TPS3421 datasheet(10/19 Pages) TI

10 / 19 page

VCC

PB1

RST

GND

Load

Switch

Device

TST

VIN = 1.6 V to 6.5 V

OUT

System

Power

Push-Button

Switch

VCC

PB1

RST

GND

Load

Switch

Device

PB2

VIN = 1.6 V to 6.5 V

OUT

System

Power

Push-Button

Switch

TPS3420

TPS3421

TPS3422

SBVS211A – AUGUST 2012 – REVISED MARCH 2013

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TPS3421 Inputs (PB1, PB2)

The TPS3421 has two inputs: PB1 and PB2. External pull-up resistors to VCC are required to pull the input pins

high, as shown in Figure 15. When input conditions are met (that is, when both inputs are held low

simultaneously for the push-button timer period, ttimer), the device asserts a single reset pulse of a fixed time (trst);

see Figure 2. Reset deassertion is independent of the inputs because trst is a fixed time pulse. A reset pulse

occurs only one time after each valid input condition. At least one input pin must be released (go high) and then

driven low for the ttimer duration before RST asserts again; see Figure 17.

NOTE: Connect TS to VCC or ground for different PB time delays. Connect one PB input to ground for use as a single channel.

Figure 15. TPS3421 Application Diagram

TPS3422 Input (PB1)

The TPS3422 has only one input: PB1. This input has an internal pull-up resistor to VCC. When input conditions

are met (that is, when the input is held low for the push-button timer period, ttimer), the device asserts a single

reset pulse of a fixed time (trst); see Figure 3. Reset deassertion is independent of the input because trst is a fixed

time pulse. A reset pulse occurs only one time after each valid input condition. The input pin must be released

(go high) and then driven low for the ttimer period before RST asserts again. An application diagram is shown in

Figure 16.

NOTE: Connect TS to VCC or ground for different PB time delays.

Figure 16. TPS3422 Application Diagram

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