M54HC7245/7640/7643/7645

M74HC7245/7640/7643/7645

January 1994

HC7640 INVERTING , HC7643 INVERTING/NON INVERTING

OCTAL BUS TRANSCEIVER (3-STATE): HC7645 NON INVERTING

B1R

(Plastic Package)

ORDER CODES :

M54HCXXXXF1R

M74HCXXXXM1R

M74HCXXXXB1R

M74HCXXXXC1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTION (top view)

.

HIGH SPEED

.

LOW POWER DISSIPATION

.

HIGH NOISE IMMUNITY

.

OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

.

SYMMETRICAL OUTPUT IMPEDANCE

.

BALANCED PROPAGATION DELAYS

.

WIDE OPERATING RANGE

.

PIN AND FUNCTION COMPATIBLE

WITH 54/74LS245/640/643

DESCRIPTION

The M54/74HC7245 HC7640, HC7643 and HC7645

utilise silicon gate C

operating speeds equivalent to LSTTL devices.

Along with the low power dissipation and high noise

immunity of standads C

possesses the capability to drive 15 LSTTL loads.

These IC’s are intended for two-way asynchronous

communication between data buses, and the

direction of data trasmission is determined by DIR

input. The enable input (G) can be used to disable the

device so that the buses are effectively isolated.

The HC7245/640/7643/7645 have the same pin

configuration and function as the HC245/640/643

and they have a hysteresis characteristics with each

input, so HC7245/7640/7643/7645 can be used as a

line receiver, etc. All input are equipped with

protection circuits against static discharge and

transient excess voltage.

IT IS PROHIBITED TO APPLY A SIGNAL TO A BUS

TERMINAL WHEN IT IS IN OUTPUT MODE AND

WHEN A BUS THERMINAL IS FLOATING (HIGH

IMPEDANCE STATE), IT IS REQUESTED TO FIX

THE INPUT LEVEL BY MEANS OF EXTERNAL

PULL DOWN OR PULL UP RESISTOR.

HC7640

HC7643

HC7645/ HC7245

HC7245 is electrically and funcutionally the same as the HC7645

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