ZSM330G [ZETEX]
SUPPLY VOLTAGE MONITOR; 电源电压监控器
| 型号： | ZSM330G |
| 厂家： | 
ZETEX SEMICONDUCTORS |
| 描述： | SUPPLY VOLTAGE MONITOR |
| 文件： | 总5页 (文件大小：142K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SUPPLY VOLTAGE
MONITOR
ZSM330
ISSUE 1 – NOVEMBER 1995
DEVICE DESCRIPTION
FEATURES
The ZSM330 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device hasbeen set to 3.1 volts
making it ideal for 3.3 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
ZSM330 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
3.1 volt threshold for 3.3 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
4-344
ZSM330
ABSOLUTE MAXIMUM RATING
Input Supply Voltage
-1 to 10V
10V
Power Dissipation
TO92
Offstate Output Voltage
780mW
Onstate Output
SOT223
SO8
2W(Note 2)
780mW(Note 2)
Sink Current(Note 1)
Internally limited
100mA
Clamp Diode
Forward Current(Note 1)
Operating Junction
Temperature
150°C
Operating Temperature
Storage Temperature
TEST CONDITIONS
-40 to 85°C
-55 to 150°C
(T
=25°C for typical values, T =-40 to 85°C for min/max values (Note3))
amb
amb
COMPARATOR
MIN
TYP.
MAX.
PARAMETER
SYMBOL
UNITS
V
Threshold Voltage
High state output (Vcc increasing)
VIH
3.01
3.09
3.15
Threshold Voltage
Low state output (Vcc decreasing)
VIL
VH
3.01
0.01
3.07
0.02
3.15
0.05
V
V
Hysteresis
OUPUT
Output sink saturation:
(Vcc=2.7V, Isink=8.0mA)
(Vcc=2.7V, 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=2.7V)
Isink
Ioh
Vf
10
27
mA
Offstate output leakage current
(Vcc , Output=3.3V)
0.02
1.2
2.2
0.5
1.5
µA
V
Clamp diode forward voltage
(If=10mA)
0.6
Propagation delay
Td
µs
(Vin 3.3V to 2.7V, Rl=10k, Tamb=25°C)
TOTAL DEVICE
Operating input voltage range
Vcc
Iq
1.0 to 6.5
V
Quiescent input current (Vcc=3.3V)
120
180
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
4-345
ZSM330
TYPICAL CHARACTERISTICS
500
5
R=10K
TA=25°C
400
300
200
100
4
3
85 °C
2
1
0
-40 °C 25 °C
0
0
2
4
6
8
10
4
5
0
1
2
3
Input Voltage (V)
Input Voltage (V)
Input Current vs. Input Voltage
Output Voltage vs. Input Voltage
50
40
30
Vin=2.7V
RL=10K
3.3
2.7
2
-40 °C
Ϸ
Ϸ
4
2
0
25 °C
85 °C
20
10
0
3
0
1
2
4
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
3.10
3.09
Vin=0V
Upper
Threshold
80
60
3.08
3.07
3.06
3.05
85 °C
25 °C
-40 °C
40
Lower
Threshold
20
0
0
0.4
0.8
1.2
1.6
2.0
-40
-20
0
20
40
60
80
100
Temperature ( °C)
Forward Voltage (V)
Clamp Diode Forward Current vs. Voltage
Threshold Voltage vs. Temperature
4-346
ZSM330
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
4-347
ZSM330
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
ZSM330N8
ZSM330G
Package
SO8
Part Mark
ZSM330
ZSM330
ZSM330
SOT223
TO92
ZSM330C
4-348
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