MAX691A Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Microprocessor Supervisory Circuits

19-0094; Rev 7a; 12/96
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/MAX800M’s 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
REGULATOR
+8V
0.1µF
1N4148
0.47F*
NO
CONNECTION
3
V_CC
1 _VBATT
5
BATT ON _{VOUT 2}
CE OUT ¹²
MAX691A
CMOS RAM
9
PFI
MAX693A
MAX800L
CE IN ¹³
ADDRESS
DECODE
MAX800M
4 _GND
11
WDI
7 _{OSC IN}
PFO ¹⁰
8 _{OSC SEL}
RESET ¹⁵
LOW LINE WDO
A0-A15
I/O
µP
NMI
RESET
6 14
AUDIBLE
ALARM
*MaxCap
SYSTEM STATUS INDICATORS
____________________________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 and Plastic
DIP Packages
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX691ACPE
0°C to +70°C
16 Plastic DIP
MAX691ACSE
0°C to +70°C
16 Narrow SO
MAX691ACWE
0°C to +70°C
16 Wide SO
MAX691AC/D
0°C to +70°C
Dice*
MAX691AEPE
-40°C to +85°C
16 Plastic DIP
MAX691AESE
-40°C to +85°C
16 Narrow SO
MAX691AEWE -40°C to +85°C
16 Wide SO
MAX691AEJE
-40°C to +85°C
16 CERDIP
MAX691AMJE -55°C to +125°C 16 CERDIP
Ordering Information continued on last page.
* Dice are specified at T_A = +25 °C, DC parameters only.
__________________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
SuperCap is a registered trademark of Baknor Industries. MaxCap is a registered trademark of The Carborundum Corp.
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