Philips hef40245b DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

For a complete data sheet, please also download:

•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC

•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC

HEF40245B
buffers

Octal bus transceiver with 3-state
outputs

Product specification
File under Integrated Circuits, IC04

January 1995

Philips Semiconductors Product specification

Octal bus transceiver with 3-state outputs

DESCRIPTION

The HEF40245B is an octal bus transmitter/receiver
designed for 8-line asynchronous, 2-way data
communication between data buses. It features output
stages with high current output capability suitable for
driving highly capacitive loads.

The direction input (DR) controls transmission of data from
bus A to bus B, or bus B to bus A, depending on its logic
level. The 3-state outputs are controlled by the enable
input EO. A HIGH on EO causes the outputs to assume a
high impedance OFF-state. The device also features
hysteresis on all inputs to improve noise immunity.

Schmitt-trigger action in the inputs makes the circuit highly
tolerant to slower input rise and fall times.

The HEF40245B is pin and functionally compatible with
the TTL ‘245’ device.

PINNING

A
B
DR direction input
EO output enable input (active LOW)

HEF40245BP(N): 20-lead DIL; plastic (SOT146-1)
HEF40245BD(F): 20-lead DIL; ceramic (cerdip) (SOT152)
HEF40245BT(D): 20-lead SO; plastic (SOT163-1)
( ): Package Designator North America

0
0

to A
to B

HEF40245B

buffers

7
7

data input/output
data input/output

Fig.1 Pinning diagram.

January 1995 2

Fig.2 Logic diagram; for functional diagram see

Fig.3.

FAMILY DATA, IDDLIMITS category buffers

See Family Specifications.