TC1270_07 Datasheet, PDF (5/14 Pages) Microchip Technology – 4-Pin Reset Monitors

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
V_CC
Description
Ground
RESET output remains low while V_CC is below the Reset voltage threshold,
and for at least 140 ms min. after V_CC rises above Reset threshold
Reset output remains high while V_CC is below the Reset voltage threshold,
and for at least 140 ms min. after V_CC rises aboev Reset threshold
Manual Reset input generates a Reset when MR is below V_IL
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 V_CC is below the
Reset voltage threshold (V_TRIP). Once the device
voltage (V_CC) returns to a high level (V_TRIP + V_HYS), the
device will remain in Reset for the Reset delay timer
(T_RST). 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 V_CC is below the
Reset voltage threshold (V_TRIP). Once the device
voltage (V_CC) returns to a high level (V_TRIP + V_HYS), the
device will remain in Reset for the Reset delay timer
(T_RST). 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
present on the MR signal.
The MR pin is active-low and has an internal pull-up
resistor.
3.5 Supply Voltage (V_CC)
V_CC can be used for power supply monitoring or a
voltage level that requires monitoring.
© 2007 Microchip Technology Inc.
DS21381D-page 5