_______________General Description
The MAX691A/MAX693A/MAX800L/MAX800M micro-
processor (P) supervisory circuits are pin-compatible
upgrades to the MAX691, MAX693, and MAX695. They
improve performance with 30A 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 P Power Monitoring
____________________________Features
o
200ms Power-OK/Reset Timeout Period
o
1A Standby Current, 30A Operating Current
o
On-Board Gating of Chip-Enable Signals,
10ns Max Delay
o
MaxCap
TM
or SuperCap
TM
Compatible
o
Guaranteed
R
RE
ES
SE
ET
T
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
Ordering Information continued on last page.
* Dice are specified at T
A
= +25 C, DC parameters only.
MAX691A/MAX693A/MAX800L/MAX800M
Microprocessor Supervisory Circuits
________________________________________________________________
Maxim Integrated Products
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
RESET
RESET
WDO
CE IN
GND
V
CC
V
OUT
VBATT
TOP VIEW
MAX691A
MAX693A
MAX800L
MAX800M
CE OUT
WDI
PFO
PFI
OSC SEL
OSC IN
LOW LINE
BATT ON
DIP/SO
__________________Pin Configuration
MAX691A
MAX693A
MAX800L
MAX800M
V
OUT
V
CC
BATT ON
CE OUT
CE IN
WDI
PFO
RESET
VBATT
PFI
GND
OSC IN
OSC SEL
1
9
4
7
8
ADDRESS
DECODE
AUDIBLE
ALARM
5V
REGULATOR
+8V
0.1
F
CMOS RAM
2
12
11
10
15
13
5
3
A0-A15
I/O
NMI
RESET
P
LOW LINE WDO
SYSTEM STATUS INDICATORS
NO
CONNECTION
0.47F*
1N4148
*MaxCap
6
14
__________Typical Operating Circuit
19-0094; Rev 7a; 12/96
PART
MAX691A
CPE
MAX691ACSE
MAX691ACWE
0C to +70C
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 Wide SO
MAX691AC/D
MAX691AEJE
-40C to +85C
0C to +70C
Dice*
16 CERDIP
MAX691AEPE
MAX691AESE
-40C to +85C
-40C to +85C
16 Plastic DIP
16 Narrow SO
MAX691AEWE
-40C to +85C
16 Wide SO
MAX691AMJE
-55C to +125C
16 CERDIP
SuperCap is a registered trademark of Baknor Industries. MaxCap is a registered trademark of The Carborundum Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
T
A
= T
MIN
+ T
MIN
MAX691A/MAX693A/MAX800L/MAX800M
Microprocessor Supervisory Circuits
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(MAX691A, MAX800L: V
CC
= +4.75V to +5.5V, MAX693A, MAX800M: V
CC
= +4.5V to +5.5V, VBATT = 2.8V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND)
V
CC
.......................................................................-0.3V to +6V
VBATT...................................................................-0.3V to +6V
All Other Inputs .....................................-0.3V to (V
OUT
+ 0.3V)
Input Current
V
CC
Peak...........................................................................1.0A
V
CC
Continuous.............................................................250mA
VBATT Peak ..................................................................250mA
VBATT Continuous ..........................................................25mA
GND, BATT ON .............................................................100mA
