SLVS028K April   1983  – September 2016 TL7702A , TL7705A , TL7709A , TL7712A , TL7715A

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 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Wide Supply-Voltage Range
      2. 8.3.2 Externally Adjustable Pulse Duration
      3. 8.3.3 Temperature-Compensated Voltage Reference
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
  • P|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9 Application and Implementation

NOTE

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

9.1 Application Information

This application shows the initialization circuit diagrams for a microprocessor system with supply voltage Vcc = 5 V. The external components required are the decoupling capacitor Cref for the reference voltage and the timing capacitor CT. The outputs of the TL77xxA are open collector outputs. In Figure 8 therefore a pull-up resistor is shown at the RESET output to ensure the correct HIGH level.

9.2 Typical Application

TL7702A TL7705A TL7709A TL7712A TL7715A app2_slvs028.gif Figure 8. Reset Controller Schematic for a Microprocessor

9.2.1 Design Requirements

  • 5-V microprocessor supply voltage
  • td = 1.3 ms

9.2.2 Detailed Design Procedure

  • Select reasonable values for pull-up/pull-down resistors for RESET and RESET. This design uses 10 kΩ.
  • Choose CT = 0.1 µF to achieve td = 1.3 ms
  • This design uses only the active-low reset output (RESET) because the example microcontroller resets when the input is Low.

9.2.3 Application Curves

TL7702A TL7705A TL7709A TL7712A TL7715A D005_slvs028.gif Figure 9. Supervisor RESET Output Voltage vs VCC
TL7702A TL7705A TL7709A TL7712A TL7715A D007_slvs028.gif Figure 11. Supervisor RESET Output Voltage vs VCC at Transition
TL7702A TL7705A TL7709A TL7712A TL7715A D006_slvs028.gif Figure 10. Supervisor RESET Output Voltage vs VCC
TL7702A TL7705A TL7709A TL7712A TL7715A D008_slvs028.gif Figure 12. Supervisor RESET Output Voltage vs VCC at Transition

9.3 System Examples

TL7702A TL7705A TL7709A TL7712A TL7715A app1_slvs028.gif Figure 13. Multi Power-Supply System Reset Generation Schematic
TL7702A TL7705A TL7709A TL7712A TL7715A app3_slvs028.gif Figure 14. Eliminating Undefined States Using a P-Channel JFET Schematic
TL7702A TL7705A TL7709A TL7712A TL7715A app4_slvs028.gif Figure 15. Eliminating Undefined States Using PNP Transistor Schematic