74VHC257 Просмотр технического описания (PDF) - STMicroelectronics

Номер в каталоге

Компоненты Описание

Список матч

74VHC257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

STMicroelectronics 

®

74VHC257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

s HIGH SPEED: tPD = 3.7 ns (TYP.) at VCC = 5V

s LOWPOWER DISSIPATION:

ICC = 4 µA (MAX.) at TA = 25 oC

s HIGH NOISE IMMUNITY:

VNIH = VNIL = 28% VCC (MIN.)

s POWER DOWN PROTECTION ON INPUTS

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 8 mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s OPERATING VOLTAGE RANGE:

VCC (OPR) = 2V to 5.5V

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

s IMPROVED LATCH-UP IMMUNITY

s LOWNOISE VOLP = 0.8V (Max.)

DESCRIPTION

The 74VHC257 is an advanced high-speed

CMOS QUAD 2 CHANNEL MULTIPLEXER

(3-STATE) fabricated with sub-micron silicon gate

and double-layer metal wiring C2MOS

technology.

It is composed of four independent 2 channel

multiplexers with common SELECT and ENABLE

INPUT.

M

(Micro Package)

T

(TSSOP Package)

ORDER CODES :

74VHC257M

74VHC257T

The 74VHC257 is a non inverting multiplexer.

When the ENABLE INPUT is held ”High”, all

outputs become high impedance state. If

SELECT INPUT is held ”Low”, ”A” data is

selected, when SELECT INPUT is ”High”, ”B”

data is chosen.

Power down protection is provided on all inputs

and 0 to 7V can be accepted on inputs with no

regard to the supply voltage. This device can be

used to interface 5V to 3V.

All inputs and outputs are equipped with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

June 1999

1/9

Share Link: