Zetex ZXCM209JF, ZXCM209LF, ZXCM209MF, ZXCM209RF, ZXCM209SF Datasheet
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ZXCM209
ZXCM210
VERY LOW POWER MICROPROCESSOR RESET DEVICES
DESCRIPTION
The ZXCM209/210 are three terminal supervisory circuits used to monitor the power supplies in microprocessor and digital systems. They provide a high performance economical solution when used with 5V, 3V or lower powered circuits. Reset thresholds suitable for operation with a variety of supply voltages are available.
These devices provide a reset signal whenever the supply voltage falls below a preset threshold, keeping it asserted for a minimum delay period of 140ms after the supply has risen above the reset level. The ZXCM209 has an active-low RESET output (which is guaranteed to be in the correct state for supplies down to 1V), while the ZXCM210 has an active-high RESET output.
The reset comparator has in built hysteresis to prevent erratic operation and is designed to ignore supply transients. Low supply current (typically 2µA) makes the ZXCM209/210 devices ideal for use in portable equipment. They are available in a 3-pin SOT23 surface mount package with an industry standard pinout.
FEATURES
•Enhanced alternative to MAX809/810 and similar parts
•Precision monitoring of 5V, 3.3V, 3V power supply voltages
•1% threshold tolerance
•2µA typical supply current
•140ms minimum power on reset pulse width
•Alternative minimum pulse widths available, contact your local sales office for availability
•RESET LOW Output (ZXCM209)
•RESET HIGH Output (ZXCM210)
•Power supply transient immunity
•No latch up
•No external components
•3-Pin SOT23 package
APPLICATIONS
•Computer systems
•Controllers
•Instrumentation
•Microprocessor power monitoring
•Microcontroller power monitoring
•Power supplies
•Portable/Battery-powered equipment
•Automotive
APPLICATION CIRCUIT
vcc
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vcc |
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vcc |
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ZXCM |
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Micro |
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Reset |
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Reset |
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Output |
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Input |
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Gnd |
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Gnd |
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ISSUE 3 - FEBRUARY 2001
1
ZXCM209
ZXCM210
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage with respect to GND
VCC |
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-0.3V to 7.0V |
RESET, RESET |
-0.3V to (VCC + 0.3V) |
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Input Current, VCC |
20mA |
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Output Current |
20mA |
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Rate of Rise, VCC |
250V/µs |
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Continuous Power Dissipation |
500mW |
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Operating Temperature Range |
-55°C to +125°C |
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Storage Temperature Range |
-65°C to +150°C |
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Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (unless otherwise stated) VCC = full range, TA = -55°C to +125°C
SYMBOL |
PARAMETER |
CONDITIONS |
LIMITS |
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UNITS |
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MIN |
TYP |
MAX |
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VR |
VCC Range |
TA=0° to 70°C |
1.0 |
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5.5 |
V |
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TA=-55° to 125°C |
1.2 |
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5.5 |
V |
ICC |
Supply Current |
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2 |
5 |
A |
VTH |
Reset Threshold |
Suffix L; TA=25°C |
4.58 |
4.63 |
4.68 |
V |
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Suffix M; TA=25°C |
4.34 |
4.38 |
4.42 |
V |
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Suffix J; TA=25°C |
3.96 |
4.00 |
4.04 |
V |
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Suffix T; TA=25°C |
3.05 |
3.08 |
3.11 |
V |
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Suffix S; TA=25°C |
2.90 |
2.93 |
2.96 |
V |
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Suffix R; TA=25°C |
2.60 |
2.63 |
2.66 |
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VTHT |
Reset Threshold |
TA=25°C |
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1 |
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% |
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Tolerance |
TA=-55° to 125°C |
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5 |
% |
∆ VTH/°C |
Reset Threshold Temp. |
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50 |
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ppm/°C |
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Coefficient |
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VD |
VCC to Reset Delay |
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30 |
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VTO |
Reset Active Timeout |
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140 |
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560 |
ms |
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Period |
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ISSUE 3 - FEBUARY 2001
2
ZXCM209
ZXCM210
ELECTRICAL CHARACTERISTICS ZXCM209
TEST CONDITIONS (unless otherwise stated) VCC = full range, TA = -55°C to +125°C
SYMBOL |
PARAMETER |
CONDITIONS |
LIMITS |
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UNITS |
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MIN |
TYP |
MAX |
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VOL |
Reset Output Voltage |
VCC>1V, IOL=100µA (0 to 85°C) |
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0.3 |
V |
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Low |
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VCC>1.2V, IOL=200µA |
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0.3 |
V |
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VTH>VCC>2.5V, IOL=2.7mA |
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0.4 |
V |
VOH |
Reset Output Voltage |
VCC>VTHmax, IOH=1mA |
0.8Vcc |
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V |
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High |
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ELECTRICAL CHARACTERISTICS ZXCM210
TEST CONDITIONS (unless otherwise stated) VCC = full range, TA = -55°C to +125°C
SYMBOL |
PARAMETER |
CONDITIONS |
LIMITS |
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UNITS |
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MIN |
TYP |
MAX |
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VOL |
Reset Output Voltage |
VCC>VTHmax, IOL=2mA |
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0.3 |
V |
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Low |
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VCC>VTHmax, IOL=2.7mA |
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0.4 |
V |
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VOH |
Reset Output Voltage |
VCC>1.5V, IOH=150µA |
0.8Vcc |
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V |
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High |
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VCC>VTH>2.5V, IOH=1mA |
0.8Vcc |
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V |
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Note: Device testing is performed at TA=25°C. Device thermal performance is guaranteed by design
TYPICAL CHARACTERISTICS
ISSUE 3 - FEBRUARY 2001 |
3
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