M54HC251 datasheet(1/11 Pages) STMICROELECTRONICS

Numer części	M54HC251

Szczegółowy opis	8 BIT SIPO SHIFT REGISTER

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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M54HC251

M74HC251

February 1993

8 BIT SIPO SHIFT REGISTER

B1R

(Plastic Package)

ORDER CODES :

M54HC251F1R

M74HC251M1R

M74HC251B1R

M74HC251C1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

NC =

No Internal

Connection

.

HIGH SPEED

tPD = 14 ns (TYP.) AT VCC =5 V

.

LOW POWER DISSIPATION

ICC =4

µA (MAX.) AT TA =25 °C6 V

.

HIGH NOISE IMMUNITY

VNIH =VNIL =28 % VCC (MIN.)

.

OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.

SYMMETRICAL OUTPUT IMPEDANCE

IOH =IOL = 4 mA (MIN.)

.

BALANCED PROPAGATION DELAYS

tPLH =tPHL

.

WIDE OPERATING VOLTAGE RANGE

VCC (OPR) = 2 V TO 6 V

.

PIN AND FUNCTION COMPATIBLE WITH

54/74LS251

DESCRIPTION

The M54/74HC251 is a high speed CMOS 8-CHAN-

NEL MULTIPLEXER (3-STATE) fabricated in silicon

gate C

2MOS technology. It has the same high

speed performance of LSTTL combined with true

CMOS low power consumption. This multiplexer

features both true (Y) and complement (W) outputs

as well as STROBE input. The STROBE must be a

low logic level to enable this device. When the

STROBE input is high, both outputs are in the high

impedance state. When enabled, address informa-

tion on the data select inputs determines which data

input is routed to Y and W. All inputs are equipped

with protection circuits against static discharge and

transient excess voltage.

INPUT AND OUTPUT EQUIVALENT CIRCUIT

1/11

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