8K x 8 Bit
4K x 8 Bit
2K x 8 Bit
64K
32K
16K
X25643/45
X25323/25
X25163/65
Programmable Watchdog Timer & V
Supervisory Circuit w/Serial E2PROM
CC
FEATURES
DESCRIPTION
• Programmable Watchdog Timer
These devices combine three popular functions, Watch-
dog Timer, Supply Voltage Supervision, and Serial
E2PROM Memory in one package.This combination low-
ers system cost, reduces board space requirements, and
increases reliability.
• Low Vcc Detection and Reset Assertion
—Reset Signal Valid to Vcc=1V
• Save Critical Data With Block LockTM Protection
—Block LockTM Protect 0, 1/4, 1/2 or all of
Serial E2PROM Memory Array
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. During a system failure,
the device will respond with a RESET/RESET signal
after a selectable time-out interval. The user selects the
interval from three preset values. Once selected, the
interval does not change, even after cycling the power.
• In Circuit Programmable ROM Mode
• Long Battery Life With Low Power Consumption
—<50µA Max Standby Current, Watchdog On
—<1µA Max Standby Current, Watchdog Off
—<5mA Max Active Current during Write
—<400µA Max Active Current during Read
• 1.8V to 3.6V, 2.7V to 5.5V and 4.5V to 5.5V Power
Supply Operation
• 2MHz Clock Rate
• Minimize Programming Time
—32 Byte Page Write Mode
The user’s system is protected from low voltage condi-
tions by the device’s low Vcc detection circuitry. When
Vcc falls below the minimum Vcc trip point, the system is
reset. RESET/RESET is asserted until Vcc returns to
proper operating levels and stabilizes.
—Self-Timed Write Cycle
The memory portion of the device is a CMOS Serial
E2PROM array with Xicor’s Block LockTM Protection. The
array is internally organized as x 8.The device features a
Serial Peripheral Interface (SPI) and software protocol
allowing operation on a simple four-wire bus.
—5ms Write Cycle Time (Typical)
• SPI Modes (0,0 & 1,1)
• Built-in Inadvertent Write Protection
—Power-Up/Power-Down Protection Circuitry
—Write Enable Latch
—Write Protect Pin
• High Reliability
• Available Packages
—14-Lead SOIC (X2564x)
The device utilizes Xicor’s proprietary Direct WriteTM cell,
providing a minimum endurance of 100,000 cycles per
sector and a minimum data retention of 100 years.
—14-Lead TSSOP (X2532x, X2516x)
—8-Lead SOIC (X2532x, X2516x)
BLOCK DIAGRAM
SI
DATA
PAGE DECODE LOGIC
REGISTER
SO
32
8
COMMAND
DECODE &
CONTROL
LOGIC
X - DECODE
LOGIC
SCK
CS
SERIAL
E2PROM
ARRAY
STATUS
REGISTER
RESET
CONTROL
RESET/RESET
LOW
VOLTAGE
SENSE
WATCHDOG
TIMER
V
CC
HIGH
VOLTAGE
CONTROL
PROGRAMMING,
BLOCK LOCK &
ICP ROM CONTROL
WP
7036 FRM 01
Xicor, Inc. 1994, 1995, 1996 Patents Pending
7049 -1.0 6/20/97 T0/C0/D0 SH
Characteristics subject to change without notice
1
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