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| MC74AC251 MC74ACT251 8 Input Multiplexer with 3 State Outputs The MC74AC251/74ACT251 is a high-speed 8-input digital multiplexer. It provides, in one package, the ability to select one bit of data from up to eight sources. It can be used as a universal function generator to generate any logic function of four variables. Both true and complementary outputs are provided. * * * * * Multifunctional Capability On-Chip Select Logic Decoding Inverting and Noninverting 3-State Outputs Outputs Source/Sink 24 mA ACT251 Has TTL Compatible Inputs VCC 16 I4 15 I5 14 I6 13 I7 12 S0 11 S1 10 S2 9 N SUFFIX CASE 648-08 PLASTIC 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS 1 I3 2 I2 3 I1 4 I0 5 Z 6 Z 7 OE 8 GND D SUFFIX CASE 751B-05 PLASTIC PIN NAMES S0-S2 OE I0-I7 Z Z Select Inputs 3-State Output Enable Input Multiplexer Inputs 3-State Multiplexer Output Complementary 3-State Multiplexer Output LOGIC SYMBOL S0 OE I0 I1 I2 I3 I4 I5 I6 I7 S1 S2 Z Z TRUTH TABLE Inputs OE H L L L L L L L L S2 X L L L L H H H H S1 X L L H H L L H H S0 X L H L H L H L H Outputs Z Z I0 I1 I2 I3 I4 I5 I6 I7 Z Z I0 I1 I2 I3 I4 I5 I6 I7 H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance FACT DATA 5-1 MC74AC251 MC74ACT251 FUNCTIONAL DESCRIPTION This device is a logical implementation of a single-pole, 8-position switch with the switch position controlled by the state of three Select inputs, S0, S1, S2. Both true and complementary outputs are provided. The Output Enable input (OE) is active LOW. When it is activated, the logic function provided at the output is: Z = OE*(I0*S0*S1*S2+I1*S0*S1*S2+ I2*S0*S1*S2+I3*S0*S1*S2+ I4*S0*S1*S2+I5*S0*S1*S2+ I6*S0*S1*S2+I7*S0*S1*S2) When the Output Enable is HIGH, both outputs are in the high impedance (High Z) state. This feature allows multiplexer expansion by tying the outputs of up to 128 devices together. When the outputs of the 3-state devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. The Output Enable signals should be designed to ensure there is no overlap in the active-LOW portion of the enable voltages. LOGIC DIAGRAM I0 S2 S1 S0 OE I1 I2 I3 I4 I5 I6 I7 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Z Z FACT DATA 5-2 MC74AC251 MC74ACT251 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 MC74AC251 MC74ACT251 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 MC74AC251 MC74ACT251 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 Sn to Z or Z Propagation Delay Sn to Z or Z Propagation Delay In to Z or Z Propagation Delay In to Z or Z Output Enable Time OE to Z or Z Output Enable Time OE to Z or Z Output Disable Time OE to Z or Z Output Disable Time OE to Z or Z 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 11.5 8.5 11.0 8.0 10.0 7.0 9.0 6.5 7.5 5.5 7.5 5.5 8.5 7.0 7.0 5.5 Max 17.5 12.5 17.5 12.5 14.0 10.0 14.0 10.0 11.0 8.0 11.0 8.0 11.5 9.5 11.0 8.0 74AC TA = -40C to +85C CL = 50 pF Min 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 Max 19.0 13.5 19.0 13.5 15.5 11.0 15.5 11.0 12.0 9.0 12.0 9.0 13.0 10.0 12.0 8.5 ns ns ns ns ns ns ns ns 3-6 3-6 3-5 3-5 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 MC74AC251 MC74ACT251 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 MC74AC251 MC74ACT251 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 Sn to Z or Z Propagation Delay Sn to Z or Z Propagation Delay In to Z or Z Propagation Delay In to Z or Z Output Enable Time OE to Z or Z Output Enable Time OE to Z or Z Output Disable Time OE to Z or Z Output Disable Time OE to Z or Z 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 2.5 2.5 2.5 2.5 1.5 1.5 2.0 1.5 TA = +25C CL = 50 pF Typ 7.0 7.5 5.5 6.5 5.0 4.5 6.0 4.5 Max 15.5 16.5 12.0 12.5 8.5 8.5 12.0 8.5 74ACT TA = -40C to +85C CL = 50 pF Min 2.0 2.5 2.0 2.5 1.5 1.5 2.0 1.5 Max 17.0 18.5 13.0 14.0 9.0 9.5 13.0 9.0 ns ns ns ns ns ns ns ns 3-6 3-6 3-5 3-5 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 70 Unit pF pF Test Conditions VCC = 5.0 V VCC = 5.0 V FACT DATA 5-7 MC74AC251 MC74ACT251 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 *MC74AC251/D* MC74AC251/D |
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