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ADM810SART-REEL-7

Datasheet ADM810SART-REEL-7, ADM810SART-REEL, ADM810RART-REEL7, ADM810MART-REEL-7, ADM810LART-REEL-7 Datasheet (Analog Devices)

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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
ADM809/ADM810
Microprocessor
Supervisory Circuit in 3-Pin SOT-23
FUNCTIONAL BLOCK DIAGRAM
V
REF
V
CC
RESET
GENERATOR
240ms
ADM809/ADM810
RESET
(RESET)
GND
FEATURES Superior Upgrade for MAX809/MAX810 Specified Over Temperature Low Power Consumption (17 mA) Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options Reset Assertion Down to 1 V V
CC
140 ms min Power-On Reset
Logic Low RESET Output (ADM809) Logic High RESET Output (ADM810)
APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems
GENERAL DESCRIPTION
The ADM809/ADM810 supervisory circuits monitor the power supply voltage in microprocessor systems. They pro­vide a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 240 ms. This holds the microprocessor in a reset state until conditions have stabilized. The RESET output remains operational with V
CC
as low as 1 V. The
ADM809 provides an active low reset signal (RESET) while the ADM810 provides an active high signal (RESET) output.
Six reset threshold voltage options are available suitable for monitoring a variety of supply voltages. Refer to Table I.
The reset comparator features built-in glitch immunity, making it immune to fast transients on V
CC
.
The ADM809/ADM810 consumes only 17 µA, making it
suitable for low power portable equipment. It is packaged in a 3-pin SOT-23 package.
RESET
RESET
INPUT
GND GND
V
CC
V
CC
µP
SYSTEM
ADM809
V
CC
Figure 1. Typical Operating Circuit
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ADM809/ADM810–SPECIFICATIONS
Parameter Min Typ Max Units Test Conditions/Comments
V
CC
Operating Voltage Range 1.0 5.5 V T
A
= 0°C to +70°C
1.2 5.5 V T
A
= –40°C to +105°C
Supply Current 24 60 µAV
CC
< 5.5 V, ADM8_L/M, T
A
= –40°C to +85°C
17 50 µAV
CC
< 3.6 V, ADM8_R/S/T, T
A
= –40°C to +85°C
100 µAV
CC
< 5.5 V, ADM8_L/M, T
A
= +85°C to +105°C
100 µAV
CC
< 3.6 V, ADM8_R/S/T, T
A
= +85°C to +105°C
RESET THRESHOLD
Reset Voltage Threshold
ADM8_L 4.56 4.63 4.70 V T
A
= +25°C
ADM8_L 4.5 4.75 V T
A
= –40°C to +85°C
ADM8_L 4.40 4.86 V T
A
= +85°C to +105°C
ADM8_M 4.31 4.38 4.45 V T
A
= +25°C
ADM8_M 4.25 4.5 V T
A
= –40°C to +85°C
ADM8_M 4.16 4.56 V T
A
= +85°C to +105°C
ADM8_␣ J 3.93 4.00 4.06 V T
A
= +25°C
ADM8_ J 3.89 4.10 V T
A
= –40°C to +85°C
ADM8_ J 3.80 4.20 V T
A
= +85°C to +105°C
ADM8_T 3.04 3.08 3.11 V T
A
= +25°C
ADM8_T 3.00 3.15 V T
A
= –40°C to +85°C
ADM8_T 2.92 3.23 V T
A
= +85°C to +105°C
ADM8_S 2.89 2.93 2.96 V T
A
= +25°C
ADM8_S 2.85 3.00 V T
A
= –40°C to +85°C
ADM8_S 2.78 3.08 V T
A
= +85°C to +105°C
ADM8_R 2.59 2.63 2.66 V T
A
= +25°C
ADM8_R 2.55 2.70 V T
A
= –40°C to +85°C
ADM8_R 2.50 2.76 V T
A
= +85°C to +105°C
Reset Threshold Temperature Coefficient 30 ppm/°C
V
CC
to Reset Delay 20 µsV
CC
= VTH to (VTH –100 mV)
Reset Active Timeout Period 140 240 560 ms T
A
= –40°C to +85°C
100 840 ms T
A
= +85°C to +105°C
RESET Output Voltage Low (ADM809) 0.3 V VCC = VTH min, I
SINK
= 1.2 mA, ADM809R/S/T
0.4 V V
CC
= VTH min, I
SINK
= 3.2 mA, ADM809L/M
0.3 V VCC >1.0 V, I
SINK
= 50 µA
RESET Output Voltage High (ADM809) 0.8 V
CC
VV
CC
> VTH max, I
SOURCE
= 500 µA, ADM809R/S/T
VCC–1.5 V VCC > VTH max, I
SOURCE
= 800 µA, ADM809L/M
RESET Output Voltage Low (ADM810) 0.3 V V
CC
= VTH min, I
SINK
= 1.2 mA, ADM810R/S/T
0.4 V VCC = VTH min, I
SINK
= 3.2 mA, ADM810L/M
RESET Output Voltage High (ADM810) 0.8 V
CC
V 1.8 V < VCC < VTH min, I
SOURCE
= 150 µA
(VCC = Full Operating Range, TA = T
MIN
to T
MAX
, VCC typ = 5 V for L/M/J, 3.3 V
for T/S, 3 V for R Models unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
RESET, RESET . . . . . . . . . . . . . . . . . . –0.3 V to Vcc + 0.5 V
Input Current
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Output Current
RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Rate of Rise, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/µs
Power Dissipation, RT-3 SOT-23 . . . . . . . . . . . . . . . . 320 mW
Derate by 4 mW/°C above +70°C
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . 333°C/W
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 ADM809/ADM810 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.
