TL7702A, TL7705A, TL7709A, TL7712A, TL7715A

SUPPLY-VOLTAGE SUPERVISORS 

Power-On Reset Generator                                                                                       

Automatic Reset Generation After Voltage Drop

Wide Supply-Voltage Range

Precision Voltage Sensor

Temperature-Compensated Voltage Reference

True and Complement Reset Outputs

Externally Adjustable Pulse Duration

TL7702A, TL7709A, TL7712A, TL7715A . . . D OR P PACKAGE

TL7705A . . . D, P, OR PS PACKAGE, (TOP VIEW)

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package.

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 V_CC attains a value approaching 3.6 V. At this point (assuming that SENSE is above V_IT+), 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. The time delay is determined by the value of the external capacitor C_T: t_d = 1.3 × 10⁴ × C_T, where C_T is in farads (F) and td is in seconds (s).

During power down and when SENSE is below V_IT–, the outputs remain active until V_CC 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.

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.

NOTES:  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.

timing diagram

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†

Supply voltage, V_CC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 V

Input voltage range, V_I , RESIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 20 V

Input voltage range, V_I , SENSE: TL7702A (see Note 2)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   –0.3 V to 6 V

                                                      TL7705A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   –0.3 V to 20 V

                                                       TL7709A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 20 V

                                                        TL7712A, TL7715A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 20 V

High-level output current, I_OH, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA

Low-level output current, I_OL, RESET  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 mA

Package thermal impedance, θ_JA (see Notes 3 and 4):  D package   . . . . . . . . . . . . . . . . . . . . . . . . . . . .   97 °C/W

                                                                                           P package   . .. . . . . . . . . . . . . . . . . . . . . . . . . .   85 °C/W

                                                                                           PS package   . . . . . . . . . . . . . . . . . . . . . . . . . . .  95 °C/W

Operating virtual junction temperature, T_J  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   260 °C

Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  –65 °C to 150 °C

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. All voltage values are with respect to GND.

             2. 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.

             3. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at                        any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C                      can affect reliability.

             4. The package thermal impedance is calculated in accordance with JESD 51-7.