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TC54VX30 데이터시트(PDF) 5 Page - Microchip Technology |
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TC54VX30 데이터시트(HTML) 5 Page - Microchip Technology |
5 / 16 page 2004 Microchip Technology Inc. DS21434G-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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