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Features
= Saifun NROM™ Flash Cell
= Serial Peripheral Interface (SPI) Compatible
= Supports SPI Modes 0 (0,0) and 3 (1,1)
= Byte and Page Write Modes (up to 128 bytes)
= Single Supply Voltage:
2.7V to 3.6V (L)
4.5V to 5.5V (H)
= 10MHz Clock Rate
= Block Write Protection:
Protect ¼, ½, or Entire Array
= Write Protect Pin and Write Disable Instructions of both Hardware and
Software Data Protection
= Self-timed Write Cycle (10mS max)
= 100,000 Write Cycles (Minimum)
= 20 Year Data Retention
= Low-power Standby Current (less than 1µA)
= 8-SOIC Narrow Package (0.150” Wide Body, JEDEC SOIC)
= Temperature Range:
Industrial: -40°C to +85°C
Commercial: 0°C to +70°C
SA25C1024
Data Sheet
1Mb EEPROM SPI
with 10MHz and Low
Standby
General Description
SA25C1024 is a 1Mb CMOS non-volatile serial EEPROM,
organized as a 128K x 8-bit memory. The SA25C1024 is
available in a space-saving, 8-lead narrow SOIC package. In
addition, it is available in a wide range of voltages – 2.7-3.6 V
and 4.5-5.5 V.
The SA25C1024 is enabled through the Chip Select (CSb) pin
and is accessed via a 3-wire interface consisting of Serial Data
Input (SI), Serial Data Output (SO) and Serial Data Clock
(SCK). All write cycles are completely self-timed, and no
separate ERASE cycle is required before write.
(continued)
http://www.saifun.com
Saifun NROMTM is a trademark of Saifun Semiconductors Ltd.
This Data Sheet states Saifun's current technical specifications regarding the Products described herein. This Data Sheet
may be revised by subsequent versions or modifications due to changes in technical specifications.
Publication# 1910 Rev: 1.1 Amendment: 1
Issue Date: January 27, 2003

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Table of Contents
Features ......................................................................... 1
General Description ...................................................... 1
Ordering Information .................................................... 5
Product Specifications ................................................. 6
Absolute Maximum Ratings..................................... 6
Latch Up Specifications........................................... 6
ESD Specifications.................................................. 6
Operating Conditions............................................... 6
DC Characteristics ........................................................ 7
AC Test Conditions ....................................................... 8
Serial Interface Description .......................................... 9
Master ..................................................................... 9
Slave ....................................................................... 9
Transmitter/Receiver ............................................... 9
Serial Opcode ......................................................... 9
Invalid Opcode ........................................................ 9
Chip Select (CSb).................................................... 9
HOLDb .................................................................... 9
Write Protect ........................................................... 9
Functional Description ............................................... 10
Write Enable (WREN) ........................................... 10
Write Disable (WRDI)............................................ 10
Read Status Register (RDSR) ............................... 11
Write Status Register (WRSR) .............................. 11
Read Sequence (READ) ....................................... 11
Write Sequence (WRITE)...................................... 12
Timing Diagrams ......................................................... 13
Physical Dimensions .................................................. 16
Life Support Policy...................................................... 19
SA25C1024 Data Sheet
SAIFUN
2
List of Figures
Figure 1. SOIC 8 – Narrow/PDIP Package (Top View) .... 4
Figure 2: SA25C1024 Ordering Information..................... 5
Figure 3. AC Measurements I/O Waveform..................... 8
Figure 4. SPI Serial Interface ........................................ 10
Figure 5. SPI Mode 0 (0,0) Timing................................. 13
Figure 6. SPI Mode 0 (0,0) and 3 (1,1) Timing............... 13
Figure 7. HOLDb Timing ............................................... 14
Figure 8. Read Timing................................................... 14
Figure 9. Write Timing................................................... 14
Figure 10. Write Status Register Timing........................ 15
Figure 11. Read Status Register Timing........................ 15
Figure 12. 8-pin SOIC Package..................................... 16
Figure 13. 8-pin Molded Small Outline Package (MN),
0.150” Wide Body, JEDEC SOIC......................... 17
Figure 14. Molded Dual-in-line Package (N) Package
Number N08E...................................................... 18
List of Tables
Table 1. Pin Names......................................................... 4
Table 2. DC Characteristics............................................. 7
Table 3. AC Measurements............................................. 8
Table 4. AC Characteristics............................................. 8
Table 5. Instruction Set ................................................. 10
Table 6. Status Register Format.................................... 10
Table 7. Block Write Protect Bits................................... 11
Table 8. WPBEN Operation .......................................... 11
Table 9. Read Status Register Definition....................... 12

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General Description
(continued)
Programming the status register with top
¼, top ½ or entire array write protection
enables BLOCK WRITE protection.
Separate program enable and program
disable instructions are provided for
additional data protection. Hardware data
protection is provided via the WPb pin to
protect against inadvertent write attempts
to the status register. The HOLDb pin may
be used to suspend any serial
communication without resetting the serial
sequence.
SA25C1024 Data Sheet
SAIFUN
3

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Connection Diagrams
SA25C1024 Data Sheet
SAIFUN
4
CSb
SO
WPb
GND
18
27
SA25C1024
36
45
VCC
HOLD
SCK
SI
Figure 1. SOIC 8 – Narrow/PDIP Package (Top View)
Table 1. Pin Names
Pin Name
CSb
SCK
SI
SO
GND
VCC
WPb
HOLDb
Function
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Power Supply
Write Protect
Suspend Serial Input

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Ordering Information
SA25C1024 Data Sheet
SAIFUN
5
SA 25 C XX L
E YY X
Letter
Blank
X
Package N
MN
Description
Tube
Tape and Reel
8-pin DIP
8-pin SOIC (SO8, 150 mil width)
Temp. Range Blank
E
0 to 70 oC
-40 to +85 oC
Voltage Operating Range L
H
Density 1024
C
Interface 25
SA
Figure 2: SA25C1024 Ordering Information
2.7 V to 3.6 V
4.5 V to 5.5 V
1024 Kb with Write Protect
CMOS Technology
SPI-2 Wires
Saifun Non-Volatile
Memory