TC1270AMAVRCTR datasheet(15/42 Pages) MICROCHIP

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DS20002035F-page 15

TC1270A/70AN/71A

3.1

Ground Terminal (VSS)

VSS provides the negative reference for the analog

input voltage. Typically, the circuit ground is used.

3.2

Supply Voltage (VDD)

VDD 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:

Push-Pull active-low Reset

Push-Pull active-high Reset

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 VDD is

below the Reset voltage threshold (VTRIP). The time

that the RST pin is held low after the device voltage

(VDD) returns to a high level (> VTRIP) 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 VDD is

below the Reset voltage threshold (VTRIP). The time

that the RST pin is held high after the device voltage

(VDD) returns to a high level (> VTRIP) 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 VDD is

below the Reset voltage threshold (VTRIP). The time

that the RST pin is held low after the device voltage

(VDD) returns to a high level (> VTRIP) depends on the

Reset time-out 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.

333

IST(1)

Manual Reset Input Pin

This input allows a push button switch to be

directly connected to a TC1270A/70AN/71A

device’s MR pin, which can be used to force a

system Reset. The input filter ignores noise

pulses that occur on the MR pin.

H = Switch is open (internal pull-up resistor

pulls signal high). State of the RST/RST

pin is determined by other system condi-

tions.

L = Switch is depressed (shorted to ground).

This forces the RST/RST pin Active.

424

VDD

—

Power Supply Voltage

—1

—

No Connection

TABLE 3-1:

PINOUT DESCRIPTION (CONTINUED)

Pin Number

Sym.

Standard Function

TC1270A

(Push-Pull,

active-low)

TC1270AN

(Open-Drain,

active-low)

TC1271A

(Push-Pull,

active-high)

Type

Buffer /

Driver

Note 1: The MR pin has an internal weak pull-up (18.5 k

 typical).

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