TC1273 Datasheet PDF - Microchip Technology
| Part Number | TC1273 | |
| Description | (TC1272 / TC1273 / TC1274) 3-Pin Reset Monitors for 5V Systems | |
| Manufacturers | Microchip Technology | |
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M TC1272/TC1273/TC1274
3-Pin Reset Monitors for 5V Systems
Features
• Precision VCC Monitor for 5.0V Systems
• 100 msec 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
Package Type
3-Pin SOT-23B*
RESET 1
**(RESET)
VCC 2
TC1272
TC1273
TC1274
3 GND
* 3-Pin SOT-23B is equivalent to JEDEC TO-236
**( ) is for TC1274
General Description
The TC1272/TC1273/TC1274 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 20 µsec of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 msec after
VCC rises above the reset threshold. The TC1274 has
an active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET output. The
TC1272 and TC1274 each have a complimentary out-
put, while the TC1273 has an open-drain output. The
output of the TC1272 and TC1273 is valid down to VCC
= 1.2V. The TC1274 is valid down to VCC = 1.8V. All
three devices are available in a 3-Pin SOT-23B
package.
The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the VCC line.
Typical Operating Circuit
VCC
2
VCC
VCC
1
RESET
TC1272
GND
3
RESET
Input
Processor
GND
2003 Microchip Technology Inc.
DS21382B-page 1
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TC1272/TC1273/TC1274
4.0 APPLICATIONS INFORMATION
4.1 Operation – Power Monitor
The TC1272/TC1273/TC1274 is designed to function
as a voltage monitor for +5V systems. These devices
provide a RESET signal to indicate that the VCC has
dropped below a preset voltage level that is selected by
the suffix part number. In addition, the RESET is held
active for approximately 200 ms after the power supply
has risen above the voltage threshold level to allow
time for the power supply to stabilize before system
operation commences.
VCCTP(MIN)
tR
VCVCCTCPTP(MAX)
VCC
RESET
tRPU1
VOH
FIGURE 4-1:
Timing Diagram – Power Up
(TC1272/TC1273).
VCC
VCCTP(MAX)
VCCTP
tF
VCCTP(MIN)
VCC
tR
VCCTP(MIN)
VCCTP(MAX)
VCCTP
tRPU2
RESET
FIGURE 4-3:
(TC1274).
VOL
Timing Diagram – Power Up
VCC
VCCTP(MAX)VCCTP
tF
VCCTP(MIN)
tRPD2
RESET
VOH
RESET Slews With VCC
FIGURE 4-4:
Timing Diagram –
Power Down (TC1274).
RESET
tRPD1
VOL
FIGURE 4-2:
Timing Diagram – Power
Down (TC1272/TC1273).
2003 Microchip Technology Inc.
DS21382B-page 5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for TC1273 electronic component. |
| Information | Total 12 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ TC1273.PDF Datasheet ] | |
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