MAX691A/MAX693A/
MAX800L/MAX800M
Microprocessor Supervisory Circuits
General Description
Features
Applications
Ordering Information
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%.
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Computers
Controllers
Intelligent Instruments
Critical μP Power Monitoring
PINPACKAGE
MAX691ACUE
-0°C to +70°C 16 TSSOP
MAX691ACSE
-0°C to +70°C 16 Narrow SO
MAX691ACWE
-0°C to +70°C 16 Wide SO
MAX691ACPE
-0°C to +70°C 16 Plastic DIP
MAX691AC/D
-0°C to +70°C Dice*
MAX691AEUE
-0°C to +70°C 16 TSSOP
MAX691AESE
-40°C to +85°C 16 Narrow SO
MAX691AEWE
-40°C to +85°C 16 Wide SO
MAX691AEPE
-40°C to +85°C 16 Plastic DIP
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C, DC parameters only.
Devices in PDIP, SO, and TSSOP packages are available in
both leaded and lead-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering.
Lead free not available for CERDIP package.
PART
Typical Operating Circuit
+8V
5V
REGULATOR
0.1µF
3
VCC
1N4148
1
5
BATT ON
VOUT
VBATT
CE OUT
0.47F*
2
12
MAX691A
9
MAX693A CE IN 13
PFI
MAX800L
MAX800M
4
7
NO
CONNECTION
8
GND
WDI
OSC IN
PFO
OSC SEL
LOW LINE WDO
6
14
*MaxCap
RESET
CMOS RAM
ADDRESS
DECODE
TEMP RANGE
Pin Configuration
TOP VIEW
16 RESET
VOUT 2
15 RESET
NMI
11
VBATT 1
A0-A15
I/O
GND 4
µP
10
15
RESET
AUDIBLE
ALARM
SYSTEM STATUS INDICATORS
MaxCap is a registered trademark of Kanthal Globar, Inc.
19-0094; Rev 12; 9/14
●● 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 to VCC = +1V
●● Voltage Monitor for Power-Fail or Low-Battery
Warning
●● Power-Fail Accuracy Guaranteed to ±2%
(MAX800L/M)
●● Available in 16-Pin Narrow SO, Plastic DIP, and
TSSOP Packages
VCC 3
BATT ON 5
MAX691A
MAX693A
MAX800L
MAX800M
14 WDO
13 CE IN
12 CE OUT
LOW LINE 6
11 WDI
OSC IN 7
10 PFO
OSC SEL 8
9
DIP/SO/TSSOP
PFI
