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

Numéro de référence TC1276
Description (TC1275 / TC1276 / TC1277) 3-Pin Reset Monitors for 3.3V Systems
Fabricant Microchip Technology 
Logo Microchip Technology 





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TC1276 fiche technique
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

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