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ADM695ARZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
Microprocessor
Supervisory Circuits
ADM690–ADM695
FEATURES
Superior Upgrade for MAX690–MAX695
Specified Over Temperature
Low Power Consumption (5 mW)
Precision Voltage Monitor
Reset Assertion Down to 1 V V
CC
Low Switch On-Resistance 1.5 V Normal,
20 V in Backup
High Current Drive (100 mA)
Watchdog Timer—100 ms, 1.6 s, or Adjustable
600 nA Standby Current
Automatic Battery Backup Power Switching
Extremely Fast Gating of Chip Enable Signals (5 ns)
Voltage Monitor for Power Fail
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
GENERAL DESCRIPTION
The ADM690–ADM695 family of supervisory circuits offers
complete single chip solutions for power supply monitoring and
battery control functions in microprocessor systems. These
functions include µP reset, backup battery switchover, watchdog
timer, CMOS RAM write protection, and power failure warn-
ing. The complete family provides a variety of configurations to
satisfy most microprocessor system requirements.
The ADM690, ADM692 and ADM694 are available in 8-pin
DIP packages and provide:
1. Power-on reset output during power-up, power-down and
brownout conditions. The
RESET output remains opera-
tional with V
CC
as low as 1 V.
2. Battery backup switching for CMOS RAM, CMOS
microprocessor or other low power logic.
3. A reset pulse if the optional watchdog timer has not been
toggled within a specified time.
4. A 1.3 V threshold detector for power fail warning, low battery
detection, or to monitor a power supply other than +5 V.
The ADM691, ADM693 and ADM695 are available in 16-pin
DIP and small outline packages and provide three additional
functions.
1. Write protection of CMOS RAM or EEPROM.
2. Adjustable reset and watchdog timeout periods.
3. Separate watchdog timeout, backup battery switchover, and
low V
CC
status outputs.
The ADM690–ADM695 family is fabricated using an advanced
epitaxial CMOS process combining low power consumption
(5 mW), extremely fast Chip Enable gating (5 ns) and high reli-
ability.
RESET assertion is guaranteed with V
CC
as low as 1 V.
In addition, the power switching circuitry is designed for mini-
mal voltage drop thereby permitting increased output current
drive of up to 100 mA without the need for an external pass
transistor.
FUNCTIONAL BLOCK DIAGRAMS
4.65V
1
WATCHDOG
TRANSITION DETECTOR
1.3V
ADM691
ADM693
ADM695
V
OUT
V
BATT
V
CC
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
1
VOLTAGE DETECTOR = 4.65V (ADM691, ADM695)
4.40V (ADM693)
POWER FAIL
OUTPUT (PFO)
RESET
WATCHDOG
TIMER
RESET &
WATCHDOG
TIMEBASE
RESET
GENERATOR
BATT ON
OSC IN
OSC SEL
WATCHDOG
OUTPUT (WDO)
RESET
LOW LINE
CE
OUT
CE
IN
4.65V
1
RESET
GENERATOR
2
WATCHDOG
TRANSITION DETECTOR
(1.6s)
1.3V
ADM690
ADM692
ADM694
V
OUT
V
BATT
V
CC
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
1
VOLTAGE DETECTOR = 4.65V (ADM690, ADM694)
4.40V (ADM692)
2
RESET PULSE WIDTH = 50ms (ADM690, ADM692)
200ms (ADM694)
POWER FAIL
OUTPUT (PFO)
RESET
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
ADM690–ADM695–SPECIFICATIONS
Parameter Min Typ Max Units Test Conditions/Comments
BATTERY BACKUP SWITCHING
V
CC
Operating Voltage Range
ADM690, ADM691, ADM694, ADM695 4.75 5.5 V
ADM692, ADM693 4.5 5.5 V
V
BATT
Operating Voltage Range
ADM690, ADM691, ADM694, ADM695 2.0 4.25 V
ADM692, ADM693 2.0 4.0 V
V
OUT
Output Voltage V
CC
– 0.05 V
CC
– 0.025 V I
OUT
= 1 mA
V
CC
– 0.5 V
CC
– 0.25 V I
OUT
≤ 100 mA
V
OUT
in Battery Backup Mode V
BATT
– 0.05 V
BATT
– 0.02 V I
OUT
= 250 µA, V
CC
< V
BATT
– 0.2 V
Supply Current (Excludes I
OUT
) 1 1.95 mA I
OUT
= 100 mA
Supply Current in Battery Backup Mode 0.6 1 µAV
CC
= 0 V, V
BATT
= 2.8 V
Battery Standby Current 5.5 V > V
CC
> V
BATT
+ 0.2 V
(+ = Discharge, – = Charge) –0.1 +0.02 µAT
A
= +25°C
–1.0 +0.02 µA
Battery Switchover Threshold 70 mV Power Up
V
CC
– V
BATT
50 mV Power Down
Battery Switchover Hysteresis 20 mV
BATT ON Output Voltage 0.3 V I
SINK
= 3.2 mA
BATT ON Output Short Circuit Current 35 mA BATT ON = V
OUT
= 4.5 V Sink Current
0.5 1 25 µA BATT ON = 0 V Source Current
RESET AND WATCHDOG TIMER
Reset Voltage Threshold
ADM690, ADM691, ADM694, ADM695 4.5 4.65 4.73 V
ADM692, ADM693 4.25 4.4 4.48 V
Reset Threshold Hysteresis 40 mV
Reset Timeout Delay
ADM690, ADM691, ADM692, ADM693 35 50 70 ms OSC SEL = HIGH, V
CC
= 5 V, T
A
= +25°C
ADM694, ADM695 140 200 280 ms OSC SEL = HIGH, V
CC
= 5 V, T
A
= +25°C
Watchdog Timeout Period, Internal Oscillator 1.0 1.6 2.25 s Long Period, V