All Other Outputs ............................................................25mA
Continuous Power Dissipation (T
A
= +70C)
Plastic DIP (derate 10.53mW/C above +70C) ..........842mW
Narrow SO (derate 8.70mW/C above +70C) ...........696mW
Wide SO (derate 9.52mW/C above +70C)...............762mW
CERDIP (derate 10.00mW/C above +70C) ..............800mW
Operating Temperature Ranges
MAX69_AC_ _/MAX800_C_ _ .............................0C to +70C
MAX69_AE_ _/MAX800_E_ _ ...........................-40C to +85C
MAX69_AMJE ................................................-55C to +125C
Storage Temperature Range .............................-65C to +160C
Lead Temperature (soldering, 10sec) .............................+300C
VBATT - 0.15
MAX69_AC, MAX800_C
0.8
1.2
VBATT = 4.5V, I
OUT
= 20mA
A
-1.0
0.02
VBATT + 0.2V
V
CC
VBATT Standby Current
(Note 3)
-0.1
0.02
A
5
V
CC
< VBATT - 1.2V
VBATT = 2.8V
Supply Current in
Battery-Backup Mode
(Excludes I
OUT
) (Note 2)
VBATT = 2.8V, I
OUT
= 10mA
V
0
5.5
CONDITIONS
Operating Voltage Range,
V
CC
, VBATT (Note 1)
VBATT = 4.5V
0.04
1
A
30
100
Supply Current in
Normal Operating Mode
(Excludes I
OUT
)
V
V
OUT
in Battery-Backup
Mode
VBATT - 0.25
VBATT = 2.8V
30
VBATT - 0.3
VBATT-to-V
OUT
On-Resistance
UNITS
MIN
TYP
MAX
PARAMETER
25
T
A
= +25C
V
CC
> VBATT - 1V
T
A
= T
MIN
+ T
MIN
VBATT = 2.0V, I
OUT
= 5mA
T
A
= +25C
T
A
= T
MIN
+ T
MIN
15
VBATT = 2.0V
V
CC
= 4.5V
I
OUT
= 250mA
V
CC
- 0.02
V
CC
- 0.05
I
OUT
= 25mA
MAX69_AC/AE,
MAX800_C/E
I
OUT
= 210mA
V
CC
- 0.2
V
CC
- 0.35
V
CC
- 0.2
V
CC
- 0.3
V
V
CC
- 0.40
V
CC
- 0.17
V
CC
- 0.3V
V
OUT
Output
MAX69_AE,
MAX800_C/E
MAX69_AC
MAX69_A/M
MAX69_AE, MAX800_E
0.8
1.4
MAX69_A/M
0.8
1.6
V
CC
= 4.5V
V
CC
-to-V
OUT
On-Resistance
V
VBATT - 0.3
Power-up
Battery Switchover
Threshold
VBATT + 0.3
Power-down
MAX691A/MAX693A/MAX800L/MAX800M
Microprocessor Supervisory Circuits
_______________________________________________________________________________________
3
MAX691A, MAX800L
mA
7
20
RESET Output Short-Circuit
Current
V
3.5
RESET Output Voltage
0.1
0.4
0.004
0.3
ns
100
Minimum Watchdog Input
Pulse Width
Clock
Cycles
1024
Watchdog Timeout Period,
External Clock (Note 4)
4096
ms
70
100
140
Watchdog Timeout Period,
Internal Oscillator
1.0
1.6
2.25
Clock
Cycles
2048
Reset Active Timeout Period,
External Clock (Note 4)
ms
140
200
280
Reset Active Timeout Period,
Internal Oscillator
ns
800
LOW LINE-to-RESET Delay
s
80
V
CC
to RESET Delay
MAX693A, MAX800M
CONDITIONS
mV
15
Reset Threshold Hysteresis
V
4.30
4.45
Reset Threshold Voltage
4.55
4.70
4.25
4.40
4.50
4.50
4.65
4.75
UNITS
MIN
TYP
MAX
PARAMETER
Output source current
I
SOURCE
= 1.6mA, V
CC
= 5V
I
SINK
= 3.2mA, V
CC
= 4.25V
I
SINK
= 50A, V
CC
= 1V, VBATT = 0V, V
CC
falling
V
IL
= 0.8V, V
IH
= 0.75 x V
CC
Short period
Long period
Short period
Long period
MAX800M, T
A
= +25C, V
CC
falling
Power-up
Power-up
MAX800L, T
A
= +25C, V
CC
falling
Power-down
ELECTRICAL CHARACTERISTICS (continued)
