TC1270A Datasheet, PDF (16/40 Pages) Microchip Technology – Voltage Supervisor with Manual Reset Input

TC1270A/70AN/71A
3.1 Ground Terminal (V_SS)
V_SS provides the negative reference for the analog
input voltage. Typically, the circuit ground is used.
3.2 Supply Voltage (V_DD)
V_DD can be used for power supply monitoring or a
voltage level that requires monitoring.
3.3 Reset Output (RST and RST)
There are three types of Reset output pins. These are:
1. Push-Pull active-low Reset
2. Push-Pull active-high Reset
3. Open-Drain active-low Reset, External pull-up
resistor required.
3.3.1 ACTIVE-LOW (RST) - PUSH-PULL
The RST push-pull output remains low while V_DD is
below the reset voltage threshold (V_TRIP). The time that
the RST pin is held low after the device voltage (V_DD)
returns to a high level (> V_TRIP) is typically 280 ms.
After the Reset delay timer expires, the RST pin will be
driven to the high state.
3.3.2 ACTIVE-HIGH (RST) - PUSH-PULL
The RST push-pull output remains high while V_DD is
below the reset voltage threshold (V_TRIP). The time that
the RST pin is held high after the device voltage (V_DD)
returns to a high level (> V_TRIP) is typically 280 ms.
After the Reset delay timer expires, the RST pin will be
driven to the low state.
3.3.3 ACTIVE-LOW (RST) - OPEN-DRAIN
The RST open-drain output remains low while V_DD is
below the reset voltage threshold (V_TRIP). The time that
the RST pin is held low after the device voltage (V_DD)
returns to a high level (> V_TRIP) depends on the Reset
Timeout selected. After the Reset Delay Timer expires,
the RST pin will float.
3.4 Manual Reset Input (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.
DS22035B-page 16
© 2007 Microchip Technology Inc.