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ADM809/ADM810
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PIN FUNCTION DESCRIPTION
Pin Mnemonic Function
1 GND 0 V. Ground reference for all signals.
2 RESET (ADM809) Active Low Logic Output. RESET
remains low while V
CC
is below the reset threshold, and remains low for 240 ms (typ) after V
CC
rises above the reset threshold
2 RESET (ADM810) Active High Logic Output. RESET
remains high while V
CC
is below the reset threshold, and remains high for 240 ms (typ) after V
CC
rises above the reset threshold.
3V
CC
Supply voltage being monitored.
PIN CONFIGURATION
1
2
TOP VIEW
(Not to Scale)
ADM809/ ADM810
GND
3
RESET, RESET
V
CC
RESET, RESE
T
V
CC
RESET
t1 t1
V
REF
V
REF
V
REF
V
REF
t1 = RESET TIME = 240ms TYP. V
REF
= RESET VOLTAGE THRESHOLD
Figure 2. Power Fail Reset Timing
Table I. Reset Threshold Options
RESET
Model Threshold
ADM809LART 4.63 V ADM809MART 4.38 V ADM809JART 4.00 V ADM809TART 3.08 V ADM809SART 2.93 V ADM809RART 2.63 V
ADM810LART 4.63 V ADM810MART 4.38 V ADM810JART 4.00 V ADM810TART 3.08 V ADM810SART 2.93 V ADM810RART 2.63 V
ORDERING GUIDE
Reset Temperature Brand
Model* Threshold Range Information Quantity
ADM809LART-REEL 4.63 V –40°C to +105°C 9LXX 10K ADM809LART-REEL-7 4.63 V –40°C to +105°C 9LXX 3K ADM809MART-REEL 4.38 V –40°C to +105°C 9MXX 10K ADM809MART-REEL-7 4.38 V –40°C to +105°C 9MXX 3K ADM809JART-REEL 4.00 V –40°C to +105°C 9JXX 10K ADM809JART-REEL-7 4.00 V –40°C to +105°C 9JXX 3K ADM809TART-REEL 3.08 V –40°C to +105°C 9TXX 10K ADM809TART-REEL-7 3.08 V –40°C to +105°C 9TXX 3K ADM809SART-REEL 2.93 V –40°C to +105°C 9SXX 10K ADM809SART-REEL-7 2.93 V –40°C to +105°C 9SXX 3K ADM809RART-REEL 2.63 V –40°C to +105°C 9RXX 10K ADM809RART-REEL-7 2.63 V –40°C to +105°C 9RXX 3K
ADM810LART-REEL 4.63 V –40°C to +105°C ALXX 10K ADM810LART-REEL-7 4.63 V –40°C to +105°C ALXX 3K ADM810MART-REEL 4.38 V –40°C to +105°C AMXX 10K ADM810MART-REEL-7 4.38 V –40°C to +105°C AMXX 3K ADM810JART-REEL 4.00 V –40°C to +105°C AJXX 10K ADM810JART-REEL-7 4.00 V –40°C to +105°C AJXX 3K ADM810TART-REEL 3.08 V –40°C to +105°C ATXX 10K ADM810TART-REEL-7 3.08 V –40°C to +105°C ATXX 3K ADM810SART-REEL 2.93 V –40°C to +105°C ASXX 10K ADM810SART-REEL-7 2.93 V –40°C to +105°C ASXX 3K ADM810RART-REEL 2.63 V –40°C to +105°C ARXX 10K ADM810RART-REEL-7 2.63 V –40°C to +105°C ARXX 3K
*Only available in Reels.
