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X24320 Datasheet Preview

X24320 Datasheet

400KHz 2-Wire Serial E2PROM with Block Lock

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32K
X24320
4K x 8 Bit
400KHz 2-Wire Serial E2PROM with Block LockTM
FEATURES
Save Critical Data with Programmable
Block Lock Protection
—Block Lock (0, 1/4, 1/2, or all of E2PROM Array)
—Software Write Protection
—Programmable Hardware Write Protect
In Circuit Programmable ROM Mode
400KHz 2-Wire Serial Interface
—Schmitt Trigger Input Noise Suppression
—Output Slope Control for Ground Bounce
Noise Elimination
Longer Battery Life With Lower Power
—Active Read Current Less Than 1mA
—Active Write Current Less Than 3mA
—Standby Current Less Than 1µA
1.8V to 3.6V, 2.5V to 5.5V and 4.5V to 5.5V
Power Supply Versions
32 Word Page Write Mode
—Minimizes Total Write Time Per Word
Internally Organized 4K x 8
Bidirectional Data Transfer Protocol
Self-Timed Write Cycle
—Typical Write Cycle Time of 5ms
High Reliability
—Endurance: 100,000 Cycles
—Data Retention: 100 Years
8-Lead SOIC
14-Lead TSSOP
8-Lead PDIP
FUNCTIONAL DIAGRAM
DESCRIPTION
The X24320 is a CMOS Serial E2PROM, internally
organized 4K x 8. The device features a serial inter-
face and software protocol allowing operation on a
simple two wire bus. The bus operates at 400 KHz 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.
A Write Protect Register at the highest address loca-
tion, FFFFh, provides three write protection features:
Software Write Protect, Block Lock Protect, and
Programmable Hardware Write Protect. The Software
Write Protect feature prevents any nonvolatile writes to
the device until the WEL bit in the Write Protect
Register is set. The Block Lock Protection feature
gives the user four array block protect options, set by
programming two bits in the Write Protect Register.
The Programmable Hardware Write Protect feature
allows the user to install the device with WP tied to
VCC, write to and Block Lock the desired portions of
the memory array in circuit, and then enable the In
Circuit Programmable ROM Mode by programming the
WPEN bit HIGH in the Write Protect Register. After
this, the Block Locked portions of the array, including
the Write Protect Register itself, are permanently
protected from being erased.
SERIAL E2PROM DATA
AND ADDRESS (SDA)
DATA REGISTER
Y DECODE LOGIC
SCL
S2
S1
S0
COMMAND
DECODE
AND
CONTROL
LOGIC
BLOCK LOCK AND
WRITE PROTECT
CONTROL LOGIC
PAGE
DECODE
LOGIC
DEVICE
SELECT
LOGIC
WRITE
PROTECT
REGISTER
SERIAL E2PROM
ARRAY
4K x 8
1K x 8
1K x 8
2K x 8
WP
©Xicor, 1995, 1996 Patents Pending
7035-1.2 4/25/97 T0/C2/D0 SH
WRITE VOLTAGE
CONTROL
7035 FM 01
Characteristics subject to change without notice
1




Xicor

X24320 Datasheet Preview

X24320 Datasheet

400KHz 2-Wire Serial E2PROM with Block Lock

No Preview Available !

X24320
Xicor E2PROMs are designed and tested for applica-
tions requiring extended endurance. Inherent data
retention is greater than 100 years.
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 (driven to VCC or VSS).
Write Protect (WP)
The Write Protect input controls the Hardware Write
Protect feature. When held LOW, Hardware Write
Protection is disabled. When this input is held HIGH,
and the WPEN bit in the Write Protect Register is set
HIGH, the Write Protect Register is protected,
preventing changes to the Block Lock Protection and
WPEN bits.
PIN NAMES
Symbol
S0, S1, S2
SDA
SCL
WP
VSS
VCC
NC
PIN CONFIGURATION
Description
Device Select Inputs
Serial Data
Serial Clock
Write Protect
Ground
Supply Voltage
No Connect
7035 FM T01
* .197”
S0
S1
S2
VSS
8-Lead DIP/SOIC
18
27
X24320
36
45
Not to scale
VCC
WP
SCL
SDA
* .244”
.200”
S0
S1
NC
NC
NC
S2
VSS
14-Lead TSSOP
1 14
2 13
3 12
4 X24320 11
5 10
69
78
.252”
VCC
WP
NC
NC
NC
SCL
SDA
* SOIC Measurement
7035 FM 02
2


Part Number X24320
Description 400KHz 2-Wire Serial E2PROM with Block Lock
Maker Xicor
Total Page 17 Pages
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