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TC1278 bảng dữ liệu(PDF) 1 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21384B-page 1
TC1278/TC1279
Features
• Precision VCC Monitor for 5.0V System Supplies
• 250msec Minimum 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
NOTE: “x” denotes a suffix for VCC threshold (see table below).
Package Type
General Description
The TC1278/TC1279 are cost-effective system super-
visor 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 5
µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 250msec after VCC
rises above the reset threshold. The TC1278 has an
active-high RESET output while the TC1279 has an
active-low RESET output, and both devices have an
open drain output stage. The output is valid down to
VCC = 1.2V. Both devices are available in a 3-Pin SOT-
23B package.
Typical Operating Circuit
Part
Number
Order
Package
Temp.
Range
TC1278-xENB
Open Drain
3-Pin SOT-23B
-40°C to +85°C
TC1279-xENB
Open Drain
3-Pin SOT-23B
-40°C to +85°C
Suffix
Reset VCC Threshold (V)
5
4.625
10
4.375
15
4.125
VCC
RESET
GND
TC1278-xENB
TC1279-xENB
1
2
3
NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236
3-Pin SOT-23B
TC1279
VCC
VCC
VCC
RESET
RESET
Input
GND
GND
Processor
1
2
3
3-Pin Reset Monitors for 5V Systems


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