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M74HCT257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

STMicroelectronics 

M74HCT257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

s HIGH SPEED :

tPD = 13 ns (TYP.) at VCC = 4.5V

s LOW POWER DISSIPATION:

ICC =4µA(MAX.) at TA=25°C

s COMPATIBLE WITH TTL OUTPUTS :

VIH = 2V (MIN.) VIL = 0.8V (MAX)

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 6mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

DESCRIPTION

The M74HCT257 is an high speed CMOS QUAD

2 CHANNEL MULTIPLEXER (3-STATE)

fabricated with silicon gate C2MOS technology.

This IC is composed of an independent 2-channel

multiplexer with common SELECT and ENABLE

(OE) input.

The M74HCT257 is a non-inverting multiplexer.

When the ENABLE input is held "High", outputs of

DIP

SOP

TSSOP

ORDER CODES

PACKAGE

TUBE

T&R

DIP

SOP

TSSOP

M74HCT257B1R

M74HCT257M1R M74HCT257RM13TR

M74HCT257TTR

the IC become in a High-Impedance state. If

SELECT input is held low, "A" data is selected,

when SELECT is high , "B" data is chosen.

All inputs are equipped with protection circuits

against static discharge and transient excess

voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

August 2001

1/10

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