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SN75ALS171 Datasheet(PDF) 6 Page - Texas Instruments |
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SN75ALS171 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 24 page SN75ALS171, SN75ALS171A TRIPLE DIFFERENTIAL BUS TRANSCEIVERS SLLS056D – AUGUST 1987 – REVISED SEPTEMBER 1995 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 switching characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP† MAX UNIT ALS171 RL = 54 Ω, See Figure 3, 3 13 ALS171A L , CL = 50 pF g, 6 11 td(OD) Differential output delay time ALS171 RL1 = RL3 = 165 Ω, CL =60 pF VTERM = 5 V, See Figure 6 3 13 ns ALS171A CL = 60 pF, RL2 = 75 Ω, See Figure 6 6 11 t k( ) Pulse skew‡ RL = 54 Ω, See Figure 3 CL = 50 pF, 1 5 ns tsk(p) Pulse skew‡ RL1 = RL3 = 165 Ω, CL = 60 pF, RL2 = 75 Ω, See Figure 6 1 5 ns § ALS171 RL = 54 Ω, CL = 50 pF, 10 t k(li ) Skew limit§ ALS171A L , See Figure 3 L , 5 ns tsk(lim) Skew limit§ ALS171 RL1 = RL3 = 165 Ω, RL2 = 75 Ω, 10 ns ALS171A L1 L3 , CL = 60 pF, L2 , See Figure 6 5 RL = 54 Ω, See Figure 3 CL = 50 pF, 3 8 13 tt(OD) Differential-output transition time RL1 = RL3 = 165 Ω, CL = 60 pF, See Figure 6 RL2 = 75 Ω, VTERM = 5 V, 3 8 13 ns tPZH Output enable time to high level RL = 110 Ω, See Figure 4 30 50 ns tPZL Output enable time to low level RL = 110 Ω, See Figure 5 30 50 ns tPHZ Output disable time from high level RL = 110 Ω, See Figure 4 3 8 13 ns tPLZ Output disable time from low level RL = 110 Ω, See Figure 5 3 8 13 ns tPDE Differential-output enable time RL1 = RL3 = 165 Ω, RL2 = 75 Ω, 8 30 45 ns tPDZ Differential-output disable time L1 L3 CL = 60 pF, L2 See Figure 7 5 10 45 ns † All typical values are at VCC = 5 V and TA = 25°C. ‡ Pulse skew is defined as the | td(ODH) – td(ODL)| of each channel. § Skew limit is the maximum difference in propagation delay times between any two channels of one device and between any two devices. This parameter is applicable at one VCC and operating temperature within the recommended operating conditions. SYMBOL EQUIVALENTS DATA-SHEET PARAMETER EIA/TIA-422-B RS-485 VO Voa, Vob Voa, Vob |VOD1 | Vo Vo |VOD2 | Vt (RL = 100 Ω) Vt (RL = 54 Ω) |VOD3 | Vt (Test Termination Measurement 2) Vtest Vtst ∆|VOD| ||V t |– |V t || ||V t |– |V t || VOC |Vos | |Vos | ∆|VOC| |Vos –Vos | |Vos –Vos | IOS |I sa |, | Isb | IO |I xa |, | Ixb | Iia, Iib |
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