A29040 Series
512K X 8 Bit CMOS 5.0 Volt-only,
Uniform Sector Flash Memory
Preliminary
Features
- Embedded Program algorithm automatically writes
and verifies bytes at specified addresses
nTypical 100,000 program/erase cycles per sector
n20-year data retention at 125°C
n5.0V ± 10% for read and write operations
nAccess times:
- 55/70/90/120/150 (max.)
nCurrent:
- 20 mA typical active read current
- 30 mA typical program/erase current
- 1 mA typical CMOS standby
- Reliable operation for the life of the system
nCompatible with JEDEC-standards
- Pinout and software compatible with single-power-
supply Flash memory standard
nFlexible sector architecture
- Superior inadvertent write protection
- 8 uniform sectors of 64 Kbyte each
- Any combination of sectors can be erased
- Supports full chip erase
n
Polling and toggle bits
Data
- Provides a software method of detecting completion
of program or erase operations
- Sector protection:
A hardware method of protecting sectors to prevent
any inadvertent program or erase operations within
that sector
nErase 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
nEmbedded Erase Algorithms
- Embedded Erase algorithm will automatically erase
the entire chip or any combination of designated
sectors and verify the erased sectors
nPackage options
- 32-pin P-DIP, PLCC, or TSOP(Forward type)
General Description
The A29040 is a 5.0 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 A29040 is offered in 32-pin PLCC, TSOP, and PDIP
packages. This device is designed to be programmed in-
system 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 A29040 can also be
programmed in standard EPROM programmers.
The A29040 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 A29040 offers access times of 55, 70,
90, 120, and 150 ns, allowing high-speed microprocessors
to operate without wait states. To eliminate bus contention
The A29040 is entirely software command set compatible
with the JEDEC single-power-supply Flash standard.
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
algorithm
- an internal algorithm that automatically
the device has separate chip enable (
), write enable
CE
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.
(
) and output enable (
OE
) controls.
WE
The device requires only a single 5.0 volt power supply for
both read and write functions. Internally generated and
regulated voltages are provided for the program and erase
operations.
PRELIMINARY
(August, 2001, Version 0.5)
1
AMIC Technology, Inc.
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