X40626 Datasheet: 8K x 8 Bit Dual Voltage CPU Supervisor





X40626 8K x 8 Bit Dual Voltage CPU Supervisor Datasheet

Part Number X40626
Description 8K x 8 Bit Dual Voltage CPU Supervisor
Manufacture Renesas
Total Page 22 Pages
PDF Download Download X40626 Datasheet PDF

Features: DATASHEET X40626 64K, 8K x 8 Bit Dual V oltage CPU Supervisor with 64K Serial E EPROM FN8119 Rev 0.00 March 28, 2005 FEATURES • Dual voltage monitoring V2Mon operates independent of VCC • Watchdog timer with selectable timeout intervals • Low VCC detection and res et assertion —Four standard reset thr eshold voltages —User programmable VT RIP threshold —Reset signal valid to VCC=1V • Low power CMOS —20µA max standby current, watchdog on —1µA st andby current, watchdog OFF • 64Kbits of EEPROM —64 byte page size • Bui lt-in inadvertent write protection —P ower-up/power-down protection circuitry —Protect 0, 1/4, 1/2, all or 64, 128 , 256 or 512 bytes of EEPROM array with programmable Block Lock™ protection • 400kHz 2-wire interface —Slave ad dressing supports up to 4 devices on th e same bus • 2.7V to 5.5V power supp ly operation • Available Packages — 14-lead SOIC —14-lead TSSOP DESCRIPTI ON The X40626 combines four popular functions, Power-on Reset C.

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DATASHEET
X40626
64K, 8K x 8 Bit Dual Voltage CPU Supervisor with 64K Serial EEPROM
FN8119
Rev 0.00
March 28, 2005
FEATURES
• Dual voltage monitoring
—V2Mon operates independent of VCC
• Watchdog timer with selectable timeout intervals
• Low VCC detection and reset assertion
—Four standard reset threshold voltages
—User programmable VTRIP threshold
—Reset signal valid to VCC=1V
• Low power CMOS
—20µA max standby current, watchdog on
—1µA standby current, watchdog OFF
• 64Kbits of EEPROM
—64 byte page size
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2, all or 64, 128, 256 or 512
bytes of EEPROM array with programmable
Block Lockprotection
• 400kHz 2-wire interface
—Slave addressing supports up to 4 devices on
the same bus
• 2.7V to 5.5V power supply operation
• Available Packages
—14-lead SOIC
—14-lead TSSOP
DESCRIPTION
The X40626 combines four popular functions, Power-on
Reset Control, Watchdog Timer, Dual Supply Voltage
Supervision, and Serial EEPROM Memory in one pack-
age. This combination lowers system cost, reduces
board space requirements, and increases reliability.
Applying power to the device activates the power-on
reset circuit which holds RESET active for a period of
time. This allows the power supply and oscillator to stabi-
lize before the processor can execute code.
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable time-
out interval, the device activates the RESET signal. The
user selects the interval from three preset values. Once
selected, the interval does not change, even after cycling
the power.
BLOCK DIAGRAM
V2MON
WP
SDA
SCL
S0
S1
VCC
V2 Monitor
Logic
+
VTRIP2
-
Watchdog Transition
Detector
Data
Register
Command
Decode &
Control
Logic
VCC Threshold
Reset logic
Protect Logic
Status
Register
64KB
EEPROM
Array
Watchdog
Timer Reset
Reset &
Watchdog
Timebase
VTRIP
+
-
Power-on and
Low Voltage
Reset
Generation
V2FAIL
RESET
FN8119 Rev 0.00
March 28, 2005
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