DS96177 Datasheet, PDF (3/8 Pages) National Semiconductor (TI) – RS-485/RS-422 Differential Bus Repeater

Electrical Characteristics (Notes 3, 4) (Continued)
Over recommended temperature, common mode input voltage, and supply voltage ranges, unless otherwise specified
Symbol
Parameter
Conditions
Min Typ Max
RECEIVER SECTION
V_IC
Enable Input Clamp Voltage
V_OH
High Level Output Voltage
V_OL
Low Level Output Voltage
I_OZ
High-Impedance State Output
I_I
Line Input Current (Note 9)
I_IH
Enable Input Current HIGH
I_IL
Enable Input Current LOW
R_I
Input Resistance
I_OS
Short Circuit Output Current
I_CC
Supply Current (Total Package)
I_I = −18 mA
−1.5
V_ID = 200 mV, I_OH = −400 µA, Figure 3 2.7
V_ID = −200 mV,
I_OL = 8.0 mA
0.45
Figure 3
I_OL = 16 mA
0.50
V_O = 0.4V
−360
V_O = 2.4V
20
Other Input = 0V
V_I = 12V
1.0
V_I = −7.0V
−0.8
V_IH = 2.7V
20
V_IL = 0.4V
−100
12
(Note 10)
−15
−85
No Load
Outputs Enabled
35
Outputs Disabled
40
Units
V
V
V
µA
mA
µA
µA
kΩ
mA
mA
Drive Switching Characteristics
V_CC = 5.0V, T_A = 25˚C
Symbol
Parameter
Conditions
t_DD
Differential Output Delay Time
t_TD
Differential Output Transition Time
t_PLH
Propagation Delay Time,
R_L = 60Ω, Figure 4
R_L = 60Ω, Figure 4
R_L = 27Ω, Figure 5
Low-to-High Level Output
t_PHL
Propagation Delay Time,
R_L = 27Ω, Figure 5
High-to-Low Level Output
t_PZH
Output Enable Time to High Level
R_L = 110Ω, Figure 6
t_PZL
Output Enable Time to Low Level
R_L = 110Ω, Figure 7
t_PHZ
Output Disable Time from High Level
R_L = 110Ω, Figure 6
t_PLZ
Output Disable Time from Low Level
R_L = 110Ω, Figure 7
Min Typ Max Units
15 25
ns
15 25
ns
12 20
ns
12 20
ns
25 45
ns
25 40
ns
20 25
ns
29 35
ns
Receiver Switching Characteristics
V_CC = 5.0V, T_A = 25˚C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t_PLH
Propagation Delay Time,
Low-to-High Level Output
t_PHL
Propagation Delay Time,
High-to-Low Level Output
V_ID = 0V to 3.0V,
C_L = 15 pF, Figure 8
16
25
ns
16
25
ns
t_PZH
Output Enable Time to High Level
C_L = 15 pF, Figure 9
t_PZL
Output Enable Time to Low Level
t_PHZ
Output Disable Time from High Level
C_L = 5.0 pF, Figure 9
t_PLZ
Output Disable Time from Low Level
15
22
ns
15
22
ns
14
30
ns
24
40
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 DS96177. 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, 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: The algebraic convention, when the less positive (more negative) limit is designated minimum, is used in this data sheet for common mode input voltage
and threshold voltage levels only.
3
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