The 74LS243 are Quad Bus Transmitters/Receivers designed for 4-line asynchronous 2-way data communication between data buses. 74LS243 can be used to drive terminated lines down to 133 Ohm. It is the part of 74XXYY IC series. The 74LS243 IC has a wide range of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC 74LS243 is smaller in size and it has a much faster speed which makes it reliable in every kind of device.
What is a Bus Tranceiver?
Bus transceivers are electronic tri-state bi-directional devices which allow the flow of data between two points making them compatible with bus-oriented systems or the bi-directional (input or output) control of interface circuitry. A Bus transceiver can be inverting or non-inverting, common examples are 74LS243 & LS242 IC series. Bus tranceivers are designed for asynchronous two-way communication between two data buses or input/output device. The transceiver allows for the transmission of data from the terminals A to terminals B or the reverse depending on the logic level at the direction-control input.
74LS243 Pinout
74LS243 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | OE1′ | Active low enable pin OE1′ |
| 2 | NC | Not used |
| 3 | 1A | Data Bus Input 1A |
| 4 | 2A | Data Bus Input 2A |
| 5 | 3A | Data Bus Input 3A |
| 6 | 4A | Data Bus Input 4A |
| 7 | GND | Ground Pin |
| 8 | 4B | Data Bus Input 4B |
| 9 | 3B | Data Bus Input 3B |
| 10 | 2B | Data Bus Input 2B |
| 11 | 1B | Data Bus Input 1B |
| 12 | NC | Not used |
| 13 | OE2 | Enable pin OE2 |
| 14 | Vcc | Chip supply voltage |
74LS243 Features & Specifications
- Technology Family: LS
- VCC (Min): 4.75V
- VCC (Max): 5.25V
- Bits (#): 4
- Voltage (Nom): 5V Frequency at normal voltage (Max): 35MHz
- ICC at normal voltage (Max): 0.05mA
- 2-Way Asynchronous Data Bus Communication
- Input Clamp Diodes Limit High-Speed Termination Effects
- Propagation delay (Max): 18ns
- IOL (Max): 24mA
- IOH (Max): -15mA
- Rating: Catalog
- Operating temperature range (C): 0 to 70
Applications
- They are usually used to provide bidirectional, input or output control, of either digital or analogue devices to a common shared data bus.
You can download this datasheet for 74LS243 Quad Bus Transceiver IC With 3-State Outputs from the link given below:
See Also: 74LS164 8-Bit Shift Register IC With Parallel Outputs – Datasheet | 74LS138 1-To-8 Decoder/Demultiplexer IC – Datasheet | 74LS138 1-To-8 Decoder/Demultiplexer IC – Datasheet
