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Xicor

X24641 Datasheet Preview

X24641 Datasheet

400 KHz 2-Wire Serial E 2 PROM

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64K
X24641
8K x 8 Bit
400 KHz 2-Wire Serial E2PROM
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 1µA
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
DESCRIPTION
The X24641 is a CMOS Serial E2PROM Memory,
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.
Three device select inputs (S0–S2) allow up to eight
devices to share a common two wire bus.
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 E2PROM
array is protected against any nonvolatile write
attempts.
Xicor Serial E2PROM Memories are designed and
tested for applications requiring extended endurance.
Inherent data retention is greater than 100 years.
FUNCTIONAL DIAGRAM
SERIAL E2PROM DATA
AND ADDRESS (SDA)
SCL
COMMAND
DECODE
AND
CONTROL
LOGIC
S2
DEVICE
S1 SELECT
LOGIC
S0
PAGE
DECODE
LOGIC
WRITE
PROTECT
LOGIC
DATA REGISTER
Y DECODE LOGIC
E2PROM
ARRAY
8K x 8
WRITE VOLTAGE
WP CONTROL
7026 FM 01
©Xicor, 1995, 1996 Patents Pending
7026 3/27/97 T0/C0/D0 SH
Characteristics subject to change without notice
1




Xicor

X24641 Datasheet Preview

X24641 Datasheet

400 KHz 2-Wire Serial E 2 PROM

No Preview Available !

X24641
PIN DESCRIPTIONS
Serial Clock (SCL)
The SCL input is used to clock all data into and out of
the device.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into
and out of the device. It is an open drain output and
may be wire-ORed with any number of open drain or
open collector outputs.
An open drain output requires the use of a pull-up
resistor. For selecting typical values, refer to the Pull-
up resistor selection graph at the end of this data
sheet.
Device Select (S0, S1, S2)
The device select inputs (S0, S1, S2) are used to set
the first three bits of the 8-bit slave address. This
allows up to eight devices to share a common bus.
These inputs can be static or actively driven. If used
statically they must be tied to VSS or VCC as appro-
priate. If actively driven, they must be driven with
CMOS levels.
Write Protect (WP)
The Write Protect input controls the Hardware Write
Protect feature. When held LOW, Hardware Write
Protection is disabled and the device can be written
normally. When this input is held HIGH, Write Protec-
tion is enabled, and nonvolatile writes are disabled to
the upper quadrant of the E2PROM array.
PIN NAMES
Symbol
S0, S1, S2
SDA
SCL
WP
VSS
VCC
PIN CONFIGURATION
Description
Device Select Inputs
Serial Data
Serial Clock
Write Protect
Ground
Supply Voltage
7026 FRM T01
8-LEAD SOIC
S0
S1
S2
VSS
18
27
X24641
36
45
VCC
WP
SCL
SDA
7026 FM 02
2


Part Number X24641
Description 400 KHz 2-Wire Serial E 2 PROM
Maker Xicor
Total Page 13 Pages
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