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ADM693AARNZ

P1-P3P4-P6P7-P9P10-P12
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
ADM691A/ADM693A/ADM800L/M
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., 1996
Microprocessor
Supervisory Circuits
FUNCTIONAL BLOCK DIAGRAM
CHIP ENABLE
OUTPUT
CONTROL
V
BATT
V
CC
CE
IN
OSC IN
OSC SEL
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
1
VOLTAGE DETECTOR = 4.4V (ADM693A/ADM800M)
ADM691A/ADM693A
ADM800L/ADM800M
1.25V
WATCHDOG
TIMER
RESET &
WATCHDOG
TIMEBASE
RESET &
GENERATOR
4.65V
1
BATT ON
LOW LINE
V
OUT
CE
OUT
RESET
RESET
WATCHDOG
OUTPUT (WDO)
POWER FAIL
OUTPUT (PFO
)
WATCHDOG
TRANSITION DETECTOR
FEATURES
Low Power Consumption:
Precision Voltage Monitor
62% Tolerance on ADM800L/M
Reset Time Delay—200 ms, or Adjustable
1 mA Standby Current
Automatic Battery Backup Power Switching
Fast Onboard Gating of Chip Enable Signals
Also Available in TSSOP Package (ADM691A)
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical mP Power Monitoring
GENERAL DESCRIPTION
The ADM691A/ADM693A/ADM800L/ADM800M 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 warning. The family of products
provides an upgrade for the MAX691A/93A/800M family of
products.
All parts are available in 16-pin DIP and SO packages. The
ADM691A is also available in a space-saving TSSOP package.
The following functionality is provided:
1. Power-on reset output during power-up, power-down and
brownout conditions. The circuitry remains operational with
V
CC
as low as 1 V.
2. Battery backup switching for CMOS RAM, CMOS micro-
processor or other low power logic.
3. A reset pulse if the optional watchdog timer has not been
toggled within a specified time.
4. A 1.25 V threshold detector for power fail warning, low bat-
tery detection, or to monitor a power supply other than +5 V.
V
BATT
V
CC
CMOS
RAM
CE
IN
OSC IN
OSC SEL
BAT
ON
LOW LINE
V
OUT
CE
OUT
RESET RESET
PFO
WDI
V
CC
WDO
I/O LINE
NMI
A0–A15
µP
POWER
µP
ADDRESS
DECODE
ADM691A
ADM693A
ADM800L
ADM800M
GND
PFI
BATTERY
0.1µF
+5V
NC
R2
R1
INPUT
POWER
7805
SYSTEM
STATUS
INDICATORS
Figure 1. Typical Application
ADM691A/ADM693A/ADM800L/M–SPECIFICATIONS
–2–
REV. 0
(V
CC
= 4.75 V to 5.5 V (ADM691A, ADM800L) 4.5 V to 5.5 V (ADM693A, ADM800M) V
BATT
= +2.8 V, T
A
= T
MIN
to T
MAX
unless otherwise noted)
Parameter Min Typ Max Unit Test Conditions/Comments
BATTERY BACKUP SWITCHING
V
CC
, V
BATT
Operating Voltage Range 0 5.5 V
V
OUT
Output Voltage V
CC
– 0.05 V
CC
– 0.02 V I
OUT
= 25 mA
V
CC
– 0.3 V
CC
– 0.2 V I
OUT
= 250 mA
V
CC
to V
OUT
Output Resistance 0.8 1.2 Ω V
CC
= 4.5 V
V
OUT
in Battery Backup Mode V
BATT
– 0.3 V V
BATT
= 4.5 V, I
OUT
= 20 mA
V
BATT
– 0.25 V V
BATT
= 2.8 V, I
OUT
= 10 mA
V
BATT
– 0.15 V V
BATT
= 2.0 V, I
OUT
= 5 mA
V
BATT
to V
OUT
Output Resistance 12 Ω V
BATT
= 4.5 V
20 Ω V
BATT
= 2.8 V
25 Ω V
BATT
= 2.0 V
Supply Current (Excludes I
OUT
) 70 100 µAV
CC
> (V
BATT
– 1 V)
Supply Current in B. Backup (Excludes I
OUT
) 0.04 1 µAV
CC
< (V
BATT
– 1.2 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(V
BATT
+0.2 V) < V
CC
, T
A
= +25°C
–1.0 +0.02 µA(V
BATT
+0.2 V) < V
CC
Battery Switchover Threshold V
BATT
+ 0.03 V Power Up
V
CC
–V
BATT
V
BATT
– 0.03 V Power Down
Battery Switchover Hysteresis 60 mV
BATT ON Output Voltage Low 0.1 0.4 V I
SINK
= 3.2 mA
0.7 1.5 V I
SINK
= 25 mA
BATT ON Output Short Circuit Current 60 mA Sink Current
1 15 100 µA Source Current
RESET AND WATCHDOG TIMER
Reset Voltage Threshold
ADM691A, ADM800L 4.5 4.65 4.75 V
ADM693A, ADM800M 4.25 4.40 4.50 V
ADM800L, V
CC
Falling 4.55 4.70 V T
A
= +25°C
ADM800M, V
CC
Falling 4.3 4.45 V T
A
= +25°C
Reset Threshold Hysteresis 15 mV
V
CC
to RESET Delay 80 µs Power Down
LOW LINE to RESET Delay 800 ns
Reset Timeout Period Internal Oscillator 140 200 280 ms Power Up
Reset Timeout Period External Clock 2048 Cycles Power Up
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 4096 Cycles Long Period
1024 Cycles Short Period
Minimum WDI Input Pulse Width 100 ns V
IL
= 0.4, V
IH
= 0.75 × V
CC
