MAX1480A_05 Datasheet, PDF (3/21 Pages) Maxim Integrated Products – Complete, Isolated RS-485/RS-422 Data Interface

Complete, Isolated RS-485/RS-422
Data Interface
ELECTRICAL CHARACTERISTICS (continued)
(V_{CC_} = 5V ±10%, V_FS = V_{CC_}, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at V_{CC_} = 5V and T_A = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Differential Driver Output
(With Load)
V_OD2
R = 50Ω (RS-422)
R = 27Ω (RS-485), Figure 4
2
1.5
Change in Magnitude of
Differential Output Voltage for
Complementary Output States
∆V_OD
R = 27Ω or 50Ω,
Figure 4
Differential
Common mode
V
5.0
0.3
V
0.3
Driver Common-Mode Output
Voltage
V_OC R = 27Ω or 50Ω, Figure 4
4
V
Input Current (A, B)
ISO I_IN
DE´ = 0V,
V_{CC_} = 0V
or 5.5V
V_IN = 12V
V_IN = -7V
MAX1480A/B/C
MAX1490A/B
MAX1480A/B/C
MAX1490A/B
1
0.25
mA
0.8
0.2
MAX1480A/B/C
48
Receiver Input Resistance
R_IN
-7V ≤ V_CM ≤ 12V
MAX1490A/B
12
kΩ
Receiver Differential Threshold
Voltage
V_TH
-7V ≤ V_CM ≤ 12V
-0.2
+0.2
V
Receiver Input Hysteresis
Receiver Output/Receiver Output
Low Voltage
∆V_TH
V_OL
V_CM = 0V
Using resistor values listed in
Tables 1 and 2
70
mV
0.4
V
Receiver Output/Receiver Output
High Current
I_OH
V_OUT = 5.5V
250
µA
Driver Short-Circuit Current
ISO I_OSD -7V ≤ V_O ≤ 12V (Note 4)
100
mA
SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A
(V_{CC_} = 5V ±10%, FS = V_{CC_}, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at V_{CC_} = 5V and TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP MAX
Driver Input to Output
Propagation Delay
t_PLH
Figures 5 and 7, R_DIFF = 54Ω, C_L1 = C_L2
t_PHL
= 100pF
100 275
100 275
Driver Output Skew
t_SKEW
Figures 5 and 7, R_DIFF = 54Ω, C_L1 = C_L2
= 100pF
25
90
Driver Rise or Fall Time
t_R, t_F
Figures 5 and 7, R_DIFF = 54Ω, C_L1 = C_L2
= 100pF
15
40
Driver Enable to Output High
(MAX1480A Only)
t_ZH
Figures 6 and 8, C_L = 100pF, S2 closed
0.2
1.5
Driver Enable to Output Low
(MAX1480A Only)
t_ZL
Figures 6 and 8, C_L = 100pF, S1 closed
0.2
1.5
Driver Disable Time from Low
(MAX1480A Only)
t_LZ
Figures 6 and 8, C_L = 15pF, S1 closed
0.2
1.5
Driver Disable Time from High
(MAX1480A Only)
t_HZ
Figures 6 and 8, C_L = 15pF, S2 closed
0.2
1.5
Receiver Input to Output
Propagation Delay
t_PLH
Figures 5 and 10, R_DIFF = 54Ω, C_L1 = C_L2
t_PHL
= 100pF
100 225
100 225
UNITS
ns
ns
ns
µs
µs
µs
µs
ns
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