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HEC40245BD

Octal bus transceiver with 3-state outputs

Philips Electronics 

Philips Semiconductors

Octal bus transceiver with 3-state outputs

Product specification

HEF40245B

buffers

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

A0 to A7

B0 to B7

DR

EO

data input/output

data input/output

direction input

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

Fig.2 Logic diagram; for functional diagram see

Fig.3.

FAMILY DATA, IDD LIMITS category buffers

See Family Specifications.

Fig.1 Pinning diagram.

January 1995

2

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