RESET Output Voltage 0.004 0.3 V I
SINK
= 50 µA, V
CC
= 1 V, V
BATT
= 0 V
0.1 0.4 V I
SINK
= 3.2 mA, V
CC
= 4.25 V
3.5 V I
SOURCE
= 1.6 mA, V
CC
= 5 V
RESET Output Short Circuit Current 7 20 mA
RESET Output Voltage Low 0.1 0.4 V I
SINK
= 3.2 mA
LOW LINE Output Voltage 0.4 V I
SINK
= 3.2 mA, V
CC
= 4.25 V
3.5 V I
SOURCE
= 1 µA, V
CC
= 5 V
LOW LINE Short Circuit Source Current 1 15 100 µA
WDO Output Voltage 0.4 V I
SINK
= 3.2 mA, V
CC
= 4.25 V
3.5 V I
SOURCE
= 500 µA, V
CC
= 5 V
WDO Short Circuit Source Current 3 10 mA
WDI Input Threshold
Logic Low 0.8 V
Logic High 0.75 × V
CC
V
WDI Input Current –50 –10 µA WDI = 0 V
20 50 µA WDI = V
OUT
POWER FAIL DETECTOR
PFI Input Threshold ADM69xA 1.2 1.25 1.3 V V
CC
= 5 V
PFI Input Threshold ADM800L/M 1.225 1.25 1.275 V V
CC
= 5 V
PFI Input Current ±0.01 ±25 nA
PFO Output Voltage 0.4 V I
SINK
= 3.2 mA
3.5 I
SOURCE
= 1 µA
PFO Short Circuit Source Current 1 15 100 µA
PFI to PFO Delay 25 µsV
IN
= –20 mV
60 µsV
IN
= 20 mV
–3–
REV. 0
ADM691A/ADM693A/ADM800L/M
Parameter Min Typ Max Units Test Conditions/Comments
CHIP ENABLE GATING
CE
IN
Leakage Current ±0.005 ±1 µA Disable Mode
CE
IN
to CE
OUT
Resistance 40 150 Ω Enable Mode
CE
IN
to CE
OUT
Propagation Delay 6 10 ns R
IN
= 50 Ω, C
LOAD
= 50 pF
CE
OUT
Short-Circuit Current 0.1 0.75 2.0 mA Disable Mode, CE
OUT
= 0 V
CE
OUT
Output Voltage 3.5 V V
CC
= 5 V, I
OUT
= –100 µA
2.7 V V
CC
= 0 V, V
BATT
= 2.8 V, I
OUT
= 1 µA
RESET to CE
OUT
Propagation Delay 12 µs Power Down
OSCILLATOR
OSC IN Input Current 0.1 ±5 µA OSC SEL = 0 V
OSC In Input Pullup Current 10 100 µA OSC SEL = V
OUT
or Floating
OSC SEL Input Pullup Current 10 100 µA OSC SEL = 0 V
OSC IN Frequency Range 500 kHz OSC SEL = 0 V
OSC IN Threshold Voltage V
OUT
– 0.4 V
OUT
– 0.6 V V
IH
3.65 2.00 V V
IL
OSC IN Frequency with Ext Capacitor 100 kHz OSC SEL = 0 V, C
OSC
= 47 pF
NOTES
1
Either V
CC
or V
BATT
can be 0 V if the other > +2.0 V.
Specifications subject to change without notice.
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
(Peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 mA
V
CC
(Continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA
V
BATT
(Peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA
V
BATT
(Continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . 25 mA
GND, BATT ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 25 mA
Power Dissipation, N-16 DIP . . . . . . . . . . . . . . . . . . 842 mW
θ
ϑA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 135°C/W
Power Dissipation, R-16 Narrow SOIC . . . . . . . . . . . 700 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . .110°W
Power Dissipation, R-16 Wide SOIC . . . . . . . . . . . . . 762 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 110°C/W
Power Dissipation, RU-16 TSSOP . . . . . . . . . . . . . . 500 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 158°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 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.
Table I. Product Selection Table
Power On Low V
CC
Watchdog Battery Backup Base Drive Chip Enable
Part No. Reset Time Threshold Timeout Switching Ext PNP Signals
ADM691A 200 ms or Adj. 4.65 V ± 3% 100 ms, 1.6 s, Adj. Yes Yes Yes
ADM693A 200 ms or Adj. 4.4 V ± 3% 100 ms, 1.6 s, Adj. Yes Yes Yes
ADM800M 200 ms or Adj. 4.4 V ± 2% 100 ms, 1.6 s, Adj. Yes Yes Yes
ADM800L 200 ms or Adj. 4.65 V ± 2% 100 ms, 1.6 s, Adj. Yes Yes Yes
ORDERING GUIDE
Temperature Package
Model Range Option
ADM691AAN –40°C to +85°C N-16
ADM691AARN –40°C to +85°C R-16N
ADM691AARW –40°C to +85°C R-16W
ADM691AARU –40°C to +85°C RU-16
ADM693AAN –40°C to +85°C N-16
ADM693AARN –40°C to +85°C R-16N
ADM693AARW –40°C to +85°C R-16W
ADM800LAN –40°C to +85°C N-16
ADM800LARN –40°C to +85°C R-16N
ADM800LARW –40°C to +85°C R-16W
ADM800MAN –40°C to +85°C N-16
ADM800MARN –40°C to +85°C R-16N
ADM800MARW –40°C to +85°C R-16W
P1-P3P4-P6P7-P9P10-P12

ADM693AARNZ

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Supervisory Circuits IC 5V MPU Battery Mgmt
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