MAX3430
±80V Fault-Protected, Fail-Safe,
1/4-Unit Load, +3.3V RS-485 Transceiver
4 _______________________________________________________________________________________
DRIVER SWITCHING CHARACTERISTICS
(V
CC
= +3.3V ±10%, 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 CONDITIONS MIN TYP MAX UNITS
t
DPLH
700 1500
Driver Propagation Delay
t
DPHL
Figures 2 and 3, R
L
= 54Ω, C
L
= 50pF
700 1500
ns
Driver Differential Output Rise or
Fall Time
t
DR
t
DF
Figures 2 and 3, R
L
= 54Ω, C
L
= 50pF 250 1200 ns
Differential Driver Output Skew,
|t
DPLH
- t
DPHL
|
t
DSKEW
Figures 2 and 3, R
L
= 54Ω, C
L
= 50pF 150 200 ns
Maximum Data Rate 250 kbps
Driver Enable to Output Low t
DZL
Figure 4, C
L
= 50pF 5200 ns
Driver Disable Time from Output
Low
t
DLZ
Figure 4, C
L
= 50pF 1000 ns
Driver Output Enable Time from
Shutdown
t
DZL
SHDN
Figure 4, C
L
= 50pF 8000 ns
Driver Enable to Output High t
DZH
Figure 5, C
L
= 50pF 5200 ns
Driver Disable Time from Output
High
t
DHZ
Figure 5, C
L
= 50pF 1000 ns
Driver Output Enable Time from
Shutdown
t
DZH
SHDN
Figure 5, C
L
= 50pF 8000 ns
Driver Time to Shutdown t
SHDN
1000 ns
RECEIVER SWITCHING CHARACTERISTICS
(V
CC
= +3.3V ±10%, 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 CONDITIONS MIN TYP MAX UNITS
t
RPLH
120
Receiver Propagation Delay
t
RPHL
Figure 6, C
L
= 20pF, V
ID
= 2V, V
CM
= 0
120
ns
Receiver Output Skew,
|t
RPLH
- t
RPHL
|
t
SKEW
Figure 6, C
L
= 20pF 40 ns
Receiver Enable to Output Low t
RZL
Figure 7, R = 1kΩ, C
L
= 20pF 80 ns
Receiver Enable to Output High t
RZH
Figure 7, R = 1kΩ, C
L
= 20pF 80 ns
Receiver Disable Time from Low t
RLZ
Figure 7, R = 1kΩ, C
L
= 20pF 80 ns
Receiver Disable Time form High t
RHZ
Figure 7, R = 1kΩ , C
L
= 20pF 80 ns
Receiver Output Enable Time
from Shutdown
t
RZH
SHND
,
t
RZL
SHND
Figure 7, R = 1kΩ, C
L
= 20pF 5000 ns
Receiver Time to Shutdown t
SHDN
1000 ns
Note 2: ∆V
OD
and ∆V
OC
are the changes in V
OD
and V
OC
, respectively, when the DI input changes state.
Note 3: The short-circuit output current applies to peak current just prior to foldback current limiting; the short-circuit foldback output
current applies during current limiting to allow a recovery from bus contention.
