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ASM708RCUA

更新时间: 2024-11-26 22:50:15
品牌 Logo 应用领域
ALSC 电源电路电源管理电路光电二极管监控输入元件
页数 文件大小 规格书
16页 274K
描述
3/3.3/4.0 V uP Supervisor Circuits

ASM708RCUA 数据手册

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ASM706 P/ R/ S/ T/ J  
ASM708 R/ S/ T/ J  
October 2003  
rev 1.0  
3/3.3/4.0 V µP Supervisor Circuits  
Features  
General Description  
The ASM706P/R/S/T/J and ASM708R/S/T/J are cost effective  
CMOS supervisor circuits that monitor power-supply and  
battery voltage level, and µP/µC operation.  
Precision power supply minotor  
•2.63V threshold (ASM706P/R, ASM708R)  
•2.93V threshold (ASM706S, ASM708S)  
•3.08V threshold (ASM706T, ASM708T)  
•New 4.00V threshold (ASM706J , ASM708J)  
The family offers several functional options. Each device  
generates a reset signal during power-up, power-down and  
during brownout conditions. A reset is generated when the  
supply drops below 2.63V (ASM706P/R, ASM708R), 2.93V  
(ASM706S, ASM708S), 3.08V (ASM706T, ASM708T) or 4.00  
(ASM706J, ASM708J). In addition, the ASM706P/R/S/T/J  
feature a 1.6 second watchdog timer. The watchdog timer  
output will trigger a reset if connected to MR. Floating the WDI  
input pin disables the watchdog timer.  
Debounced manual reset input  
Auxiliary voltage monitor comparator  
•1.25V threshold  
•Battery monitor / auxiliary supply monitor  
Watchdog timer (ASM706P/R/S/T/J)  
•Watchdog can be disabled by floating WDI  
200ms reset time delay  
Three reset signal options  
•Active HIGH: ASM706P  
•Active LOW: ASM706R/S/T/J  
•Active HIGH and LOW outputs: ASM708R/S/T/J  
The ASM708R/S/T/J have both active-HIGH and active-LOW  
reset outputs but no watchdog function. The ASM706P has the  
same pin-out and functions as the ASM706R but has an active-  
HIGH reset output.  
DIP, SO and MicroSO packages  
Guaranteed RESET assertion to VCC = 1.1V  
Applications  
Computers and embedded controllers  
CTI applications  
Automotive systems  
Portable/Battery-operated systems  
Intelligent instruments  
Wireless communication systems  
PDAs and hand-held equipment  
Safety systems  
A versatile power-fail circuit, useful in checking battery levels  
and non-5V supplies, has a 1.25V threshold. All devices have a  
manual reset input. All devices are available in 8-pin DIP, SO  
and the compact MicroSO packages. The MicroSO package  
requires 50% less PC board area than the conventional SO  
package.  
Typical Operating Circuit  
Unregulated DC  
+3.3V Regulator  
µP  
VCC  
R1  
VCC  
RESET  
RESET  
(RESET)  
(RESET)  
PFI  
WDI  
I/O LINE  
ASM706 R/S/T  
ASM708 R/S/T  
(ASM706 P)  
NMI  
WDO  
PFO  
R2  
MR  
INTERRUPT  
Alliance Semiconductor  
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com  
Notice: The information in this document is subject to change without notice  

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