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1 Features

? Precision supply voltage monitor:

2.5 V, 3 V, 3.3 V, 5 V

? Power-on reset generator with a

fixed delay time of 200 ms

? Supply current: 9 μA (typical)

? Temperature range: –40°C to +85°C

? 3-Pin SOT-23 package

? Pin-for-pin compatible with the MAX809

2 Applications

? Factory automation

? Portable and battery-powered equipment

? Set-top boxes

? Servers

? Appliances

? Electricity meters

? Building automation

3 Description

The TLV809 family of supervisory circuits provides

circuit initialization and timing supervision, primarily

for digital signal processors (DSPs) and processorbased

systems. The newer TLV809E device is a pinto-

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.