512 Kilobit (64K x 8) Page Mode EEPROM
SST29EE512A / SST29LE512A / SST29VE512A
Data Sheet
FEATURES:
• Single Voltage Read and Write Operations
– 5.0V-only for SST29EE512A
– 3.0-3.6V for SST29LE512A
– 2.7-3.6V for SST29VE512A
• Superior Reliability
– Endurance: 100,000 Cycles (typical)
– Greater than 100 years Data Retention
• Low Power Consumption
– Active Current: 20 mA (typical) for 5V and
10 mA (typical) for 3.0/2.7V
– Standby Current: 10 µA (typical)
• Fast Page Write Operation
– 128 Bytes per Page, 512 Pages
– Page Write Cycle: 5 ms (typical)
– Complete Memory Rewrite: 2.5 sec (typical)
– Effective Byte Write Cycle
Time: 39 µs (typical)
• Fast Read Access Time
– 5.0V-only operation: 70 and 90 ns
– 3.0-3.6V operation: 150 and 200 ns
– 2.7-3.6V operation: 200 and 250 ns
• Latched Address and Data
• Automatic Write Timing
– Internal V
PP
Generation
• End of Write Detection
– Toggle Bit
– Data# Polling
• Hardware and Software Data Protection
• TTL I/O Compatibility
• JEDEC Standard
– Flash EEPROM Pinouts and command sets
• Packages Available
– 32 Pin PDIP
– 32-Pin PLCC
– 32-Pin TSOP (8mm x 20mm)
The SST29EE512A/29LE512A/29VE512A are suited
for applications that require convenient and economical
updating of program, configuration, or data memory. For
all system applications, the SST29EE512A/29LE512A/
29VE512A significantly improve performance and reli-
ability, while lowering power consumption. The
SST29EE512A/29LE512A/29VE512A improve flexibil-
ity while lowering the cost for program, data, and configu-
ration storage applications.
To meet high density, surface mount requirements, the
SST29EE512A/29LE512A/29VE512A are offered in 32-
pin TSOP and 32-lead PLCC packages. A 600-mil, 32-
pin PDIP package is also available. See Figures 1 and 2
for pinouts.
Device Operation
The SST page mode EEPROM offers in-circuit electrical
write capability. The SST29EE512A/29LE512A/
29VE512A do not require separate Erase and Program
operations. The internally timed write cycle executes
both erase and program transparently to the user.
The SST29EE512A/29LE512A/29VE512A have indus-
try standard Software Data Protection. The
SST29EE512A/29LE512A/29VE512A are compatible
with industry standard EEPROM pinouts and
functionality.
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PRODUCT DESCRIPTION
The SST29EE512A/29LE512A/29VE512A are 64K x 8
CMOS, Page Write EEPROMs manufactured with
SST’s proprietary, high performance CMOS SuperFlash
technology. The split-gate cell design and thick oxide
tunneling injector attain better reliability and
manufacturability compared with alternate approaches.
The SST29EE512A/29LE512A/29VE512A write with a
single power supply. Internal Erase/Program is transpar-
ent to the user. The SST29EE512A/29LE512A/
29VE512A conform to JEDEC standard pinouts for byte-
wide memories.
Featuring high performance page write, the
SST29EE512A/29LE512A/29VE512A provide a typical
byte-write time of 39 µsec. The entire memory, i.e., 64
KBytes, can be written page-by-page in as little as 2.5
seconds, when using interface features such as Toggle
Bit or Data# Polling to indicate the completion of a write
cycle. To protect against inadvertent write, the
SST29EE512A/29LE512A/29VE512A have on-chip
hardware and software data protection schemes. De-
signed, manufactured, and tested for a wide spectrum of
applications, the SST29EE512A/29LE512A/29VE512A
are offered with a guaranteed page write endurance of
10
4
cycles. Data retention is rated at greater than 100
years.
© 1999 Silicon Storage Technology, Inc. The SST logo and SuperFlash are registered trademarks of Silicon Storage Technology, Inc. These specifications are subject to change without notice.
