SN54LS245, SN74LS245 are octal bus transceivers with 3-state outputs designed by Texas Instruments. These products are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. The devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can disable the device so that the buses are effectively isolated.
The SN54LS245 and SN74LS245 are octal bus transceivers with 3‑state outputs designed for asynchronous two‑way communication between data buses. They feature direction‑control (DIR) and output‑enable (OE) inputs that allow the device to isolate or connect the A and B bus sides as needed.
The document lists absolute‑maximum ratings, recommended operating conditions, detailed electrical characteristics, and a comprehensive package option addendum with ordering information for PDIP, SOIC, SSOP, and other package types. Mechanical drawings and an important notice about product availability and warranty are also included.
| Supply voltage (VCC) | 4.5 V – 5.5 V |
|---|---|
| High‑level output current (I_OH) | 12 mA (SN54LS245) / 24 mA (SN74LS245) |
| Low‑level output current (I_OL) | 12 mA (SN54LS245) / 24 mA (SN74LS245) |
| Operating temperature range | -55 °C to 125 °C |
| Propagation delay (tPLH / tPHL) | Typical 8 ns |
The recommended supply voltage is 4.5 V to 5.5 V, with a typical value of 5 V.
The SN54LS245 can source up to 12 mA, while the SN74LS245 can source up to 24 mA.
They are rated for operation from –55 °C to +125 °C.