TC1270 datasheet(5/14 Pages) MICROCHIP

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DS21381D-page 5

TC1270/TC1271

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

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

present 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.

Pin No.

Symbol

Description

GND

Ground

RESET

(

TC1270)

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

(TC1271)

Reset output remains high while VCC is below the Reset voltage threshold,

and for at least 140 ms min. after VCC rises aboev Reset threshold

3MR

Manual Reset input generates a Reset when MR is below VIL

4VCC

Supply voltage

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