UM3487E Datasheet, PDF (4/14 Pages) Union Semiconductor, Inc. – ±15kV ESD-Protected, Fail-Safe, Hot-Swappable Auto Polarity Reversal RS-485 Transceivers

UM3487E
Switching Characteristics
(V_CC = +3.3V ±5%, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at V_CC = +3.3V
and T_A = +25°C.)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Maximum Data Rate
f_MAX
500
kbps
Driver Input-to-Output
t_DPLH
t_DPHL
Figures 3 and 7, R_DIFF = 54Ω, ^{50 100 200}
C_L1 = C_L2 = 100pF
50 100 200
ns
Driver Output Skew
| t_DPLH - t_DPHL |
t_DSKEW
Figures 3 and 7, R_DIFF = 54Ω,
C_L1 = C_L2 = 100pF
3 100 ns
Driver Rise or Fall Time t_DR, t_DF
Figures 3 and 7, R_DIFF = 54Ω,
C_L1 = C_L2 = 100pF
100
200
500
ns
Driver Enable to Output High t_DZH
Figures 4 and 8, C_L = 100pF,
S2 closed
100 2500 ns
Driver Enable to Output Low t_DZL
Driver Disable Time from
Low
t_DLZ
Driver Disable Time from
High
t_DHZ
Figures 4 and 8, C_L = 100pF,
S1 closed
Figures 4 and 8, C_L = 15pF,
S1 closed
Figures 4 and 8, C_L = 15pF,
S2 closed
100 2500 ns
50 100 ns
50 100 ns
Receiver Input to Output
Differential
Receiver Skew
| t_RPLH - t_RPHL |
Receiver Enable to Output
Low
t_RPLH,
t_RPHL
t_RSKD
t_RZL
| V_ID | ≥1.0V;
rise and fall time of V_ID≤15ns
Figures 6 and 9; | V_ID | ≥1.0V;
rise and fall time of V_ID≤15ns
Figures 5 and 10, C_L = 100pF,
S1 closed
100 200 ns
3
30
ns
20 200 ns
Receiver Enable to Output
High
t_RZH
Receiver Disable Time from
Low
t_RLZ
Figures 5 and 10, C_L = 100pF,
S2 closed
Figures 5 and 10, C_L = 100pF,
S1 closed
20 200 ns
20 200 ns
Receiver Disable Time from
High
t_RHZ
Figures 5 and 10, C_L = 100pF,
S2 closed
20 200 ns
Time to Shutdown
t_SHDN
(Note 4)
50 200 600 ns
Driver Enable from
Shutdown to Output High
t_DZH(SHDN)
Figures 4 and 8, C_L = 15pF,
S2 closed
4500 ns
Driver Enable from
Shutdown to Output Low
t_DZL(SHDN)
Figures 4 and 8, C_L = 15pF,
S1 closed
4500 ns
Receiver Enable from
Shutdown to Output High ^tRZH(SHDN)
Figures 5 and 10, C_L = 100pF,
S2 closed
3500 ns
Receiver Enable from
Shutdown to Output Low ^tRZL(SHDN)
Figures 5 and 10, C_L = 100pF,
S1 closed
3500 ns
Note 4: The device is put into shutdown by bringing /RE high and DE low. If the enable inputs are
in this state for less than 50ns, the device is guaranteed not to enter shutdown. If the enable inputs
are in this state for at least 600ns, the device is guaranteed to have entered shutdown.
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http://www.union-ic.com Rev.02 Jan.2014
4/14