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PDF TC1271 Data sheet ( Hoja de datos )

Número de pieza TC1271
Descripción (TC1270) 4-Pin uP Reset Monitors
Fabricantes Microchip Technology 
Logotipo Microchip Technology Logotipo



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No Preview Available ! TC1271 Hoja de datos, Descripción, Manual

Obsolete Device
Recommended Replacements:
TC1270A, TC1270AN, TC1271A
TC1270/TC1271
4-Pin Reset Monitors
Features:
• Precision VCC Monitor for 1.8V, 2.7V, 3.0V, 3.3V
and 5.0V Nominal Supplies
• Manual Reset Input
• 140 ms Minimum RESET, Reset Output Duration
• RESET Output Valid to VCC = 1.0V (TC1270)
• Low 7 µA Supply Current
• VCC Transient Immunity
• Small 4-Pin SOT-143 Package
• No External Components
• Replacement for MAX811/812 and Offers a Lower
Threshold Voltage Option
Applications:
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
Typical Operating Circuit
VCC
VCC
Push
Button
MR RESET
TC1270
GND
VCC
Processor
Reset
Input
(Active Low)
GND
General Description
The TC1270 and TC1271 are cost-effective system
supervisor circuits designed to monitor VCC in digital
systems and provide a reset signal to the host
processor when necessary. A manual reset input is
provided to override the reset monitor, and is suitable
for use as a push button reset. No external components
are required.
The reset output is driven active within 20 µs (4 µs for
F version) of VCC falling through the reset voltage
threshold. Reset is maintained active for a minimum of
140 ms after VCC rises above the reset threshold. The
TC1271 has an active-high RESET output while the
TC1270 has an active-low RESET output. The output
of the TC1270 is valid down to VCC = 1V. Both devices
are available in a 4-Pin SOT-143 package.
The TC1270/TC1271 devices are optimized to reject
fast transient glitches on the VCC line. Low supply
current of 7 µA (VCC = 3.3V) makes these devices
suitable for battery powered applications.
Package Type
GND 1
TC1270 RESET
TC1271 (RESET)
2
TC1270
TC1271
4 VCC
3 MR
© 2007 Microchip Technology Inc.
DS21381D-page 1

1 page




TC1271 pdf
TC1270/TC1271
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
Pin No.
1
2
2
3
4
PIN FUNCTION TABLE
Symbol
GND
RESET
(TC1270)
RESET
(TC1271)
MR
VCC
Description
Ground
RESET output remains low while VCC is below the Reset voltage threshold,
and for at least 140 ms min. after VCC rises above Reset threshold
Reset output remains high while VCC is below the Reset voltage threshold,
and for at least 140 ms min. after VCC rises above Reset threshold
Manual Reset input generates a Reset when MR is below VIL
Supply voltage
3.1 Ground Terminal (GND)
GND provides the negative reference for the analog
input voltage. Typically, the circuit ground is used.
3.2 Reset Output (RESET) (TC1270)
RESET output remains low while VCC is below the
Reset voltage threshold (VTRIP). Once the device
voltage (VCC) returns to a high level (VTRIP + VHYS), the
device will remain in Reset for the Reset delay timer
(TRST). After that time expires, the RESET pin will be
driven to the high state.
3.3 Reset Output (RESET) (TC1271)
RESET output remains high while VCC is below the
Reset voltage threshold (VTRIP). Once the device
voltage (VCC) returns to a high level (VTRIP + VHYS), the
device will remain in Reset for the Reset delay timer
(TRST). After that time expires, the RESET pin will be
driven to the low state.
3.4 Manual Reset (MR)
The Manual Reset (MR) input pin allows a push button
switch to easily be connected to the system. When the
push button is depressed, it forces a system Reset.
This pin has circuitry that filters noise that may be pres-
ent on the MR signal.
The MR pin is active-low and has an internal pull-up
resistor.
3.5 Supply Voltage (VCC)
VCC can be used for power supply monitoring or a
voltage level that requires monitoring.
© 2007 Microchip Technology Inc.
DS21381D-page 5

5 Page





TC1271 arduino
TC1270/TC1271
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
X X XX
Threshold Temperature Package
Voltage
Range
Device
TC1270: 4-Pin RESET Monitor
TC1271: 4-Pin RESET Monitor
Examples:
a) TC1270LERCTR: 4.63V
b) TC1270MERCTR: 4.38V
c) TC1270TERCTR: 3.08V
d) TC1270SERCPBTR: 2.93V
e) TC1270SERCTR: 2.93V
f) TC1270RERCTR: 2.63V
g) TC1270FERCTR: 1.75V
Threshold voltage L = 4.63
(typical)
M = 4.38
T = 3.08
S = 2.93
R = 2.63
F = 1.75
Temperature Range E = -40°C to +85°C
a) TC1271LERCTR:
b) TC1271MERCTR:
c) TC1271TERCTR:
d) TC1271SERCTR:
e) TC1271RERCTR:
f) TC1271FERCTR:
4.63V
4.38V
3.08V
2.93V
2.63V
1.75V
Package
RCTR = Plastic small outline transistor (RC) SOT-143,
4 lead, (tape and reel).
© 2007 Microchip Technology Inc.
DS21381D-page 11

11 Page







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