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MAX690EPA+ 数据手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
分类:
电源监控芯片
封装:
DIP-8
描述:
MAXIM INTEGRATED PRODUCTS MAX690EPA+. 监控器电路, 低电平有效复位, 4.75V-5.5V输入, DIP-8
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MAX690EPA+数据手册
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General Description
The MAX690 family of supervisory circuits reduces the
complexity and number of components required for
power supply monitoring and battery control functions in
microprocessor systems. These include µP reset and
backup-battery switchover, watchdog timer, CMOS RAM
write protection, and power-failure warning. The MAX690
family significantly improves system reliability and accu-
racy compared to that obtainable with separate ICs or
discrete components.
The MAX690, MAX692, and MAX694 are supplied in
8-pin packages and provide four functions:
● A reset output during power-up, power-down, and
brownout conditions.
● Battery backup switching for CMOS RAM, CMOS
microprocessor or other low power logic.
● A Reset pulse if the optional watchdog timer has not
been toggled within a specified time.
● A 1.3V threshold detector for power fail warning, low
battery detection, or to monitor a power supply other
than +5V.
The MAX691, MAX693, and MAX695 are supplied in 16-pin
packages and perform all MAX690, MAX692, MAX694
functions, plus:
● Write protection of CMOS RAM or EEPROM.
● Adjustable reset and watchdog timeout periods.
● Separate outputs for indicating a watchdog timeout,
backup-battery switchover, and low V
CC
.
Benets and Features
● Supervisory Function Integration Saves Board Space
while Fully Protecting Microprocessor-Based Systems
• Precision Voltage Monitor
- 4.65V (MAX690, MAX691, MAX694, MAX695)
- 4.40V (MAX692, MAX693)
• Power OK/Reset Time Delay
- 50ms, 200ms, or Adjustable
• Watchdog Timer
- 100ms, 1.6s, or Adjustable
• Battery Backup Power Switching
• Voltage Monitor for Power Fail or Low Battery
Warning
• Minimum External Component Count
● Low Power Consumption in Battery Backup Mode
Extends Battery Life
• 1µA Standby Current
● Onboard Gating of Chip Enable Signals Protects
Against Erroneous Data Written to RAM During Low
V
CC
Events
Applications
● Computers
● Controllers
● Intelligent Instruments
● Automotive Systems
● Critical µP Power Monitoring
Ordering information appears at end of data sheet.
19-0218; Rev 5; 4/15
MAX690
MAX692
MAX694
81
72
63
5
V
BATT
RESET
WDI
PFO
4
V
OUT
TOP VIEW
V
CC
GND
PFI
MAX691
MAX693
MAX695
161
152
143
13
RESET
RESET
WDO
CE IN
4
V
BATT
V
OUT
V
CC
GND
125
116
10
CE OUT
WDI
PFO
7
BATT ON
LOW LINE
OSC IN
98 PFIOSC SEL
MAX690
V
CC
V
BATT
PFI
V
OUT
+5V
PFO
WDI
GND
MAX690 TYPICAL APPLICATION
RESET
POWER TO
CMOS RAM
µP
POWER
µP
SYSTEM
µP NMI
I/O
LINE
µP RESET
MAX690–MAX695 Microprocessor Supervisory Circuits
Pin Congurations
Typical Operating Circuit
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