Rochester Electronics, LLC 74S288AN

Five address lines select one eight-bit word. The enable input permits the selected word at eight outputs; when disabled, the outputs are high impedance. National Semiconductor's original DM74S288 family data lists the AN grade as a faster 25 ns maximum address-access variant under its commercial test conditions. Confirm the corresponding Rochester exact-order data before relying on that timing limit.

• 32-by-8 organization stores 256 fixed bits.
• Three-state outputs support shared TTL buses.
• Schottky architecture supports fast lookup operation.
• One-time fuse programming retains data without a battery.
• 16-pin dual-inline format supports legacy socketed designs.

The original family document describes titanium-tungsten fuse links and five address inputs, an enable control and eight data outputs. It says unprogrammed devices ship with low data in all locations and can have selected highs programmed under a specified procedure. A supplied part might already carry an application-specific image; the part number alone does not establish whether it is blank.

Rochester and distributor listings classify the AN code as a 16-pin plastic DIP. The source catalog has no package value, and the registered generic 16-DIP artwork is marked missing. Confirm pin-one orientation, body dimensions and socket compatibility against the exact lot and controlled outline.

Assembly checks

• Verify pin count and lead rows.
• Check the pin-one notch and lead finish.
• Review storage and handling history.

The registered 16-DIP JPG is absent locally.

The original DM74S288N/AN dual-inline top-view drawing shows outputs Q0 to Q6 on pins 1 to 7, ground on pin 8, Q7 on pin 9, addresses A0 to A4 on pins 10 to 14, enable on pin 15 and VCC on pin 16. Verify enable polarity and exact Rochester pin assignment before inserting or programming a unit.

Validate electrical, timing and programming limits against a controlled Rochester exact-order data sheet before production use.

No database-verified substitute is linked. Sellers call 74S288AN an alternate for 27S19APC, but that does not establish pin, programming or image compatibility. Compared with the N grade, the original AN family grade has a different maximum address-access limit. Replacements must match the programmed fuse pattern as well as package, polarity, speed and drive.

Rochester Electronics is the catalog supplier for exact code 74S288AN. The original National Semiconductor DM54S288/DM74S288 document covers the N and AN variants, their 16-pin DIP drawing and the 25 ns AN family grade. The available exact-code Rochester PDF was not independently retrieved; confirm the manufacturer-controlled revision before applying original timing limits to this lot.

• Legacy TTL lookup and logic-decode tables.
• Fixed control-word storage in existing equipment.
• Programmed spare parts for socketed service assemblies.

Authenticate lot markings and traceability and read the programmed 256-bit image before replacing an installed part. The catalog records 969 units at USD 9.77 with minimum quantity 12 and no tiers. Indexed Rochester distributor data shows 7,910 units with USD 24.12/1, 23.40/25, 22.67/100, 21.95/500 and 21.23/1000; these are not reconciled with the catalog or verified as a current checkout quote.

Preserve the customer-specific PROM image and verify programmer support, fuse map, pin orientation and access timing. The blank catalog package, missing 16-DIP JPG, unreconciled exact-order data and unverified current seller pricing prohibit publication.