74F647 datasheet(2/12 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F647/74F649

Octal transceivers/registers (open-collector)

74F647 Octal Transceiver/Register, Non-inverting (Open Collector)

74F649 Octal Transceiver/Register, Inverting (Open Collector)

1992 Feb 28

853-0876 05853

FEATURES

• High impedance NPN base inputs for reduced loading

(20

µA in High and Low states)

• Independent registers for A and B buses

• Multiplexed real-time and stored data

• Choice of non-inverting and inverting data paths

• Open Collector outputs

• 300 mil wide 24-pin Slim Dip package

DESCRIPTION

The 74F647 and 74F649 Transceivers/Registers consist of bus

transceiver circuits with open-collector outputs, D-type flip-flops, and

control circuitry arranged for multiplexed transmission of data

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

A or B bus will be clocked into the registers as the appropriate clock

pin goes to a High logic level. Output Enable (OE) and DIR pins are

provided to control the transceiver function. In the transceiver mode,

data present at the high impedance port may be stored in either the

A or B register or both.

The select (SAB, SBA) controls can multiplex stored and real-time

(transparent mode) data. The DIR determines which bus will receive

data when the Output Enable, OE is active Low. In the isolation

mode (Output Enable, OE = High), data from Bus A may be stored

in the B register and/or data from Bus B may be stored in the A

When an output function is disabled, the input function is still

enabled and may be used to store and transmit data. Only one of

the two buses, A or B, may be driven at a time. The following

examples demonstrate the four fundamental bus-management

functions that can be performed with the 74F647 and 74F649.

TYPE

TYPICAL

fmax

TYPICAL SUPPLY CURRENT

(TOTAL)

74F647

65MHz

125mA

74F649

65MHz

125mA

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

PKG DWG #

24-pin plastic Slim

DIP (300mil)

N74F647N, N74F649N

SOT222-1

24-pin plastic SOL

N74F647D, N74F649D

SOT137-1

PIN CONFIGURATION – 74F647

CPBA

SBA

VCC

GND

CPAB

SAB

DIR

SF01196

PIN CONFIGURATION – 74F649

CPBA

SBA

VCC

GND

CPAB

SAB

DIR

SF01196

74F647 Datasheet(PDF) 2 Page - NXP Semiconductors

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