3-pin voltage supervisor (reset IC) with active-low, push-pull reset

The TLV809 family of supervisory

circuits provides circuit initialization and timing supervision, primarily for

digital signal processors (DSPs) and processor-based systems. The newer TLV809E device is a pin-to-pin compatible alternative.

During power-on,

RESET is asserted when the supply voltage (VDD)

becomes greater than 1.1 V. Thereafter, the supervisory circuit monitors

VDD and keeps RESET active as long as

VDD remains below the threshold voltage, VIT. An internal

timer delays the return of the output to the inactive state (high) to ensure proper

system reset. The delay time (td(typ) = 200 ms) starts after

VDD rises above the threshold voltage, VIT. When the

supply voltage drops below the VIT threshold voltage, the output becomes

active (low) again. No external components are required. All devices in this family

have a fixed sense-threshold voltage (VIT) set by an internal voltage

divider.

This product family is designed for

supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 3-pin

SOT-23 package. The TLV809 devices are characterized for operation over a

temperature range of –40°C to +85°C.