This is a 64-bit 3-state random access read/write memory
The MM74C89 is a 64-bit 3-STATE random access read/write memory manufactured by Fairchild Semiconductor. It features a 16-word by 4-bit configuration with four address lines, four data input lines, and a write enable line. The device allows for easy memory expansion through its 3-STATE data output lines.
| Memory Configuration | 16-word by 4-bit |
|---|---|
| Supply Voltage Range | 3.0V to 15V |
| Power Dissipation (Typ) | 100 nW |
| Operating Temperature Range | -65°C to +150°C |
| Package Type | 16-Lead Plastic Dual-In-Line Package (PDIP) |
The MM74C89 is a 16-word by 4-bit random access read/write memory.
An internal address register latches the address information on the positive to negative transition of the memory enable input.
When the device is writing or disabled, the output assumes a 3-STATE (Hi-z) condition.