The 28LV64A is a 64K CMOS non-volatile electrically Erasable PROM from Microchip Technology Inc. It is organized as 8K words by 8 bits. The 28LV64A is accessed like a static RAM for the read or write cycles without the need of external components. During a “byte write”, the address and data are latched internally, freeing the microprocessor address and data bus for other operations. Fol- lowing the initiation of write cycle, the device will go to a busy state and automatically clear and write the latched data using an inter- nal control timer. To determine when the write operation has been completed, the user must periodically read the busy status bit. The device will automatically return to the ready state when the write operation is complete.
The 28LV64A is a low‑voltage CMOS EEPROM offering 64 K (8 K × 8) memory organized in a standard JEDEC pinout. It operates like a static RAM for read/write cycles, with automatic write timing and data‑polling features for reliable operation.
The document lists detailed electrical specifications, timing parameters, package variants, and operating modes such as read, standby, write‑inhibit, and byte‑write, along with temperature ranges and worldwide sales contacts.
| Supply Voltage | 2.7 V to 3.6 V |
|---|---|
| Read Access Time | 300 ns |
| Byte Write Time | 3 ms |
| Data Retention | >200 years |
| Endurance | ≥100 000 erase/write cycles |
| Standby Current | 50 µA |
| Active Current | 8 mA |
| Package Options | 28‑pin DIP, 32‑pin chip carrier, 28‑pin TSOP, 28‑pin VSOP |
| Commercial Temperature Range | 0 °C to +70 °C |
| Industrial Temperature Range | -40 °C to +85 °C |
It operates from 2.7 V to 3.6 V.
A byte write cycle takes 3 ms.
Commercial operation is specified from 0 °C to +70 °C.
The device is rated for at least 100 000 erase/write cycles.