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DS26C31T Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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DS26C31T Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 12 page DC Electrical Characteristics (Continued) V CC = 5V ± 10% (unless otherwise specified) (Note 4) Symbol Parameter Conditions Min Typ Max Units I OFF Output Leakage Current DS26C31T V OUT = 6V 100 µA Power Off (Note 5) V CC = 0V V OUT = −0.25V −100 µA DS26C31M V OUT = 6V 100 µA V CC = 0V V OUT = 0V −100 µA (Note 8) Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of “Electrical Characteristics” provide conditions for actual device operation. Note 2: Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive, all currents out of device pins are negative. Note 3: Ratings apply to ambient temperature at 25˚C. Above this temperature derate N package at 13.89 mW/˚C, J package 16.13 mW/˚C, M package 9.80 mW/˚C, E package 12.20 mW/˚C, and W package 6.75 mW/˚C. Note 4: Unless otherwise specified, min/max limits apply across the recommended operating temperature range. All typicals are given for VCC = 5V and TA = 25˚C. Note 5: See EIA Specification RS-422 for exact test conditions. Note 6: Measured per input. All other inputs at VCC or GND. Note 7: This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted. Note 8: The DS26C31M (−55˚C to +125˚C) is tested with VOUT between +6V and 0V while RS-422A condition is +6V and −0.25V. Switching Characteristics V CC = 5V ±10%,tr ≤ 6 ns, tf ≤ 6ns(Figures 1, 2, 3, 4) (Note 4) Symbol Parameter Conditions Min Typ Max Units DS26C31T CS26C31M t PLH,tPHL Propagation Delays S1 Open 2 6 11 14 ns Input to Output Skew (Note 9) S1 Open 0.5 2.0 3.0 ns t TLH,tTHL Differential Output Rise S1 Open 6 10 14 ns And Fall Times t PZH Output Enable Time S1 Closed 11 19 22 ns t PZL Output Enable Time S1 Closed 13 21 28 ns t PHZ Output Disable Time S1 Closed 5 9 12 ns (Note 10) t PLZ Output Disable Time S1 Closed 7 11 14 ns (Note 10) C PD Power Dissipation 50 pF Capacitance (Note 11) C IN Input Capacitance 6 pF Note 9: Skew is defined as the difference in propagation delays between complementary outputs at the 50% point. Note 10: Output disable time is the delay from ENABLE or ENABLE being switched to the output transistors turning off. The actual disable times are less than in- dicated due to the delay added by the RC time constant of the load. Note 11: CPD determines the no load dynamic power consumption, PD = CPD VCC2f+ICC VCC, and the no load dynamic current consumption, IS = CPD VCC f+ ICC. Comparison Table of Switching Characteristics into “LS-Type” Load V CC = 5V, TA = 25˚C, tr ≤ 6 ns, tf ≤ 6ns(Figures 2, 4, 5, 6) (Note 12) Symbol Parameter Conditions DS26C31T DS26LS31C Units Typ Max Typ Max t PLH,tPHL Propagation Delays C L = 30 pF Input to Output S1 Closed 6 8 10 15 ns S2 Closed Skew (Note 9) C L = 30 pF S1 Closed 0.5 1.0 2.0 6.0 ns S2 Closed www.national.com 3 |
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