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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX696 Datasheet

Microprocessor Supervisory Circuits

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MAX696/MAX697
Microprocessor Supervisory Circuits
General Description
The MAX696/MAX697 supervisory circuits reduce the
complexity and number of components required for
power-supply monitoring and battery-control functions
in microprocessor (μP) systems. These include μP reset
and backup-battery switchover, watchdog timer, CMOS
RAM write protection, and power-failure warning. The
MAX696/MAX697 significantly improve system reliability
and accuracy compared to that obtained with separate
ICs or discrete components.
The MAX696 and MAX697 are supplied in 16-pin pack-
ages and perform six functions:
1) A reset output during power-up, power-down, and
brownout conditions. The threshold for this “lowline”
reset is adjustable by an external voltagedivider.
2) A reset pulse if the optional watchdog timer has not
been toggled within a specified time.
3) Individual outputs for low-line and watchdog fault con-
ditions.
4) The reset time may be left at its default value of 50ms,
or may be varied with an external capacitor or clock
pulses.
5) A separate 1.3V threshold detector for power-fail warn-
ing, low-battery detection, or to monitor a power supply
other than VCC.
The MAX696 also has battery-backup switching for CMOS
RAM, CMOS microprocessor, or other lowpower logic.
The MAX697 lacks battery-backup switching, but has
write-protection pins (CE IN and CE OUT) for CMOS
RAM or EPROM. In addition, it consumes less than 250
microamperes.
Applications
● Computers
● Controllers
● Intelligent Instruments
Critical μP Power Monitoring
Typical Operating Circuit appears at end of data sheet.
Pin Configurations continued at end of data sheet.
Features
Adjustable Low-Line Monitor and Power-Down Reset
Power-OK/Reset Time Delay
Watchdog Timer—100ms, 1.6s, or Adjustable
● Minimum Component Count
1μA Standby Current
Battery-Backup Power Switching (MAX696)
On-Board Gating of Chip-Enable Signals (MAX697)
Separate Monitor for Power-Fail or Low-Battery
Warning
Ordering Information
PART
MAX696C/D
MAX696CPE
MAX696CWE
MAX696EPE
MAX696EJE
MAX696EWE
MAX696MJE
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
Dice
16 PDIP
16 Wide SO
16 PDIP
16 CERDIP
16 Wide SO
16 CERDIP
Ordering Information continued at end of data sheet.
Devices in PDIP and SO packages are available in both leaded
and lead(Pb)-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 Configurations
TOP VIEW
VBATT 1
VOUT 2
16 RESET
15 RESET
VCC 3
GND 4
MAX696
14 WDO
13 LLIN
BATT ON 5
12 N.C.
LOW LINE 6
11 WDI
OSC IN 7
10 PFO
OSC SEL 8
9 PFI
19-0829; Rev 5; 7/14


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX696 Datasheet

Microprocessor Supervisory Circuits

No Preview Available !

MAX696/MAX697
Microprocessor Supervisory Circuits
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
VCC.......................................................................-0.3V to +6V
VBATT...................................................................-0.3V to +6V
All Other Inputs (Note 1).....................-0.3V to (VOUT + 0.5V)
Input Current
VCC................................................................................200mA
VBATT..............................................................................50mA
GND.................................................................................20mA
Output Current
VOUT....................................................Short-Circuit Protected
All Other Outputs.............................................................20mA
Rate-of-Rise, VBATT, VCC...............................................100V/μs
Operating Temperature Range
C Suffix................................................................0°C to +70°C
E Suffix.............................................................-40°C to +85°C
M Suffix..........................................................-55°C to +125°C
Power Dissipation (TA = +70°C)
16-Pin PDIP (derated 7mW/°C above +70°C)..............600mW
16-Pin SO (derated 7mW/°C above +70°C).................600mW
16-Pin CERDIP (derated 10mW/°C above +85°C)......600mW
Storage Temperature Range..............................-65°C to +160°C
Lead Temperature (soldering, 10s)..................................+300°C
Note 1: The input voltage limits on PFI and WDI may be exceeded providing the input current is limited to less than 10mA.
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.
Electrical Characteristics
(VCC = full operating range, VBATT = 2.8V, TA = +25°C, unless otherwise noted.)
PARAMETER
Operating Voltage Range
TA = full
Supply Current (MAX697)
TA = full
BATTERY-BACKUP SWITCHING (MAX696)
CONDITIONS
MAX696 VCC
MAX696 VBATT
MAX697 VCC
VOUT Output Voltage
IOUT = 1mA, TA = full
IOUT = 50mA, TA = full
VOUT in Battery-Backup Mode
IOUT = 250µA, VCC < (VBATT - 0.2V), TA = full
Supply Current (Excludes IOUT)
IOUT = 1mA
IOUT = 50mA
Supply Current in Battery-Backup VCC = 0V, VBATT = 2.8V, TA = +25°C
Mode
VCC = 0V, VBATT = 2.8V, TA = full
Battery Standby Leakage Current
5.5V > VCC > (VBATT +
0.3V)
TA = +25°C
TA = full
Battery Switchover Threshold VCC Power-up
- VBATT
Power-down
Battery Switchover Hysteresis
BATT ON Output Voltage
ISINK - 1.6mA
BATT ON Output Short-Circuit
BATT ON = VOUT = 2.4V sink current
Current
BATT ON = VOUT, VCC = 0V
RESET AND WATCHDOG TIMER
Low-Line Voltage Threshold (LLIN) VCC = +5V, +3V; TA = full
Reset Timeout Delay
Figure 6, OSC SEL HIGH, VCC = 5V
Watchdog Timeout Period,
Internal Oscillator
Long period, VCC = 5V
Short period, VCC = 5V
MIN TYP MAX UNITS
3.0 5.5
2.0 VCC - 0.3V V
3.0 5.5
160 300
µA
VCC -
0.3
VCC -
0.5
VBATT -
0.1
VCC -
0.1
VCC -
0.25
VBATT
- 0.02
1.5
2.5
0.6
-100
-1.00
70
50
20
7
0.5 2.5
4
7
1
10
+20
+0.02
0.4
25.0
V
V
mA
µA
nA
µA
mV
mV
V
mA
µA
1.25
35
1.00
70
1.30
50
1.6
100
1.35
70
2.25
140
V
ms
s
ms
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX696
Description Microprocessor Supervisory Circuits
Maker Maxim
Total Page 16 Pages
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