MAX691A_08 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – Microprocessor Supervisory Circuits

19-0094; Rev 11; 8/08
Microprocessor Supervisory Circuits
General Description
The MAX691A/MAX693A/MAX800L/MAX800M micro-
processor (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 pro-
tection of CMOS RAM or EEPROM, separate watchdog
outputs, backup-battery switchover, and a RESET out-
put that is valid with V_CC 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
Automotive Systems
Critical µP Power Monitoring
Typical Operating Circuit
5V
+8V ^REGULATOR
0.1μF
1N4148
0.47F*
NO
CONNECTION
3
5
V_CC BATT ON _{VOUT 2}
1
VBATT
CE OUT ¹²
MAX691A
9 _PFI
MAX693A
MAX800L
CE IN ¹³
4 _GND ^MAX800M
11
WDI
7 _{OSC IN}
PFO ¹⁰
8 _{OSC SEL}
RESET ¹⁵
LOW LINE WDO
CMOS RAM
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
o 200ms Power-OK/Reset Timeout Period
o 1µA Standby Current, 30µA Operating Current
o On-Board Gating of Chip-Enable Signals,
10ns max Delay
o MaxCap^® or SuperCap Compatible
o Guaranteed RESET Assertion to V_CC = +1V
o Voltage Monitor for Power-Fail or Low-Battery
Warning
o Power-Fail Accuracy Guaranteed to ±2%
(MAX800L/M)
o Available in 16-Pin Narrow SO, Plastic
DIP, and TSSOP Packages
Ordering Information
PART
TEMP RANGE
PIN -
PACKAGE
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 on last page.
*Dice are specified at T_A = +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.
Pin Configuration
TOP VIEW
VBATT ₁
V_OUT 2
V_{CC 3}
GND ₄
BATT ON 5
LOW LINE 6
OSC IN ₇
OSC SEL ₈
MAX691A
MAX693A
MAX800L
MAX800M
16 ^RESET
15 ^RESET
14 ^WDO
13 CE IN
12 CE OUT
11 WDI
10 PFO
9 PFI
DIP/SO/TSSOP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.