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FEATURES Specified Over Temperature Low Power Consumption (17 A) Precision Voltage Monitor: 3 V, 5 V Options Reset Assertion Down to 1 V VCC 30 ms min Power-On Reset Logic Low RESET Output APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems
VCC VREF
Microprocessor Supervisory Circuit ADM809-5S/L
FUNCTIONAL BLOCK DIAGRAM
ADM809-5S/L
RESET GENERATOR 55ms
RESET
GND
GENERAL DESCRIPTION
VCC VCC VCC RESET INPUT P SYSTEM GND
The ADM809-5S/L supervisory circuits monitor the power supply voltage in microprocessor systems. It provides a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 55 ms. This holds the microprocessor in a reset state until conditions have stabilized. The RESET output remains operational with VCC as low as 1 V. The ADM809-5S/L provides an active low reset signal (RESET). The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC. The ADM809-5S/L consumes only 17 A, making it suitable for low power portable equipment.
ADM809-5S/L
RESET
GND
Figure 1. Typical Operating Circuit
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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 2000
ADM809-5S/L-SPECIFICATIONS Models unless otherwise noted.)
Parameter VCC Operating Voltage Range Min 1.0 1.2 Supply Current Typ Max 3.3 3.3 24 17 5.5 5.5 60 50 100 100 Unit V V A A A A
(VCC = Full Operating Range, TA = TMIN to TMAX, VCC typ = 5 V for L, 3.3 V for S
Test Conditions/Comments TA = 0C to +150C with 100 k Pull-Down on Output (Figure 3) TA = -40C to +150C with 22 k External Pull-Up on Output (Figure 6) VCC < 5.5 V, ADM8_L, TA = -40C to +85C VCC < 3.6 V, ADM8_S, TA = -40C to +85C VCC < 5.5 V, ADM8_L, TA = +85C to +150C VCC < 3.6 V, ADM8_S, TA = +85C to +150C
RESET THRESHOLD Reset Voltage Threshold ADM809-5L ADM809-5L ADM809-5S ADM809-5S Reset Threshold Temperature Coefficient VCC to Reset Delay Reset Active Timeout Period RESET Output Voltage Low
4.5 4.40 2.85 2.78 30 20 30 55
4.75 4.86 3.00 3.08
V V V V
TA = -40C to +85C TA = +85C to +150C TA = -40C to +85C TA = +85C to +150C
ppm/C s VCC = VTH to (VTH -100 mV) 80 0.3 0.4 0.3 ms V V V V V +150 C JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 333C/W Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300C Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220C Storage Temperature Range . . . . . . . . . . . . . -65C to +150C
*Stresses above those listed under Absolute Maximum Ratings may cause permanent 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.
TA = -40C to +150C VCC = VTH min, ISINK = 1.2 mA, ADM809-5S VCC = VTH min, ISINK = 3.2 mA, ADM809-5L VCC >1.0 V, ISINK = 50 A, TA = 0C to +150C VCC >1.2 V, ISINK = 50 A, TA = -40C to +150C VCC > VTH max, ISOURCE = 500 A VCC > VTH max, ISOURCE = 800 A
RESET Output Voltage High JUNCTION TEMPERATURE
ABSOLUTE MAXIMUM RATINGS*
(TA = 25C unless otherwise noted)
0.8 VCC VCC - 1.5 -40
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V RESET, RESET . . . . . . . . . . . . . . . . . . -0.3 V to VCC + 0.5 V Input Current VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Output Current RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Rate of Rise, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/s Power Dissipation, RT-3 SOT-23 Derate by 4 mW/C above 70C . . . . . . . . . . . . . . . 320 mW
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 ADM809-5S/L 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.
WARNING!
ESD SENSITIVE DEVICE
-2-
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ADM809-5S/L
PIN FUNCTION DESCRIPTION
Pin 1 2
Mnemonic GND RESET
Function 0 V. Ground reference for all signals. Active Low Logic Output. RESET remains low while VCC is below the reset threshold, and remains low for 55 ms (typ) after VCC rises above the reset threshold Supply voltage being monitored.
