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CAT1026LI-28-GT2

更新时间： 2024-11-15 05:08:23
品牌 Logo 应用领域
CATALYST 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
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20页 314K
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Dual Voltage Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM

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CAT1026LI-28-GT2 数据手册

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CAT1026, CAT1027  
Dual Voltage Supervisory Circuits with  
I2C Serial 2k-bit CMOS EEPROM  
supply monitor and reset circuit protects memory and  
FEATURES  
systems controllers during power up/down and  
against brownout conditions. If power supply voltages  
are out of tolerance reset signals become active  
preventing the system microcontroller, ASIC, or  
peripherals from operating.  
ꢀ Precision VCC Power Supply Voltage Monitor  
— 5V, 3.3V and 3V systems  
— Five threshold voltage options  
ꢀ Additional voltage monitoring  
— Externally adjustable down to 1.25V  
ꢀ Watchdog timer (CAT1027 only)  
ꢀ Active High or Low Reset  
The CAT1026 features two open drain reset outputs:  
¯¯¯¯¯¯  
one (RESET) drives high and the other (RESET)  
drives low whenever VCC falls below the threshold.  
Reset outputs become inactive typically 200 ms after  
the supply voltage exceeds the reset threshold value.  
With both active high and low reset signals, interface  
to microcontrollers and other ICs is simple. CAT1027  
— Valid reset guaranteed at VCC = 1V  
ꢀ 400kHz I2C Bus  
ꢀ 2.7V to 5.5V Operation  
¯¯¯¯¯¯  
¯¯¯¯¯¯  
has only a RESET output. In addition, the RESET pin  
can be used as an input for push-button manual reset  
capability.  
ꢀ Low power CMOS technology  
ꢀ 16-Byte Page Write Buffer  
ꢀ Built-in inadvertent write protection  
ꢀ 1,000,000 Program/Erase cycles  
ꢀ Manual Reset capability  
The CAT1026 and CAT1027 provide an auxiliary  
voltage sensor input, VSENSE, which is used to monitor  
a second system supply. The auxiliary high impe-  
dance comparator drives the open drain output, VLOW  
,
ꢀ 100 year data retention  
whenever the sense voltage is below 1.25V threshold.  
ꢀ Industrial and extended temperature ranges  
The CAT1027 is designed with a 1.6 second  
watchdog timer circuit that resets a system to a known  
state if software or a hardware glitch halts or “hangs”  
the system. The CAT1027 features a watchdog timer  
interrupt input, WDI.  
ꢀ 8-pin DIP, SOIC, TSSOP, MSOP or TDFN  
(3 x 3mm foot-print) packages  
— TDFN max height is 0.8mm  
For Ordering Information details, see page 19.  
The on-chip 2k-bit EEPROM memory features a 16-byte  
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.  
DESCRIPTION  
The CAT1026 and CAT1027 are complete memory  
and supervisory solutions for microcontroller-based  
systems. A 2k-bit serial EEPROM memory and a  
system power supervisor with brown-out protection  
are integrated together in low power CMOS techno–  
logy. Memory interface is via a 400kHz I2C bus.  
Available packages include 8-pin DIP and surface  
mount, 8-pin SO, 8-pin TSSOP, 8-pin TDFN and 8-pin  
MSOP packages. The TDFN package thickness is  
0.8mm maximum. TDFN footprint is 3 x 3mm.  
The CAT1026 and CAT1027 provide a precision VCC  
sense circuit with five reset threshold voltage options  
that support 5V, 3.3V and 3V systems. The power  
© 2007 Catalyst Semiconductor, Inc.  
Characteristics subject to change without notice  
1
Doc. No. 3010 Rev. L  
1234567...20

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