400 KHz 2-Wire Serial E
2
PROM
64K
8K x 8 Bit
7026 3/27/97 T0/C0/D0 SH
Xicor, 1995, 1996 Patents Pending
Characteristics subject to change without notice
1
X24641
FUNCTIONAL DIAGRAM
FEATURES
1.8V to 3.6V, 2.5V to 5.5V and 4.5V to 5.5V
Power Supply Operation
Low Power CMOS
—Active Read Current Less Than 1mA
—Active Write Current Less Than 3mA
—Standby Current Less Than 1
400KHz Fast Mode 2-Wire Serial Interface
—Down to 1.8V
—Schmitt Trigger Input Noise Suppression
—Output Slope Control for Ground Bounce
Noise Elimination
Internally Organized 8K x 8
32 Byte Page Write Mode
—Minimizes Total Write Time Per Byte
Hardware Write Protect
Bidirectional Data Transfer Protocol
Self-Timed Write Cycle
—Typical Write Cycle Time of 5ms
High Reliability
—Endurance: 1,000,000 Cycles
—Data Retention: 100 Years
8-Lead SOIC
μ
A
DESCRIPTION
The X24641 is a CMOS Serial E
internally organized 8K x 8. The device features a
serial interface and software protocol allowing opera-
tion on a simple two wire bus. The bus operates at
400KHz all the way down to 1.8V.
2
PROM Memory,
Three device select inputs (S
devices to share a common two wire bus.
0
–S
2
) allow up to eight
Hardware Write Protection is provided through a Write
Protect (WP) input pin on the X24641. When the WP
pin is HIGH, the upper quadrant of the Serial E
array is protected against any nonvolatile write
attempts.
2
PROM
Xicor Serial E
tested for applications requiring extended endurance.
Inherent data retention is greater than 100 years.
2
PROM Memories are designed and
SERIAL E
2
PROM DATA
AND ADDRESS (SDA)
SCL
S2
S1
S0
WP
COMMAND
DECODE
AND
CONTROL
LOGIC
DEVICE
SELECT
LOGIC
WRITE
PROTECT
LOGIC
PAGE
DECODE
LOGIC
DATA REGISTER
Y DECODE LOGIC
E
2
PROM
ARRAY
8K x 8
WRITE VOLTAGE
CONTROL
7026 FM 01