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PDF ICL7665 Data sheet ( Hoja de datos )
| Número de pieza | ICL7665 | |
| Descripción | Microprocessor Voltage Monitor with | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0001; Rev 2; 8/97
Microprocessor Voltage Monitor with
Dual Over/Undervoltage Detection
_______________General Description
The ICL7665 warns microprocessors (µPs) of overvolt-
age and undervoltage conditions. It draws a typical
operating current of only 3µA. The trip points and hys-
teresis of the two voltage detectors are individually pro-
grammed via external resistors to any voltage greater
than 1.3V. The ICL7665 will operate from any supply
voltage in the 1.6V to 16V range, while monitoring volt-
ages from 1.3V to several hundred volts. The Maxim
ICL7665A is an improved version with a 2%-accurate
VSET1 threshold and guaranteed performance over
temperature.
The 3µA quiescent current of the ICL7665 makes it
ideal for voltage monitoring in battery-powered sys-
tems. In both battery- and line-powered systems, the
unique combination of a reference, two comparators,
and hysteresis outputs reduces the size and compo-
nent count of many circuits.
________________________Applications
µP Voltage Monitoring
Low-Battery Detection
Power-Fail and Brownout Detection
Battery Backup Switching
Power-Supply Fault Monitoring
Over/Undervoltage Protection
High/Low Temperature, Pressure, Voltage Alarms
____________________________Features
o µP Over/Undervoltage Warning
o Improved Second Source
o Dual Comparator with Precision Internal Reference
o 3µA Operating Current
o 2% Threshold Accuracy (ICL7665A)
o 1.6V to 16V Supply Voltage Range
o On-Board Hysteresis Outputs
o Externally Programmable Trip Points
o Monolithic, Low-Power CMOS Design
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
ICL7665CPA
0°C to +70°C
8 Plastic DIP
ICL7665ACPA
0°C to +70°C
8 Plastic DIP
ICL7665BCPA
0°C to +70°C
8 Plastic DIP
ICL7665CSA
0°C to +70°C
8 SO
ICL7665ACSA
0°C to +70°C
8 SO
ICL7665BCSA
0°C to +70°C
8 SO
ICL7665CJA
0°C to +70°C
8 CERDIP
ICL7665ACJA
0°C to +70°C
8 CERDIP
ICL7665BCJA
0°C to +70°C
8 CERDIP
Ordering Information continued on last page.
_________________Pin Configurations
__________Typical Operating Circuit
VIN1 V+
OVERVOLTAGE
DETECTION
8
1 OUT1 V+
OUT2
VIN2
UNDERVOLTAGE
7 DETECTION
NMI
ICL7665
3 SET1
SET2 6
GND
4
SIMPLE THRESHOLD DETECTOR
TOP VIEW
OUT1 1
HYST1 2
SET1 3
GND 4
ICL7665
8 V+
7 OUT2
6 SET2
5 HYST2
OUT1
1
DIP/SO
V+ (CASE)
8
OUT2
7
HYST1 2
ICL7665
6 SET2
SET1 3
5
4
GND
TO-99
HYST2
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
1 page  
Microprocessor Voltage Monitor with
Dual Over/Undervoltage Detection
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
OUT1 SATURATION VOLTAGE AS A
FUNCTION OF OUTPUT CURRENT
2.0
V+ = 2V
1.5
V+ = 5V
V+ = 9V
1.0 V+ = 15V
0.5
0
0 5 10 15 20
IOUT OUT1 (mA)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
SUPPLY CURRENT AS A
FUNCTION OF SUPPLY VOLTAGE
0V ≤ VSET1, VSET2 ≤ V+
TA = -20°C
TA = +25°C
TA = +70°C
2 4 6 8 10 12 14 16
SUPPLY VOLTAGE (V)
SUPPLY CURRENT AS A
FUNCTION OF AMBIENT TEMPERATURE
5.0
4.5 0V ≤ VSET1, VSET2 ≤ V+
4.0 V+ = 15V
3.5 V+ = 9V
3.0
2.5
2.0
1.5
V+ = 2V
1.0
0.5
0
-20 0
20 40 60
AMBIENT TEMPERATURE (°C)
HYST1 OUTPUT SATURATION VOLTAGE
vs. HYST1 OUTPUT CURRENT
0
-0.4
V+ = 15V
-0.8
V+ = 9V
-1.2
V+ = 5V
-1.6
V+ = 2V
-2.0
-20
-16 -12 -8 -4
HYST1 OUTPUT CURRENT (mA)
0
HYST2 OUTPUT SATURATION VOLTAGE
vs. HYST2 OUTPUT CURRENT
0
-1
V+ = 15V
-2 V+ = 9V
V+ = 5V
-3
-4
V+ = 2V
-5
-5 -4 -3 -2 -1 0
HYST2 OUTPUT CURRENT (mA)
OUT2 SATURATION VOLTAGE AS A
FUNCTION OF OUTPUT CURRENT
2.0
1.5 V+ = 2V
V+ = 5V
V+ = 9V
1.0 V+ = 15V
0.5
0
0
5 10 15
IOUT OUT2 (mA)
20
_______________________________________________________________________________________ 5
5 Page 
Microprocessor Voltage Monitor with
Dual Over/Undervoltage Detection
LINE-POWERED
+5V INPUT
Q1
100k
1k
2N7000
2.4M
220Ω
5.6M
1M
1M
OUT1
HYST1
V+
HYST2
ICL7665
SET1 SET2
GND OUT2
VCC TO
CMOS
MEMORY
1µF
2N4393
22M 1.15M
1%
3V
LITHIUM
CELL
1M
1%
Figure 11. Battery Switchover Circuit
TEMPERATURE
SENSOR
(GENERAL
PURPOSE NPN
TRANSISTOR)
R3
470k
R1, 1M
HIGH-
TEMPERATURE
LIMIT
ADJUSTMENT
R4
22M
R5
27k
9V
V+
HYST2
HYST1
ICL7665
SET2 SET1
R6
22M
OUT2
OUT1
R7
1.5M
LOW-TEMPERATURE
LIMIT ADJUST
R2
1M ALARM
SIGNAL FOR
DRIVING LEDS,
BELLS, ETC.
Figure 12. Simple High/Low Temperature Alarm
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ICL7665.PDF ] | |
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