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SUPPLY VOLTAGE MONITOR
ISSUE 3 - JANUARY 1998 DEVICE DESCRIPTION
The ZSM561 is a three terminal under vo l ta ge mo ni t or ci rc ui t f or use i n microprocessor systems. The threshold voltage of the device has been set to 4.6 volts making it ideal for 5 volt circuits. Included in the device is a precise voltage reference and a comparator with built in hysteresis to prevent erratic operation. The ZSM561 features an open collector output capable of sinking at least l0mA which only requires a single external resistor to interface to following circuits. 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. Should the supply voltage, once established, at any time drop below the threshold level then the output again will pull low. Also included is a 6 volt zener diode connected between Vcc and Gnd. With just the addition of a low cost external NPN transistor and resistor, this zener allows the ZSM561 to provide both regulator and supply monitor functions The device is available in a TO92 package for through hole applications as well as SO8 and SOT223 for surface mount requirements.
ZSM561
FEATURES
* * * * * * * * * * * * * * *
SO8, SOT223 and TO92 packages Power on reset generator Automatic reset generation Low standby current Guaranteed operation from 1 volt Wide supply voltage range Internal clamp diode to discharge delay capacitor 4.6 volt threshold for 5 volt logic 20mV hysteresis prevents erratic operation
APPLICATIONS
Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment
SCHEMATIC DIAGRAM
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ZSM561
ABSOLUTE MAXIMUM RATING
Input Supply Voltage Supply Zener Current Offstate Output Voltage Onstate Output Sink Current(Note 1) Clamp Diode Forward Current(Note 1) -1 to 7V 25mA continuous 7V Internally limited 100mA Operating Junction Temperature Operating Temperature Storage Temperature Power Dissipation TO92 SOT223 SO8 150C -40 to 85C -65 to 150C 780mW 2W(Note 2) 780mW(Note 2)
TEST CONDITIONS (Tamb=25C for typical values, Tamb=-40 to 85C for min/max values (Note3)) COMPARATOR
PARAMETER Threshold Voltage High state output (Vcc increasing) Threshold Voltage Low state output (Vcc decreasing) Hysteresis SYMBOL VIH VIL VH 4.5 4.5 0.01
MIN TYP. MAX.
UNITS V V V
4.61 4.59 0.02
4.7 4.7 0.05
OUPUT
Output sink saturation: (Vcc=4.0V, Isink=8.0mA) (Vcc=4.0V, Isink=2.0mA) (Vcc=1.0V, Isink=0.1mA) Onstate output sink current (Vcc , Output=4V) Offstate output leakage current (Vcc , Output=5V) Clamp diode forward voltage (If=10mA) Propagation delay (Vin 5V to 4V, Rl=10k, Tamb=25C) Isink Ioh Vf Td 0.6 10 20 0.02 1.2 1.5 VOL 0.46 0.15 1.0 0.4 0.25 60 0.5 1.5 V V V mA A V s
SUPPLY ZENER
Avalanche Voltage:(Icc=1mA) Slope Resistance: Vz 5.8 6 45 21 6.2 60 30 V (Icc=15mA) Rz (Icc=15mA to 50mA)
TOTAL DEVICE
Operating input voltage range(Note 5) Quiescent current (Vcc=5V) Vcc Iq 1.0 to 7 135 200 V A
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ZSM561
TYPICAL CHARACTERISTICS
500 10 RL=10K TA=25 C
400
8
Input Current (A)
Output Voltage (V)
-40 C 25 C 85 C 0 0 2 4 6 8 10
300
6
200
4
100
2
0 0 2 4 6 8 10
Input Voltage (V)
Input Voltage (V)
Input Current vs. Input Voltage
30 Vin=4V
Output Voltage vs. Input Voltage
RL=10K
Vin (V) Vout (V)
-40 C
5 4
25 C
Sink Current (mA)
20 85 C 4
10
2
0 0 0 0.4 0.8 1.2 1.6 2.0 -1 0 1 2 3 4
Output Saturation Voltage (V)
Time (s)
Output Saturation Voltage vs. Sink Current
80 Vin=0V
Reset Delay Time
60
Forward Current (mA)
40
85 C 25 C
20
-40 C
0 0 0.4 0.8 1.2 1.6 2.0
Forward Voltage (V)
Clamp Diode Forward Current vs. Voltage
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ZSM561
TYPICAL CHARACTERISTICS
4.70 50
40
4.65
Threshold Voltage (V)
Input Current (mA)
Upper Threshold 4.60
30
20
Lower Threshold 4.55
10
4.50 0 0 2 4 6 8 10 -40 -20 0 20 40 60 80 100
Temperature ( C)
Input Voltage (V)
Input Current vs. Input Voltage
Threshold Voltage vs. Temperature
TIMING DIAGRAM
Vcc
Threshold Voltage 1V
Output
AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAA AAAAAAA AAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAA AAAAAAA AAAA
Output Undefined
Output Undefined
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. A time delayed reset can be accomplished with the additional Cd. 5. Operation above Vz may be restricted by the supply current rating Iz
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ZSM561
APPLICATION CIRCUITS
1 TDY = RCd ln 1 - VTH(mpu) Vin
TDY = Time (Seconds) VTH = Microprocessor ResetThreshold Vin = Power Supply Voltage
RB =
(VINMIN - 6) IL (IQ + ) hFE hFE = The minimum hFE that can be expected from the pass transistor under worst case conditions. (ie Lowest temperature and minimum input voltage). For the ZTX690B a value of 250 could be used.
VINMIN = The minimum input voltage provided by the unregulated supply. IQ = The ZSM561 quiescent current (ie 200 A) IL = Load current taken by the microprocessor system.
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ZSM561
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 ZSM561N8 ZSM561G ZSM561C Package SO8 SOT223 TO92 Part Mark ZSM561 ZSM561 ZSM561
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