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ADM8697ARW

P1-P3P4-P6P7-P9P10-P12P13-P13
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
WATCHDOG
TRANSITION DETECTOR
TIMEBASE FOR RESET
AND WATCHDOG
ADM8696
1.3V
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
POWER FAIL
OUTPUT (PFO)
RESET
WATCHDOG
TIMER
OSC IN
OSC SEL
RESET
LOW LINE
WATCHDOG
OUTPUT (WDO)
LL
IN
RESET GENERATOR
TIMEBASE FOR RESET
AND WATCHDOG
WATCHDOG
TRANSITION DETECTOR
ADM8697
CE
IN
CE
OUT
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
ADM8696/ADM8697
FEATURES
Upgrade for ADM696/ADM697, 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
0.7 V Normal, 7 V in Backup
400 nA Standby Current
Automatic Battery Backup Switching (ADM8696)
Fast On-Board Gating of Chip Enable Signals (ADM8697)
Voltage Monitor for Power Fail or Low Battery Warning
Also Available in TSSOP Package
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
The ADM8696/ADM8697 is fabricated using an advanced
epitaxial CMOS process combining low power consumption
(0.7 mW), extremely fast Chip Enable gating (2 ns) and high re-
liability.
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.
GENERAL DESCRIPTION
The ADM8696/ADM8697 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 ADM8696/ADM8697 are available in 16-pin DIP and small
outline packages (including TSSOP) 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 out-
put 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 timeout and low line status outputs.
4. Adjustable reset and watchdog timeout periods.
5. A 1.3 V threshold detector for power fail warning, low battery
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 (ADM8696).
7. Write protection of CMOS RAM or EEPROM (ADM8697).
©1997-2010 Analog Devices, Inc. All rights reserved.
REV. A
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
Qualified for Automotive Applications
ADM8696/ADM8697–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 (ADM8696)
V
OUT
Output Voltage V
CC
– 0.005 V
CC
– 0.0025 V I
OUT
= 1 mA
V
CC
– 0.2 V
CC
– 0.125 V I
OUT
≤ 100 mA
V
OUT
in Battery Backup Mode V
BATT
– 0.005 V
BATT
– 0.002 V I
OUT
= 250 µA, V
CC
< V
BATT
– 0.2 V
Supply Current (Excludes I
OUT
) 115 200 µAI
OUT
= 100 mA
Supply Current in Battery Backup Mode 0.4 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 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 30 mA BATT ON = V
OUT
= 2.4 V Sink Current
0.5 2.5 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
Reset Timeout Delay 35 50 70 ms OSC SEL = HIGH
Watchdog Timeout Period, Internal Oscillator 1.0 1.6 2.25 s Long Period
70 100 140 ms Short Period
Watchdog Timeout Period, External Clock 4032 4063 4097 Cycles Long Period
960 1011 1025 Cycles Short Period
Minimum WDI Input Pulse Width 50 ns V
IL
= 0.8, V
IH
= 3.75 V, V
CC
= 5 V
100 ns V
IL
= 0.8, V
IH
= 3.5 V, V
CC
= 5 V
100 ns V
IL
= 0.8, V
IH
= 2.6 V, V
CC
= 3 V
RESET Output Voltage @ V
CC
= +1 V 4 20 mV I
SINK
= 10 µA, V
CC
= 1 V
RESET, RESET Output Voltage 0.1 0.4 V I
SINK
= 400 µA, V
CC
= 2 V, V
BATT
= 0 V
0.1 0.4 V I
SINK
= 3.2 mA, 3 V < V
CC
< 5.5 V
3.5 V I
SOURCE
= 1 µA, V
CC
= 5 V
2.7 V I
SOURCE
= 1 µA, V
CC
= 3 V
LOW LINE, WDO Output Voltage 0.4 V I
SINK
= 3.2 mA,
3.5 V I
SOURCE
= 1 µA, V
CC
= 5 V
2.7 V I
SOURCE
= 1 µA, V
CC
= 3 V
Output Short Circuit Source Current 1 10 25 µAV
CC
= 5 V
WDI Input Threshold
1
Logic Low 0.8 V
Logic High 3.5 V V
CC
= 5 V
1.2 V V
CC
= 3 V
WDI Input Current 1 10 µA WD1 = V
OUT
, (V
CC
)
–10 –1 µA WD1 = 0 V
POWER FAIL DETECTOR
PFI Input Threshold 1.2 1.3 1.4 V
PFI–LL
IN
Threshold Difference –50 ± 15 +50 mV
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
= 3.2 mA
3.5 V I
SOURCE
= 1 µA
2.7 V I
SOURCE
= 1 µA, V
CC
= 3 V
PFO Short Circuit Source Current 1 10 25 µA PFI = Low, PFO = 0 V
CHIP ENABLE GATING (ADM8697)
CE
IN
Threshold 0.8 V V
IL
3.0 V V
IH
1.2 V V
CC
= 3 V
CE
IN
Pull-Up Current 3 µA
CE
OUT
Output Voltage 0.4 V I
SINK
= 3.2 mA
V
CC
– 0.5 V I
SOURCE
= 800 µA
CE Propagation Delay 2 7 ns V
CC
= 5.0 V
4nsV
CC
= 3.0 V
OSCILLATOR
OSC IN Input Current ± 2 µA
OSC SEL Input Pull-Up Current 5 µA
OSC IN Frequency Range 0 500 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 internally biased to 38% of V
CC
and has an input impedance of approximately 5 MΩ.
Specifications subject to change without notice.
–2–
(V
CC
= Full Operating Range, V
BATT
= +2.8 V, T
A
= T
MIN
to T
MAX
unless otherwise noted.)
REV. A
ADM8696/ADM8697
–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-16 DIP . . . . . . . . . . . . . . . . . . . 600 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 135°C/W
Power Dissipation, RU-16 TSSOP . . . . . . . . . . . . . . . 500 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 158°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
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 perma-
nent damage to the device. This is a stress rating only; 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 ADM8696/ADM8697 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)
ADM8696
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)
ADM8697
LL
IN
TEST
NC
PFI
PFO
WDO
V
CC
RESET
GND
LOW LINE
OSC IN
OSC SEL
RESET
CE
IN
CE
OUT
WDI
REV. A
P1-P3P4-P6P7-P9P10-P12P13-P13

ADM8697ARW

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Manufacturer:
Analog Devices / Linear Technology
Description:
Supervisory Circuits IMPROVED ADM697 I.C
Lifecycle:
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