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| MC74AC257 MC74ACT257 Quad 2 Input Multiplexer with 3 State Outputs The MC74AC257/74ACT257 is a quad 2-input multiplexer with 3-state outputs. Four bits of data from two sources can be selected using a Common Data Select input. The four outputs present the selected data in true (noninverted) form. The outputs may be switched to a high impedance state by placing a logic HIGH on the common Output Enable (OE) input, allowing the outputs to interface directly with bus-oriented systems. * * * * Multiplexer Expansion by Tying Outputs Together Noninverting 3-State Outputs Outputs Source/Sink 24 mA ACT257 Has TTL Compatible Inputs VCC 16 OE 15 I0c 14 I1c 13 Zc 12 I0d 11 I1d 10 Zd 9 QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS N SUFFIX CASE 648-08 PLASTIC PIN NAMES S OE I0a-I0d I1a-I1d Za-Zd Common Data Select Input 3-State Output Enable Input Data Inputs from Source 0 Data Inputs from Source 1 3-State Multiplexer Outputs D SUFFIX CASE 751B-05 PLASTIC 1 S 2 I0a 3 I1a 4 Za 5 I0b 6 I1b 7 Zb 8 GND TRUTH TABLE Output Enable OE H L L L L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance LOGIC SYMBOL Select Input S X H H L L Data Inputs I0 X X X L H I1 X L H X X Outputs Z Z L H L H S Za Zb Zc Zd OE I0a I1a I0b I1b I0c I1c I0d I1d FACT DATA 5-1 MC74AC257 MC74ACT257 FUNCTIONAL DESCRIPTION The MC74AC257/74ACT257 is a quad 2-input multiplexer with 3-state outputs. It selects four bits of data from two sources under control of a Common Data Select input. When the Select input is LOW, the I0x inputs are selected and when Select is HIGH, the I1x inputs are selected. The data on the selected inputs appears at the outputs in true (noninverted) form. The device is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: Za = OE*(I1a*S+I0a*S) Zb = OE*(I1b*S+I0b*S) Zc = OE*(I1c*S+I0c*S) Zd = OE*(I1d*S+I0d*S) When the Output Enable input (OE) is HIGH, the outputs are forced to a high impedance state. If the outputs are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. Designers should ensure the Output Enable signals to 3-state devices whose outputs are tied together are designed so there is no overlap. LOGIC DIAGRAM OE I0a I1a I0b I1b I0c I1c I0d I1d S Za Zb Zc Zd Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. FACT DATA 5-2 MC74AC257 MC74ACT257 MAXIMUM RATINGS* Symbol VCC Vin Vout Iin Iout ICC Tstg Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Current, per Pin DC VCC or GND Current per Output Pin Storage Temperature Value -0.5 to +7.0 -0.5 to VCC +0.5 -0.5 to VCC +0.5 20 50 50 -65 to +150 Unit V V V mA mA mA C * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol VCC Vin, Vout Supply Voltage DC Input Voltage, Output Voltage (Ref. to GND) VCC @ 3.0 V tr, tf Input Rise and Fall Time (Note 1) AC Devices except Schmitt Inputs VCC @ 4.5 V VCC @ 5.5 V tr, tf TJ TA IOH IOL Input Rise and Fall Time (Note 2) ACT Devices except Schmitt Inputs Junction Temperature (PDIP) Operating Ambient Temperature Range Output Current -- High Output Current -- Low -40 25 VCC @ 4.5 V VCC @ 5.5 V Parameter AC ACT Min 2.0 4.5 0 150 40 25 10 ns/V 8.0 140 85 -24 24 C C mA mA ns/V Typ 5.0 5.0 Max 6.0 5.5 VCC V Unit V 1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times. 2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times. FACT DATA 5-3 MC74AC257 MC74ACT257 DC CHARACTERISTICS 74AC Symbol Parameter VCC (V) TA = +25C Typ VIH Minimum High Level Input Voltage 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 VOL Maximum Low Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 IIN IOZ Maximum Input Leakage Current Maximum 3-State Current Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 0.002 0.001 0.001 1.5 2.25 2.75 1.5 2.25 2.75 2.99 4.49 5.49 74AC TA = -40C to +85C Unit Conditions Guaranteed Limits 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.56 3.86 4.86 0.1 0.1 0.1 0.36 0.36 0.36 0.1 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.46 3.76 4.76 0.1 0.1 0.1 0.44 0.44 0.44 1.0 V VOUT = 0.1 V or VCC - 0.1 V VOUT = 0.1 V or VCC - 0.1 V IOUT = -50 A V *VIN = VIL or VIH -12 mA IOH -24 mA -24 mA IOUT = 50 A V *VIN = VIL or VIH 12 mA IOL 24 mA 24 mA VI = VCC, GND VI (OE) = VIL, VIH VI = VCC, GND VO = VCC, GND VOLD = 1.65 V Max VOHD = 3.85 V Min VIN = VCC or GND VIL Maximum Low Level Input Voltage V VOH Minimum High Level Output Voltage V V A 5.5 5.5 5.5 5.5 0.5 5.0 75 -75 A mA mA A IOLD IOHD ICC 8.0 80 * All outputs loaded; thresholds on input associated with output under test. Maximum test duration 2.0 ms, one output loaded at a time. Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC. FACT DATA 5-4 MC74AC257 MC74ACT257 AC CHARACTERISTICS (For Figures and Waveforms -- See Section 3) 74AC Symbol Parameter VCC* (V) Min tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Delay In to Zn Propagation Delay In to Zn Propagation Delay S to Zn Propagation Delay S to Zn Output Enable Time Output Enable Time Output Disable Time Output Disable Time 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 TA = +25C CL = 50 pF Typ 5.0 4.0 6.0 4.5 7.0 5.0 7.5 5.5 6.5 5.0 5.5 5.0 5.5 5.0 5.5 5.0 Max 8.5 6.0 8.5 6.0 10.5 7.5 10.5 7.5 9.5 7.5 9.0 8.5 10.0 9.0 9.0 8.0 74AC TA = -40C to +85C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.5 1.0 1.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 9.0 7.0 9.0 7.0 11.5 8.5 11.5 8.5 10.5 8.5 10.0 9.5 11.0 10.0 10.0 9.0 ns ns ns ns ns ns ns ns 3-5 3-5 3-6 3-6 3-7 3-8 3-7 3-8 Unit Fig. No. * Voltage Range 3.3 V is 3.3 V 0.3 V. Voltage Range 5.0 V is 5.0 V 0.5 V. FACT DATA 5-5 MC74AC257 MC74ACT257 DC CHARACTERISTICS 74ACT Symbol Parameter VCC (V) TA = +25C Typ VIH VIL VOH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Maximum Low Level Output Voltage 4.5 5.5 4.5 5.5 IIN ICCT IOZ Maximum Input Leakage Current Additional Max. ICC/Input Maximum 3-State Current Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 5.5 5.5 8.0 0.6 0.5 0.001 0.001 1.5 1.5 1.5 1.5 4.49 5.49 74ACT TA = -40C to +85C Unit Conditions Guaranteed Limits 2.0 2.0 0.8 0.8 4.4 5.4 3.86 4.86 0.1 0.1 0.36 0.36 0.1 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 1.0 1.5 5.0 75 -75 80 V V V VOUT = 0.1 V or VCC - 0.1 V VOUT = 0.1 V or VCC - 0.1 V IOUT = -50 A *VIN = VIL or VIH -24 mA IOH -24 mA IOUT = 50 A *VIN = VIL or VIH 24 mA IOL 24 mA VI = VCC, GND VI = VCC - 2.1 V VI (OE) = VIL, VIH VI = VCC, GND VO = VCC, GND VOLD = 1.65 V Max VOHD = 3.85 V Min VIN = VCC or GND V V V A mA A mA mA A IOLD IOHD ICC * All outputs loaded; thresholds on input associated with output under test. Maximum test duration 2.0 ms, one output loaded at a time. FACT DATA 5-6 MC74AC257 MC74ACT257 AC CHARACTERISTICS (For Figures and Waveforms -- See Section 3) 74ACT Symbol Parameter VCC* (V) Min tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Delay In to Zn Propagation Delay In to Zn Propagation Delay S to Zn Propagation Delay S to Zn Output Enable Time Output Enable Time Output Disable Time Output Disable Time 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 1.5 2.0 2.0 2.5 2.0 2.0 2.5 2.0 TA = +25C CL = 50 pF Typ 5.0 6.0 7.0 7.0 6.0 6.0 6.5 6.0 Max 7.0 7.5 9.5 10.5 8.0 8.0 9.0 7.5 74ACT TA = -40C to +85C CL = 50 pF Min 1.0 1.5 1.5 2.0 1.5 1.5 1.5 1.5 Max 7.5 8.5 10.5 11.5 9.0 9.0 10.0 8.5 ns ns ns ns ns ns ns ns 3-6 3-6 3-6 3-6 3-7 3-8 3-7 3-8 Unit Fig. No. * Voltage Range 5.0 V is 5.0 V 0.5 V. CAPACITANCE Symbol CIN CPD Input Capacitance Power Dissipation Capacitance Parameter Value Typ 4.5 50 Unit pF pF Test Conditions VCC = 5.0 V VCC = 5.0 V FACT DATA 5-7 MC74AC257 MC74ACT257 OUTLINE DIMENSIONS N SUFFIX PLASTIC DIP PACKAGE CASE 648-08 ISSUE R 9 -A- 16 B 1 8 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01 F S C L -T- H G D 16 PL SEATING PLANE K J TA M M 0.25 (0.010) M -A- D SUFFIX PLASTIC SOIC PACKAGE CASE 751B-05 ISSUE J 9 16 -B- 1 8 P 8 PL 0.25 (0.010) M B S G F NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019 K C -T- SEATING PLANE R X 45 _ M D 16 PL M J 0.25 (0.010) TB S A S DIM A B C D F G J K M P R Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different applications. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA/EUROPE: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1-800-441-2447 MFAX: RMFAX0@email.sps.mot.com -TOUCHTONE (602) 244-6609 INTERNET: http://Design-NET.com JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, Toshikatsu Otsuki, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-3521-8315 HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 FACT DATA 5-8 *MC74AC257/D* MC74AC257/D |
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