A29L040A Series
512K X 8 Bit CMOS 3.0 Volt-only,
Uniform Sector Flash Memory
Preliminary
Features
ꢀSingle power supply operation
- Full voltage range: 2.7 to 3.6 volt read and write
operations for battery-powered applications
- Regulated voltage range: 3.0 to 3.6 volt read and write
operations for compatibility with high performance 3.3
volt microprocessors
- 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
ꢀAccess times:
- 70 (max.)
ꢀCurrent:
ꢀ20-year data retention at 125°C
- Reliable operation for the life of the system
ꢀCompatible with JEDEC-standards
- 4 mA typical active read current
- 20 mA typical program/erase current
- 200 nA typical CMOS standby
- 200 nA Automatic Sleep Mode current
ꢀFlexible sector architecture
- Pinout and software compatible with single-power-
supply Flash memory standard
- Superior inadvertent write protection
ꢀ
Polling and toggle bits
Data
- Provides a software method of detecting completion of
program or erase operations
- 8 uniform sectors of 64 Kbyte each
- Any combination of sectors can be erased
- Supports full chip erase
ꢀ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
- Sector protection:
A hardware method of protecting sectors to prevent
any inadvertent program or erase operations within that
sector
ꢀPackage options
- 32-pin DIP, PLCC, TSOP (8mm x 20mm), sTSOP
(8mm x 13.4mm), sTSOP (8mm x 14mm).
ꢀEmbedded Erase Algorithms
General Description
Commands are written to the command register using
standard microprocessor write timings. Register contents
serve as input to an internal state-machine that controls the
erase and programming circuitry. Write cycles also internally
latch addresses and data needed for the programming and
erase operations. Reading data out of the device is similar to
reading from other Flash or EPROM devices.
Device programming occurs by writing the proper program
command sequence. This initiates the Embedded Program
algorithm - an internal algorithm that automatically times the
program pulse widths and verifies proper program margin.
Device erasure occurs by executing the proper erase
command sequence. This initiates the Embedded Erase
The A29L040A is a 3.0 volt-only Flash memory organized as
524,288 bytes of 8 bits each. The 512 Kbytes of data are
further divided into eight sectors of 64 Kbytes each for
flexible sector erase capability. The 8 bits of data appear on
I/O0 - I/O7 while the addresses are input on A0 to A18. The
A29L040A is offered in 32-pin PLCC, TSOP (8mm x 20mm)
or sTSOP (8mm x 13.4mm) packages. This device is
designed to be programmed in-system with the standard
system 3.0 volt VCC supply. Additional 12.0 volt VPP is not
required for in-system write or erase operations. However,
the A29L040A can also be programmed in standard EPROM
programmers.
The A29L040A has a second toggle bit, I/O2, to indicate
whether the addressed sector is being selected for erase,
and also offers the ability to program in the Erase Suspend
mode. The standard A29L040A offers access times of 70ns,
allowing high-speed microprocessors to operate without wait
states. To eliminate bus contention the device has separate
algorithm
-
an internal algorithm that automatically
preprograms the array (if it is not already programmed)
before executing the erase operation. During erase, the
device automatically times the erase pulse widths and
verifies proper erase margin.
The host system can detect whether a program or erase
chip enable (
), write enable (
) and output enable
WE
CE
operation is complete by reading the I/O7 (
Polling) and
Data
(
) controls.
OE
I/O6 (toggle) status bits. After a program or erase cycle has
been completed, the device is ready to read array data or
accept another command.
The sector erase architecture allows memory sectors to be
erased and reprogrammed without affecting the data
The device requires only a single 3.0 volt power supply for
both read and write functions. Internally generated and
regulated voltages are provided for the program and erase
operations.
The A29L040A is entirely software command set compatible
with the JEDEC single-power-supply Flash standard.
PRELIMINARY (March, 2005, Version 0.0)
1
AMIC Technology, Corp.
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