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HEF40374

Octal D-type flip-flop with 3-state outputs

Philips Electronics 

Philips Semiconductors

Octal D-type flip-flop with 3-state outputs

Product specification

HEF40374B

MSI

DESCRIPTION

The HEF40374B is an octal D-type flip-flop with 3-state

buffered outputs with a common clock input (CP). The

device is used primarily as an 8-bit positive edge-triggered

storage register for interfacing with a 3-state bus. Data on

the D-inputs is transferred to storage during the

LOW-to-HIGH transition of the clock (CP) input. The

3-state output buffers are controlled by an active LOW

output enable input (EO). A HIGH on EO forces the eight

outputs to a high impedance OFF-state. When EO is

LOW, the data in the register appears at the outputs.

The output stages have high current output capability

suitable for driving highly capacitive loads.

The device features hysteresis on the CP input to improve

noise rejection.

Schmitt-trigger action in the E input makes the circuit

highly tolerant to slower input rise and fall times.

The HEF40374B is pin and functionally compatible with

the TTL ‘374’ device.

Supply voltage range: 3 to 15 V.

Fig.1 Functional diagram.

Fig.2 Pinning diagram.

HEF40374BP(N): 20-lead DIL; plastic (SOT146-1)

HEF40374BD(F): 20-lead DIL; ceramic (cerdip)

(SOT152)

HEF40374BT(D): 20-lead SO; plastic (SOT163-1)

( ): Package Designator North America

PINNING

D0 to D7

CP

EO

O0 to O7

data inputs

clock input

output enable input (active LOW)

3-state buffered outputs

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

January 1995

2

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