SBVS211B August   2012  – April 2015

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Push-Button Timer Selection (TS)
      2. 7.3.2 Inputs
        1. 7.3.2.1 TPS3420 Inputs (PB1, PB2)
        2. 7.3.2.2 TPS3421 Inputs (PB1, PB2)
        3. 7.3.2.3 TPS3422 Inputs (PB1)
      3. 7.3.3 Output (RST)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation (VDD > 1.6 V)
      2. 7.4.2 Below VDD(min) (1.6 V > VDD > 1.3 V)
      3. 7.4.3 Power-On Reset (VDD < 1.3 V)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Single Input With Fixed Reset Pulse Duration
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Dual Input Applications
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
      3. 8.2.3 Latched Reset Signal
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Evaluation Modules
        2. 11.1.1.2 Spice Models
      2. 11.1.2 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Related Links
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

TPS3420, TPS3421: DRY Package
6-Pin USON
Top View
TPS342 po_bvs211.gif
TPS3422: DRY Package
6-Pin USON
Top View
TPS342 po_tps3422_bvs211.gif

Pin Functions

PIN I/O DESCRIPTION
NAME TPS3420/21 TPS3422
GND 2 2 — Ground.
PB1 3 3 I Push-button input. PB1 and PB2 must be held low for greater than tTIMER time to assert the reset output.
PB2 6 — I Second push-button input. PB1 and PB2 must be held low for greater than tTIMER time to assert the reset output.
RST 1 1 O Active low, open-drain output. Reset is asserted (goes low) when both PB1 and PB2 are held low for longer than tTIMER time (only PB1 for TPS3422).
For TPS3420: Reset is deasserted when either PBx input goes high.
For TPS3421,TPS3422: Reset is deasserted after fixed time of tRST.
TS 5 5 I Time delay selection input. Connect to VCC or GND for different tTIMER selections. In normal operation, the TS pin state should not be changed because it is intended to be permanently connected to either GND or VCC. If switching the TS pin is required, it should be done during power off, or when either PBx input is high.
TST — 6 — Connect this pin to GND or VCC during normal device operation.
VCC 4 4 I Supply voltage input. Connect a 1.6-V to 6.5-V supply to VCC to power the device. It is good analog design practice to place a 0.1-µF ceramic capacitor close to this pin.