UM3491 Datasheet, PDF (4/14 Pages) Union Semiconductor, Inc. – +3.3V Low Power，±15kV ESD-Protected, Fail-Safe, RS-422 Transceivers in SOP14/DIP14

UM3491
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
Driver Input-to-Output
t_DPLH
Figures 5 and 7, R_DIFF = 54Ω, ¹⁰
30
t_DPHL
C_L1 = C_L2 = 100pF
10 30
60
60
ns
Driver Output Skew
| t_DPLH - t_DPHL |
t_DSKEW
Figures 5 and 7, R_DIFF = 54Ω,
C_L1 = C_L2 = 100pF
10 25 ns
Driver Rise or Fall Time
t_DR, t_DF
Figures 5 and 7, R_DIFF = 54Ω,
C_L1 = C_L2 = 100pF
5
15
30
ns
Maximum Data Rate
f_MAX
10 Mbps
Driver Enable to Output High t_DZH
Figures 6 and 8, C_L = 100pF,
S2 closed
40 70 ns
Driver Enable to Output Low t_DZL
Driver Disable Time from
Low
t_DLZ
Driver Disable Time from
High
t_DHZ
Figures 6 and 8, C_L = 100pF,
S1 closed
Figures 6 and 8, C_L = 15pF,
S1 closed
Figures 6 and 8, C_L = 15pF,
S2 closed
40 70 ns
40 70 ns
40 70 ns
Receiver Input to Output
t_RPLH,
t_RPHL
Figures 9 and 11; | V_ID | ≥2.0V; ₂₀
rise and fall time of V_ID≤15ns
100
180
ns
| t_RPLH - t_RPHL | Differential
Receiver Skew
t_RSKD
Figures 9 and 11; | V_ID | ≥2.0V;
rise and fall time of V_ID≤15ns
13
ns
Receiver Enable to Output
Low
t_RZL
Figures 4 and 10, C_L = 100pF,
S1 closed
40 100 ns
Receiver Enable to Output
High
t_RZH
Figures 4 and 10, C_L = 100pF,
S2 closed
Receiver Disable Time from
Low
t_RLZ
Figures 4 and 10, C_L = 100pF,
S1 closed
Receiver Disable Time from
High
t_RHZ
Figures 4 and 10, C_L = 100pF,
S2 closed
40 100 ns
40 100 ns
40 100 ns
Time to Shutdown
t_SHDN
(Note 4)
50 200 600 ns
Driver Enable from
Shutdown to Output High
Driver Enable from
Shutdown to Output Low
t_DZH(SHDN
)
t_DZL(SHDN)
Figures 6 and 8, C_L = 15pF,
S2 closed
Figures 6 and 8, C_L = 15pF,
S1 closed
40 200 ns
40 200 ns
Receiver Enable from
Shutdown- to-Output High
t_RZH(SHDN)
Figures 4 and 10, C_L = 100pF,
S2 closed
150 500 ns
Receiver Enable from
Shutdown- to-Output Low
t_RZL(SHDN)
Figures 4 and 10, C_L = 100pF,
S1 closed
150 500 ns
_______
Note 4: The device is put into shutdown by bringing R E 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 Jun.2012
4/14