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. 74LS243 four-data line transceiver is designed for asynchronous two-way communications between data buses. It can be used to drive terminated lines down to 133Ω.
74LS243 Features
- Designed for Asynchronous Two-way Communications between Data Buses
- PNP Inputs reduce DC Loading on Bus Line
- Hysteresis at Data Inputs Improved Noise Margin
- Operating Temperature to 70°C
- Standard TTL Switching Voltages
74LS243 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 |
74LS243 Pinout Diagram
74LS243 Pin Description
| Pin No | Pin Name | Description |
| 1 | OE1′ | Enable Output Low |
| 2 | NC | No Connection |
| 3 | 1A | Channel 1 Of Transceiver (A) |
| 4 | 2A | Channel 2 Of Transceiver (A) |
| 5 | 3A | Channel 3 Of Transceiver (A) |
| 6 | 4A | Channel 4 Of Transceiver (A) |
| 7 | GND | Ground |
| 8 | 4B | Channel 4 Of Transceiver (B) |
| 9 | 3B | Channel 3 Of Transceiver (B) |
| 10 | 2B | Channel 2 Of Transceiver (B) |
| 11 | 1B | Channel 1 Of Transceiver (B) |
| 12 | NC | No Connection |
| 13 | OE2 | Output Enable Active High |
| 14 | VCC | Positive Supply |
Applications
- Transmit the data in the form of voice or data or video over the wireless medium
74LS243 Alternative Equivalent
74LS242, 74LS245
Download the 74LS243 Quad Transceiver Tri-State Datasheet from the link given below.
