Philips Semiconductors

Product specification

74ALS651/74ALS651-1

74ALS652/74ALS652-1

Transceiver/register

74ALS651/651-1

Octal transceiver/register, inverting (3-State)

74ALS652/652-1

Octal transceiver/register, non-inverting (3-State)

2

1991 Feb 08

853–1407 01670

FEATURES

DESCRIPTION

The 74LAS651 and 74ALS652 transceivers/registers consist of bus

transceiver circuits with 3-State outputs, D-type flip-flops, and

control circuitry arranged for multiplexed transmission of data

directly from the input bus or the internal registers. Data on the A or

B bus will be clocked into the registers as the appropriate clock pin

goes High. Output enable (OEAB, OEBA) and select (SAB, SBA)

pins are provided for bus management. The 74LAS651-1 and

TYPE

TYPICAL

TYPICAL

SUPPLY CURRENT

(TOTAL)

74ALS651/74ALS651-1

140MHz

40mA

74ALS652/74ALS652-1

140MHz

46mA

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

COMMERCIAL RANGE

DRAWING

NUMBER

24-pin plastic DIP

74ALS651N, 74ALS651-1N,

74ALS652N, 74ALS652-1N

SOT222-1

24-pin plastic SOL

74ALS651D, 74ALS651-1D,

74ALS652D, 74ALS652-1D

SOT137-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74ALS (U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

A0 – A7

A inputs

1.0/1.0

70

µA/0.1mA

B0 – B7

B inputs

1.0/1.0

70

µA/0.1mA

CPAB

A-to-B clock input

1.0/1.0

20

µA/0.1mA

CPBA

B-to-A clock input

1.0/1.0

20

µA/0.1mA

SAB

A-to-B select input

1.0/1.0

20

µA/0.1mA

SBA

B-to-A select input

1.0/1.0

20

µA/0.1mA

OEAB

A-to-B output enable input

1.0/1.0

20

µA/0.1mA

OEBA

B-to-A output enable input

1.0/1.0

20

µA/0.1mA

A0 – A7, B0 – B7

A, B outputs

750/240

15mA/24mA

A0 – A7, B0 – B7

A, B outputs (-1 version)

750/480

15mA/48mA

NOTE:

One (1.0) ALS unit load is defined as: 20

µA in the High state and 0.1mA in the Low state.