TC51 datasheet(4/14 Pages) MICROCHIP

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TC51

DS21429B-page 4

 2002 Microchip Technology Inc.

3.0

DETAILED DESCRIPTION

In normal steady-state operation, when VIN > VDET -,

the output is high, see Figure 3-1. If and when the

input falls below VDET -, the output pulls down (Logic 0)

to VSS. Generally, VOUT can pull down to within 0.5V of

VSS at rated output current and input voltage. (Also see

Section 1.0, Electrical Characteristics).

The output, VOUT, stays valid until the input voltage falls

below the minimum operating voltage, VINMIN, of 0.7V.

Below this minimum operating voltage, the output is

undefined. During power-up or anytime VIN has fallen

below VINMIN, VOUT will remain undefined until VIN rises

above VINMIN, at which time the output becomes valid.

VOUT is maintained in its active low state while

VINMIN <VIN < VDET+. (VDET+ = VDET - + VHYST). If and

when the input rises above VDET+, the output will

assume its inactive state after Delay Time (TDLY).

FIGURE 3-1:

TIMING DIAGRAM

VIN

Detect Voltage VDET-

Minimum Operating

Voltage

VHYST

VDET+

Output Voltage

Release

Voltage

Ground Level

Delay Time (TDLY)

VOUT

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