WDI

RESET

TPS3824

WDI External

TPS382x-xx

TPS382xA-xx

SLVS165J – APRIL 1998 – REVISED APRIL 2013

www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

DESCRIPTION (CONTINUED)

The TPS3820/3/5/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become

active. The TPS3824/5 devices include a high-level output RESET. TPS3820/3/4/8 have a watchdog timer that is

periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger

also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. In applications where the

input to the WDI pin may be active (transitioning high and low) when the TPS3820/3/4/8 is asserting RESET, the

If the application requires that input to WDI is active when RESET pin is asserted, then the “A” version of the

device should be used. The “A” versions will not latch the RESET to the asserted state if a WDI pulse is received

while RESET is asserted.

Figure 1 shows how to decouple WDI from the active signal using when using the non

−”A” version. This is

accomplished with an N

−Channel FET in series with the WDI pin, with the gate of the FET connected to the

RESET output. The “A” version of the device does not need this FET but will operate in circuits that have it.

Therefore, the “A” version is backward compatible with the non’”A” versions.

Figure 1.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in

an SOT23-5 package. The TPS382x devices are characterized for operation over a temperature range of

−40°C

to 85°C.

MARKING

TPS3820-33DBVT

TPS3820-33DBVR

2.93 V

PDEI

TPS3820-50DBVT

TPS3820-50DBVR

4.55 V

PDDI

TPS3823-25DBVT

TPS3823-25DBVR

2.25 V

PAPI

TPS3823-30DBVT

TPS3823-30DBVR

2.63 V

PAQI

TPS3823-33DBVT

TPS3823-33DBVR

2.93 V

PARI

TPS3823-50DBVT

TPS3823-50DBVR

4.55 V

PASI

TPS3824-25DBVT

TPS3824-25DBVR

2.25 V

PATI

TPS3824-30DBVT

TPS3824-30DBVR

2.63 V

PAUI

TPS3824-33DBVT

TPS3824-33DBVR

2.93 V

PAVI

TPS3824-50DBVT

TPS3824-50DBVR

4.55 V

PAWI

TPS3825-33DBVT

TPS3825-33DBVR

2.93 V

PDGI

TPS3825-50DBVT

TPS3825-50DBVR

4.55 V

PDFI

TPS3828-33DBVT

TPS3828-33DBVR

2.93 V

PDII

TPS3828-50DBVT

TPS3828-50DBVR

4.55 V

PDHI

TPS3823A-33DBVT

TPS3823A-33DBVR

2.93 V

PYPI

(1)

For the most current package and ordering information see the Package Option Addendum at the end

of this document, or see the TI web site at www.ti.com.

(2)

The DBVT package indicates tape and reel of 250 parts.

(3)

The DBVR package indicates tape and reel of 3000 parts.

(4)

For other threshold voltage versions, please contact the local TI sales office.

2

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