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TC54VN2902ECB Datasheet(PDF) 5 Page - Microchip Technology

Part No. TC54VN2902ECB
Description  Voltage Detector
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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© 2007 Microchip Technology Inc.
DS21434H-page 5
TC54
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 TC54VN, this is an open-drain
condition. If 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. Once this occurs, the output
will become valid. VOUT will be in its active-low state,
while VINMIN < VIN < VDET+ (therefore, VDET+ = VDET
+ VHYST). If the input rises above VDET+, the output will
assume its inactive state (high for TC54VC, open-drain
for TC54VN).
FIGURE 3-1:
Timing Diagram.
VIN
Detect Voltage VDET
Minimum Operating
Voltage
VHYST
VDET +
Output Voltage
Release Voltage
or RESET Voltage
Ground Level
Ground Level
VOUT




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