VCC RESET
VREF
VREF
VREF
VREF
t1
t1
t1 = RESET TIME = 55ms TYP. VREF = RESET VOLTAGE THRESHOLD
Figure 2. Power Fail Reset Timing
3
V CC
Table I. RESET Threshold Options
Model
PIN CONFIGURATION
RESET Threshold 4.63 V 2.93 V
ADM809-5LART ADM809-5SART
GND 1
ADM8095S/L
TOP VIEW (Not to Scale)
3 VCC
RESET 2
ORDERING GUIDE
Model ADM809-5LART-REEL ADM809-5LART-REEL-7 ADM809-5SART-REEL ADM809-5SART-REEL-7 ADM809-5SCHIPS
Reset Threshold 4.63 V 4.63 V 2.93 V 2.93 V 2.93 V
Temperature Range -40C to +150C -40C to +150C -40C to +150C -40C to +150C -40C to +150C
Branding Information M9L M9L M9S M9S NA
Quantity 10K 3K 10K 3K 1 Wafer
REV. 0
-3-
ADM809-5S/L -Typical Performance Characteristics
30 VCC = 5V
400 350 300
200 180 160
VOD = VTH - VCC VOD = 10mV
25
SUPPLY CURRENT
VCC = 3V
TITLE
250 200 150 100 ADM8_L/M
RESET DELAY
20 15 10 5 0 -40
140 120 100 80 60 40 VOD = 100mV VOD = 200mV -20 0 20 40 60 TEMPERATURE - C 80 85 VOD = 20mV
VCC = 1V -20 0 20 40 60 TEMPERATURE - C 80 85
50 ADM8_R/S/T 0 1 10 TITLE 100 1000
20 0 -40
TPC 1. Supply Current vs. Temperature (No Load)
TPC 2. Maximum Transient Duration Without Causing a RESET Pulse vs. RESET Comparator Overdrive
1.002 1.0015 1.001 1.0005 1.0
TPC 3. Power-Down RESET Delay vs. Temperature ADM809-5L
180 160 140
VOD = VTH - VCC VOD = 10mV
RESET DELAY
100 80 60 40 20 0 -40
VOD = 20mV
VOD = 100mV
THRESHOLD
80 85
120
0.9995
VOD = 200mV -20 0 20 40 60 TEMPERATURE - C
0.999 -40
-20
0 20 40 60 TEMPERATURE - C
80 85
TPC 4. Power-Down RESET Delay vs. Temperature ADM809-5S
TPC 5. Normalized RESET Voltage Threshold vs. Temperature
-4-
REV. 0
ADM809-5S/L
INTERFACING TO OTHER DEVICES OUTPUT
The ADM809-5S/L is designed to integrate with as many devices as possible and therefore has an output dependant on VCC. Because of this design approach, interfacing this device to other devices is simplified.
ENSURING A VALID RESET OUTPUT DOWN TO V CC = 0 V
PRIORITY ENCODER 74LS147 VCC
4 LINE BCD TO P
When VCC falls below 0.8 V, ADM809-5S/L's RESET no longer sinks current. A high impedance CMOS logic input connected to RESET may, therefore, drift to undetermined logic levels. To eliminate this problem a 100 k resistor should be connected from RESET to ground.
VCC
VCC
ADM809
RESET OTHER SENSING DEVICES
GND
VCC
Figure 4. Interfacing to Ps with Multiple Interrupts
ADM809-5S/L
RESET 100nF 100k VCC 47k 47k 3.3V
GND
RESET
ADM809-5S/L
GND
Figure 3. Ensuring a Valid RESET Output Down to VCC = 0 V
THE BENEFITS OF A VERY ACCURATE RESET THRESHOLD
Figure 5. Alternative Application Circuit with Extra Decoupling
In other microprocessor supervisory circuits, tolerances in supply voltages lead to an overall increase in RESET tolerance levels due to the deterioration of the microprocessor RESET circuit's power supply. The possibility of a malfunction during a power failure is greatly reduced because the ADM809-5S/L series can operate effectively even when there are large degradations of the supply voltages. Another advantage of the ADM809-5S/L series is its very accurate internal voltage reference circuit. These benefits combine to produce an exceptionally reliable Voltage Monitor Circuit.
INTERFACING TO MICROPROCESSORS WITH MULTIPLE INTERRUPTS
3.3V 100nF
VCC 22k
RESET
ADM809-5S/L
GND
In a number of cases it is necessary to interface many interrupts from different devices (i.e., thermal, attitude, and velocity sensors). The ADM809-5S/L can easily be integrated into existing interrupt-handling circuits (Figure 6) or used as a stand-alone device.
Figure 6. Additional Decoupling Can Be Achieved Using a 100 nF Capacitor Between VCC and Ground
REV. 0
-5-
ADM809-5S/L
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Surface Mount Package RT-3
0.1200 (3.048) 0.1102 (2.799)
0.0550 (1.397) 0.0470 (1.194) PIN 1 0.0236 (0.599) 0.0177 (0.450)
3 1 2
0.1040 (2.642) 0.0827 (2.101)
0.0413 (1.049) 0.0374 (0.950) 0.0807 (2.050) 0.0701 (1.781) 0.0440 (1.118) 0.0320 (0.813) 0.0210 (0.533) 0.0146 (0.371) 0.0100 (0.254) 0.0050 (0.127) 0.0059 (0.150) 0.0034 (0.086)
0.0040 (0.102) 0.0005 (0.013) SEATING PLANE
0.027 (0.686) REF
-6-
REV. 0
PRINTED IN U.S.A.
C00090-2.5-9/00 (rev. 0)

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