General
|
General Information |
The COSMAC 1805 was a ROM-less version of the 1804. It’s primary use was for prototyping 1804 functions or for 1804 based systems with larger, external, memory requirements. It did include the 1804 RAM and Counter/Timer. |
|
Production |
3rd Quarter 1981 |
| Designers | Lead Designer: Joe Weisbecker, Team Lead: Jerry Herzog |
Architecture
| Type | Data Word | Address Space | Max Clock | Instruct- ions | Assists | Reg’s GP | Reg’s Math | Reg’s Index | IO Ports | Stack | Interrupts | Memory |
| MCU, CMOS | 8-bit | 64K | 4Mhz and 8Mhz | 113 | NA | 16×16-bit or 32×8-bit | 1 | NA | 8 | Ext RAM | 1 Level | 64B RAM |
Packages
|
Chip Name |
Package |
On-Chip Identification |
Picture |
General Comments |
| CDP1805D | white ceramic, silver lid, 40 gold side braised pins | CDP1805D | Standard operating range: 4V to10.5V. The ceramic “D” versions have an operating temperature range of -55o to 120oC | |
| CDP1805CD | white ceramic, silver lid, 40 gold side braised pins | CDP1805CD | “C” suffix versions have a lower voltage range: 4V to 6.5V. Max clock is limited to 4Mhz. | |
| CDP1805AD | white ceramic, silver lid, 40 gold side braised pins | CDP1805AD | ||
| CDP1805ACD | white ceramic, silver lid, 40 gold side braised pins | CDP1805ACD | ||
| CDP1805E | black plastic, 40 tin leads | CDP1805E | The plastic “E” versions have an operating temperature range of -40o to 85oC, | |
| CDP1805CE | black plastic, 40 tin leads | CDP1805CE | ||
| CDP1805AE | black plastic, 40 tin leads | CDP1805AE | ||
| CDP1805ACE | black plastic, 40 tin leads | CDP1805ACE | ||
| CDP1805AQ | black plastic QUIP, 44 tin leads | CDP1805AQ | The plastic QUIP “Q” versions have an operating temperature range of -40o to 85oC, | |
| CDP1805ACQ | black plastic QUIP, 44 tin leads | CDP1805ACQ |
Related Chips
|
Related Chips |
RCA 1801, RCA 1802, RCA 1804, RCA 1806 |
|
Second Sources |
None |
| Support Chips | 1852 (8-bit I/O Port), 1854 (UART), 1856 (4-bit memory buffer), 1857 (4-bit I/O buffer) |