3PEAK TPV708 Low Voltage Supervisory Circuits with Power Fail Detector User Guide

3PEAK TPV708 Low Voltage Supervisory Circuits with Power Fail Detector

Specifications

Output Current RESET, RESET, PFO

Product Information

The TPV708 is a family of supervisory circuits designed to monitor power supply voltage levels and provide a power-on reset signal. It includes a power-fail detector with a 1.25-V threshold for monitoring an additional power supply. The reset periods are fixed at 200 ms (typical). The TPV708 is available in an 8-pin SOP package and typically consumes only 4 A, making it suitable for low-power and portable applications.

Product Usage Instructions

Pin Configuration and Functions
The TPV708 SOP8 package has the following pin configuration:

internal pull-up current.
2| VCC| Power supply voltage being monitored.

Usage Guidelines

• Connect the power supply voltage to the VCC pin.
• Connect the ground reference to the GND pin.
• Utilize the manual reset input (MR) to assert the reset signal.

FAQ

What is the purpose of the power-fail detector in the TPV708?
The power-fail detector with a 1.25-V threshold in the TPV708 is used to monitor an additional power supply and trigger an output signal if the voltage falls below the threshold.

How long does the reset signal stay asserted after a power-on reset event?
The reset signal remains asserted for a fixed period of 200 ms (typical) after the power supply voltage goes above the reset threshold or after the manual reset input changes from low to high.

Features

• Precision Low-Voltage Monitoring and Power-Fail Detector
• 200-ms (typical) Reset Timeout
• Manual Reset Input
• Active High and Active Low Reset Output
• Low Power Consumption: 4 μA
• Guaranteed Reset Output Valid to VCC = 1 V
• Power Supply Glitch Immunity
• Temperature Range: −40°C to 125°C
• 8-Pin SOP Package

Applications

• Microprocessor Systems
• Computers
• Controllers
• Intelligent Instruments
• Portable Equipment

Description

The TPV708 is a family of supervisory circuits to monitor power supply voltage levels and provides a power-on reset signal.
A reset signal can be asserted by an external manual reset input.
In addition, there is a power-fail detector with a 1.25-V threshold, which can be used to monitor an additional power supply.
The reset periods are fixed at 200 ms (typical). The TPV708 is available in an 8-pin SOP package and typically consumes only 4 μA, which is suitable for low- power and portable applications.

Typical Application Circuit

Product Family Table

Order Number| Threshold Voltage (V TH )| Marking| Package
---|---|---|---
TPV708V-SO1R (1)| 1.58 V| V8V| SOP8
TPV708W-SO1R (1)| 1.67 V| V8W| SOP8
TPV708Y-SO1R (1)| 2.19 V| V8Y| SOP8
TPV708Z-SO1R (1)| 2.32 V| V8Z| SOP8
TPV708R-SO1R (1)| 2.63 V| V8R| SOP8
TPV708S-SO1R| 2.93 V| V8S| SOP8
TPV708T-SO1R| 3.08 V| V8T| SOP8
TPV708M-SO1R| 4.38 V| V8M| SOP8
TPV708L-SO1R (1)| 4.63 V| V8L| SOP8

1. For future products, contact the 3PEAK factory for more information and samples.

Revision History

μs.
2022-12-20| Rev.A.0| Updated typical application circuit.
2023-02-17| Rev.A.1| Corrected typo.

Pin Configuration and Functions

Table 1. Pin Functions: TPV708

1

| ****

MR

| ****

I

| Manual Reset Input. MR low asserts RESET/RESET pin. It features an internal pull-up current.
2| VCC| P| Power supply voltage being monitored.
3| GND| G| Ground. This pin should be connected to ground reference.

4

| ****

PFI

| ****

I

| Power fail input. When PFI is less than 1.25 V, PFO goes low. If unused, connect PFI to GND.

5

| ****

PFO

| ****

O

| Power fail output. It goes low when PFI is less than 1.25 V, otherwise stays high.
6| NC| –| Not connected.
7| RESET| O| Active low reset push-pull output stage. Asserted whenever VCC is below the reset threshold or by low signal on the MR input. It remains low for 200 ms after VCC goes above the reset threshold or MR goes from low to high.
8| RESET| O| Active high reset push-pull output stage. Asserted whenever VCC is below the reset threshold or by low signal on the MR input. It remains high for 200 ms after VCC goes above the reset threshold or MR goes from low to high.

