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  • TL77xxA Supply-Voltage Supervisors

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

      PRODUCTION DATA.  

  • CONTENTS
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  • TL77xxA Supply-Voltage Supervisors
  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
  14. IMPORTANT NOTICE

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
  • slvs028k_oa
  • slvs028k_pm
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DATA SHEET

TL77xxA Supply-Voltage Supervisors

1 Features

  • Power-On Reset Generator
  • Automatic Reset Generation After Voltage Drop
  • Wide Supply-Voltage Range
  • Precision Voltage Sensor
  • Temperature-Compensated Voltage Reference
  • Externally Adjustable Pulse Duration

2 Applications

  • Computers
  • Tablets
  • Smart Phones
  • Servers
  • Music Players

3 Description

The TL77xxA family of integrated-circuit supply-voltage supervisors is designed specifically for use as reset controllers in microcomputer and microprocessor systems. The supply-voltage supervisor monitors the supply for undervoltage conditions at the SENSE input. During power up, the RESET output becomes active (low) when VCC attains a value approaching 3.6 V. At this point (assuming that SENSE is above VIT+), the delay timer function activates a time delay, after which outputs RESET and RESET go inactive (high and low, respectively). When an undervoltage condition occurs during normal operation, RESET and RESET go active.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TL77xxA SOIC (8) 4.90 mm × 3.91 mm
PDIP (8) 9.81 mm × 6.35 mm
TL7705A SO (8) 6.20 mm × 5.30 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Three-Supply Monitoring

TL7702A TL7705A TL7709A TL7712A TL7715A app1_slvs028.gif

4 Revision History

Changes from J Revision (January 2015) to K Revision

  • Added SO (8) to Device Information tableGo
  • Changed RESET to RESET in Timing DiagramGo
  • Added Receiving Notification of Documentation Updates sectionGo

Changes from I Revision (July 2009) to J Revision

  • Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table, Typical Characteristics, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.Go
  • Deleted Ordering Information table.Go

5 Pin Configuration and Functions

TL7702A, TL7709A, TL77012A, TL7715A D or P Package
TL7705A D, P, or PS Package
8-Pin SOIC, PDIP, or SO
Top View

Pin Functions

PIN TYPE DESCRIPTION
NAME NO.
CT 3 I/O External timing-capacitor pin
GND 4 — Device ground
REF 1 O Voltage reference output
RESET 6 O Supervisor reset signal output
RESET 5 O Supervisor reset signal output (inverted)
RESIN 2 I Reset input
SENSE 7 I Sense input
VCC 8 — Power Supply

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)
MIN MAX UNIT
VCC Supply voltage(3) 20 V
VI Input voltage, RESIN –0.3 20 V
VI Input voltage range SENSE TL7702A(2) –0.3 6 V
TL7705A –0.3 20 V
TL7709A –0.3 20 V
TL7712A, TL7715A –0.3 20 V
IOH High-level output current, IOH, RESET –30 mA
IOL Low-level output current, IOL, RESET 30 mA
TJ Operating virtual junction temperature 150 °C
Tstg Storage temperature –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to GND.
(3) For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed VCC − 1 V or 6 V, whichever is less

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) 1000 V
Charged device model (CDM), per JEDEC specification JESD22-C101(2) 1000
(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.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
VCC Supply Voltage 3.5 18 V
VIH High-level input voltage at RESIN 2 V
VIL Low-level input voltage at RESIN 0.6 V
VI Input voltage, SENSE TL7702A 0 See(1) V
TL7705A 0 10
TL7709A 0 15
TL7712A 0 20
TL7715A 0 20
IOH High-level output current, RESET –16 mA
IOL Low-level output current, RESET 16 mA
TA Operating free-air temperature TL77xxAC 0 70 °C
TL77xxAI –40 85
(1) For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed VCC − 1 V or 6 V, whichever is less.

6.4 Thermal Information

THERMAL METRIC(1) TL77xxA UNIT
D P PS
8 PINS 8 PINS 8 PINS
RθJA Junction-to-ambient thermal resistance 97 85 95 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

6.5 Electrical Characteristics

over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS(1) TL77xxAC
TL77xxAI		 UNIT
MIN TYP MAX
VOH High-level output voltage, RESET IOH = –16 mA VCC – 1.5 V
VOL Low-level output voltage, RESET IOL = 16 mA 0.4 V
Vref Reference Voltage TA = 25°C 2.48 2.53 2.58 V
VIT– Negative-going input threshold voltage, SENSE TL7702A TA = 25°C 2.48 2.53 2.58 V
TL7705A 4.5 4.55 4.6
TL7709A 7.5 7.6 7.7
TL7712A 10.6 10.8 11
TL7715A 13.2 13.5 13.8
Vhys Hysteresis, SENS (VIT+ – VIT–) TL7702A TA = 25°C 10 mV
TL7705A 15
TL7709A 20
TL7712A 35
TL7715A 45
II Input current RESIN VI = 2.4 V to VCC 20 µA
VI = 0.4 V –100
SENSE TL7702A Vref < VI < VCC – 1.5 V 0.5 2
IOH High-level output current, RESET VO = 18 V 50 µA
IOL Low-level output current, RESET VO = 0 –50 µA
ICC Supply current All inputs and outputs open 1.8 3 mA
(1) All electrical characteristics are measured with 0.1-µF capacitors connected at REF, CT, and VCC to GND.

