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X24645 Datasheet Preview

X24645 Datasheet

Advanced 2-Wire Serial E 2 PROM with Block Lock TM Protection

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Preliminary Information
64K
X24645
8192 x 8 Bit
Advanced 2-Wire Serial E2PROM with Block LockTM Protection
FEATURES
2.7V to 5.5V Power Supply
Low Power CMOS
—Active Read Current Less Than 1mA
—Active Write Current Less Than 3mA
—Standby Current Less Than 1µA
Internally Organized 8192 x 8
New Programmable Block Lock Protection
—Software Write Protection
—Programmable hardware Write Protect
Block Lock (0, 1/4, 1/2, or all of the E2PROM
array)
2 Wire Serial Interface
Bidirectional Data Transfer Protocol
32 Byte Page Write Mode
—Minimizes Total Write Time Per Byte
Self Timed Write Cycle
—Typical Write Cycle Time of 5ms
High Reliability
—Endurance: 100,000 Cycles
—Data Retention: 100 Years
Available Packages
—8-Lead PDIP
—8-Lead SOIC (JEDEC)
—14-Lead SOIC (JEDEC)
—20-Lead TSSOP
DESCRIPTION
The X24645 is a CMOS 65,536-bit serial E2PROM,
internally organized 8192 x 8. The X24645 features a
serial interface and software protocol allowing opera-
tion on a simple two wire bus.
Two device select inputs (S1, S2) allow up to four
devices to share a common two wire bus.
A Write Protect Register at the highest address loca-
tion, 1FFFh, provides three new write protection
features: Software Write Protect, Block Write Protect,
and Hardware Write Protect. The Software Write
Protect feature prevents any nonvolatile writes to the
X24645 until the WEL bit in the write protect register is
set. The Block Write Protection feature allows the user
to individually write protect four blocks of the array by
programming two bits in the write protect register. The
Programmable Hardware Write Protect feature allows
the user to install the X24645 with WP tied to VCC,
program the entire memory array in place, and then
enable the hardware write protection by programming
a WPEN bit in the write protect register. After this,
selected blocks of the array, including the write protect
register itself, are permanently write protected, as long
as WP remains HIGH.
FUNCTIONAL DIAGRAM
WP
VCC
VSS
SDA
START
STOP
LOGIC
START CYCLE
H.V. GENERATION
TIMING &
CONTROL
WRITE PROTECT
REGISTER AND
LOGIC
SCL
S2
S1
SLAVE ADDRESS
REGISTER
+COMPARATOR
CONTROL
LOGIC
LOAD
INC
WORD
ADDRESS
COUNTER
R/W
DOUT
ACK
PIN
XDEC
E2PROM
256 X 256
YDEC
8
CK DATA REGISTER DOUT
2783 ILL F01
©Xicor, 1995, 1996 Patents Pending
2783-3.5 5/13/96 T1/C0/D0 NS
Characteristics subject to change without notice
1




Xicor

X24645 Datasheet Preview

X24645 Datasheet

Advanced 2-Wire Serial E 2 PROM with Block Lock TM Protection

No Preview Available !

X24645
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 (S1, S2)
The device select inputs (S1, S2) are used to set the
first and second bits of the 8-bit slave address. This
allows up to four X24645 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
appropriate. 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 and the X24645 can be written
normally. When this input is held HIGH, and the WPEN
bit in the write protect register is set HIGH, write
protection is enabled, and nonvolatile writes are
disabled to the selected blocks as well as the write
protect register itself.
PIN NAMES
Symbol
S1, S2
SDA
SCL
WP
VSS
VCC
NC
Description
Device Select Inputs
Serial Data
Serial Clock
Write Protect
Ground
Supply Voltage
No Connect
2783 FRM T01.1
PIN CONFIGURATIONS
8-LEAD DIP & SOIC
NC
S1
S2
VSS
18
27
X24645
36
45
VCC
WP
SCL
SDA
NC
NC
NC
S1
S2
VSS
NC
14-LEAD SOIC
1 14
2 13
3 12
4 X24645 11
5 10
69
78
NC
NC
VCC
WP
SCL
SDA
NC
NC
NC
S1
NC
NC
NC
S2
VSS
NC
NC
20-LEAD TSSOP
1 20
2 19
3 18
4 17
5 X24645 16
6 15
7 14
8 13
9 12
10 11
NC
VCC
WP
NC
NC
NC
SCL
SDA
NC
NC
2783 ILL F02.4
2


Part Number X24645
Description Advanced 2-Wire Serial E 2 PROM with Block Lock TM Protection
Maker Xicor
Total Page 18 Pages
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