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X4283S8-2.7

更新时间: 2024-11-18 22:12:43
品牌 Logo 应用领域
英特矽尔 - INTERSIL 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 320K
描述
CPU Supervisor with 128K EEPROM

X4283S8-2.7 数据手册

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X4283, X4285  
®
128K, 16K x 8 Bit  
Data Sheet  
March 29, 2005  
FN8121.0  
DESCRIPTION  
CPU Supervisor with 128K EEPROM  
The X4283/85 combines 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 require-  
ments, 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  
special programming sequence  
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.  
—Reset signal valid to V = 1V  
CC  
• Low power CMOS  
—<20µA max standby current, watchdog on  
—<1µA standby current, watchdog OFF  
—3mA active current  
• 128Kbits of EEPROM  
—64 byte page write mode  
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.  
—Self-timed write cycle  
—5ms write cycle time (typical)  
• 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  
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  
Block Lock protection  
CC  
CC  
• 400kHz 2-wire interface  
• 2.7V to 5.5V power supply operation  
• Available packages  
—8-lead SOIC  
trip point. RESET/RESET is asserted until V returns  
CC  
to proper operating level and stabilizes. Four industry  
standard Vtrip thresholds are available, however, Inter-  
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.  
—8-lead TSSOP  
BLOCK DIAGRAM  
Watchdog Transition  
Detector  
Watchdog  
Timer Reset  
WP  
Protect Logic  
RESET (X4283)  
RESET (X4285)  
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  
Kb=Kilobyte  
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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