Click here for production status of specific part numbers.
MAX691A/MAX693A/ MAX800L/MAX800M
Microprocessor Supervisory ...
Click here for production status of specific part numbers.
MAX691A/MAX693A/ MAX800L/MAX800M
Microprocessor Supervisory Circuits
General Description
The MAX691A/MAX693A/MAX800L/MAX800M microprocessor (μP) supervisory circuits are pin-compatible upgrades to the MAX691, MAX693, and MAX695. They improve performance with 30μA supply current, 200ms typ reset active delay on power-up, and 6ns chip-enable propagation delay. Features include write protection of CMOS RAM or EEPROM, separate watchdog outputs, backup-battery switchover, and a RESET output that is valid with VCC down to 1V. The MAX691A/ MAX800L have a 4.65V typical reset-threshold voltage, and the MAX693A/MAX800Ms’ reset threshold is 4.4V typical. The MAX800L/MAX800M guarantee power-fail accuracies to ±2%.
Applications
●● Computers ●● Controllers ●● Intelligent Instruments ●● Critical μP Power Monitoring
Typical Operating Circuit
5V +8V
REGULATOR
0.1µF
1N4148 0.47F*
35 VCC BATT ON VOUT 2 1 VBATT
CE OUT 12
NO CONNECTION
CMOS RAM
MAX691A
9
PFI
MAX693A MAX800L
CE
IN
13
4
MAX800M GND
11
WDI
7 OSC IN
PFO 10
8 OSC SEL
RESET 15 LOW LINE WDO
ADDRESS DECODE
A0-A15 I/O
µP
NMI
RESET
6 14
AUDIBLE ALARM
*MaxCap
SYSTEM STATUS INDICATORS
MaxCap is a registered trademark of Kanthal Globar, Inc.
Features
●● 200ms Power-OK/Reset Timeout Period
●● 1μA Standby Current, 30μA Operating Current
●● On-Board Gating of Chip-Enable Signals, 10ns max Delay
●● MaxCap® or SuperCap Compatible
●● Guaranteed RESET Assertion...