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CAT1021UE-42TE13 参数 Datasheet PDF下载

CAT1021UE-42TE13图片预览
型号: CAT1021UE-42TE13
PDF下载: 下载PDF文件 查看货源
内容描述: 监控电路,带有I2C串行2K位CMOS EEPROM ,手动复位及看门狗定时器 [Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer]
分类和应用: 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
文件页数/大小: 20 页 / 149 K
品牌: CATALYST [ CATALYST SEMICONDUCTOR ]
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CAT1021, CAT1022, CAT1023  
Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset  
and Watchdog Timer  
TM  
FEATURES  
Precision power supply voltage monitor  
— 5V, 3.3V and 3V systems  
— Five threshold voltage options  
Watchdog timer  
Built-in inadvertent write protection  
— WP pin (CAT1021)  
1,000,000 Program/Erase cycles  
Manual reset input  
Active high or low reset  
— Valid reset guaranteed at VCC = 1 V  
400kHz I2C bus  
100 year data retention  
8-pin DIP, SOIC, TSSOP, MSOP or TDFN  
(3 x 3 mm foot-print) packages  
— TDFN max height is 0.8mm  
3.0V to 5.5V operation  
Industrial and extended temperature ranges  
Low power CMOS technology  
16-Byte page write buffer  
DESCRIPTION  
The CAT1021, CAT1022 and CAT1023 are complete The power supply monitor and reset circuit protect memory  
memory and supervisory solutions for microcontroller- and system controllers during power up/down and against  
based systems. A 2k-bit serial EEPROM memory and a brownout conditions. Five reset threshold voltages support  
system power supervisor with brown-out protection are 5V, 3.3V and 3V systems. If power supply voltages are out  
integrated together in low power CMOS technology. of tolerance reset signals become active, preventing the  
Memory interface is via a 400kHz I2C bus.  
systemmicrocontroller, ASICorperipheralsfromoperating.  
Reset signals become inactive typically 200 ms after the  
supply voltage exceeds the reset threshold level. With both  
activehighandlowresetsignals,interfacetomicrocontrollers  
and other ICs is simple. In addition, the RESET pin or a  
separate input, MR, can be used as an input for push-button  
manual reset capability.  
The CAT1021 and CAT1023 provide a precision VCC  
sense circuit and two open drain outputs: one (RESET)  
drives high and the other (RESET) drives low whenever  
VCC fallsbelowtheresetthresholdvoltage.TheCAT1022  
has only a RESET output and does not have a Write  
Protect input. The CAT1021 also has a Write Protect  
input (WP). Write operations are disabled if WP is The on-chip, 2k-bit EEPROM memory features a 16-byte  
connected to a logic high.  
page. In addition, hardware data protection is provided by a  
VCC sense circuit that prevents writes to memory whenever  
VCC falls below the reset threshold or until VCC reaches the  
reset threshold during power up.  
Allsupervisorshavea1.6secondwatchdogtimercircuit  
that resets a system to a known state if software or a  
hardware glitch halts or “hangs” the system. For the  
CAT1021 and CAT1022, the watchdog timer monitors Available packages include an 8-pin DIP, 8-pin SOIC, 8-pin  
theSDAsignal.TheCAT1023hasaseparatewatchdog TSSOP, 8-pin TDFN and 8-pin MSOP. The TDFN package  
timer interrupt input pin, WDI.  
thickness is 0.8mm maximum. TDFN footprint options are  
3x3mm.  
© 2004 by Catalyst Semiconductor, Inc.  
Doc No. 3009, Rev. K  
Characteristics subject to change without notice