MC54/74F251 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The MC54/74F251 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 assertion and negation outputs are provided. 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS FAST SCHOTTKY TTL • Multifunctional Capacity • On-Chip Select Logic Decoding • Inverting and Noninverting 3-State Outputs 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 assertion and negation 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. J SUFFIX CERAMIC CASE 620-09 16 1 N SUFFIX PLASTIC CASE 648-08 16 1 D SUFFIX SOIC CASE 751B-03 16 1 ORDERING INFORMATION MC54FXXXJ MC74FXXXN MC74FXXXD CONNECTION DIAGRAM VCC I4 I5 I6 I7 S0 S1 S2 16 15 14 13 12 11 10 9 Ceramic Plastic SOIC LOGIC SYMBOL 9 10 11 1 2 3 4 5 6 7 8 I3 I2 I1 I0 Z Z OE GND 6 5 S2 S1 S0 OE I0 I1 I2 I3 I4 I5 I6 I7 VCC = PIN 16 GND = PIN 8 FAST AND LS TTL DATA 4-117 7 4 3 2 1 15 14 13 12 MC54/74F251 FUNCTION TABLE Inputs Outputs OE S2 S1 S0 Z Z H X X X Z Z L L L L I0 I0 L L L H I1 I1 L L H L I2 I2 L L H H I3 I3 L H L L I4 I4 L H L H I5 I5 L H H L I6 I6 L H H H I7 I7 H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care Z = High Impedance LOGIC DIAGRAM I0 I1 I2 I3 I4 I5 I6 I7 S2 S1 S0 OE Z Z GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit 54, 74 4.5 5.0 5.5 V 54 -55 25 125 °C 74 0 25 VCC Supply Voltage TA Operating Ambient Temperature Range IOH Output Current — High 54, 74 –3.0 mA IOL Output Current — Low 54, 74 24 mA FAST AND LS TTL DATA 4-118 70 MC54/74F251 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter Min VIH Input HIGH Voltage 2.0 VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage Typ Max Unit Test Conditions V Guaranteed Input HIGH Voltage 0.8 V Guaranteed Input LOW Voltage –1.2 V IIN = –18 mA VCC = MIN 54, 74 2.4 3.4 V IOH = –3.0 mA VCC = 4.50 V 74 2.7 3.4 V IOH = –3.0 mA VCC = 4.75 V 0.5 V IOL = 24 mA VCC = MIN VOL Output LOW Voltage IOZH Output Off Current — HIGH 50 µA VOUT = 2.7 V VCC = MAX IOZL Output Off Current — LOW –50 µA VOUT = 0.5 V VCC = MAX IIH Input HIGH Current 20 µA VIN = 2.7 V VCC = MAX 100 µA VIN = 7.0 V –0.6 mA VIN = 0.5 V VCC = MAX –150 mA VOUT = 0 V VCC = MAX 22 mA In, Sn = 4.5 V OE = GND VCC = MAX OE, In = 4.5 V VCC = MAX IIL Input LOW Current IOS Output Short Circuit Current (Note 2) ICC Power Supply Current 0.35 –60 15 16 24 NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating ranges. 2. Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS Symbol Parameter 54/74F 54F 74F TA = +25°C TA = -55 °Cto +125°C TA = 0°C to 70°C VCC = +5.0 V VCC = 5.0 V ±10% VCC = 5.0 V ± 10% CL = 50 pF CL = 50 pF CL = 50 pF Min Max Min Max Min Max Unit ns tPLH Propagation Delay 4.0 8.0 3.5 9.5 4.0 9.0 tPHL Sn to Zn 3.2 7.5 3.2 9.5 3.2 8.5 tPLH Propagation Delay 4.5 13 3.5 16.5 4.5 14 tPHL Sn to Zn 4.5 9.0 3.0 10.5 4.0 10.5 tPLH Propagation Delay 3.0 5.7 2.5 8.0 3.0 7.0 tPHL In to Z 1.5 4.0 1.5 6.0 1.5 5.0 tPLH Propagation Delay 4.0 9.5 3.5 11.5 4.0 10.5 tPHL In to Z 3.0 6.5 3.0 7.5 3.0 7.5 tPZH Output Enable Time 3.0 7.0 3.0 9.5 3.0 8.0 tPZL OE to Z 3.0 8.5 3.0 10.5 3.0 9.5 tPHZ Output Disable Time 3.0 6.5 3.0 8.5 3.0 7.5 tPLZ OE to Z 2.0 4.5 2.0 8.0 2.0 5.5 tPZH Output Enable Time 4.0 9.0 4.0 10 4.0 10 tPZL OE to Z 3.5 8.0 3.5 10 3.5 9.0 tPHZ Output Disable Time 3.0 6.0 3.0 7.0 3.0 7.0 tPLZ OE to Z 2.0 4.5 2.0 8.0 2.0 5.5 FAST AND LS TTL DATA 4-119 ns ns ns ns ns ns ns