General Description

The A29400 is a 5.0 volt only Flash memory organized as 524,288 bytes of 8 bits or 262,144 words of 16 bits each. The A29400 offers the RESET function. The 512 Kbytes of data are further divided into eleven sectors for flexible sector erase capability. The 8 bits of data appear on I/O0 - I/O7 while the addresses are input on A1 to A17; the 16 bits of data appear on I/O0~I/O15. The A29400 is offered in 44-pin SOP and 48-Pin TSOP packages. This device is designed to be programmed insystem with the standard system 5.0 volt VCC supply. Additional 12.0 volt VPP is not required for in-system write or erase operations. However, the A29400 can also be programmed in standard EPROM programmers.

特性 Features

■ 5.0V ± 10 for read and write operations

■ Access times:

- 55/70/90 (max.)

■ Current:

- 20 mA typical active read current

- 30 mA typical program/erase current

- 1 mA typical CMOS standby

■ Flexible sector architecture

- 16 Kbyte/ 8 KbyteX2/ 32 Kbyte/ 64 KbyteX7 sectors

- 8 Kword/ 4 KwordX2/ 16 Kword/ 32 KwordX7 sectors

- Any combination of sectors can be erased

- Supports full chip erase

- Sector protection:

A hardware method of protecting sectors to prevent

any inadvertent program or erase operations within

that sector

■ Top or bottom boot block configurations available

■ Embedded Erase Algorithms

- Embedded Erase algorithm will automatically erase

the entire chip or any combination of designated

sectors and verify the erased sectors

- Embedded Program algorithm automatically writes

and verifies bytes at specified addresses

■ Typical 100,000 program/erase cycles per sector

■ 20-year data retention at 125°C

- Reliable operation for the life of the system

■ Compatible with JEDEC-standards

- Pinout and software compatible with single-powersupply Flash memory standard

- Superior inadvertent write protection

■ Data Polling and toggle bits

- Provides a software method of detecting completion

of program or erase operations

■ Erase Suspend/Erase Resume

- Suspends a sector erase operation to read data from,

or program data to, a non-erasing sector, then

resumes the erase operation

■ Hardware reset pin (RESET )

- Hardware method to reset the device to reading array

data

■ Package options

- 44-pin SOP or 48-pin TSOP (I)