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ADM809/ADM810
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TEMPERATURE – C
30
0
–40 –20
020406080
25
20
15
10
5
85
VCC = 5V
VCC = 3V
VCC = 1V
Figure 3. Supply Current vs. Tem­perature (ADM8_L/M/R/S/T) (No Load)
TEMPERATURE – C
235
–40 –20
020406080
235.5
236
236.5
237
237.5
238
238.5
239
239.5
240
85
Figure 6. Power-Down RESET Delay vs. Temperature ADM8_R
—Typical Performance Characteristics
TEMPERATURE – C
0
–40 –20
020406080
20
40
60
80
100
120
140
160
180
200
85
VOD = VTH – V
CC
VOD = 20mV
VOD = 100mV
VOD = 200mV
VOD = 10mV
Figure 4. Power-Down RESET Delay vs. Temperature ADM8_L/M
TEMPERATURE – C
0.999 –40 –20
0 20406080
1.002
1.0015
1.001
1.0005
1.0
0.9995
85
Figure 7. Normalized RESET Voltage Threshold vs. Temperature
ADM8_L/M
400
350
0
1 10 1000100
300
250
50
200
150
100
ADM8_R/S/T
RESET COMPARATOR OVERDRIVE, V
TH
– V
CC
(mV)
Figure 9. Maximum Transient Dura­tion Without Causing a RESET Pulse vs. RESET Comparator Overdrive
TEMPERATURE – C
0
–40 –20 020406080
20
40
60
80
100
120
140
160
180
85
VOD = VTH – V
CC
VOD = 20mV
VOD = 100mV
VOD = 200mV
VOD = 10mV
Figure 5. Power-Down RESET Delay vs. Temperature ADM8_T/S/R
2
1
1
RESET OUTPUT VOLTAGE
ADM809R
ADM809T
CH1
2.00V
2.00V M 200ms
CH1
2.00V
T
T
CH2
SUPPLY VOLTAGE 5V
PK TO PK
Figure 8. RESET Output Voltage vs. Supply Voltage
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ADM809/ADM810
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INTERFACING TO OTHER DEVICES
OUTPUT
The ADM809/ADM810 Series is designed to integrate with as many devices as possible and therefore has a standard output dependant on V
CC
. This enables the part to be used in both 3 V and 5 V or any nominal voltage within the minimum and maxi­mum specifications for V
CC
. Because of this design approach,
interfacing this device to other devices is simplified.
ENSURING A VALID RESET OUTPUT DOWN TO V
CC
= 0 V
When VCC falls below 0.8 V, ADM809’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 kΩ resistor should be connected
from RESET to ground.
V
CC
V
CC
GND
RESET
ADM809
Figure 10. Ensuring a Valid RESET Output Down to V
CC
= 0 V
THE BENEFITS OF A VERY ACCURATE RESET THRESHOLD
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 and ADM810 series can operate effectively even when there are large degradations of the supply voltages. Another advantage of the ADM809 and ADM810 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
In a number of cases it is necessary to interface many interrupts from different devices (i.e., thermal, attitude and velocity sen­sors). The ADM809 and ADM810 can easily be integrated into existing interrupt-handling circuits (Figure 11) or used as a stand-alone device.
PRIORITY ENCODER
74LS147
4 LINE BCD TO µP
V
CC
ADM809
GND
RESET
OTHER SENSING
DEVICES
V
CC
Figure 11. Interfacing to µPs with Multiple Interrupts
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ADM809/ADM810
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OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
C3047–12–4/97
PRINTED IN U.S.A.
Surface Mount Package
RT-3
0.1200 (3.048)
0.1102 (2.799)
PIN 1
0.0550 (1.397)
0.0470 (1.194)
0.0236 (0.599)
0.0177 (0.450)
0.1040 (2.642)
0.0827 (2.101)
0.0413 (1.049)
0.0374 (0.950)
0.0807 (2.050)
0.0701 (1.781)
1
2
3
SEATING
PLANE
0.0440 (1.118)
0.0320 (0.813)
0.0040 (0.102)
0.0005 (0.013)
0.0210 (0.533)
0.0146 (0.371)
0.027 (0.686) REF
0.0059 (0.150)
0.0034 (0.086)
0.0100 (0.254)
0.0050 (0.127)
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