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TC1278-15ENBTR Arkusz danych(PDF) 1 Page - Microchip Technology

Numer części TC1278-15ENBTR
Szczegółowy opis  3-Pin Reset Monitors for 5V Systems
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Producent  MICROCHIP [Microchip Technology]
Strona internetowa  http://www.microchip.com
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© 2007 Microchip Technology Inc.
DS21384D-page 1
TC1278/TC1279
Features
• Precision VCC Monitor for 5.0V System Supplies
• 250 ms Minimum RESET Output Duration
• Output Valid to VCC = 1.2V
•VCC Transient Immunity
• Small 3-Pin SOT-23 Package
• No External Components
• Internal Pull-up Resistor
• Available in 3 different voltage detection levels:
- 4.625V (typ.), -5 suffix
- 4.375V (typ.), -10 suffix
- 4.125V (typ.), -15 suffix
Applications
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
Typical Operating Circuit
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
open-drain output uses an internal pull-up resistor of
approximately 6 k
Ω.
The reset output is driven active within 5 µs of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 250 ms after VCC
rises above the reset threshold. The TC1278 has an
active-high RESET output, while the TC1279 has an
active-low RESET output, with both devices having an
open-drain output stage. The output is valid down to
VCC = 1.2V. Both devices are available in a 3-Pin
SOT- 23 package.
Package Type
RESET
GND
+
VCC
VREF
Internal
Pull-up
6k
Ω
Resistor
TC1279
TC1278 has an active-high RESET output.
VCC
(TC1278) RESET
GND
TC1278
TC1279
1
2
3
3-Pin SOT-23
(TC1279) RESET
3-Pin Reset Monitors for 5V Systems
Obsolete Device


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