TC54_04 Datasheet, PDF (5/16 Pages) Microchip Technology – Voltage Detector

TC54
3.0 DETAILED DESCRIPTION
In normal steady-state operation when V_IN > V_DET –,
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 V_DET –, the output
will pull down (Logic 0) to V_SS. Generally, V_OUT can
pull down to within 0.5V of V_SS at rated output current
and input voltage. (See Section 1.0 “Electrical
Characteristics”).
The output (V_OUT) will stay valid until the input voltage
falls below the minimum operating voltage (V_INMIN) of
0.7V. Below this minimum operating voltage the output
is undefined. During power-up (or anytime V_IN has
fallen below V_INMIN), V_OUT will remain undefined until
V_IN rises above V_INMIN. Once this occurs, the output
will become valid. V_OUT will be in its active-low state,
while V_INMIN < V_IN < V_DET+ (therefore, V_DET+ = V_DET –
+ V_HYST). If the input rises above V_DET+, the output will
assume its inactive state (high for TC54VC, open-drain
for TC54VN).
V_IN
Detect Voltage V_DET –
Minimum Operating
Voltage
Ground Level
V_DET +
V_HYST
Release Voltage
or RESET Voltage
V_OUT
Output Voltage
FIGURE 3-1:
Ground Level
Timing Diagram.
 2004 Microchip Technology Inc.
DS21434G-page 5