(MAX691A, MAX800L: V
CC
= +4.75V to +5.5V, MAX693A, MAX800M: V
CC
= +4.5V to +5.5V, VBATT = 2.8V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
RESET Output Voltage Low
(Note 5)
I
SINK
= 3.2mA
0.1
0.4
V
I
SINK
= 3.2mA, V
CC
= 4.25V
0.4
LOW LINE Output Voltage
I
SOURCE
= 1A, V
CC
= 5V
3.5
V
LOW LINE Output
Short-Circuit Current
Output source current
1
15
100
A
I
SINK
= 3.2mA
0.4
WDO Output Voltage
I
SOURCE
= 500A, V
CC
= 5V
3.5
V
WDO Output
Short-Circuit Current
Output source current
3
10
mA
V
IH
0.75 x V
CC
WDI Threshold Voltage
(Note 6)
V
IL
0.8
V
WDI = 0V
-50
-10
WDI Input Current
WDI = V
OUT
20
50
A
sec
mV
60
Battery Switchover
Hysteresis
I
SINK
= 25mA
V
0.7
1.5
BATT ON Output
Low Voltage
I
SINK
= 3.2mA
0.1
0.4
Source current
A
1
15
100
BATT ON Output
Short-Circuit Current
Sink current
mA
60
RESET AND WATCHDOG TIMER
MAX691A/MAX693A/MAX800L/MAX800M
Microprocessor Supervisory Circuits
4
_______________________________________________________________________________________
MAX69_AC/AE/AM, V
CC
= 5V
A
0.10
5
OSC IN Leakage Current
s
12
RESET-to-CE OUT Delay
2.7
CE OUT Output Voltage High
(Reset Active)
3.5
ns
6
10
CE IN-to-CE OUT Propagation
Delay (Note 8)
mA
0.1
0.75
2.0
CE OUT Short-Circuit Current
(Reset Active)
75
150
CE IN-to-CE OUT Resistance
(Note 7)
A
0.005
1
CE IN Leakage Current
60
PFI-to-PFO Delay
s
25
A
1
15
100
PFO Output Short-Circuit
Current
MAX800_C/E, V
CC
= 5V
CONDITIONS
3.5
PFO Output Voltage
V
0.4
nA
0.01
25
PFI Leakage Current
1.225
1.25
1.275
PFI Input Threshold
V
1.2
1.25
1.3
UNITS
MIN
TYP
MAX
PARAMETER
OSC SEL = 0V
Power-down
V
CC
= 0V, VBATT = 2.8V, I
OUT
= 1A
V
CC
= 5V, I
OUT
= -100A
50
source impedance driver, C
LOAD
= 50pF
Disable mode,
CE OUT = 0V
Enable mode
Disable mode
I
SOURCE
= 1A, V
CC
= 5V
I
SINK
= 3.2mA
V
IN
= 20mV, V
OD
= 15mV
V
IN
= -20mV, V
OD
= 15mV
Output source current
Note 1:
Either V
CC
or VBATT can go to 0V, if the other is greater than 2.0V.
Note 2:
The supply current drawn by the MAX691A/MAX800L/MAX800M from the battery excluding I
OUT
typically goes to 10A
when (VBATT - 1V) < V
CC
< VBATT. In most applications, this is a brief period as V
CC
falls through this region.
Note 3:
"+" = battery-discharging current, "--" = battery-charging current.
Note 4:
Although presented as typical values, the number of clock cycles for the reset and watchdog timeout periods are fixed and
do not vary with process or temperature.
Note 5:
RESET is an open-drain output and sinks current only.
Note 6:
WDI is internally connected to a voltage divider between V
OUT
and GND. If unconnected, WDI is driven to 1.6V (typ),
disabling the watchdog function.
Note 7:
The chip-enable resistance is tested with V
CC
= +4.75V for the MAX691A/MAX800L and V
CC
= +4.5V for the
MAX693A/MAX800M. CE IN = CE OUT = V
CC
/ 2.
Note 8:
The chip-enable propagation delay is measured from the 50% point at CE IN to the 50% point at CE OUT.