Specifications

Absolute Maximum Ratings

PFI, MR

| −0.3| 6| V
Output Current| ****

RESET, RESET, PFO

|  | 20| mA
TJ| Maximum Junction Temperature| −40| 150| °C
TA| Operating Temperature Range| −40| 125| °C
TSTG| Storage Temperature Range| −65| 150| °C
TL| Lead Temperature (Soldering 10 sec)|  | 300| °C

1. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
2. This data was taken with the JEDEC low effective thermal conductivity test board.
3. This data was taken with the JEDEC standard multilayer test boards.

ESD, Electrostatic Discharge Protection

1. JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
2. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

Thermal Information

Electrical Characteristics
All test conditions: VCC = 5 V, TA = −40°C to 125°C, unless otherwise noted.

ICC

|

Quiescent Current

|

MR is unconnected (VCC = 1.8 V)

|  | 4| 15| μA

MR is unconnected (VCC = 5 V)

|  | 6| 20| μA

VTH

|

Reset Threshold Voltage of VCC

| TPV708V-SO1R|  | 1.51| 1.58| 1.63| V
TPV708W-SO1R|  | 1.62| 1.67| 1.71| V
TPV708Y-SO1R|  | 2.12| 2.19| 2.25| V
TPV708Z-SO1R|  | 2.25| 2.32| 2.38| V
TPV708R-SO1R|  | 2.55| 2.63| 2.70| V
TPV708S-SO1R|  | 2.82| 2.93| 3.00| V
TPV708T-SO1R|  | 3.00| 3.08| 3.15| V
TPV708M-SO1R|  | 4.18| 4.38| 4.47| V
TPV708L-SO1R|  | 4.50| 4.63| 4.75| V
 |

VTH Temperature Coefficient

|  |  |

80

|  | ppm/° C
VHYS| Hysteresis on VTH| 1.6 ≤ VDD ≤ 4.2 V|  | 2×VTH|  | mV
tRD| VCC Falling to Reset Delay Time| VTH – VCC = 100 mV|  | 20|  | μs
tRP| Reset Timeout Period|  | 140| 200| 280| ms

VOL

|

RESET/RESET Output Low

| VCC ≥ 1 V, ISINK = 50 μA|  |  | 0.3| V
ISINK = 1.2 mA, VCC ≥ 2 V|  |  | 0.4| V

VOH

|

RESET/RESET Output Low

|

ISOURCE = 800 μA, VCC ≥ 5 V

| 0.7 × VCC|  |  |

V

Manual Reset Function
VIL|

MR Logic Low Input

|  | 0|  | 0.3VCC| V
VIH|

MR Logic High Input

|  | 0.7VCC|  |  | V
tPW|

MR Input Pulse Width

|  | 6|  |  | μs
tGR|

MR Glitch Rejection

|  |  |  | 100| ns
tMD|

MR to Reset Delay

|  |  | 2| 10| μs
IPU|

MR Pull-up Current

| VCC = 3 V|  | 80|  | μA
Power Fail Function
VPF| Power Fail Input Threshold| PFI falling| 1.18| 1.25| 1.33| V
VOL_PF|

PFO Output Low

| ISINK = 1.6 mA, VCC ≥ 5 V|  |  | 0.4| V

VOH_PF

|

PFO Output High

|

ISOURCE = 800 μA, VCC ≥ 5 V

| 0.7 × VCC|  |  |

V

Typical Performance Characteristics

All test conditions: VCC = 5 V, TA = + 25°C, unless otherwise noted.

Detailed Description

Overview

The TPV708 series provides supply voltage supervision, manual reset function as well as a 1.25-V power-fail detector.

Functional Block Diagram

Feature Description

RESET Output
The TPV708 features an active-low and active-high push-pull output. The reset output is asserted when VCC is below the reset threshold (VTH), or when MR is driven low. Reset remains asserted for the duration of the reset delay time (tRP) after VCC rises above the reset threshold, or after MR transitions from low to high. Figure 6 shows the reset outputs.

