AT29C020 is a 5-volt-only in-system Flash programmable and erasable read-only memory (PEROM) manufactured by Atmel. It has 2 megabits of memory organized as 262,144 bytes. The device offers access times to 70 ns with power dissipation of just 220 mW over the commercial temperature range. When the device is deselected, the CMOS standby current is less than 100 µA. Device endurance is such that any sector can typically be written to in excess of 10,000 times. To allow for simple in-system reprogrammability, the AT29C020 does not require high input voltages for programming. Five-volt-only commands determine the operation of the device. Reading data out of the device is similar to reading from an EPROM. Reprogramming the AT29C020 requires the use of special commands, which are explained in this document.
The AT29C020 is a 5‑volt‑only, in‑system programmable flash memory offering 2 megabits (262 kB) of storage. It provides fast 70 ns read access, low power dissipation (220 mW), and endurance of over 10 000 write cycles. The device includes two 8 KB boot blocks with lockout capability and supports both hardware and software data protection.
The document lists the 32‑lead PLCC and TSOP pin configurations, block diagram, and detailed timing for read, program, and erase operations. Electrical specifications such as active current, standby current, supply voltage tolerance, and temperature range are provided, along with operating modes, chip‑erase procedures, and identification features.
| Read Access Time | 70 ns |
|---|---|
| Active Current | 40 mA |
| Standby Current | 100 pA |
| Endurance | >10,000 cycles |
| Supply Voltage | 5 V ±10% |
| Number of Sectors | 1024 (256 B each) |
| Boot Block Size | 8 KB each |
| Operating Temperature Range | -55 °C to +125 °C |
| Power Dissipation | 220 mW |
The AT29C020 provides a fast read access time of 70 ns.
The device contains 1024 sectors, each 256 bytes in size.
The standby current is 100 pA (CMOS).
It operates from a 5 V supply with a ±10 % tolerance.