302-01 2/99
1
512 Kilobit Page Mode EEPROM
SST29EE512A / SST29LE512A / SST29VE512A
Read
The Read operations of the the SST29EE512A/
29LE512A/29VE512A are controlled by CE# and OE#,
both have to be low for the system to obtain data from the
outputs. CE# is used for device selection. When CE# is
high, the chip is deselected and only standby power is
consumed. OE# is the output control and is used to gate
data from the output pins. The data bus is in high
impedance state when either CE# or OE# is high.
Refer to the read cycle timing diagram for further details
(Figure 3).
Write
The Page Write to the SST29EE512A/29LE512A/
29VE512A uses the JEDEC Standard Software Data
Protection (SDP) three-byte command sequence.
The Write operation consists of three steps. Step 1 is the
three-byte load sequence for Software Data Protection.
Step 2 is the byte-load cycle to a page buffer of the
SST29EE512A/29LE512A/29VE512A. Steps 1 and 2
use the same timing for both operations. Step 3 is an
internally controlled write cycle for writing the data loaded
in the page buffer into the memory array for nonvolatile
storage. During both the SDP three-byte load sequence
and the byte-load cycle, the addresses are latched by the
falling edge of either CE# or WE#, whichever occurs last.
The data is latched by the rising edge of either CE# or
WE#, whichever occurs first. The internal write cycle is
initiated by the T
BLCO
timer after the rising edge of WE#
or CE#, whichever occurs first. The write cycle, once
initiated, will continue to completion, typically within 5 ms.
See Figures 4 and 5 for WE# and CE# controlled page
write cycle timing diagrams and Figures 13 and 15 for
flowcharts.
The Write operation has three functional cycles: the
Software Data Protection load sequence, the page load
cycle, and the internal write cycle. The Software Data
Protection consists of a specific three-byte load se-
quence that allows writing to the selected page and will
leave the SST29EE512A/29LE512A/29VE512A pro-
tected at the end of the Page Write. The page load cycle
consists of loading 1 to 128 bytes of data into the page
buffer. The internal write cycle consists of the T
BLCO
time-out and the write timer operation. During the Write
operation, the only valid reads are Data# Polling and
Toggle Bit.
The Page Write operation allows the loading of up to 128
bytes of data into the page buffer of the SST29EE512A/
29LE512A/29VE512A before the initiation of the internal
write cycle. During the internal write cycle, all the data in
the page buffer is written simultaneously into the memory
array. Hence, the page write feature of SST29EE512A/
29LE512A/29VE512A allows the entire memory to be
written in as little as 2.5 seconds. During the internal write
cycle, the host is free to perform additional tasks, such as
to fetch data from other locations in the system to set up
the write to the next page. In each Page Write operation,
all the bytes that are loaded into the page buffer must
have the same page address, i.e. A
7
through A
16
. Any
byte not loaded with user data will be written to FF.
See Figures 4 and 5 for the page write cycle timing
diagrams. If after the completion of the three-byte SDP
load sequence, the host loads a byte into the page buffer
within a byte-load cycle time (T
BLC
) of 100 µs, the
SST29EE512A/29LE512A/29VE512A will stay in the
page load cycle. Additional bytes are then loaded con-
secutively. The page load cycle will be terminated if no
additional byte is loaded into the page buffer within 200
µs (T
BLCO
) from the last byte-load cycle, i.e., no sub-
sequent WE# or CE# high-to-low transition after the last
rising edge of WE# or CE#. Data in the page buffer can
be changed by a subsequent byte-load cycle. The page
load period can continue indefinitely, as long as the host
continues to load the device within the byte-load cycle
time of 100 µs. The page to be loaded is determined by
the page address of the last byte loaded.
Software Chip Erase
The SST29EE512A/29LE512A/29VE512A provide a
Chip Erase operation, which allows the user to simulta-
neously clear the entire memory array to the “1” state.
