DS481_14 Datasheet, PDF (5/17 Pages) Texas Instruments – Low Power RS-485/RS-422 Multipoint Transceiver with Sleep Mode

DS481
www.ti.com
SNLS131B – JULY 2000 – REVISED MARCH 2013
Switching Characteristics
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified ^{(1) (2) (3)}
Parameter
Test Conditions
Min
Typ
t_PLHD
t_PHLD
t_SKEW
t_r
t_f
t_ZH
t_ZL
t_LZ
t_HZ
t_PSH
Driver Differential Propagation Delay—Low to High
Driver Differential Propagation Delay—High to Low
Differential Skew |t_PHLD − t_PLHD|
Driver Rise Time
Driver Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output Low
Driver Disable from Output High
Driver Enable from Sleep
Mode to Output High
R_L = 54Ω, C_L = 100 pF
C_L = 100 pF
C_L = 100 pF
C_L = 15 pF
C_L = 15 pF
C_L = 100 pF
(4)_{(Figure 6, Figure 7)}
10
40
10
39
0
1
3
25
3
25
50
65
80
80
70
98
t_PSL
Driver Enable from Sleep
Mode to Output Low
C_L = 100 pF
(4)_{(Figure 8 ,Figure 9)}
70
98
t_PLHD
t_PHLD
t_SKEW
t_ZH
t_ZL
t_LZ
t_HZ
t_PSH
Receiver Differential Propagation Delay—Low to High C_L = 15 pF (RO)
Receiver Differential Propagation Delay—High to Low
Differential Skew |t_PHLD − t_PLHD|
Receiver Enable to Output High
Receiver Enable to Output Low
C_L = 15 pF
Receiver Disable from Output Low
Receiver Disable from Output High
Receiver Enable from Sleep
Mode to Output High
C_L = 15 pF
(4)_{(Figure 12, Figure 14)}
30
190
30
210
0
20
45
40
50
55
70
97
t_PSL
t_SLEEP
Receiver Enable from Sleep
Mode to Output Low
Time to Sleep (Device)
f_max
Maximum Data Rate
C_L = 15 pF
(4)_{(Figure 12, Figure 13)}
DE = L and RE ⁽⁵⁾ = H
(Figure 15)
(6)
70
95
50
2.0
Max
Units
80
ns
80
ns
10
ns
50
ns
50
ns
200
ns
200
ns
200
ns
200
ns
250
ns
250
ns
400
ns
400
ns
50
ns
150
ns
150
ns
150
ns
150
ns
250
ns
250
ns
600
ns
Mbps
(1) All typicals are given for: V_CC = +5.0V, T_A = +25°C.
(2) f = 1 MHz, t_r and t_f ≤ 6 ns, Z_O = 50Ω.
(3) C_L includes jig and probe capacitance.
(4) For enable from sleep mode delays DE = L and RE = H for greater than 600 ns prior to test (device is in sleep mode). RE is Non
Terminated, Open Input only.
(5) Non Terminated, Open Input only
(6) f_max is the guaranteed data rate for 50 ft of twisted pair cable. f _max may be conservatively determined from the ratio of driver transition
time (t_r) to the data rate unit interval (1/f_max). Using a 10% ratio yields f_max = (0.1)/50 ns = 2.0 Mb/s. Higher data rates may be supported
by allowing larger ratios.
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