January 1995

2

Philips Semiconductors

Product specification

Octal buffers with 3-state outputs

HEF40244B

buffers

DESCRIPTION

The HEF40244B is an octal non-inverting buffer with

3-state outputs. It features output stages with high current

output capability suitable for driving highly capacitive

loads.

The 3-state outputs are controlled by the output enable

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 HEF40244B is pin and functionally compatible with

the TTL ‘244’ device.

Fig.1 Functional diagram.

PINNING

See Family Specifications

HEF40244BP(N): 20-lead DIL; plastic (SOT146-1)

HEF40244BD(F):

20-lead DIL; ceramic (cerdip) (SOT152)

HEF40244BT(D):

20-lead SO; plastic (SOT163-1)

( ): Package Designator North America

inputs

inputs

bus outputs

bus outputs

output enable inputs (active LOW)

Fig.2 Pinning diagram.