74VHCT157 데이터 시트보기 (PDF) - STMicroelectronics

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74VHCT157

QUAD 2 CHANNEL MULTIPLEXER

STMicroelectronics 

®

74VHCT157A

QUAD 2 CHANNEL MULTIPLEXER

s HIGH SPEED: tPD = 6.2 ns (TYP.) at VCC = 5V

s LOW POWER DISSIPATION:

ICC = 4 µA (MAX.) at TA = 25 oC

s COMPATIBLE WITH TTL OUTPUTS:

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

s POWER DOWN PROTECTION ON INPUTS &

OUTPUTS

s SYMMETRICAL OUTPUT IMPEDANCE:

|IOH| = IOL = 8 mA (MIN)

s BALANCED PROPAGATION DELAYS:

tPLH ≅ tPHL

s OPERATING VOLTAGE RANGE:

VCC (OPR) = 4.5V to 5.5V

s PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 157

s IMPROVED LATCH-UP IMMUNITY

s LOW NOISE: VOLP = 0.8V (Max.)

DESCRIPTION

The 74VHCT157A is an high-speed CMOS

QUAD 2-CHANNEL MULTIPLEXER fabricated

with sub-micron silicon gate and double-layer

metal wiring C2MOS technology.

It consists of four 2-input digital multiplexers with

common select and strobe inputs. It is a

PRELIMINARY DATA

SOP

TSSOP

PACKAGE

SOP

TSSOP

ORDER CODES

T UB E

T&R

74VHCT157AM 74VHCT157AMTR

74VHCT157ATTR

non-inverting multiplexer. When the STROBE

input is held high, selection of data is inhibited

and all the outputs become low. The SELECT

decoding determines whether the A or B inputs

get routed to their corresponding Y outputs.

Power down protection is provided on all inputs

and outputs 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

March 2000

1/9

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