oe 115 cd54/74ac257, cd54/74act257, cd74act258
3 absolute maximum ratings thermal information dc supply voltage, v cc . . . . . . . . . . . . . . . . . . . . . . . . -0.5v to 6v dc input diode current, i ik for v i < -0.5v or v i > v cc + 0.5v . . . . . . . . . . . . . . . . . . . . . . 20ma dc output diode current, i ok for v o < -0.5v or v o > v cc + 0.5v . . . . . . . . . . . . . . . . . . . . 50ma dc output source or sink current per output pin, i o for v o > -0.5v or v o < v cc + 0.5v . . . . . . . . . . . . . . . . . . . . 50ma dc v cc or ground current, i cc or i gnd (note 3) . . . . . . . . . 100ma operating conditions temperature range, t a . . . . . . . . . . . . . . . . . . . . . . -55 o c to 125 o c supply voltage range, v cc (note 4) ac types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5v to 5.5v act types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5v to 5.5v dc input or output voltage, v i , v o . . . . . . . . . . . . . . . . . 0v to v cc input rise and fall slew rate, dt/dv ac types, 1.5v to 3v . . . . . . . . . . . . . . . . . . . . . . . . . 50ns (max) ac types, 3.6v to 5.5v . . . . . . . . . . . . . . . . . . . . . . . . 20ns (max) act types, 4.5v to 5.5v. . . . . . . . . . . . . . . . . . . . . . . 10ns (max) thermal resistance (typical, note 5) q ja ( o c/w) pdip package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ___ soic package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ___ maximum junction temperature (plastic package) . . . . . . . . . . 150 o c maximum storage temperature range . . . . . . . . . .-65 o c to 150 o c maximum lead temperature (soldering 10s) . . . . . . . . . . . . . 300 o c caution: stresses above those listed in absolute maximum ratings may cause permanent damage to the device. this is a stress only rating and operatio n of the device at these or any other conditions above those indicated in the operational sections of this speci?cation is not im plied. notes: 3. for up to 4 outputs per device, add 25ma for each additional output. 4. unless otherwise specified, all voltages are referenced to ground. 5. q ja is measured with the component mounted on an evaluation pc board in free air. dc electrical speci?cations parameter symbol test conditions v cc (v) 25 o c -40 o c to 85 o c -55 o c to 125 o c units v i (v) i o (ma) min max min max min max ac types high level input voltage v ih - - 1.5 1.2 - 1.2 - 1.2 - v 3 2.1 - 2.1 - 2.1 - v 5.5 3.85 - 3.85 - 3.85 - v low level input voltage v il - - 1.5 - 0.3 - 0.3 - 0.3 v 3 - 0.9 - 0.9 - 0.9 v 5.5 - 1.65 - 1.65 - 1.65 v high level output voltage v oh v ih or v il -0.05 1.5 1.4 - 1.4 - 1.4 - v -0.05 3 2.9 - 2.9 - 2.9 - v -0.05 4.5 4.4 - 4.4 - 4.4 - v -4 3 2.58 - 2.48 - 2.4 - v -24 4.5 3.94 - 3.8 - 3.7 - v -75 (note 6, 7) 5.5 - - 3.85 - - - v -50 (note 6, 7) 5.5---- 3.85 - v cd54/74ac257, cd54/74act257, cd74act258
4 low level output voltage v ol v ih or v il 0.05 1.5 - 0.1 - 0.1 - 0.1 v 0.05 3 - 0.1 - 0.1 - 0.1 v 0.05 4.5 - 0.1 - 0.1 - 0.1 v 12 3 - 0.36 - 0.44 - 0.5 v 24 4.5 - 0.36 - 0.44 - 0.5 v 75 (note 6, 7) 5.5 - - - 1.65 - - v 50 (note 6, 7) 5.5----- 1.65 v input leakage current i i v cc or gnd - 5.5 - 0.1 - 1- 1 m a three-state leakage current i oz v ih or v il v o =v cc or gnd - 5.5 - 0.5 - 5- 10 m a quiescent supply current msi i cc v cc or gnd 0 5.5 - 8 - 80 - 160 m a act types high level input voltage v ih - - 4.5 to 5.5 2-2-2- v low level input voltage v il - - 4.5 to 5.5 - 0.8 - 0.8 - 0.8 v high level output voltage v oh v ih or v il -0.05 4.5 4.4 - 4.4 - 4.4 - v -24 4.5 3.94 - 3.8 - 3.7 - v -75 (note 6, 7) 5.5 - - 3.85 - - - v -50 (note 6, 7) 5.5---- 3.85 - v low level output voltage v ol v ih or v il 0.05 4.5 - 0.1 - 0.1 - 0.1 v 24 4.5 - 0.36 - 0.44 - 0.5 v 75 (note 6, 7) 5.5 - - - 1.65 - - v 50 (note 6, 7) 5.5----- 1.65 v input leakage current i i v cc or gnd - 5.5 - 0.1 - 1- 1 m a three-state or leakage current i oz v ih or v il v o =v cc or gnd - 5.5 - 0.5 - 5- 10 m a quiescent supply current msi i cc v cc or gnd 0 5.5 - 8 - 80 - 160 m a additional supply current per input pin ttl inputs high 1 unit load d i cc v cc -2.1 - 4.5 to 5.5 - 2.4 - 2.8 - 3 ma notes: 6. test one output at a time for a 1-second maximum duration. measurement is made by forcing current and measuring voltage to minimize power dissipation. 7. test verifies a minimum 50 w transmission-line-drive capability at 85 o c, 75 w at 125 o c. dc electrical speci?cations (continued) parameter symbol test conditions v cc (v) 25 o c -40 o c to 85 o c -55 o c to 125 o c units v i (v) i o (ma) min max min max min max cd54/74ac257, cd54/74act257, cd74act258
5 act input load table input unit load data 0.83 s 1.27 oe 1.27 note: unit load is d i cc limit specified in dc electrical specifications table, e.g., 2.4ma max at 25 o c. switching speci?cations input t r , t f = 3ns, c l = 50pf (worst case) parameter symbol v cc (v) -40 o c to 85 o c -55 o c to 125 o c units min typ max min typ max ac types propagation delay, in to y ac/act257 t plh , t phl 1.5 - - 106 - - 117 ns 3.3 (note 9) 3.3 - 11.8 3.3 - 13 ns 5 (note 10) 2.4 - 8.5 2.3 - 9.3 ns propagation delay, s to y ac/act257 t plh , t phl 1.5 - - 153 - - 168 ns 3.3 4.8 - 17.1 4.7 - 18.8 ns 5 3.5 - 12.2 3.4 - 13.4 ns propagation delay, oe to y ac/act257 t plz , t phz , t pzl , t pzh 1.5 - - 167 - - 184 ns 3.3 5.3 - 18.7 5.2 - 20.6 ns 5 3.8 - 13.4 3.7 - 14.7 ns propagation delay, in to y ac/cd74act258 t plh , t phl 1.5 - - 91 - - 100 ns 3.3 2.9 - 10.2 2.8 - 11.2 ns 5 2.1 - 7.3 2 - 8 ns propagation delay, s to y ac/cd74act258 t plh , t phl 1.5 - - 153 - - 168 ns 3.3 4.8 - 17.1 4.7 - 18.8 ns 5 3.5 - 12.2 3.4 - 13.4 ns propagation delay, oe to y ac/cd74act258 t plz , t phz , t pzl , t pzh 1.5 - - 167 - - 184 ns 3.3 5.3 - 18.7 5.2 - 20.6 ns 5 3.8 - 13.4 3.7 - 14.7 ns three-state output capacitance c o - - -15- -15pf input capacitance c i - - -10- -10pf power dissipation capacitance c pd (note 11) - - 130 - - 130 - pf act types propagation delay, in to y ac/act257 t plh , t phl 5 (note 10) 2.8 - 9.7 2.7 - 10.7 ns propagation delay, s to y ac/act257 t plh , t phl 5 4 - 14 3.9 - 15.4 ns cd54/74ac257, cd54/74act257, cd74act258
6 propagation delay, oe to y ac/act257 t plz , t phz , t pzl , t pzh 5 4.1 - 14.6 4 - 16.1 ns propagation delay, in to y ac/cd74act258 t plh , t phl 5 2.4 - 8.5 2.3 - 9.3 ns propagation delay, s to y ac/cd74act258 t plh , t phl 5 4 - 14 3.9 - 15.4 ns propagation delay, oe to y ac/cd74act258 t plz , t phz , t pzl , t pzh 5 4.1 - 14.6 4 - 16.1 ns three-state output capacitance c o - - -15- -15pf input capacitance c i - - -10- -10pf power dissipation capacitance c pd (note 11) - - 130 - - 130 - pf notes: 8. limits tested 100%. 9. 3.3v min is at 3.6v, max is at 3v. 10. 5v min is at 5.5v, max is at 4.5v. 11. c pd is used to determine the dynamic power consumption per multiplexer. ac: p d = c pd v cc 2 f i + ? (c l v cc 2 f o ) act: p d =c pd v cc 2 f i + ? (c l v cc 2 f o )+v cc d i cc where f i = input frequency, f o = output frequency, c l = output load capacitance, v cc = supply voltage. figure 1. three-state propagation delay times and test circuit switching speci?cations input t r , t f = 3ns, c l = 50pf (worst case) (continued) parameter symbol v cc (v) -40 o c to 85 o c -55 o c to 125 o c units min typ max min typ max dut with three- state output input level 90% v s 10% gnd t f = 3ns t pzl t pzh t plz t phz outputs enabled outputs disabled output: low to off to low output: high to off to high other inputs (tied high or low) output disable c l 50pf 500 w ? r l 500 w ? r l out v s 0.2v cc v ol ( 1 gnd) v oh ( 1 v cc ) 0.8 v cc v s gnd (t phz, t pzh ) outputs enabled open (t phl, t plh ) 2 v cc (t plz, t pzl ) (open drain) t r = 3ns output disable ? for ac series only: when v cc = 1.5v, r l = 1k w cd54/74ac257, cd54/74act257, cd74act258
7 figure 2. inputs or select to output propagation delays (ac/act257) figure 3. select to output propagation delays (cd74act258) 90% 10% t f = 3ns t r = 3ns ni 0 , ni 1 , s t plh t phl v s y input level gnd v s input level v s s t plh t phl v s y dut output r l (note) output load 500 w c l 50pf note: for ac series only: when v cc = 1.5v, r l = 1k w. figure 4. propagation delay times ac act input level v cc 3v input switching voltage, v s 0.5 v cc 1.5v output switching voltage, v s 0.5 v cc 0.5 v cc cd54/74ac257, cd54/74act257, cd74act258
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. customers are responsible for their applications using ti components. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 2000, texas instruments incorporated
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