74F656A datasheet(2/12 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F655A*

74F656A

Buffers/drivers

74F655A Octal buffer/driver with parity, inverting (3-State)

74F656A Octal buffer/driver with parity, non-inverting (3-State)

1991 Jul 17

853-0383 03305

* Discontinued part. Please see the Discontinued Products List.

FEATURES

• Significantly improved AC performance over 74F655 and 74F656

• High impedance NPN base input for reduced loading

(40

µA in High and Low states)

• Ideal in applications where high output drive and light bus loading

are required (IIL is 40µA vs. FAST std of 600µA)

• 74F655A combines 74F240 and 74F280A functions in one

package

• 74F656A combines 74F244 and 74F280A functions in one

package

• 74F655A Inverting

• 74F656A Non-inverting

• 3-State outputs sink 64mA and source 15mA

• 24-pin plastic Slim DIP (300mil) package

• Inputs on one side and outputs on the other side simplifies PC

board layout

• Combined functions reduce part count and enhance system

performance

• Industrial temperature range available (–40°C to +85°C)

DESCRIPTION

The 74F655A and 74F656A are octal buffers and line drivers with

parity generation/checking designed to be employed as memory

address drivers, clock drivers and bus-oriented

transmitters/receivers. These parts include parity generator/checker

to improve PC board density.

TYPE

TYPICAL

PROPAGATION

DELAY

TYPICAL SUPPLY CURRENT

(TOTAL)

74F655A

6.5ns

64mA

74F656A

6.5ns

64mA

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

INDUSTRIAL RANGE

VCC = 5V ±10%,

Tamb = –40°C to +85°C

PKG DWG #

24-pin Plastic Slim

DIP (300mil)

N74F656AN

I74F656AN

SOT222-1

24-pin Plastic SOL

N74F656AD

I74F656AD

SOT137-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F(U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

D0–D7

Data inputs

2.0/0.066

µA/40µA

Parity input

1.0/0.033

µA/20µA

OE0, OE1, OE2

Output Enable Inputs (active Low)

1.0/0.033

µA/20µA

ΣE, ΣO

Parity outputs

750/106.7

15mA/64mA

Q0–Q7

Data outputs (74F655A)

750/106.7

15mA/64mA

Q0–Q7

Data outputs (74F656A)

750/106.7

15mA/64mA

NOTE: One (1.0) FAST Unit Load (U.L.) is defined as: 20

µA in the High state and 0.6mA in the Low state.

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