SN54LS245 and SN74LS245 are octal bus transceivers with 3-state outputs. They can drive bus lines directly, PNP inputs reduce dc loading on bus lines, and hysteresis at bus inputs improves noise margins. The typical propagation delay time is 8 ns. The document also includes ordering information for the product.
The document describes the SN54LS245 and SN74LS245 octal bus transceivers with 3-state outputs, designed for asynchronous two-way communication between data buses. These devices allow data transmission from an A bus to a B bus or vice versa based on the logic level at the DIR input, while the OE input can disable the device to isolate the buses.
| Supply Voltage (VCC) | 4.5 V to 5.5 V (SN74LS245); 4.75 V to 5.25 V (SN54LS245) |
|---|---|
| Operating Temperature Range | -55°C to 125°C (SN54LS245); 0°C to 70°C (SN74LS245) |
| High-Level Output Current | 12 mA to 15 mA (SN54LS245); 24 mA (SN74LS245) |
| Low-Level Output Current | 12 mA to 24 mA (SN54LS245); -15 mA (SN74LS245) |
| Propagation Delay Time | 8 ns to 12 ns typical |
The DIR (direction-control) input determines whether data transmits from the A bus to the B bus or from the B bus to the A bus.
The typical propagation delay time for both low-to-high and high-to-low level outputs is 8 ns.