74LS640/74F640 Octal Bus Transceiver IC With Inverting 3-State Outputs

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74LS640/74F640 IC is an octal transceiver featuring inverting 3-state bus compatible outputs. The 74F640/74LS640 bus transceivers are designed for asynchronous two-way communication between data buses. The devices transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction control (DIR) input. The enable input (G) can be used to disable the device so the buses are effectively isolated. The 74LS6407/4F640 IC has a vast array of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL, which allows it to be used in high speed, low noise applications.

What is a Bus Transceiver Circuit?

Bus transceiver circuits are simple electronic tri-state, bi-directional devices that allow the flow of data between two points, making them compatible with bus-oriented systems or the bi-directional (input or output) control of any interface circuitry. A Bus transceiver can be inverting or non-inverting, common examples are 74LS243 & LS242 IC series. They are designed for asynchronous two-way communication between two data buses or input/output devices. The transceiver allows for the transmission of data from the terminal A to terminal B and vice versa depending on the logic level at the direction-control input.

74LS640/74F640 Pinout

74LS640 Pin Configuration

Pin NoPin NameDescription
1T/R’Transmit/Receive input For directional control (DIR)
2A0Data (I/O) pin, Port A0
3A1Data (I/O) pin, Port A1
4A2Data (I/O) pin, Port A2
5A3Data (I/O) pin, Port A3
6A4Data (I/O) pin, Port A4
7A5Data (I/O) pin, Port A5
8A6Data (I/O) pin, Port A6
9A7Data (I/O) pin, Port A7
10GNDGround Pin
11B7Data (I/O) pin, Port B7
12B6Data (I/O) pin, Port B6
13B5Data (I/O) pin, Port B5
14B4Data (I/O) pin, Port B4
15B3Data (I/O) pin, Port B3
16B2Data (I/O) pin, Port B2
17B1Data (I/O) pin, Port B1
18B0Data (I/O) pin, Port B0
19OE’Active Low Output Enable Input
20VccChip Supply Voltage

74LS640/74F640 Features & Specifications

  • Technology Family: f
  • VCC (Min) (V) 4.75
  • VCC (Max) (V) 5.25
  • Bits (#) 8
  • Voltage (Nom) (V) 5
  • F @ nom voltage (Max) (MHz) 35
  • ICC @ nom voltage (Max) (mA) 0.09
  • Propagation delay (Max) (ns) 15
  • IOL (Max) (mA) 24
  • IOH (Max) (mA) -15
  • Rating Catalog
  • Operating temperature range (C) 0 to 70
  • High-Impedance NPN Base Inputs for Reduced Loading (70 mA in High and Low States)
  • Ideal for Applications which Require High-Output Drive and Minimal Bus Loading
  • Octal Bidirectional Bus Interface
  • 3-State Buffer Outputs Sink 64 mA and Source 15 mA
  • ESD Sensitive — 4000 V HBM

Applications

  • Usually used in cell phones & other communication devices such as walkie-talkies & CB radios.

You can download this datasheet for 74LS640/74F640 Octal Bus Transceiver IC With Inverting 3-State Outputs from the link given below:

See Also: 74LS138 1-To-8 Decoder/Demultiplexer IC – Datasheet | 74LS45 BCD to Decimal Decoders/Drivers IC – Datasheet | 74LS31 Hex Delay Element/Delay Line Generator IC – Datasheet