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ADM8698ANZ

P1-P3P4-P4
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
ADM8698/ADM8699
FUNCTIONAL BLOCK DIAGRAM
RESET
GENERATOR
4.65V
V
CC
WATCHDOG
INPUT
WDI*
ADM8698/
ADM8699
RESET
WATCHDOG
OUTPUT WDO*
RESET*
*
WDI (ADM8699 ONLY)
RESET (SOIC ONLY)
WDO (ADM8699 SOIC ONLY)
WATCHDOG
TRANSITION DETECTOR
(1 sec)
TYPICAL APPLICATION CIRCUIT
*
ADM8699 ONLY
+5V
V
CC
WDI
*
GND
ADM8698/
ADM8699
RESET
µP POWER
µP SYSTEM
I/O LINE
µP RESET
FEATURES
Superior Up
grade for ADM698/ADM699, MAX698/MAX699
Guaranteed
RESET Assertion with V
CC
= 1 V
Low 70 mA Supply Current
Precision 4.65 V Voltage Monitor
Power OK/Reset Time Delay
Watchdog Timer
Minimum Component Count
Performance Specified over Temperature
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical mP Power Monitoring
GENERAL DESCRIPTION
The ADM8698/ADM8699 supervisory circuits provide power
supply monitoring and watchdog timing for microprocessor
systems.
The ADM8698 monitors the 5 V V
CC
power supply and gener-
ates a
RESET pulse during power up, power down and during
low voltage “Brown Out” conditions. The
RESET output is
guaranteed to be functional (logic low) with V
CC
as low as 1 V.
The ADM8699 features an identical monitoring circuit as in the
ADM8698, plus an additional watchdog timer input to monitor
microprocessor activity. The
RESET output is forced low if the
watchdog input is not toggled within the 1 second watchdog
timeout period.
Both parts are available in 8-pin plastic DIP/SOIC and 16-lead
SOIC packages. The 16-lead SOIC contains additional out-
puts
RESET (without inversion) and Watchdog Output WDO
(ADM8699 only).
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 © Analog Devices, Inc., 1997
REV. 0
–2–
ORDERING GUIDE
Temperature Package
Model Range Options*
ADM8698AN –40°C to +85°C N-8
ADM8698ARW –40°C to +85°C R-16
ADM8698ARN –40°C to +85°C R-8
ADM8699AN –40°C to +85°C N-8
ADM8699ARW –40°C to +85°C R-16
ADM8699ARN –40°C to +85°C R-8
*N = Plastic DIP; R = Small Outline.
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25°C unless otherwise noted)
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
All Other Inputs . . . . . . . . . . . . . . . . . . . –0.3 V to V
CC
+ 0.3 V
Power Dissipation 8-Pin DIP . . . . . . . . . . . . . . . . . . . .500 mW
θ
JA
, Thermal Impedance . . . . . . . . . . . . . . . . . . . . +120°C/W
Power Dissipation 16-Pin SOIC . . . . . . . . . . . . . . . . .375 mW
θ
JA
, Thermal Impedance . . . . . . . . . . . . . . . . . . . . +110°C/W
Power Dissipation 8-Pin SOIC . . . . . . . . . . . . . . . . . .500 mW
θ
JA
, Thermal Impedance . . . . . . . . . . . . . . . . . . . . +125°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . .–40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . .–65°C to +150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300°C
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .>4 kV
*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.
(V
CC
= +5 V 6 10%, T
A
= T
MIN
to T
MAX
unless otherwise noted)
ADM8698/ADM8699–SPECIFICATIONS
Parameter Min Typ Max Units Test Conditions/Comments
V
CC
Operating Voltage Range 3.0 5.5 V
Supply Current 70 100 µA
Power-Down Reset Assertion 4.5 4.65 4.75 V
Power-Up Reset Deassertion
Reset Threshold Hysteresis 40 mV
Reset Active Time 140 200 280 ms
Watchdog Timeout Period (ADM8699) 1.0 1.6 2.25 s
Minimum WDI Input Pulse Width 50 ns V
IL
= 0.4, V
IH
= 0.8 (V
CC
)
RESET Output Voltage 0.4 V I
SINK
= 3.2 mA, V
CC
= 4.4 V
RESET Output Voltage (V
CC
= 1 V) 12 200 mV I
SINK
= 100 µA, V
CC
= 1.0 V
3.5 V I
SOURCE
= 500 µA, V
CC
= 5 V
RESET and
WDO Output Voltage 0.4 V I
SINK
= 3.2 mA, V
CC
= 5 V
3.5 V I
SOURCE
= 1 µA, V
CC
= 4.4 V
RESET Output Short Circuit Current 45 mA Output Sink Current
WDI Input Threshold (ADM8699)
Logic Low 0.8 V
Logic High 3.5 V
WDI Input Current +1 +10 µA WDI = V
CC
–10 –1 µA WDI = 0 V
Specifications subject to change without notice.
ADM8698/ADM8699
REV. 0
–3–
PIN FUNCTION DESCRIPTIONS
Mnemonic Function
V
CC
+5 V Power Supply Input.
GND 0 V. Ground reference for all signals.
RESET Logic Output. RESET goes low whenever V
CC
falls below the reset voltage threshold (4.65 V
typ).
RESET remains low for a minimum of
140 ms after V
CC
returns to 5 V. RESET also
goes low for a minimum of 140 ms if the watchdog
timer is enabled but not serviced within its time-
out period.
WDI Watchdog Input. WDI is a three level input. If
WDI remains either high or low for longer than
the watchdog timeout period,
RESET pulses low
and
WDO goes low. The timer resets with each
transition on the WDI line. The watchdog timer
may be disabled if WDI is left floating or is driven
to midsupply.
RESET (SOIC packages only) Logic Output. RESET is
an active high output. It is the inverse of
RESET.
WDO (SOIC ADM8699 only) Logic Output. The
Watchdog Output,
WDO, goes low if WDI
remains either high or low for longer than the
watchdog timeout period.
WDO is set high by the
next transition at WDI. If WDI is unconnected or
at midsupply, the watchdog timer is disabled and
WDO remains high.
PIN CONFIGURATIONS
8-Lead DIP & SOIC
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
O
TOP VIEW
(Not to Scale)
ADM8698/
ADM8699
V
CC
V
CC
GND
GND
GND
NC (WDI)*
NC
*( ) ADM8699 ONLY
RESET
NC = NO CONNECT
16-Lead SOIC
1
2
3
4
16
15
14
13
TOP VIEW
(Not to Scale)
O
5
12
611
710
89
TOP VIEW
(Not to Scale)
ADM8698/
ADM8699
GND
V
CC
V
CC
GND
NC
NC
NC
NC
RESET
NC
NC
NC (WDI)
*
NC
GND
RESET
NC (WDO)
*
*( ) ADM8699 ONLY
NC = NO CONNECT
TYPICAL PERFORMANCE CURVES
10
90
100
0%
1V
A4
500ms
3.36 V
1V
Figure 1. RESET Output Voltage vs. V
CC
TEMPERATURE – °C
–50 90–30 –10 10 30 50 70
230
170
RESET DELAY – ms
200
220
210
190
180
Figure 2. RESET Timeout Delay vs. Temperature
TEMPERATURE – °C
–60 –30 0 30 60 90 120
4.69
4.57
RESET VOLTAGE THRESHOLD – V
4.63
4.67
4.65
4.61
4.59
4.55
Figure 3. RESET Voltage Threshold vs. Temperature
P1-P3P4-P4

ADM8698ANZ

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Manufacturer:
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Description:
Supervisory Circuits IMPROVED ADM698
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