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X24F128 Datasheet Preview

X24F128 Datasheet

2-Wire SerialFlash with Block Lock TM Protection

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APPLICATION NOTE
A V A I LABLE
AN84
128K
X24F128
16K x 8 Bit
2-Wire SerialFlash with Block LockTM Protection
FEATURES
Save Critical Data With Programmable
Block Lock Protection
—Block Lock (0, 1/4, 1/2, or all of E2PROM Array)
—Software Program Protection
—Programmable Hardware Program Protect
In Circuit Programmable ROM Mode
Longer Battery Life With Lower Power
—Active Read Current Less Than 1mA
—Active Program Current Less Than 3mA
—Standby Current Less Than 1µA
1.8V to 3.6V or 5V “Univolt” Read and
Program Power Supply Versions
32 Word Sector Program Mode
—Minimizes Total Program Time Per Word
100KHz 2-Wire Serial Interface
Internally Organized 16K x 8
Bidirectional Data Transfer Protocol
Self-Timed Program Cycle
—Typical Program Cycle Time of 5ms
High Reliability
—Endurance: 100,000 Cycles
—Data Retention: 100 Years
8-Lead DIP
16-Lead SOIC
DESCRIPTION
The X24F128 is a CMOS SerialFlash Memory, inter-
nally organized 16K x 8. The device features a serial
interface and software protocol allowing operation on a
simple two wire bus.
Three device select inputs (S0–S2) allow up to eight
devices to share a common two wire bus.
A Program Protect Register at the address location
FFFFh provides three program protection features:
Software Program Protect, Block Lock Protect, and
Hardware Program Protect. The Software Program
Protect feature prevents any nonvolatile writes to the
device until the PEL bit in the Program Protect
Register is set. The Block Lock Protection feature
allows the user to individually block protect four blocks
of the array by programming two bits in the Program
Protect Register. The Programmable Hardware
Program Protect feature allows the user to install the
device with PP tied to VCC, program the entire memory
array in circuit, and then enable the hardware program
protection by programming a PPEN bit in the Program
Protect Register. After this, selected blocks of the
array, including the Program Protect Register itself, are
permanently protected from being erased.
FUNCTIONAL DIAGRAM
SERIALFLASH DATA
AND ADDRESS (SDA)
SCL
COMMAND
DECODE
AND
CONTROL
LOGIC
SECTOR
DECODE
LOGIC
BLOCK LOCK AND
PROGRAM PROTECT
CONTROL LOGIC
S2
DEVICE
S1 SELECT
LOGIC
S0
PROGRAM
PROTECT
REGISTER
DATA REGISTER
Y DECODE LOGIC
SERIALFLASH
ARRAY
16K x 8
4K x 8
4K x 8
8K x 8
PP
©Xicor, 1995, 1996 Patents Pending
7012-0.8 11/25/96 T1/C0/D0 SH
PROGRAM VOLTAGE
CONTROL
7012 ILL F01.4
Characteristics subject to change without notice
1




Xicor

X24F128 Datasheet Preview

X24F128 Datasheet

2-Wire SerialFlash with Block Lock TM Protection

No Preview Available !

X24F128
Xicor SerialFlash Memories are designed and tested
for applications 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.
Program Protect (PP)
The Program Protect input controls the Hardware
Program Protect feature. When held LOW, hardware
program protection is disabled and the device can be
programmed normally. When this input is held HIGH,
and the PPEN bit in the Program Protect Register is
set HIGH, program protection is enabled, and nonvola-
tile writes are disabled to the selected blocks as well
as the Program Protect Register itself.
PIN NAMES
Symbol
S0, S1, S2
SDA
SCL
PP
VSS
VCC
NC
PIN CONFIGURATION
Description
Device Select Inputs
Serial Data
Serial Clock
Program Protect
Ground
Supply Voltage
No Connect
7012 FRM T01
S0
S1
S2
VSS
8-LEAD DIP
18
27
X24F128
36
45
VCC
PP
SCL
SDA
S0
S1
NC
NC
NC
NC
S2
VSS
16-LEAD SOIC
1 16
2 15
3 14
4 13
X24F128
5 12
6 11
7 10
89
VCC
PP
NC
NC
NC
NC
SCL
SDA
7012 ILL F02.1
2


Part Number X24F128
Description 2-Wire SerialFlash with Block Lock TM Protection
Maker Xicor
Total Page 16 Pages
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