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| 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. MC54/74F251 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS FASTTM 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 16 1 N SUFFIX PLASTIC CASE 648-08 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION CONNECTION DIAGRAM VCC 16 I4 15 I5 14 I6 13 I7 12 S0 11 S1 10 S2 9 MC54FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC LOGIC SYMBOL 9 10 11 1 I3 2 I2 3 I1 4 I0 5 Z 6 Z 7 OE 8 GND 6 S2 S1 S0 OE I0 I1 I2 I3 I4 I5 I6 I7 VCC = PIN 16 GND = PIN 8 7 4 3 2 1 15 14 13 12 5 FAST AND LS TTL DATA 4-117 MC54/74F251 FUNCTION 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 Z Z I0 I1 I2 I3 I4 I5 I6 I7 Outputs Z Z I0 I1 I2 I3 I4 I5 I6 I7 H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High Impedance LOGIC DIAGRAM I0 S2 S1 I1 I2 I3 I4 I5 I6 I7 S0 OE Z Z GUARANTEED OPERATING RANGES Symbol VCC TA Supply Voltage Operating Ambient Temperature Range Parameter 54, 74 54 74 IOH IOL Output Current -- High Output Current -- Low 54, 74 54, 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -3.0 24 mA mA Unit V C FAST AND LS TTL DATA 4-118 MC54/74F251 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 54, 74 74 VOL IOZH IOZL IIH Output LOW Voltage Output Off Current -- HIGH Output Off Current -- LOW Input HIGH Current 2.4 2.7 3.4 3.4 0.35 0.5 50 -50 20 100 IIL IOS ICC Input LOW Current Output Short Circuit Current (Note 2) Power Supply Current -60 15 16 -0.6 -150 22 24 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V A A A A mA mA mA Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage IIN = -18 mA IOH = -3.0 mA IOH = -3.0 mA IOL = 24 mA VOUT = 2.7 V VOUT = 0.5 V VIN = 2.7 V VIN = 7.0 V VIN = 0.5 V VOUT = 0 V In, Sn = 4.5 V OE = GND OE, In = 4.5 V VCC = MAX VCC = MAX VCC = MIN VCC = 4.50 V VCC = 4.75 V VCC = MIN VCC = MAX VCC = MAX VCC = MAX VCC = MAX VCC = MAX 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 54/74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Sn to Zn Propagation Delay Sn to Zn Propagation Delay In to Z Propagation Delay In to Z Output Enable Time OE to Z Output Disable Time OE to Z Output Enable Time OE to Z Output Disable Time OE to Z Min 4.0 3.2 4.5 4.5 3.0 1.5 4.0 3.0 3.0 3.0 3.0 2.0 4.0 3.5 3.0 2.0 Max 8.0 7.5 13 9.0 5.7 4.0 9.5 6.5 7.0 8.5 6.5 4.5 9.0 8.0 6.0 4.5 54F TA = -55 Cto +125C VCC = 5.0 V 10% CL = 50 pF Min 3.5 3.2 3.5 3.0 2.5 1.5 3.5 3.0 3.0 3.0 3.0 2.0 4.0 3.5 3.0 2.0 Max 9.5 9.5 16.5 10.5 8.0 6.0 11.5 7.5 9.5 10.5 8.5 8.0 10 10 7.0 8.0 74F TA = 0C to 70C VCC = 5.0 V 10% CL = 50 pF Min 4.0 3.2 4.5 4.0 3.0 1.5 4.0 3.0 3.0 3.0 3.0 2.0 4.0 3.5 3.0 2.0 Max 9.0 8.5 14 10.5 7.0 5.0 10.5 7.5 8.0 9.5 7.5 5.5 10 9.0 7.0 5.5 ns ns ns ns ns ns ns Unit ns FAST AND LS TTL DATA 4-119 |
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