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參數(shù)資料
| 型號： | X51638V14-2.7A |
| 元件分類： | EEPROM |
| 英文描述： | SPI Serial EEPROM with Supervisory Features |
| 中文描述： | SPI串行EEPROM，帶有監(jiān)控功能 |
| 文件頁數(shù)： | 1/21頁 |
| 文件大?。?/td> | 117K |
| 代理商： | X51638V14-2.7A |
REV 1.1 3/5/01
Characteristics subject to change without notice.
1 of 21
www.xicor.com
Preliminary Information
Replaces X25163/X25165
X5163/X5165
CPU Supervisor with 16Kbit SPI EEPROM
FEATURES
Selectable watchdog timer
Low V
CC
detection and reset assertion
—Five standard reset threshold voltages
—Re-program low V
using special programming sequence
—Reset signal valid to V
Determine watchdog or low voltage reset with a
volatile flag bit
Long battery life with low power consumption
—<50μA max standby current, watchdog on
—<1μA max standby current, watchdog off
—<400μA max active current during read
16Kbits of EEPROM
Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2 or all of EEPROM array with
Block Lock
protection
—In circuit programmable ROM mode
2MHz SPI interface modes (0,0 & 1,1)
Minimize EEPROM programming time
—32-byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
2.7V to 5.5V and 4.5V to 5.5V power supply
operation
Available packages
—14-lead TSSOP, 8-lead SOIC
CC
reset threshold voltage
CC
= 1V
DESCRIPTION
These devices combine four popular functions, Power-
on Reset Control, Watchdog Timer, Supply Voltage
Supervision, and Block Lock Protect Serial EEPROM
Memory in one package. 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/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcon-
troller fails to restart a timer within a selectable time out
interval, the device activates the RESET/RESET signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even
after cycling the power.
The device’s low V
user’s system from low voltage conditions, resetting the
system when V
CC
falls below the minimum V
RESET/RESET is asserted until V
operating level and stabilizes. Five industry standard
V
TRIP
thresholds are available, however, Xicor’s unique
circuits allow the threshold to be reprogrammed to meet
custom requirements or to fine-tune the threshold for
applications requiring higher precision.
CC
detection circuitry protects the
CC
trip point.
CC
returns to proper
BLOCK DIAGRAM
Watchdog
Timer Reset
Data
Register
Command
Decode &
Control
Logic
SI
SO
SCK
CS/WDI
V
CC
Reset &
Watchdog
Timebase
Power on and
Low Voltage
Generation
V
TRIP
+
-
RESET/RESET
Reset
Status
Register
Protect Logic
4K Bits
4K Bits
8K Bits
E
Watchdog Transition
Detector
WP
X5163 = RESET
X5165 = RESET
V
CC
Threshold
Reset Logic
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