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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1276 Datasheet

(TC1275 / TC1276 / TC1277) 3-Pin Reset Monitors for 3.3V Systems

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TC1276 pdf
TC1275/TC1276/TC1277
3-Pin Reset Monitors for 3.3V Systems
Features
• Precision VCC Monitor for 3.3V Systems
• 100msec 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
Device Selection Table
Part
Number
Order
Package
Temp.
Range
TC1275-xENB Complimentary 3-Pin SOT-23B -40°C to +85°C
TC1276-xENB Open Drain 3-Pin SOT-23B -40°C to +85°C
TC1277-xENB Complimentary 3-Pin SOT-23B -40°C to +85°C
NOTE: “x” denotes a suffix for VCC threshold (see table below).
Suffix
5
10
20
Package Type
Reset VCC Threshold (V)
3.06
2.88
2.55
3-Pin SOT-23B
General Description
The TC1275/TC1276/TC1277 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 20µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100msec after VCC
rises above the reset threshold. The TC1277 has an
active-high RESET output while the TC1275 and
TC1276 have an active-low RESET output. TC1275
and TC1277 each have a complimentary output while
the TC1276 has an open drain output. The output of the
TC1275 and TC1276 is valid down to VCC = 1.2V. The
TC1277 is valid down to VCC = 1.8V. All three devices
are available in a 3-Pin SOT-23B package.
The TC1275/TC1276/TC1277 devices are optimized to
reject fast transient glitches on the VCC line.
Typical Operating Circuit
VCC
2
VCC
1
RESET
VCC
Processor
RESET
Input
TC1275
GND
3
GND
RESET 1
*(RESET)
TC1275-xENB
TC1276-xENB 3 GND
TC1277-xENB
VCC 2
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236
*( ) is for TC1277
© 2002 Microchip Technology Inc.
DS21383B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1276 Datasheet

(TC1275 / TC1276 / TC1277) 3-Pin Reset Monitors for 3.3V Systems

No Preview Available !

TC1276 pdf
TC1275/TC1276/TC1277
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...............................................20mA
Output Current, RESET, RESET .........................20mA
Power Dissipation (TA 70°C)
3-Pin SOT-23B (derate 4mW/°C above +70°C)
................................................................. 230mW
Operating Temperature Range............. -40°C to +85°C
Storage Temperature Range .............. -65°C to +150°C
*Stresses above 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 above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC1275/TC1276/TC1277 ELECTRICAL SPECIFICATIONS
Recommended DC Operating Conditions: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min
Typ Max Units
Device
Test Conditions
VCC Supply Voltage
1.2 — 5.5 V TC1275, TC1276 Note 1
1.8 — 5.5
TC1277
DC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min Typ Max Units
Test Conditions
VOH Output Voltage @ 0-500µA
VCC – 0.5V VCC – 0.1V —
V TC1275, TC1277 Note 1
IOH Output Current @ 2.4 Volts
VCC = 5V
VCC = 2.7V
mA
— 13 —
TC1275
— 1.3 —
TC1277
Note 2
IOL Output Current @ 0.4 Volts
+10 30 — mA
Note 2, Note 5
ICC Operating Current
VCC < 5.5V
VCCTP < VCC < 5.5V
VCC < VCCTP
µA
— 20 35
TC1275, TC1277 Note 3
— 20 35
TC1276
Note 3
— 350 700
TC1276
Note 3
VCCTP-5 VCC Trip Point (TC1275/6/7-5)
2.98
3.06 3.15 V
Note 1
VCCTP-10 VCC Trip Point (TC1275/6/7-10)
2.80
2.88 2.97 V
Note 1
VCCTP-20 VCC Trip Point (TC1275/6/7-20)
2.47
2.55 2.64 V
Note 1
COUT Output Capacitance
— 9 — pF
RP Internal Pull-Up Resistor
3.0 6.0 9.0 kTC1276
AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Min Typ Max Units
Test Conditions
tRST RESET Active Time
100 200 300 msec
tRPD1 VCC Detect to RESET
— 20 50 µsec TC1275, TC1276 VCC(LOW) = 1V, Figure 3-2
tRPD2 VCC Detect to RESET
— 20 50 µsec TC1277
VCC(LOW) = 1V, Figure 3-4
tF VCC Slew Rate
300
(VCCTP(MAX) to VCCTP(MIN))
— — µsec
Figure 3-2, Figure 3-4
tR VCC Slew Rate
(VCCTP(MIN) to VCCTP(MAX))
0
— — nsec
Figure 3-1, Figure 3-3
tRPU1 VCC Detect to RESET
100 200 300 msec TC1275, TC1276 Note 4, Figure 3-1
tRPU2 VCC Detect to RESET
100 200 300 msec TC1277
Note 4, Figure 3-3
Note 1: All voltages referenced to ground.
2: Measured with VCC 2.7 volts.
3: Measured with RESET output open for TC1275/TC1276; measured with RESET output open for TC1277.
4: tR = 5µsec.
5: A 1kexternal resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using
the TC1276.
DS21383B-page 2
© 2002 Microchip Technology Inc.


Part Number TC1276
Description (TC1275 / TC1276 / TC1277) 3-Pin Reset Monitors for 3.3V Systems
Maker Microchip Technology
Total Page 13 Pages
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