Product Overview
74F245 8-Bit Bidirectional FAST TTL Logic Transceiver with 3-State Outputs
Condition
New old stock. Sold each. Markings legible: 74F245PC.
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Product Overview
National Semiconductor 74F245PC is an 8-bit bidirectional bus transceiver housed in a 20-pin dual in-line package. Part of the Fairchild Advanced Schottky TTL (FAST) family, this device provides high-speed asynchronous two-way communication between data buses. TRI-STATE non-inverting outputs and high drive capability allow direct interfacing with system buses and memory arrays.
Key Features
- 8-bit bidirectional data path with asynchronous direction control
- High-speed FAST logic family with typical propagation delay of 4.0 ns
- Non-inverting TRI-STATE bus outputs
- High sink capability: 64 mA on B-port outputs, 24 mA on A-port outputs
- Standard 5.0 V logic operation with 4.5 V to 5.5 V operating range
- 20-pin plastic DIP package with 0.100 inch lead pitch and 0.300 inch row spacing
Applications
- Upgrading or repairing legacy 8-bit, 16-bit, and 32-bit computer motherboards and peripheral cards
- Interfacing microprocessors to system data buses in retrocomputing and industrial automation hardware
- Breadboard prototyping of custom 8-bit microcontrollers, bus buffers, and DIY digital synth modules
Frequently Asked Questions
What controls the data direction on the 74F245PC?
Pin 1 (DIR) sets the direction of data flow between the A bus and B bus, while Pin 19 (OE) enables the outputs or sets them to a high-impedance state.
What is the pin spacing and package style?
The device is in a standard 20-pin plastic dual in-line package (PDIP-20) with 0.100-inch lead spacing and 0.300-inch row spacing, fitting standard IC sockets and breadboards.
Can the 74F245PC replace standard 74LS245 or 74HC245 devices?
It is pin-compatible with 74LS245 and 74ALS245 parts and provides faster switching speeds and higher sink current at 5V TTL levels. Always verify timing and voltage compatibility when dropping it into CMOS-only circuits. The price-break table on this page gives the price per piece at each quantity.
Bus contention was the headache of the early computing boom, and the 245 was the traffic cop that kept data lanes running clean. Drop this into your socket and let the old bus run like it was meant to.
