Product Overview
8085 and 8086 DRAM Refresh and Address Controller, Intel CERDIP-40
Condition
Unused new old stock (NOS). Markings legible: Intel logo, D8202A, © INTEL '80. Faint surface marks on the ceramic lid to the left of the marking.
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Product Overview
Intel's D8202A sits between an 8080A, 8085A, iAPX 88 or iAPX 86 processor and its dynamic RAM, handling the address multiplexing and refresh cycles DRAM needs so the processor does not have to. It drives up to four memory banks over a 14-bit address bus. The 8202A is discontinued.
Key Features
- Dynamic RAM controller for 8080A, 8085A, iAPX 88 and iAPX 86 systems
- Up to four memory banks, 14-bit address bus
- 5.0 V nominal supply, 4.5 V to 5.5 V range, 270 mA maximum supply current
- Operating temperature 0 to 70 C
- 40-pin glass-sealed ceramic DIP (CERDIP), 2.54 mm pin pitch, 52.3 x 15.24 mm body
Applications
- Replacing the socketed DRAM controller on an 8085 or 8086 single-board computer
- Rebuilding the memory section of an iAPX 88 industrial or lab controller board
- Adding a period-correct DRAM bank to a homebrew 8085 or 8080A build
Frequently Asked Questions
Which processors does the 8202A work with?
The 8080A, 8085A, iAPX 88 (8088) and iAPX 86 (8086).
What supply does it run on?
A single 5 V rail, 4.5 V to 5.5 V, with a maximum supply current of 270 mA.
Is this the D8202A-1?
No. The marking reads D8202A with no suffix after the A, which is the base grade. The D8202A and the D8202A-1 are separate orderable numbers, so match the suffix on the board's original chip.
An 8085 or 8086 never learns that its memory is dynamic; the 8202A splits each address into row and column and slips the refresh cycles in between, out of the processor's sight. An old board built that way has a place for it.
