HD74HC253
HD74HC253 is Dual 4-to-1-line Data Selectors/Multiplexers (with 3-state outputs) manufactured by Hitachi Semiconductor.
Description
The large output drive and 3-state features of this device make it ideally suited for interfacing with bus lines in bus organized systems. When the output control input is taken high, the multiplexer outputs are sent into a high impedance state. When the output control is held low, the associated multiplexer chooses the correct output channel for the given input signals determined by the select A and B inputs.
Features
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- High Speed Operation: tpd (Data to Y) = 18 ns typ (CL = 50 p F) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Select inputs B X L L L L H H H H A X L L H H L L H H Data iputs C0 X L H X X X X X X C1 X X X L H X X X X C2 X X X X X L H X X C3 X X X X X X X L H Output Control G H L L L L L L L L Output Y Z L H L H L H L H
Notes 1. X: irrelevant 2. Address inputs A and B are mon to both sections.
Pin Arrangement
Output control 1G Select B
1 2 3
1C3 1C2 1C1
B B B 2C1 A A 2C0
16 VCC 15 2G Output control 14 A
2C3 2C2
Select
Data inputs
4 5 6
13 12 11 10 9 2Y Output Data inputs
1C0 B
Output 1Y GND
7 8
1Y A
2Y
(Top view)
DC Characteristics
Ta = 25°C Item Input voltage Symbol VIH Ta =
- 40 to +85°C Max
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- 0.5 1.35 1.8
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- 0.1 0.1 0.1 0.33 0.33 ±5.0 ±1.0 40 µA µA µA I OL = 4 m A I OL = 5.2 m A Vin = VIH or VIL, Vout = VCC or GND Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH =
- 4 m A I OH =
- 5.2 m A Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH =
- 20 µA V Unit V Test Conditions
VCC (V) Min Typ Max Min 2.0 4.5 6.0 1.5
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