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X4325S8I-2.7 PDF预览

X4325S8I-2.7

更新时间: 2024-10-31 22:12:43
品牌 Logo 应用领域
英特矽尔 - INTERSIL 光电二极管监控可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数 文件大小 规格书
21页 331K
描述
CPU Supervisor with 32K EEPROM

X4325S8I-2.7 数据手册

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X4323, X4325  
®
32K, 4K x 8 Bit  
Data Sheet  
March 29, 2005  
FN8122.0  
DESCRIPTION  
CPU Supervisor with 32K EEPROM  
The X4323/5 combines four popular functions, Power-  
on Reset Control, Watchdog Timer, Supply Voltage  
Supervision, and Serial EEPROM Memory in one pack-  
age. This combination lowers system cost, reduces  
board space requirements, and increases reliability.  
FEATURES  
• Selectable watchdog timer  
• Low V detection and reset assertion  
CC  
—Four standard reset threshold voltages  
—Adjust low V reset threshold voltage using  
CC  
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.  
special programming sequence  
—Reset signal valid to V = 1V  
CC  
• Low power CMOS  
—<20µA max standby current, watchdog on  
—<1µA standby current, watchdog off  
—3mA active current  
• 32Kbits of EEPROM  
—64-byte page write mode  
—Self-timed write cycle  
—5ms write cycle time (typical)  
• Built-in inadvertent write protection  
—Power-up/power-down protection circuitry  
—Block Lock (1, 2, 4, 8 pages, all, none)  
• 400kHz 2-wire interface  
• 2.7V to 5.5V power supply operation  
• Available packages  
—8-lead SOIC  
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/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  
detection circuitry protects the  
CC  
user’s system from low voltage conditions, resetting the  
system when V falls below the set minimum V trip  
CC  
CC  
point. RESET/RESET is asserted until V  
returns to  
CC  
proper operating level and stabilizes. Four industry  
standard V thresholds are available, however, Inter-  
TRIP  
—8-lead TSSOP  
sil’s unique circuits allow the threshold to be repro-  
grammed to meet custom requirements or to fine-tune  
the threshold for applications requiring higher precision.  
BLOCK DIAGRAM  
Watchdog Transition  
Detector  
Watchdog  
Timer Reset  
WP  
Protect Logic  
RESET (X4323)  
RESET (X4325)  
Data  
Register  
SDA  
Status  
Register  
EEPROM Array  
Command  
Reset &  
Watchdog  
Timebase  
SCL  
Decode &  
Control  
Logic  
S0  
S1  
VCC Threshold  
Reset logic  
Power-on and  
+
-
Low Voltage  
VCC  
Reset  
Generation  
VTRIP  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.  
Copyright Intersil Americas Inc. 2005. All Rights Reserved  
1
All other trademarks mentioned are the property of their respective owners.  

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