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ADM697AN

P1-P3P4-P6P7-P9P10-P12
FUNCTIONAL BLOCK DIAGRAMS
1.3V
V
OUT
V
BATT
V
CC
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI) POWER FAIL
OUTPUT (PFO)
RESET
WATCHDOG
TIMER
BATT ON
OSC IN
OSC SEL
WATCHDOG
OUTPUT (WDO)
RESET
LOW LINE
LL
IN
RESET GENERATOR
TIMEBASE FOR RESET
AND WATCHDOG
WATCHDOG
TRANSITION DETECTOR
ADM696
1.3V
CE
OUT
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI) POWER FAIL
OUTPUT (PFO)
RESET
WATCHDOG
TIMER
OSC IN
OSC SEL
WATCHDOG
OUTPUT (WDO)
RESET
LOW LINE
LL
IN
RESET GENERATOR
TIMEBASE FOR RESET
AND WATCHDOG
WATCHDOG
TRANSITION DETECTOR
ADM697
CE
IN
REV. 0
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
ADM696/ADM697
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FEATURES
Superior Upgrade for MAX696/MAX697
Specified Over Temperature
Adjustable Low Line Voltage Monitor
Power OK/Reset Time Delay
Reset Assertion Down to 1 V V
CC
Watchdog Timer—100 ms, 1.6 s, or Adjustable
Low Switch On Resistance
1.5 V Normal, 20 V in Backup
600 nA Standby Current
Automatic Battery Backup Switching (ADM696)
Fast On-Board Gating of Chip Enable Signals (ADM697)
Voltage Monitor for Power Fail or Low Battery Warning
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical mP Power Monitoring
GENERAL DESCRIPTION
The ADM696/ADM697 supervisory circuits offer 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 warning.
The ADM696/ADM697 are available in 16-pin DIP and small
outline packages and provide the following functions:
1. Power-On Reset output during power-up, power-down and
brownout conditions. The RESET voltage threshold is
adjustable using an external voltage divider. The
RESET
output remains operational with V
CC
as low as 1 V.
2. A Reset pulse if the optional watchdog timer has not been
toggled within specified time.
3. Separate watchdog time-out and low line status outputs.
4. Adjustable reset and watchdog timeout periods.
5. A 1.3 V threshold detector for power fail warning, low bat-
tery detection, or to monitor a power supply other than V
CC
.
6. Battery backup switching for CMOS RAM, CMOS micro-
processor or other low power logic (ADM696).
7. Write protection of CMOS RAM or EEPROM (ADM697).
The ADM696/ADM697 is fabricated using an advanced epitaxial
CMOS process combining low power consumption (5 mW),
extremely fast Chip Enable gating (5 ns) and high reliability.
RESET assertion is guaranteed with V
CC
as low as 1 V. In
addition, the power switching circuitry is designed for minimal
voltage drop thereby permitting increased output current drive
of up to 100 mA without the need for an external pass transistor.
ADM696/ADM697–SPECIFICATIONS
P
arameter Min Typ Max Units Test Conditions/Comments
V
CC
Operating Voltage Range 3.0 5.5 V
V
BATT
Operating Voltage Range 2.0 V
CC
– 0 3 V
BATTERY BACKUP SWITCHING (ADM696)
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 +0.02 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 0.4 V I
SINK
= 1.6 mA
BATT ON Output Short Circuit Current 7 mA BATT ON = V
OUT
= 2.4 V Sink Current
0.5 1 25 µA BATT ON = V
OUT
, V
CC
= 0 V, Source Current
RESET AND WATCHDOG TIMER
Low Line Threshold (LL
IN
) 1.25 1.3 1.35 V V
CC
= +5 V, +3 V
Reset Timeout Delay 35 50 70 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 4032 4097 Cycles Long Period
960 1025 Cycles Short Period
Minimum WDI Input Pulse Width 50 ns V
IL
= 0.4, V
IH
= 3.5 V, V
CC
= 5 V
RESET Output Voltage @ V
CC
= +1 V 4 200 mV I
SINK
= 10 µA, V
CC
= 1 V
RESET, RESET Output Voltage 0.4 V I
SINK
= 400 µA, V
CC
= 2 V, V
BATT
= 0 V
0.4 V I
SINK
= 1.6 mA, 3 V < V
CC
< 5.5 V
3.5 V I
SOURCE
= 1 µA, V
CC
= 5 V
LOW LINE, WDO Output Voltage 0.4 V I
SINK
= 1.6 mA,
3.5 V I
SOURCE
= 1 µA, V
CC
= 5 V
Output Short Circuit Source Current 1 3 25 µA
WDI Input Threshold V
CC
= 5 V
1
Logic Low 0.8 V
Logic High 3.5 V
WDI Input Current 20 50 µA WD1 = V
OUT
, (V
CC
) T
A
= +25°C
–50 –15 µA WD1 = 0 V, T
A
= +25°C
POWER FAIL DETECTOR
PFI Input Threshold 1.2 1.3 1.4 V V
CC
= +3 V, +5 V
PFI–LL
IN
Threshold Difference –50 ±15 +50 mV V
CC
= +3 V, +5 V
PFI Input Current –25 ±0.01 +25 nA
LL
IN
Input Current –50 ±0.01 +50 nA
PFO Output Voltage 0.4 V I
SINK
= 1.6 mA
3.5 V I
SOURCE
= 1 µA, V
CC
= 5 V
PFO Short Circuit Source Current 1 3 25 µA PFI = Low, PFO = 0 V
CHIP ENABLE GATING (ADM697)
CE
IN
Threshold 0.8 V V
IL
3.0 V V
IH
, V
CC
= 5 V
CE
IN
Pullup Current 3 µA
CE
OUT
Output Voltage 0.4 V I
SINK
= 1.6 mA
V
CC
– 0.5 V I
SOURCE
= 800 µA
CE Propagation Delay 5 25 ns
OSCILLATOR
OSC IN Input Current ±2 µA
OSC SEL Input Pullup Current 5 µA
OSC IN Frequency Range 0 250 kHz OSC SEL = 0 V
OSC IN Frequency with Ext. 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.
REV. 0–2–
(V
CC
= Full Operating Range, V
BATT
= +2.8 V, T
A
= T
MIN
to T
MAX
unless otherwise noted.)
ADM696/ADM697
REV. 0
–3–
ORDERING GUIDE
Model Temperature Range Package Option
ADM696AN –40°C to +85°C N-16
ADM696AR –40°C to +85°C R-16
ADM696AQ –40°C to +85°C Q-16
ADM696SQ –55°C to +125°C Q-16
ADM697AN –40°C to +85°C N-16
ADM697AR –40°C to +85°C R-16
ADM697AQ –40°C to +85°C Q-16
ADM697SQ –55°C to +125°C Q-16
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-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 sec) . . . . . . . . . . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +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.
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 ADM696/ADM697 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.
PIN CONFIGURATIONS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TOP VIEW
(Not to Scale)
ADM696
GND
V
BATT
V
OUT
PFI
PFO
WDO
V
CC
RESET
BATT ON
LOW LINE
OSC IN
OSC SEL
RESET
LL
IN
NC
WDI
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TOP VIEW
(Not to Scale)
ADM697
LL
IN
TEST
NC
PFI
PFO
WDO
V
CC
RESET
GND
LOW LINE
OSC IN
OSC SEL
RESET
CE
IN
CE
OUT
WDI
P1-P3P4-P6P7-P9P10-P12

ADM697AN

Mfr. #:
Buy ADM697AN
Manufacturer:
Analog Devices / Linear Technology
Description:
Supervisory Circuits 5V CMOS SUPERVISORS IC
Lifecycle:
New from this manufacturer.
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