TLC770X Datasheet, PDF (11/27 Pages) Texas Instruments – BiCMOS SUPPLY VOLTAGE SUPERVISORS

Figure 7. Timing Diagram
The capacitor C_t determines the time period t_d, for which the outputs are kept in an active state after reaching the
threshold voltage V_t. The relationship between the time delay t_d and the capacitance C_t can be calculated as follows:
t_d
=
2.1⋅ 10⁴
V
A
⋅ C_t
The time period t_d can be chosen to be of any desired length. For long delay times t_d, appropriately big capacitors
must then be used. In order to ensure that, when using large capacitance values of several microfarads and more,
the discharge current does not cause a malfunction, a current limiting circuit has been integrated into the device.
The maximum capacitance which can be used depends in the last resort on the leakage current of the capacitor. The
latter works in opposition to the charging current I_Charge, and thus influences the delay time t_d.
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