CC
= 5 V, T
A
= +25°C
70 100 140 ms Short Period, V
CC
= 5 V, T
A
= +25°C
Watchdog Timeout Period, External Clock 3840 4097 Cycles Long Period
768 1025 Cycles Short Period
Minimum WDI Input Pulse Width 50 ns V
IL
= 0.4, V
IH
= 3.5 V
RESET Output Voltage @ V
CC
= +1 V 4 200 mV I
SINK
= 10 µA, V
CC
= 1 V
RESET, LOW LINE Output Voltage 0.4 V I
SINK
= 1.6 mA, V
CC
= 4.25 V
3.5 V I
SOURCE
= 1 µA, V
CC
= 5 V
RESET, WDO Output Voltage 0.4 V I
SINK
= 1.6 mA, V
CC
= 5 V
3.5 V I
SOURCE
= 1 µA, V
CC
= 4.25 V
Output Short Circuit Source Current 1 3 25 µA
Output Short Circuit Sink Current 25 mA
WDI Input Threshold V
CC
= 5 V
1
Logic Low 0.8 V
Logic High 3.5 V
WDI Input Current 20 50 µA WDI = V
OUT
, T
A
= +25°C
–50 –15 µA WDI = 0 V, T
A
= +25°C
POWER FAIL DETECTOR
PFI Input Threshold 1.25 1.3 1.35 V V
CC
= +5 V
PFI Input Current –25 ±0.01 +25 nA
PFO Output Voltage 0.4 V I
SINK
= 3.2 mA
3.5 V I
SOURCE
= 1 µA
PFO Short Circuit Source Current 1 3 25 µA PFI = Low, PFO = 0 V
PFO Short Circuit Sink Current 25 mA PFI = High, PFO = V
OUT
CHIP ENABLE GATING
CE
IN
Threshold 0.8 V V
IL
3.0 V V
IH
CE
IN
Pull-Up Current 3 µA
CE
OUT
Output Voltage 0.4 V I
SINK
= 3.2 mA
V
OUT
– 1.5 V I
SOURCE
= 3.0 mA
V
OUT
– 0.05 V I
SOURCE
= 1 µA, V
CC
= 0 V
CE Propagation Delay 5 9 ns
REV. A
(V
CC
= Full Operating Range, V
BATT
= +2.8 V, T
A
= T
MIN
to
T
MAX
unless otherwise noted)
–2–
Parameter Min Typ Max Units Test Conditions/Comments
OSCILLATOR
OSC IN Input Current ±2 µA
OSC SEL Input Pull-Up Current 5 µA
OSC IN Frequency Range 0 250 kHz OSC SEL = 0 V
OSC IN Frequency with External Capacitor 4 kHz OSC SEL = 0 V, C
OSC
= 47 pF
NOTE
1
WDI is a three level input which is internally biased to 38% of V
CC
and has an input impedance of approximately 125 kΩ.
Specifications subject to change without notice.
ADM690–ADM695
REV. A
–3–
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25°C unless otherwise noted)
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
V
BATT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
All Other Inputs . . . . . . . . . . . . . . . . . . –0.3 V to V
OUT
+ 0.5 V
Input Current
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA
V
BATT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Power Dissipation, N-8 DIP . . . . . . . . . . . . . . . . . . . . 400 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 120°C/W
Power Dissipation, Q-8 DIP . . . . . . . . . . . . . . . . . . . . 500 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 125°C/W
Power Dissipation, N-16 DIP . . . . . . . . . . . . . . . . . . . 600 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 135°C/W
Power Dissipation, Q-16 DIP . . . . . . . . . . . . . . . . . . . 600 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 100°C/W
Power Dissipation, R-16 SOIC . . . . . . . . . . . . . . . . . . 600 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 110°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . . –40°C to +85°C
Extended (S Version) . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300°C
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those listed in the
operational sections of this specification is not implied. Exposure to absolute
maximum ratings for extended periods of time may affect device reliability.
ORDERING GUIDE
Model Temperature Range Package Option
ADM690AN –40°C to +85°C N-8
ADM690AQ –40°C to +85°C Q-8
ADM690SQ –55°C to +125°C Q-8
ADM691AN –40°C to +85°C N-16
ADM691AR –40°C to +85°C R-16
ADM691AQ –40°C to +85°C Q-16
ADM691SQ –55°C to +125°C Q-16
ADM692AN –40°C to +85°C N-8
ADM692AQ –40°C to +85°C Q-8
ADM692SQ –55°C to +125°C Q-8
ADM693AN –40°C to +85°C N-16
ADM693AR –40°C to +85°C R-16
ADM693AQ –40°C to +85°C Q-16
ADM693SQ –55°C to +125°C Q-16
ADM694AN –40°C to +85°C N-8
ADM694AQ –40°C to +85°C Q-8
ADM694SQ –55°C to +125°C Q-8
ADM695AN –40°C to +85°C N-16
ADM695AR –40°C to +85°C R-16
ADM695AQ –40°C to +85°C Q-16
ADM695SQ –55°C to +125°C Q-16
WARNING!
ESD SENSITIVE DEVICE
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADM690–ADM695 features proprietary ESD protection circuitry, permanent
damage may occur on devices subjected to high energy electrostatic discharges. Therefore,
proper ESD precautions are recommended to avoid performance degradation or loss of
functionality.
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ADM695ARZ

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Description:
Supervisory Circuits 5V CMOS MPU IC Battery Mgmt
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