DS96172 Datasheet, PDF (3/6 Pages) National Semiconductor (TI) – RS-485/RS-422 Quad Differential Line Drivers

Switching Characteristics (Continued)
V_CC = 5V, T_A = 25˚C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t_PHZ
Output Disable Time from High Level
R_L = 110Ω, Figure 4
t_PLZ
Output Disable Time from Low Level
R_L = 110Ω, Figure 5
25
35
ns
30
45
ns
Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation.
Note 3: Unless otherwise specified min/max limits apply across the 0˚C to +70˚C range for the DS96172/DS96174. All typicals are given for V_CC = 5V and T_A = 25˚C.
Note 4: All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground unless otherwise specified.
Note 5: ∆ |V_OD| and ∆|V_OC| are the changes in magnitude of V_OD and V_OC respectively, that occur when the input is changed from a high level to a low level.
Note 6: In EIA Standards RS-422A and RS-485, V_OC, which is the average of the two output voltages with respect to ground, is called output offset voltage, V_OS.
Note 7: Only one output at a time should be shorted.
Parameter Measurement Information
DS009626-4
FIGURE 1. Differential and Common Mode Output Voltage
DS009626-5
FIGURE 2. Differential Output Delay and Transition Times
DS009626-6
DS009626-7
FIGURE 3. Propagation Delay Times
DS009626-8
3
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