Intel 1103

Intel 1103
A ceramic C1103 variant.
Media type 10 µm p-MOS DRAM
Capacity 1 kilobit
Standard 18-pin DIP
Developed by Intel
Usage HP 9800 series,[1] PDP-11[2] and others
Released October 1970 (1970-10)

The 1103 is a dynamic random-access memory (DRAM) integrated circuit (IC) developed and fabricated by Intel. Introduced in October 1970, the 1103 was the first commercially available DRAM IC; and due to its small physical size and low price relative to magnetic-core memory, it replaced the latter in many applications.[3][1] While it was introduced in 1970, initial production yields were poor, and it was not until the fifth stepping of the production masks that it became available in large quantities during 1971.

Development

In 1969 William Regitz and his colleagues at Honeywell invented a three-transistor dynamic memory cell and began to canvass the semiconductor industry for a producer. The recently founded Intel Corporation responded and developed two very similar 1024-bit chips, the 1102 and 1103, under the lead of Joel Karp, working closely with William Regitz.[4] Ultimately only the 1103 went into production.

Microsystems International became the first second source for the 1103 in 1971.[5] Later National Semiconductor, Signetics, and Synertek manufactured the 1103 as well.

Technical details

DRAM memory cell of Intel i1103 chip.
tRWC580 nsRandom read or write cycle time (from one +ve Precharge edge to the next)
tPO300 nsAccess time: Precharge High to valid data out
tREF2 msRefresh time
VCC16 VSupply voltage
p-MOS10 µmProduction process (silicon gate MOSFET)
Capacity1024x1Capacity x bus width

References

  1. 1 2 Mary Bellis (August 25, 2016). "Who Invented the Intel 1103 DRAM Chip". ThoughtCo.
  2. ↑ PDP-11/45, 11/50, and 11/55 System Maintenance Manual (PDF). Digital Equipment Corporation. September 1976.
  3. ↑ Jacob, Bruce et al. (2008). Memory Systems: Cache, DRAM, Disk. Morgan Kaufmann Publishers. pp. 457–458.
  4. ↑ Computer History Museum: "Oral History of Joel Karp" Interviewed by Gardner Hendrie March 3, 2003 | Atherton, California
  5. ↑ Tedlow, Richard S. (2006). Andy Grove: The Life and Times of an American. Portfolio. pp. 141–142. ISBN 9781591841395.

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