74F640 Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

componentes Descripción

Lista de partido

74F640

Octal bus transceiver, inverting (3-State)

Philips Electronics 

Philips Semiconductors

Octal bus transceiver, inverting (3-State)

Product specification

74F640

FEATURES

• High-impedance NPN base inputs for reduced loading

(70µA in High and Low states)

• Ideal for applications which require high-output drive and minimal

bus loading

• Inverting version of 74F245

• Octal bidirectional bus interface

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

DESCRIPTION

The 74F640 is an octal transceiver featuring inverting 3-State bus

compatible outputs in both transmit and receive directions. The B

port outputs are capable of sinking 64mA and sourcing 15mA,

providing very good capacitive drive characteristics. The device

features an Output Enable (OE) input for easy cascading and

Transmit/Receiver (T/R) input for direction control. The 3-State

outputs, B0–B7, have been designed to prevent output bus loading if

the power is removed from the device.

PIN CONFIGURATION

T/R 1

A0 2

A1 3

A2 4

A3 5

A4 6

A5 7

A6 8

A7 9

GND 10

20 VCC

19 OE

18 B0

17 B1

16 B2

15 B3

14 B4

13 B5

12 B6

11 B7

SF00198

TYPE

74F640

TYPICAL

PROPAGATION

DELAY

3.5ns

TYPICAL SUPPLY CURRENT

(TOTAL)

78mA

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

20-pin plastic DIP

N74F640N

20-pin plastic SOL

N74F640D

PKG DWG #

SOT146-1

SOT163-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

A0 - A7, B0 - B7

Data inputs

OE

Output Enable input (active Low)

T/R

Transmit/Receive input

A0 - A7

A port outputs

B0 - B7

B port outputs

NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.

74F(U.L.)

HIGH/LOW

3.5/0.115

2.0/0.067

2.0/0.067

150/40

750/106.7

LOAD VALUE

HIGH/LOW

70µA/70µA

40µA/40µA

40µA/40µA

3.0mA/24mA

15mA/64mA

1989 Nov 27

2

853–0381 98171

Share Link: