Product Overview
National Semiconductor DM74LS245N 3-State Octal Bus Transceiver DIP-20
Condition
Unused new old stock (NOS). Straight through-hole pins with legible package markings reading DM74LS245N and date code S=B8604.
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Product Overview
The National Semiconductor DM74LS245N is an 8-bit bidirectional bus transceiver housed in a standard 20-pin dual in-line package (DIP-20). Designed for asynchronous two-way communication between data buses, it features 3-state outputs capable of driving high-capacitance bus lines. Control logic includes a direction pin (DIR) to dictate data flow from port A to port B or vice versa, along with an active-low output enable pin to isolate the buses entirely when needed.
Key Features
- 8-bit bidirectional data path with 3-state outputs
- Standard DIP-20 package with 0.300-inch row spacing
- Logic family: Low-power Schottky TTL (74LS)
- Supply voltage: 4.75 V to 5.25 V (5 V nominal)
- Output drive capability: -15 mA IOH and 24 mA IOL on bus ports
- Operating temperature range: 0°C to 70°C
- Direct pin-compatible replacement for standard 74LS245 devices
Applications
- Isolating and driving data buses in vintage 8-bit computer restorations
- Interfacing bidirectional memory and peripheral lines in custom breadboard designs
- Restoring arcade system logic boards requiring original National Semiconductor TTL chips
- Breadboard prototyping with microcontrollers where standard 0.1-inch lead pitch is required
Frequently Asked Questions
What logic voltage does the DM74LS245N require?
This chip operates on a standard 5 V logic rail with an allowable operating range of 4.75 V to 5.25 V.
How are data direction and output states controlled?
Pin 1 (DIR) selects the transmission direction (A to B or B to A), while pin 19 (G) enables the outputs when pulled low or places them in a high-impedance state when driven high.
Why buy a single vintage IC instead of an overseas multi-pack?
Buying a single piece avoids surplus minimums and gives you the exact component shown, ready for repairs or restoration benches without waiting weeks on untracked bulk shipments. Shipping is $8 flat rate, free on orders over $28, and orders leave our Idaho warehouse the same or next business day.
Nothing quite matches the satisfaction of seating a clean DIP chip into a socket and watching an old bus line spring back to life. Keep the clock running and let the data flow.
