MAX1481/MAX1484/MAX1485/MAX1486
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
4 _______________________________________________________________________________________
SWITCHING CHARACTERISTICS (MAX1481/MAX1485) (continued)
(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.)
Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground unless otherwise noted.
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: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during
current limiting.
Note 4: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the MAX1481
is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the MAX1481 is guaranteed to
have entered shutdown.
C
L
= 15pF, S1 closed, Figures 8 and 10
C
L
= 100pF, S2 closed, Figures 8 and 10
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF,
Figures 7 and 9
C
L
= 100pF, S1 closed, Figures 8 and 10
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF,
Figures 7 and 9
ns200t
DLZ
C
L
= 100pF, S2 closed, Figures 6 and 12
Driver Disable Time from Low
C
L
= 100pF, S1 closed, Figures 6 and 12
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF,
Figures 7 and 9
ns3000t
DZH
Driver Enable to Output High
ns3000
CONDITIONS
t
DZL
Driver Enable to Output Low
kbps250f
MAX
Maximum Data Rate
C
L
= 15pF, S2 closed, Figures 8 and 10
C
L
= 100pF, S2 closed, Figures 6 and 12
C
L
= 100pF, S1 closed, Figures 6 and 12
ns10 200t
DSKEW
Driver Output Skew
| t
DPLH
- t
DPHL
|
Figures 11 and 13
ns
ns20 50t
RZH
Receiver Enable to Output High
ns20 50t
RZL
Receiver Enable to Output Low
ns200t
DHZ
Driver Disable Time from High
ns
ns20 50t
RHZ
Receiver Disable Time from High
90 150
t
RPLH
,
t
RPHL
Receiver Input to Output
250 1000t
DR
, t
DF
Driver Rise or Fall Time
ns20 50t
RLZ
Receiver Disable Time from Low
Figures 11 and 13 ns15t
RSKD
| t
RPLH
- t
RPHL
| Differential
Receiver Skew
600 1000t
DPLH
ns
600 1000t
DPHL
Driver Input to Output
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX1481 only (Note 4) ns50 200 600t
SHDN
Time to Shutdown
MAX1481 only, C
L
= 15pF, S2 closed,
Figures 8 and 10
ns3000t
DZH(SHDN)
Driver Enable from Shutdown to
Output High
MAX1481 only, C
L
= 15pF, S1 closed,
Figures 8 and 10
ns3000t
DZL(SHDN)
Driver Enable from Shutdown to
Output Low
MAX1481 only, C
L
= 100pF, S1 closed,
Figures 6 and 12
ns1000t
RZL(SHDN)
Receiver Enable from Shutdown
to Output Low
MAX1481 only, C
L
= 100pF, S2 closed,
Figures 6 and 12
ns500t
RZH(SHDN)
Receiver Enable from Shutdown
to Output High
