74LS640 Octal Inverting Bus Transceiver Tri-State

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 Voltage	4.75 – 5.25Vdc
Maximum Clock Frequency	40Mhz
Power Dissipation	2mW/gate @100kHz
Minimum Output Current	8mA
Propagation Delay	10nS
Fan Out (TTL Loads)	20

74LS640 Pinout Diagram

74LS640 Pin Description

Pin No	Pin Name	Description
1	T/R’	Control Pin
2	A0	Input / Output Of Bus Transceiver A
3	A1	Input / Output Of Bus Transceiver A
4	A2	Input / Output Of Bus Transceiver A
5	A3	Input / Output Of Bus Transceiver A
6	A4	Input / Output Of Bus Transceiver A
7	A5	Input / Output Of Bus Transceiver A
8	A6	Input / Output Of Bus Transceiver A
9	A7	Input / Output Of Bus Transceiver A
10	GND	Ground
11	B7	Input / Output Of Bus Transceiver B
12	B6	Input / Output Of Bus Transceiver B
13	B5	Input / Output Of Bus Transceiver B
14	B4	Input / Output Of Bus Transceiver B
15	B3	Input / Output Of Bus Transceiver B
16	B2	Input / Output Of Bus Transceiver B
17	B1	Input / Output Of Bus Transceiver B
18	B0	Input / Output Of Bus Transceiver B
19	OE’	Enable Pin 2
20	VCC	Positive 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.