The 74LS245 is a part of the 74XXYY IC series. The SN54/74LS245 is an Octal Bus Transmitter/Receiver designed for 8-line asynchronous 2-way data communication between data buses. Direction Input (DR) controls the transmission of Data from bus A to bus B or bus B to bus A depending upon its logic level. The Enable input (E) can be used to isolate the buses.
- Hysteresis Inputs to Improve Noise Immunity
- 2-Way Asynchronous Data Bus Communication
- Input Diodes Limit High-Speed Termination Effects
- ESD > 3500 Volts
What is a Bus Transceiver?
Bus transceivers are 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 interface circuitry. A Bus transceiver can be inverting or non-inverting, common examples are 74LS243 & LS242 IC series. Bus transceivers 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 terminals A to terminals B or the reverse depending on the logic level at the direction-control input.
74LS245 Pinout
74LS245 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | DIR | Directional Control Input Pin |
| 2 | A1 | Data Bus Input Pin A1 |
| 3 | A2 | Data Bus Input Pin A2 |
| 4 | A3 | Data Bus Input Pin A3 |
| 5 | A4 | Data Bus Input Pin A4 |
| 6 | A5 | Data Bus Input Pin A5 |
| 7 | A6 | Data Bus Input Pin A6 |
| 8 | A7 | Data Bus Input Pin A7 |
| 9 | A8 | Data Bus Input Pin A8 |
| 10 | GND | Ground Pin |
| 11 | B8 | Data Bus Input Pin B8 |
| 12 | B7 | Data Bus Input Pin B7 |
| 13 | B6 | Data Bus Input Pin B6 |
| 14 | B5 | Data Bus Input Pin B5 |
| 15 | B4 | Data Bus Input Pin B4 |
| 16 | B3 | Data Bus Input Pin B3 |
| 17 | B2 | Data Bus Input Pin B2 |
| 18 | B1 | Data Bus Input Pin B1 |
| 19 | E’ | Active low Enable pin |
| 20 | Vcc | Chip Supply Voltage |
74LS245 Features & Specifications
- Technology Family: LS
- VCC (Min): 4.75V
- VCC (Max): 5.25V
- Bits (#): 8
- Voltage at nominal operation: 5V
- Frequency at normal voltage (Max): 35MHz
- ICC at normal voltage (Max): 0.09mA
- Propagation delay (Max): 8ns – 12ns
- 3-State Outputs to Drive Bus Lines Directly
- PNP Inputs Reduce DC Loading on Bus Lines
- Hysteresis at Bus Inputs Improves Noise Margins
- IOL (Max): 24mA
- IOH (Max): -15mA Rating: Catalog
- Operating temperature range: 0°C to 70°C
Applications
- Building Automation
- Electronic Point of Sale
- Factory Automation and Control
- Test and Measurement protocols
You can download this datasheet for 74LS245 Octal Bus Transceivers IC from the link provided below:
See Also: 74LS151 8 To 1 Line Selector Multiplexer IC – Datasheet | 74LS164 8-Bit Shift Register IC With Parallel Outputs – Datasheet | 74LS74 D-Type Positive Edge Triggered Flip-Flop IC – Datasheet