This is useful when the entire device must be quickly
erased.
The Software Chip Erase operation is initiated by using
a specific six-byte load sequence. After the load se-
quence, the device enters into an internally timed cycle
similar to the write cycle. During the Erase operation, the
only valid read is Toggle Bit. See Table 4 for the load
sequence, Figure 8 for timing diagram, and Figure 17 for
the flowchart.
© 1999 Silicon Storage Technology, Inc.
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302-01 2/99
512 Kilobit Page Mode EEPROM
SST29EE512A / SST29LE512A / SST29VE512A
Write Operation Status Detection
The SST29EE512A/29LE512A/29VE512A provide two
software means to detect the completion of a write cycle,
in order to optimize the system write cycle time. The
software detection includes two status bits: Data# Polling
(DQ
7
) and Toggle Bit (DQ
6
). The end of write detection
mode is enabled after the rising WE# or CE# whichever
occurs first, which initiates the internal write cycle.
The actual completion of the nonvolatile write is asyn-
chronous with the system; therefore, either a Data#
Polling or Toggle Bit read may be simultaneous with the
completion of the write cycle. If this occurs, the system
may possibly get an erroneous result, i.e., valid data may
appear to conflict with either DQ
7
or DQ
6
. In order to
prevent spurious rejection, if an erroneous result occurs,
the software routine should include a loop to read the
accessed location an additional two (2) times. If both
reads are valid, then the device has completed the write
cycle, otherwise the rejection is valid.
Data# Polling (DQ
7
)
When the SST29EE512A/29LE512A/29VE512A are in
the internal write cycle, any attempt to read DQ
7
of the
last byte loaded during the byte-load cycle will receive
the complement of the true data. Once the write cycle is
completed, DQ
7
will show true data. The device is then
ready for the next operation. See Figure 6 for Data#
Polling timing diagram and Figure 14 for a flowchart.
Toggle Bit (DQ
6
)
During the internal write cycle, any consecutive attempts
to read DQ
6
will produce alternating 0’s and 1’s, i.e.,
toggling between 0 and 1. When the write cycle is
completed, the toggling will stop. The device is then
ready for the next operation. See Figure 7 for Toggle Bit
timing diagram and Figure 14 for a flowchart. The initial
read of the Toggle Bit will typically be a “1”.
Data Protection
The SST29EE512A/29LE512A/29VE512A provide both
hardware and software features to protect nonvolatile
data from inadvertent writes.
Hardware Data Protection
Noise/Glitch Protection: A WE# or CE# pulse of less than
5 ns will not initiate a write cycle.
V
CC
Power Up/Down Detection: The write operation is
inhibited when V
CC
is less than 2.5V.
Write Inhibit Mode: Forcing OE# low, CE# high, or WE#
high will inhibit the write operation. This prevents inad-
vertent writes during power-up or power-down.
Software Data Protection (SDP)
The SST29EE512A/29LE512A/29VE512A provide the
JEDEC approved software data protection scheme for
all data alteration operations, i.e., Write and Chip Erase.
With this scheme, any Write operation requires the
inclusion of a series of three byte-load operations to
precede the data loading operation. The three byte-load
sequence is used to initiate the write cycle, providing
optimal protection from inadvertent write operations,
e.g., during the system power-up or power-down.
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10
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© 1999 Silicon Storage Technology, Inc.
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512 Kilobit Page Mode EEPROM
SST29EE512A / SST29LE512A / SST29VE512A
Product Identification
The product identification mode identifies the device as
the SST29EE512A/29LE512A/29VE512A and manu-
facturer as SST. This mode may be accessed by hard-
ware or software operations. The hardware operation is
typically used by a programmer to identify the correct
algorithm for the SST29EE512A/29LE512A/29VE512A.
Users may wish to use the software product identification
operation to identify the part (i.e., using the device code)
when using multiple manufacturers in the same socket.
