HD74HC257

Features:

·  High Speed Operation: tpd (Data to Y) = 10.5 ns typ (CL = 50 pF)
·  High Output Current: Fanout of 15 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)


Pinout




Specifications

Item	Symbol	Rating	Unit
Supply voltage range	VCC	0.5 to +7.0	V
Input voltage	VIN	0.5 to VCC + 0.5	V
Output voltage	VOUT	0.5 to VCC + 0.5	V
Output current	IOUT	±35	mA
DC current drain per VCC, GND	ICC, IGND	±75	mA
DC input diode current	IIK	±20	mA
DC output diode current	IOK	±20	mA
Power dissipation per package	PT	500	mW
Storage temperautre	Tstg	65 to +150

Description

The large output drive capability coupled with the 3-state feature make HD74HC257 ideal for interfacing with bus lines in a bus organized system. When the output control input line is taken high, the outputs of all four multiplexers are sent into a high impedance state. When the output control line is low, the select input chooses whether the A or B input is used.