MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
6 _______________________________________________________________________________________
SWITCHING CHARACTERISTICS—SRL = V
CC
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
250 720 1000
Receiver Enable from Shutdown
to Output Low
t
RZL(SHDN)
3500 nsFigures 2 and 8, C
L
= 100pF, S1 closed
t
DPHL
PARAMETER SYMBOL MIN TYP MAX UNITS
Driver Disable Time from Low t
DLZ
100 ns
Driver Enable to Output Low t
DZL
2500 ns
Driver Enable to Output High t
DZH
2500 ns
Maximum Data Rate f
MAX
500 kbps
Driver Disable Time from High t
DHZ
100 ns
Receiver Input to Output
t
RPLH
,
t
RPHL
127 200 ns
|
t
RPLH
- t
RPHL
|
Differential
Receiver Skew
t
RSKD
3±30ns
Receiver Enable to Output Low t
RZL
20 50 ns
Driver Output Skew
|
t
DPLH
- t
DPHL
|
Driver Input to Output
t
DPLH
250 720 1000
ns
t
DSKEW
-3 ±100 ns
Driver Rise or Fall Time t
DR,
t
DF
200 530 950 ns
Receiver Enable to Output High t
RZH
20 50 ns
Receiver Disable Time from Low t
RLZ
20 50 ns
Receiver Disable Time from
High
t
RHZ
20 50 ns
Time to Shutdown t
SHDN
50 200 600 ns
Driver Enable from Shutdown to
Output High
t
DZH(SHDN)
4500 ns
Driver Enable from Shutdown to
Output Low
t
DZL(SHDN)
4500 ns
Receiver Enable from Shutdown
to Output High
t
RZH(SHDN)
3500 ns
CONDITIONS
Figures 2 and 8, C
L
= 100pF, S2 closed
Figures 4 and 6, C
L
= 15pF, S1 closed
Figures 2 and 8, C
L
= 100pF, S1 closed
Figures 4 and 6, C
L
= 100pF, S1 closed
Figures 4 and 6, C
L
= 100pF, S2 closed
Figures 4 and 6, C
L
= 15pF, S2 closed
Figures 7 and 9,
|
V
ID
|
≥ 2.0V,
rise and fall time of V
ID
≤ 15ns
Figures 2 and 8, C
L
= 100pF, S2 closed
(Note 5)
Figures 7 and 9,
|
V
ID
|
≥ 2.0V,
rise and fall time of V
ID
≤ 15ns
Figures 2 and 8, C
L
= 100pF, S1 closed
Figures 4 and 6, C
L
= 15pF, S2 closed
Figures 4 and 6, C
L
= 15pF, S1 closed
Figures 2 and 8, C
L
= 100pF, S2 closed
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 3 and 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
