74LS640 Octal Inverting Bus Transceiver Tri-State

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The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS640 octal 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

74LS640 Features

  • Designed for Asynchronous two-way Communication between Data Buses
  • Enable Input for Disabling the Device
  • 3-State Outputs Drive Bus Lines Directly
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS640 Specifications

Supply Voltage4.75 – 5.25Vdc
Maximum Clock Frequency40Mhz
Power Dissipation2mW/gate @100kHz
Minimum Output Current8mA
Propagation Delay10nS
Fan Out (TTL Loads)20

74LS640 Pinout Diagram

74LS640 Pin Description

Pin NoPin NameDescription
1T/R’Control Pin
2A0Input / Output Of Bus Transceiver A
3A1Input / Output Of Bus Transceiver A
4A2Input / Output Of Bus Transceiver A
5A3Input / Output Of Bus Transceiver A
6A4Input / Output Of Bus Transceiver A
7A5Input / Output Of Bus Transceiver A
8A6Input / Output Of Bus Transceiver A
9A7Input / Output Of Bus Transceiver A
10GNDGround
11B7Input / Output Of Bus Transceiver B
12B6Input / Output Of Bus Transceiver B
13B5Input / Output Of Bus Transceiver B
14B4Input / Output Of Bus Transceiver B
15B3Input / Output Of Bus Transceiver B
16B2Input / Output Of Bus Transceiver B
17B1Input / Output Of Bus Transceiver B
18B0Input / Output Of Bus Transceiver B
19OE’Enable Pin 2
20VCCPositive Supply

Applications

  • Provide bidirectional, input or output control, of either digital or analogue devices to a common shared data bus

74LS640 Alternative Equivalent

74LS645

Download 74LS640 Octal Inverting Bus Transceiver Tri-State Datasheet from the link given below.