TC54VC1501ECTTR datasheet(4/12 Pages) MICROCHIP

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TC54

DS21434C-page 4

 2002 Microchip Technology Inc.

3.0

DETAILED DESCRIPTION

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

the output will be at a logic high, see Figure 3-1. In the

case of the TC54V, this is an open-drain condition. If

and when the input falls below VDET -, the output will

pull down (Logic 0) to VSS. Generally, VOUT can pull

down to within 0.5V of VSS at rated output current and

input

voltage.

(See

Section 1.0,

Electrical

Characteristics).

The output, VOUT, will stay 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 will become

valid. VOUT will be 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. (High for TC54VC, open-drain for

TC54VN).

FIGURE 3-1:

TIMING DIAGRAM

4.0

APPLICATIONS INFORMATION

Refer to Microchip Technology Application Note #779,

Using the TC54 Voltage Detector.

VIN

Detect Voltage VDET-

Minimum Operating

Voltage

VHYST

VDET+

Output Voltage

Release Voltage

or RESET Voltage

Ground Level

VOUT

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