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TLV9032DDFR.A 数据表(PDF) 31 Page - Texas Instruments |
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TLV9032DDFR.A 数据表(HTML) 31 Page - Texas Instruments |
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31 / 85 page  + ± 100 NŸ 10 NŸ +V 51 NŸ 10 0Ÿ + ± 10 NŸ 10 0Ÿ + ± 10 NŸ 10 0Ÿ 51 NŸ 51 NŸ V1 V3 V2 + ± R 100 NŸ 100 NŸ VC C Input Gating Signal VIN t0 0 V + t4 Open Drain Output t0 t1 t2 t3 t4 V1 V2 V3 VC +VLOGIC2 RPU +VLOGIC3 RPU +VLOGIC1 RPU RPU not required if using push-pull output devices t0 t1 t0 t2 t0 t3 1 2 3 4 Figure 7-13. Time Delay Generator Consider the case of VIN = 0. The output of comparator 4 is also at ground, "shorting" the capacitor and holding the node to 0V. This implies that the outputs of comparators 1, 2, and 3 are also at 0V. When an input signal is applied, the output of open drain comparator 4 goes High-Z and C charges exponentially through R. This is indicated in the graph. The output voltages of comparators 1, 2, and 3 switch to the high state in sequence when VC rises above the reference voltages V1, V2 and V3. A small amount of hysteresis has been provided by the 10kΩ and 10MΩ resistors to insure smooth switching when the RC time constant is chosen to give long delay times. A good starting point is R = 100kΩ and C = 0.01µF to 1µF. All outputs immediately go low when VIN falls to 0V, due to the comparator output going low and immediately discharging the capacitor. Comparator 4 must be a open-drain type output (TLV902x), whereas comparators 1 though 3 can be either open drain or push-pull output, depending on system requirements. RPU is not required for push-pull output devices. 7.2.5 Logic Level Shifter The output of the TLV902x is the uncommitted drain of the output transistor. Many open-drain outputs can be tied together to provide an output OR'ing function if desired. + ± R1 VCC Logic Out VLOGIC 0 RPULLUP VLOGIC Logic In 10 kŸ R2 10 kŸ VCC VCC 0 Open Drain Output Figure 7-14. Universal Logic Level Shifter www.ti.com TLV9020, TLV9021, TLV9022, TLV9024, TLV9030, TLV9031, TLV9032, TLV9034 SNOSDA3H – JUNE 2020 – REVISED NOVEMBER 2025 Copyright © 2025 Texas Instruments Incorporated Submit Document Feedback 31 Product Folder Links: TLV9020 TLV9021 TLV9022 TLV9024 TLV9030 TLV9031 TLV9032 TLV9034 |
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