ELECTRICAL CHARACTERISTICS (continued)
(MAX691A, MAX800L: V
CC
= +4.75V to +5.5V, MAX693A, MAX800M: V
CC
= +4.5V to +5.5V, VBATT = 2.8V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
kHz
50
OSC IN Frequency Range
A
10
100
OSC SEL Input Pull-Up Current
A
10
100
OSC IN Input Pull-Up Current
OSC SEL = 0V
OSC SEL = 0V
OSC SEL = V
OUT
or floating, OSC IN = 0V
V
V
OUT
- 0.3
V
OUT
- 0.6
V
IH
3.65
2.00
OSC IN External Oscillator
Threshold Voltage
V
IL
kHz
100
OSC IN Frequency with
External Capacitor
OSC SEL = 0V, COSC = 47pF
V
POWER-FAIL COMPARATOR
CHIP-ENABLE GATING
INTERNAL OSCILLATOR
MAX691A/MAX693A/MAX800L/MAX800M
Microprocessor Supervisory Circuits
_______________________________________________________________________________________
5
36
26
-60
120
150
V
CC
SUPPLY CURRENT
vs. TEMPERATURE
(NORMAL OPERATING MODE)
34
MAX691A TOC-01
TEMPERATURE (C)
V
CC
SUPPLY CURRENT (
A)
30
30
28
-30
0
90
32
60
V
CC
= 5V
VBATT = 2.8V
PFI, CE IN = 0V
0
-60
120
150
BATTERY SUPPLY CURRENT
vs. TEMPERATURE
(BATTERY-BACKUP MODE)
2
MAX691A TOC-02
TEMPERATURE (C)
BATTERY SUPPLY CURRENT (
A)
30
1
0.5
-30
0
90
1.5
60
V
CC
= 5V
VBATT = 2.8V
NO LOAD
120
-60
120 150 180
CHIP-ENABLE ON-RESISTANCE
vs. TEMPERATURE
100
MAX691A TOC-03
TEMPERATURE (C)
CE ON-RESISTANCE (
)
30
60
40
-30
0
90
80
60
V
CC
= 4.75V
VBATT = 2.8V
V
CE IN
= V
CC
/2
20
5
-60
120
150
VBATT to V
OUT
ON-RESISTANCE
vs. TEMPERATURE
MAX691A TOC-04
TEMPERATURE (C)
VBATT-to-V
OUT
ON-RESISTANCE (
)
30
10
-30
0
90
15
60
V
CC
= 0V
VBATT = 2.8V
VBATT = 2.0V
VBATT = 4.5V
4.75
4.30
-60
120
150
RESET THRESHOLD
vs. TEMPERATURE
MAX691A TOC-07
TEMPERATURE (C)
RESET THRESHOLD (V)
30
4.45
-30
0
90
4.65
4.40
4.35
4.50
4.70
4.55
4.60
60
VBATT = 2.8V
MAX691A
MAX800L
MAX693A
MAX800M
1.2
0.6
-60
120
150
V
CC
to V
OUT
ON-RESISTANCE
vs. TEMPERATURE
MAX691A TOC-05
TEMPERATURE (C)
V
CC
-to-V
OUT
ON-RESISTANCE (
)
30
0.8
-30
0
90
1.0
0.7
0.9
1.1
60
V
CC
= 5V,
VBATT = 0V
1.50
0
-60
120
150
PFI THRESHOLD
vs. TEMPERATURE
MAX691A TOC-06
TEMPERATURE (C)
PFI THRESHOLD (V)
30
0.50
-30
0
90
1.00
0.25
0.75
1.25
60
V
CC
= +5V,
VBATT = 0V
NO LOAD ON PFO
600
0
-60
120
150
RESET OUTPUT RESISTANCE
vs. TEMPERATURE
MAX691A TOC-08
TEMPERATURE (C)
RESET OUTPUT RESISTANCE (
)
30
200
-30
0
90
100
500
300
400
60
V
CC
= 5V, VBATT = 2.8V
SOURCING CURRENT
V
CC
= 0V, VBATT = 2.8V
SINKING CURRENT
-60
120
150
RESET DELAY
vs. TEMPERATURE
230
MAX691A TOC-09
TEMPERATURE (C)
RESET DELAY (ms)
30
190
170
-30
0
90
210
220
180
200
60
V
CC
= 0V TO 5V STEP
VBATT = 2.8V
__________________________________________Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
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