SN75189ADR

SN75189ADR is a Texas Instruments SN75189 eight-bit bidirectional bus transceiver/driver. It buffers and optionally bridges an 8-bit data path between two devices or subsystems, letting you isolate or transfer data as needed.
Key points:
- 8 data lines, bidirectional
- TTL/CMOS-compatible inputs
- 5V operation
- Tri-state outputs controlled by OE (output enable)
- DIR input to select transfer direction
- Package: commonly a 28-pin variant (ADR denotes a specific package variant)
Typical uses:
- Microprocessor bus buffering and isolation
- Peripheral I/O expansion
- Data-path bridging between buses or subsystems
How to use:
- Connect the two 8-bit buses to the A and B sides
- Use DIR to choose direction
- Use OE to enable/disable outputs
For exact pinout, timings, drive strength, and power specs, consult the TI SN75189ADR datasheet. I can summarize a specific section or provide a quick pinout table if you’d like.

Pin count: 20 pins (DIP/SOIC variants).
Function: SN75189ADR is an 8-bit, bidirectional bus transceiver (buffer) with tri-state outputs. It connects two 8-bit buses, with direction control (DIR) to select A→B or B→A data flow and an output enable (OE) to tri-state the outputs for shared-bus operation.

Texas Instruments (TI) manufactures the SN75189ADR. TI is an American multinational technology company and one of the world's largest semiconductor manufacturers, designing and producing analog and mixed-signal, digital, and embedded-processing integrated circuits.

- 8-bit bidirectional bus transceiver/buffer used to interface a microprocessor/MCU data and address buses to peripherals.
- Provides tri-state outputs for bus sharing, enabling proper bus isolation and preventing contention.
- Useful in memory expansion, I/O expansion, and backplane/interconnect applications.
- Allows level shifting or voltage translation between devices on different logic levels.
- Good for fan-out buffering and signal integrity in digital systems with multiple masters/slaves.

SN75189ADR comes in a 28-pin plastic DIP (P-DIP) package.