For details, see Table 3 for hardware operation or Table
4 for software operation, Figure 9 for the software ID
entry and read timing diagram and Figure 16 for the ID
entry command sequence flowchart. The manufacturer
and device codes are the same for both operations.
T
ABLE
1: P
RODUCT
I
DENTIFICATION
T
ABLE
Byte
Manufacturer’s Code
0000 H
SST29EE512A Device Code
0001 H
SST29LE512A Device Code
0001 H
SST29VE512A Device Code
0001 H
Product Identification Mode Exit
In order to return to the standard read mode, the Soft-
ware Product Identification mode must be exited. Exiting
is accomplished by issuing the Software ID Exit (reset)
operation, which returns the device to the Read opera-
tion. The Reset operation may also be used to reset the
device to the read mode after an inadvertent transient
condition that apparently causes the device to behave
abnormally, e.g., not read correctly. See Table 4 for
software command codes, Figure 10 for timing wave-
form and Figure 16 for a flowchart.
Data
BF H
20 H
21 H
21 H
302 PGM T1.1
F
UNCTIONAL
B
LOCK
D
IAGRAM OF
SST 29EE512A/29LE512A/29VE512A
X-Decoder
524,288 Bit
EEPROM
Cell Array
A15 - A0
Address Buffer & Latches
Y-Decoder and Page Latches
CE#
OE#
WE#
Control Logic
I/O Buffers and Data Latches
DQ7 - DQ0
302 ILL B1.0
© 1999 Silicon Storage Technology, Inc.
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302-01 2/99
512 Kilobit Page Mode EEPROM
SST29EE512A / SST29LE512A / SST29VE512A
A11
A9
A8
A13
A14
NC
WE#
VCC
NC
NC
A15
A12
A7
A6
A5
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Standard Pinout
Top View
Die Up
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
OE#
A10
CE#
DQ7
DQ6
DQ5
DQ4
DQ3
VSS
DQ2
DQ1
DQ0
A0
A1
A2
A3
302 ILL F01.0
1
2
3
4
5
F
IGURE
1: P
IN
A
SSIGNMENTS FOR
32-
PIN
TSOP P
ACKAGES
WE#
VCC
A12
A15
NC
NC
NC
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
VSS
NC
NC
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
32-Pin
6
PDIP
7
8
Top View
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VCC
WE#
NC
A14
A13
A8
A9
A11
OE#
A10
CE#
DQ7
DQ6
DQ5
DQ4
DQ3
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
5
6
7
8
9
10
11
12
13
4
3
2
1
32 31 30
29
28
27
26
25
24
23
22
6
A14
A13
A8
A9
A11
OE#
A10
CE#
DQ7
7
8
9
302 ILL F02.0
32-Lead PLCC
Top View
21
14 15 16 17 18 19 20
10
11
F
IGURE
2: P
IN
A
SSIGNMENTS FOR
32-
PIN
P
LASTIC
DIP
S AND
32-
LEAD
PLCC
S
T
ABLE
2: P
IN
D
ESCRIPTION
Symbol
Pin Name
A
15
-A
7
Row Address Inputs
A
6
-A
0
DQ
7
-DQ
0
Column Address
Inputs
Data Input/output
Functions
To provide memory addresses. Row addresses define a page for
a write cycle.
Column Addresses are toggled to load page data.
To output data during read cycles and receive input data during write
cycles. Data is internally latched during a write cycle. The outputs are in
tri-state when OE# or CE# is high.
To activate the device when CE# is low.
To gate the data output buffers.
To control the write operations
To provide 5-volt supply (± 10%) for the SST29EE512A, 3-volt supply
(3.0-3.6V) for the SST29LE512A, and 2.7-volt supply (2.7-3.6V) for the
SST29VE512A
Unconnected pins.
302 PGM T2.0
12
13
14
15
16
CE#
OE#
WE#
V
cc
Chip Enable
Output Enable
Write Enable
Power Supply
V
ss
NC
Ground
No Connection
© 1999 Silicon Storage Technology, Inc.
5
302-01 2/99
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