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SN74LV123ATPWRG4Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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SN74LV123ATPWRG4Q1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page 11 SN74LV123A-Q1 www.ti.com SCLS467F – FEBRUARY 2003 – REVISED JUNE 2016 Product Folder Links: SN74LV123A-Q1 Submit Documentation Feedback Copyright © 2003–2016, Texas Instruments Incorporated Feature Description (continued) 8.3.1 Power-Down Considerations Large values of Cext can cause problems when powering down the SN74LV123A-Q1 devices because of the amount of energy stored in the capacitor. When a system containing this device is powered down, the capacitor can discharge from VCC through the protection diodes at pin 2 or pin 14. Current through the input protection diodes must be limited to 30 mA; therefore, the turn-off time of the VCC power supply must not be faster than t = VCC × Cext / 30 mA. For example, if VCC = 5 V and Cext = 15 pF, the VCC supply must turn off no faster than t = (5 V) × (15 pF) / 30 mA = 2.5 ns. Usually, this is not a problem because power supplies are heavily filtered and cannot discharge at this rate. The SN74LV123A-Q1 devices can sustain damage when a more rapid decrease of VCC to zero occurs. Use external clamping diodes to avoid this possibility. 8.4 Device Functional Modes Table 1 shows the functional modes for each monostable multivibrator in the SN74LV123A-Q1. (1) These outputs are based on the assumption that the indicated steady-state conditions at the A and B inputs have been set up long enough to complete any pulse started before the setup. Table 1. Function Table (Each Multivibrator) INPUTS OUTPUTS CLR A B Q Q L X X L H X H X L(1) H(1) X X L L(1) H(1) H L ↑ H ↓ H ↑ L H |
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