6.6 Switching Characteristics

over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS(1) TL77xxAC
TL77xxAI		 UNIT
MIN TYP MAX
Output pulse duration CT = 0.1 µF 0.65 1.2 2.6 msec
Input pulse duration at RESIN 0.4 µs
tw(S) Pulse duration at sense input to switch outputs VIH = VIT− + 200 mV, VIL = VIT− − 200 mV 2 µs
tpd propagation delay time, RESIN to RESET VCC = 5V 1 µs
tr Rise time RESET VCC = 5 V(2) 0.2 µs
RESET 3.5
tf Fall time RESET VCC = 5 V(2) 3.5 µs
RESET 0.2
(1) All switching characteristics are measured with 0.1-µF capacitors connected at REF and VCC to GND.
(2) The rise and fall times are measured with a 4.7-kΩ load resistor at RESET and RESET.
TL7702A TL7705A TL7709A TL7712A TL7715A timing_slvs028.gif Figure 1. Timing Diagram

6.7 Typical Characteristics

TL7702A TL7705A TL7709A TL7712A TL7715A tc1_slvs028.gif Figure 2. Assertion Time vs Load Resistance
TL7702A TL7705A TL7709A TL7712A TL7715A tc3_slvs028.gif Figure 4. Assertion Time vs Load Capacitance
TL7702A TL7705A TL7709A TL7712A TL7715A tc2_slvs028.gif Figure 3. Deassertion Time vs Load Resistance
TL7702A TL7705A TL7709A TL7712A TL7715A tc4_slvs028.gif Figure 5. De-assertion Time vs Load Capacitance

7 Parameter Measurement Information

TL7702A TL7705A TL7709A TL7712A TL7715A pmi_slvs028.gif Figure 6. Voltage Waveform

8 Detailed Description

8.1 Overview

The TL77xxA family of integrated-circuit supply-voltage supervisors is designed specifically for use as reset controllers in microcomputer and microprocessor systems. The supply-voltage supervisor monitors the supply for undervoltage conditions at the SENSE input. During power up, the RESET output becomes active (low) when VCC attains a value approaching 3.6 V. At this point (assuming that SENSE is above VIT+), the delay timer function activates a time delay, after which outputs RESET and RESET go inactive (high and low, respectively). When an undervoltage condition occurs during normal operation, RESET and RESET go active. To ensure that a complete reset occurs, the reset outputs remain active for a time delay after the voltage at the SENSE input exceeds the positive-going threshold value.

During power down and when SENSE is below VIT−, the outputs remain active until VCC falls below 2 V. After this, the outputs are undefined. An external capacitor (typically 0.1 μF) must be connected to REF to reduce the influence of fast transients in the supply voltage.

Five versions of this circuit are available:

  • TL7705A (Vt = 4.55 V): Application in TTL-systems and microcomputer systems which require a 5 volt supply (for example, TMS7000)
  • TL7709A (Vt = 7.6 V): Application in microcomputer systems using the TMS1XXXNLL
  • TL7712A (Vt = 10.8 V): Application in CMOS, microprocessor, and memory circuits with a 12 volt supply.
  • TL7715A (Vt = 13.5 V): Application in circuits which operate with a supply voltage of 15 V, as is found often in analog circuits.
  • TL7702A (Vt = 2.5 V): Application in systems where other supply voltages are used. The required trigger level my be adjusted with an external resistor divider at the SENSE input.

8.2 Functional Block Diagram

The functional block diagram is shown for illustrative purposes only; the actual circuit includes a trimming network to adjust the reference voltage and sense-comparator trip point.

TL7702A TL7705A TL7709A TL7712A TL7715A fbd_slvs028.gif
A. TL7702A: R1 = 0 Ω, R2 = open
TL7705A: R1 = 7.8 kΩ, R2 = 10 kΩ
TL7709A: R1 = 19.7 kΩ, R2 = 10 kΩ
TL7712A: R1 = 32.7 kΩ, R2 = 10 kΩ
TL7715A: R1 = 43.4 kΩ, R2 = 10 kΩ
B. Resistor values shown are nominal.

8.3 Feature Description

8.3.1 Wide Supply-Voltage Range

Th TL77xxA family operates of a wide supply voltage range of 3.5 V to 18 V.

8.3.2 Externally Adjustable Pulse Duration

The time delay is determined by the value of the external capacitor CT: td = 1.3 × 104 × CT, where CT is in farads (F) and td is in seconds (s).

8.3.3 Temperature-Compensated Voltage Reference

The series TL77xxA incorporates an extremely stable reference voltage source. This voltage source can also be used in applications where a constant voltage source is required. The reference voltage varies less than 10 mV over the supply voltage range of 3.5 V to 18 V. The same stability of the reference voltage is maintained, when the ambient temperature is changed. The reference's voltage varies only 16 mV when the ambient temperature is changed from –40°C to +85°C.

8.4 Device Functional Modes

Figure 7 shows the timing of the various signals. In this example the SENSE input is connected to the supply voltage VCC as in typical applications of this device. The minimum supply voltage for which the function of this device is guaranteed is 3.6 V. After power-on, the outputs are undefined until the minimum supply voltage Vres is reached. For the TL77xxA the minimum supply voltage is Vres = 3 V (typical 2.5 V). Beyond the voltage Vres the capacitor CT is first kept discharged, and the outputs stay in the active state (RESET = High, RESET = Low). When the input voltage becomes higher than the threshold voltage Vt, the thyristor is turned off and the capacitor is charged. After a delay, td, the voltage at the capacitor passes the trigger level of the output comparator and the outputs become inactive. The circuit to be initialized is now set to a defined state and starts the correct operation.

TL7702A TL7705A TL7709A TL7712A TL7715A timing_diag_lvs028.gif
A. Note: SENSE Input connected to VCC
Figure 7. Timing Diagram

 
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