Power-Fail Detector
The power-fail detector is a 1.25-V comparator, which can monitor an external power supply through a resistive divider. When the voltage on the PFI is lower than 1.25 V, the comparator output goes low, indicating a power fail, which can be used as an early warning of the power fail.

Manual RESET (MR) Input
The TPV708 features a manual reset input (MR), which, when driven low, asserts the reset output. When MR transitions from low to high, reset remains asserted for the duration of the reset active timeout period before de-asserting.

The MR input has an internal pull-up current so that the input is always high when unconnected. Noise immunity is provided on the MR input, and the fast and negative-going transients are ignored. A 0.1-μF capacitor between MR and ground provides additional noise immunity.

Application and Implementation

Note
Information in the following application sections is not part of the 3PEAK’s component specification and 3PEAK does not
warrant its accuracy or completeness. 3PEAK’s customers are responsible for determining suitability of components for
their purposes. Customers should validate and test their design implementation to confirm system functionality.

Application Information
Figure 7 shows the typical application circuit of TPV708.

Tape and Reel Information

Package Outline Dimensions

SOP8

SO1 (SOP-8-A)

NOTES

1. Do not include mold flash or protrusion.
2. This drawing is subject to change without notice.

Order Information

Order Number

| Operating Temperature Range| ****

Package

| ****

Marking Information

| ****

MSL

| ****

Transport Media, Quantity

| ****

Eco Plan

---|---|---|---|---|---|---
TPV708V-SO1R (1)| −40 to 125°C| SOP8| V8V| 1| Tape and Reel, 4000| Green
TPV708W-SO1R (1)| −40 to 125°C| SOP8| V8W| 1| Tape and Reel, 4000| Green
TPV708Y-SO1R (1)| −40 to 125°C| SOP8| V8Y| 1| Tape and Reel, 4000| Green
TPV708Z-SO1R (1)| −40 to 125°C| SOP8| V8Z| 1| Tape and Reel, 4000| Green
TPV708R-SO1R (1)| −40 to 125°C| SOP8| V8R| 1| Tape and Reel, 4000| Green
TPV708S-SO1R| −40 to 125°C| SOP8| V8S| 1| Tape and Reel, 4000| Green
TPV708T-SO1R| −40 to 125°C| SOP8| V8T| 1| Tape and Reel, 4000| Green
TPV708M-SO1R| −40 to 125°C| SOP8| V8M| 1| Tape and Reel, 4000| Green
TPV708L-SO1R (1)| −40 to 125°C| SOP8| V8L| 1| Tape and Reel, 4000| Green

1. For future products, contact the 3PEAK factory for more information and samples.

Green: 3PEAK defines “Green” to mean RoHS compatible and free of halogen substances.

IMPORTANT NOTICE AND DISCLAIMER

Copyright© 3PEAK 2012-2023. All rights reserved.
Trademarks. Any of the 思瑞浦 or 3PEAK trade names, trademarks, graphic marks, and domain names contained in this document /material are the property of 3PEAK. You may NOT reproduce, modify, publish, transmit or distribute any Trademark without the prior written consent of 3PEAK.

Performance Information. Performance tests or performance range contained in this document/material are either results of design simulation or actual tests conducted under designated testing environment. Any variation in testing environment or simulation environment, including but not limited to testing method, testing process or testing temperature, may affect actual performance of the product.
Disclaimer. 3PEAK provides technical and reliability data (including data sheets), design resources (including reference designs), application or other design recommendations, networking tools, security information and other resources “As Is”.

3PEAK makes no warranty as to the absence of defects, and makes no warranties of any kind, express or implied, including without limitation, implied warranties as to merchantability, fitness for a particular purpose or non- infringement of any thirdparty’s intellectual property rights. Unless otherwise specified in writing, products supplied by 3PEAK are not designed to be used in any life-threatening scenarios, including critical medical applications, automotive safety-critical systems, aviation,aerospace, or any situations where failure could result in bodily harm, loss of life, or significant property damage. 3PEAK disclaims all liability for any such unauthorized use.

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