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TC1278 Datasheet

  • TC1278

  • 3-Pin Reset Monitors for 5V Systems

  • 403.64KB

  • 12页

  • MICROCHIP   MICROCHIP

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TC1278/TC1279
3-Pin Reset Monitors for 5V Systems
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Precision V
CC
Monitor for 5.0V System Supplies
250msec Minimum RESET Output Duration
Output Valid to V
CC
= 1.2V
V
CC
Transient Immunity
Small 3-Pin SOT-23B Package
No External Components
General Description
The TC1278/TC1279 are cost-effective system super-
visor circuits designed to monitor V
CC
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碌sec of V
CC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 250msec after V
CC
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
V
CC
= 1.2V. Both devices are available in a 3-Pin SOT-
23B package.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Computers
Embedded Systems
Battery Powered Equipment
Critical
碌P
Power Supply Monitoring
Device Selection Table
Part
Number
Order
Package
Temp.
Range
Typical Operating Circuit
V
CC
2
V
CC
1
RESET
V
CC
Processor
RESET
Input
TC1278-xENB Open Drain 3-Pin SOT-23B -40掳C to +85掳C
TC1279-xENB Open Drain 3-Pin SOT-23B -40掳C to +85掳C
NOTE:
鈥渪鈥?denotes a suffix for V
CC
threshold (see table below).
TC1279
GND
3
GND
Suffix
5
10
15
Reset V
CC
Threshold (V)
4.625
4.375
4.125
Package Type
3-Pin SOT-23B
RESET
1
TC1278-xENB
TC1279-xENB
V
CC
3
GND
2
NOTE:
3-Pin SOT-23B is equivalent to JEDEC TO-236
2002 Microchip Technology Inc.
DS21384B-page 1
漏

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