TPS3123-xx

TPS3124-xx, TPS3125-xx

TPS3126-xx, TPS3128-xx

SLVS227E

– AUGUST 1999 – REVISED AUGUST 2011

www.ti.com

DESCRIPTION

The TPS312x family of ultralow voltage processor supervisory circuits provides circuit initialization and timing

supervision, primarily for DSP and processor-based systems.

a high precision internal voltage divider.

The TPS3123/5/6/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become

active. The TPS3124 devices do not have the input MR, but include a high-level output RESET same as the

TPS3125 and TPS3126 devices. In addition, the TPS3123/4/8 have a watchdog timer that needs to be triggered

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

This event also reinitializes the watchdog timer.

The circuits are available in a 5-pin SOT23-5 package. The TPS312x devices are characterized for operation

over a temperature range of

–40°C to +85°C.

DEVICE NAME

THRESHOLD VOLTAGE

MARKING

1.08 V

PBNI

1.40 V

PBOI

1.62 V

PBPI

1.08 V

PBQI

1.40 V

PBRI

1.62 V

PBSI

1.08 V

PBTI

–40°C to +85°C

1.40 V

PBUI

1.62 V

PBVI

2.64 V

PBXI

1.14 V

PFOI

1.43 V

PFPI

1.71 V

PFQI

1.43 V

PFSI

1.71 V

PFTI

(1)

Other versions available. Contact Texas Instruments for details; minimum order quantities apply.

(2)

For the most current package and ordering information see the Package Option Addendum at the end of this document, or visit the

device product folder at www.ti.com.

(3)

The DBVR passive indicates tape and reel of 3000 parts.

(4)

The DBVT passive indicates tape and reel of 250 parts.

2

Copyright

© 1999–2011, Texas Instruments Incorporated