ADM693AARWZ Analog Devices Inc, ADM693AARWZ Datasheet

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ADM693AARWZ

Manufacturer Part Number
ADM693AARWZ
Description
IC,Power Supply Supervisor,CMOS,SOP,16PIN,PLASTIC
Manufacturer
Analog Devices Inc
Type
Battery Backup Circuitr
Datasheet

Specifications of ADM693AARWZ

Number Of Voltages Monitored
1
Output
Open Drain, Push-Pull
Reset
Active High/Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
4.4V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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a
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 P 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
2. Battery backup switching for CMOS RAM, CMOS micro-
3. A reset pulse if the optional watchdog timer has not been
4. A 1.25 V threshold detector for power fail warning, low bat-
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.
brownout conditions. The circuitry remains operational with
V
processor or other low power logic.
toggled within a specified time.
tery detection, or to monitor a power supply other than +5 V.
FEATURES
Low Power Consumption:
Precision Voltage Monitor
Reset Time Delay—200 ms, or Adjustable
1 A 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 P Power Monitoring
CC
2% Tolerance on ADM800L/M
as low as 1 V.
ADM691A/ADM693A/ADM800L/M
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
POWER FAIL
WATCHDOG
INPUT (WDI)
INPUT (PFI)
POWER
INPUT
OSC SEL
R1
R2
OSC IN
V
BATT
CE
V
CC
IN
BATTERY
7805
FUNCTIONAL BLOCK DIAGRAM
1.25V
4.65V
1
VOLTAGE DETECTOR = 4.4V (ADM693A/ADM800M)
WATCHDOG
TRANSITION DETECTOR
TIMEBASE
RESET &
Figure 1. Typical Application
1
NC
WATCHDOG
World Wide Web Site: http://www.analog.com
+5V
V
GND
OSC IN
OSC SEL
PFI
Supervisory Circuits
BATT
LOW LINE
CHIP ENABLE
CONTROL
OUTPUT
V
INDICATORS
CC
ADM691A
ADM693A
ADM800L
ADM800M
ADM691A/ADM693A
ADM800L/ADM800M
SYSTEM
STATUS
GENERATOR
RESET &
BAT
BATT ON
ON
Microprocessor
WDO
RESET
CE
V
CE
PFO
WDI
OUT
OUT
© Analog Devices, Inc., 1996
IN
WATCHDOG
0.1µF
TIMER
ADDRESS
DECODE
RESET
I/O LINE
NMI
CMOS
RAM
V
CC
A0–A15 µP
LOW LINE
V
CE
RESET
RESET
WATCHDOG
OUTPUT (WDO)
POWER FAIL
OUTPUT (PFO)
OUT
OUT
POWER
µP

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ADM693AARWZ Summary of contents

Page 1

FEATURES Low Power Consumption: Precision Voltage Monitor 2% Tolerance on ADM800L/M Reset Time Delay—200 ms, or Adjustable 1 A Standby Current Automatic Battery Backup Power Switching Fast Onboard Gating of Chip Enable Signals Also Available in TSSOP Package (ADM691A) ...

Page 2

ADM691A/ADM693A/ADM800L/M–SPECIFICATIONS ( 5.5 V (ADM691A, ADM800L) 4 5.5 V (ADM693A, ADM800M Parameter BATTERY BACKUP SWITCHING Operating Voltage Range CC BATT V Output Voltage OUT Output Resistance ...

Page 3

Parameter CHIP ENABLE GATING CE Leakage Current Resistance IN OUT Propagation Delay IN OUT CE Short-Circuit Current OUT CE Output Voltage OUT RESET to CE Propagation Delay OUT OSCILLATOR OSC IN Input Current ...

Page 4

ADM691A/ADM693A/ADM800L/M Pin Mnemonic Function 1 V Backup Battery Input. Connect to external battery or capacitor. Connect to ground if a backup battery is BATT not used Output Voltage, V OUT tial. When V When V is lower than ...

Page 5

Typical Performance Curves– 100 –50 – TEMPERATURE – C Figure 2. I vs. Temperature: Normal Operation –50 –30 – ...

Page 6

ADM691A/ADM693A/ADM800L 0.5 1.0 1.5 2.0 2.5 3.0 V – Figure 8. Battery Current vs. Input Supply Voltage 100 LONG WATCHDOG TIMEOUT PERIOD 10 RESET ACTIVE TIMEOUT ...

Page 7

Figure 14. RESET Output Voltage vs. Supply POWER FAIL RESET OUTPUT RESET is an active low output that provides a reset signal to the Microprocessor whenever invalid level. When V CC ...

Page 8

ADM691A/ADM693A/ADM800L/M Changing the Watchdog and Reset Timeout The watchdog and reset timeout periods may be controlled us- ing OSC SEL and OSC IN. Please refer to Table II. With both these inputs floating (or connected to V reset timeout is ...

Page 9

OSC SEL ADM69_A ADM800_ 7 OSC IN C OSC Figure 18d. Internal Oscillator (100 ms Watchdog) WDI WDO t 2 RESET RESET TIME NORMAL (SHORT) WATCHDOG TIMEOUT PERIOD ...

Page 10

ADM691A/ADM693A/ADM800L/M APPLICATIONS INFORMATION INCREASING THE DRIVE CURRENT If the continuous output current requirements at V 250 lower V –V voltage differential is desired OUT external PNP pass transistor may be connected in parallel with ...

Page 11

RAM Write Protection The CE line drives the Chip Select inputs of the CMOS OUT RAM. CE follows CE as long as V OUT IN threshold falls below the reset threshold high, independent of the logic ...

Page 12

ADM691A/ADM693A/ADM800L/M 16-Lead Plastic DIP (N-16) 0.840 (21.33) 0.745 (18.93 0.280 (7.11) 0.240 (6.10 PIN 1 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) 0.100 0.070 (1.77) SEATING 0.022 (0.558) PLANE ...

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