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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1272 Datasheet

(TC1272 / TC1273 / TC1274) 3-Pin Reset Monitors for 5V Systems

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TC1272 pdf
M TC1272/TC1273/TC1274
3-Pin Reset Monitors for 5V Systems
Features
• Precision VCC Monitor for 5.0V Systems
• 100 msec Minimum RESET, RESET Output
Duration
• Output Valid to VCC = 1.2V
• VCC Transient Immunity
• Small 3-Pin SOT-23B Package
• No External Components
Applications
• Computers
• Embedded Systems
• Battery-Powered Equipment
• Critical µP Power Supply Monitoring
Package Type
3-Pin SOT-23B*
RESET 1
**(RESET)
VCC 2
TC1272
TC1273
TC1274
3 GND
* 3-Pin SOT-23B is equivalent to JEDEC TO-236
**( ) is for TC1274
General Description
The TC1272/TC1273/TC1274 are cost-effective
system supervisor circuits designed to monitor VCC in
digital systems and provide a reset signal to the host
processor when necessary. No external components
are required.
The reset output is driven active within 20 µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 msec after
VCC rises above the reset threshold. The TC1274 has
an active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET output. The
TC1272 and TC1274 each have a complimentary out-
put, while the TC1273 has an open-drain output. The
output of the TC1272 and TC1273 is valid down to VCC
= 1.2V. The TC1274 is valid down to VCC = 1.8V. All
three devices are available in a 3-Pin SOT-23B
package.
The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the VCC line.
Typical Operating Circuit
VCC
2
VCC
VCC
1
RESET
TC1272
GND
3
RESET
Input
Processor
GND
2003 Microchip Technology Inc.
DS21382B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1272 Datasheet

(TC1272 / TC1273 / TC1274) 3-Pin Reset Monitors for 5V Systems

No Preview Available !

TC1272 pdf
TC1272/TC1273/TC1274
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Supply Voltage (VCC to GND) .............................+6.0V
RESET, RESET.......................... -0.3V to (VCC + 0.3V)
Input Current, VCC..............................................20 mA
Output Current, RESET, RESET ........................20 mA
Power Dissipation (TA 70°C)
3-Pin SOT-23B (derate 4 mW/°C above +70°C)
................................................................230 mW
Operating Temperature Range............. -40°C to +85°C
Storage Temperature Range .............. -65°C to +150°C
† Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C.
Parameters
Sym
Min
Typ Max Units
Conditions
Supply Voltage
TC1272, TC1273
TC1274
Output Voltage @ 0-500 µA
Output Current @ 2.4 Volts
VCC
VCC
VOH
1.2 —
1.8 —
VCC – 0.5V VCC – 0.1V
5.5
5.5
V Note 1
V
V TC1272, TC1274 (Note 1)
VCC = 5V TC1272
VCC = 4V TC1274
Output Current @ 0.4 Volts
Operating Current
IOH
IOH
IOL
+10
10 — mA Note 2
8 — mA
30 — mA Note 2, Note 5
VCC < 5.5V: TC1272, TC1274 ICC
17 40 µA Note 3
VCCTP < VCC < 5.5V: TC1273
ICC
17 40 µA Note 3
VCC < VCCTP: TC1273
ICC
700
1200
µA Note 3
VCC Trip Point (TC1272/3/4-5) VCCTP-5
4.50
4.62 4.75 V Note 1
VCC Trip Point (TC1272/3/4-10) VCCTP-10
4.25
4.37 4.49 V Note 1
VCC Trip Point (TC1272/3/4-15) VCCTP-15
4.00
4.12 4.24 V Note 1
Output Capacitance
COUT
9 — pF
Internal Pull-Up Resistor
RP 3
6 9 k
AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
RESET Active Time
tRST
100
200 300 msec
VCC Detect to RESET
TC1272, TC1273
tRPD1
20 50 µsec VCC(LOW) = 1V, Figure 4-2
VCC Detect to RESET - TC1274
VCC Slew Rate
(VCCTP(MAX) to VCCTP(MIN))
VCC Slew Rate
(VCCTP(MIN) to VCCTP(MAX))
VCC Detect to RESET
TC1272, TC1273
tRPD2
tF
tR
tRPU1
300
0
100
20 50 µsec VCC(LOW) = 1V, Figure 4-4
— — µsec Figure 4-2, Figure 4-4
— — nsec Figure 4-1, Figure 4-3
200 300 msec Note 4, Figure 4-1
VCC Detect to RESET - TC1274
tRPU2
100
200 300 msec Note 4, Figure 4-3
Note 1: All voltages referenced to ground.
2: Measured with VCC 2.7 volts.
3: Measured with RESET output open for TC1272/TC1273; measured with RESET output open for TC1274.
4: tR = 5 µsec.
5: A 1 kexternal resistor may be required in some applications for proper operation of the microprocessor reset control
circuit when using the TC1273.
DS21382B-page 2
2003 Microchip Technology Inc.


Part Number TC1272
Description (TC1272 / TC1273 / TC1274) 3-Pin Reset Monitors for 5V Systems
Maker Microchip Technology
Total Page 12 Pages
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