ZSM300G [ZETEX]
SUPPLY VOLTAGE MONITOR; 电源电压监控器![ZSM300G](http://pdffile.icpdf.com/pdf1/p00025/img/icpdf/ZSM300_131484_icpdf.jpg)
型号: | ZSM300G |
厂家: | ![]() |
描述: | SUPPLY VOLTAGE MONITOR |
文件: | 总5页 (文件大小:153K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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SUPPLY VOLTAGE
MONITOR
ZSM300
ISSUE 1 – NOVEMBER 1995
DEVICE DESCRIPTION
FEATURES
The ZSM300 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device has been set to 2.63
volts making it ideal for 3 volt circuits.
SO8, SOT223 and TO92 packages
Power on reset generator
Automatic reset generation
Low standby current
•
•
•
•
•
•
•
Guaranteed operation from 1 volt
Wide supply voltage range
Included in the device is a precise voltage
reference and a comparator with built in
hysteresis to prevent erratic operation. The
ZSM300 features an open collector output
capable of sinking at least l0mA which only
requires a single external resistor to
interface to following circuits.
Internal clamp diode to discharge
delay capacitor
2.63 volt threshold for 3 volt logic
•
•
20mV hysteresis prevents erratic operation
APPLICATIONS
Operation of the device is guaranteed from
one volt upwards, from this level to the
device threshold voltage the output is held
low providing a power on reset function.
Shouldthesupplyvoltage, onceestablished,
at any time drop below the threshold level
then the output again will pull low.
Microprocessor systems
•
Computers
•
Computer peripherals
•
Instrumentation
•
Automotive
•
Battery powered equipment
•
The device is available in a TO92 package for
through hole applicationsaswell asSO8 and
SOT223 for surface mount requirements.
SCHEMATIC DIAGRAM
4-339
ZSM300
Power Dissipation
TO92
SOT223
ABSOLUTE MAXIMUM RATING
780mW
2W(Note 2)
780mW(Note 2)
Input Supply Voltage
Offstate Output Voltage
-1 to 10V
10V
SO8
Onstate Output
Sink Current(Note 1)
Internally limited
100mA
Clamp Diode
Forward Current(Note 1)
Operating Junction
Temperature
150°C
Operating Temperature
Storage Temperature
-40 to 85°C
-55 to 150°C
TEST CONDITIONS
amb
COMPARATOR
(T
=25°C for typical values, T
=-40 to 85°C for min/max values (Note3))
amb
MIN
TYP.
MAX.
PARAMETER
SYMBOL
UNITS
V
Threshold Voltage
High state output (Vcc increasing)
VIH
2.56
2.64
2.7
Threshold Voltage
Low state output (Vcc decreasing)
VIL
VH
2.56
0.01
2.62
0.02
2.7
V
V
Hysteresis
0.05
OUPUT
Output sink saturation:
(Vcc=2.2V, Isink=8.0mA)
(Vcc=2.2V, Isink=2.0mA)
(Vcc=1.0V, Isink=0.1mA)
VOL
0.46
0.15
1.0
0.4
0.25
60
V
V
V
Onstate output sink current
(Vcc , Output=2.2V)
Isink
Ioh
Vf
10
27
mA
Offstate output leakage current
(Vcc , Output=3V)
0.02
1.2
2.5
0.5
1.5
µA
V
Clamp diode forward voltage
(If=10mA)
0.6
Propagation delay
Td
µs
(Vin 3V to 2.2V, Rl=10k, Tamb=25°C)
TOTAL DEVICE
Operating input voltage range
Vcc
Iq
1.0 to 6.5
V
Quiescent input current (Vcc=3V)
125
190
µA
Note:
1. Maximum package power dissipation must be observed.
2. Maximum power dissipation, for the SOT223 and SO8 packages, is calculated assuming
that the device is mounted on a PCB measuring 2 inches square.
3. Low duty cycle pulse techniques are used during test to maintain junction temperatures as
close to ambient as possible.
4-340
ZSM300
TYPICAL CHARACTERISTICS
500
400
300
200
100
0
5
R =10K
TA =25 °C
4
85 °C
3
2
25 °C
-40 °C
1
0
0
2
4
6
8
10
4
5
0
1
2
3
(V)
Input Voltage
(V)
Input Voltage
Input Current vs. Input Voltage
Output Voltage vs. Input Voltage
50
40
Vin=2.4V
RL =10K
3.0
2.4
2
30
20
Ϸ
-40 °C
Ϸ
4
2
0
25 °C
85 °C
10
0
3
1
4
0
2
0
0.4
0.8
1.2
1.6
2.0
Time (µs)
Output Saturation Voltage (V)
Reset Delay Time
Output Saturation Voltage vs. Sink Current
100
2.65
2.64
2.63
Vin=0V
Upper Threshold
80
60
85 °C
25 °C
-40 °C
40
2.62
2.61
Lower Threshold
20
0
2.60
-40
0
0.4
0.8
1.2
1.6
2.0
20
-20
0
40
60
80
100
Temperature (°C)
Forward Voltage (V)
Clamp Diode Forward Current vs. Voltage
Threshold Voltage vs. Temperature
4-341
ZSM300
TIMING DIAGRAM
Vcc
Threshold
Voltage
1 V
Output
Output
Output
Undefined
Undefined
APPLICATION CIRCUIT
Note 4: A time delayed reset can be accomplished with the additional Cd.
1
TDY =Time (Seconds)
VTH =Microprocessor Reset Threshold
Vin =Power Supply Voltage
TDY = RCd ln
VTH(mpu)
1 −
Vin
4-342
ZSM300
CONNECTION DIAGRAMS
SO8 Package Suffix – N8
SOT223 Package Suffix – G
Top View
Top View –
Pin 4 floating or connected to pin 2
TO92 Package Suffix – C
Bottom View
ORDERING INFORMATION
Part Number
ZSM300N8
ZSM300G
Package
SO8
Part Mark
ZSM300
ZSM300
ZSM300
SOT223
TO92
ZSM300C
4-343
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