Datasheet

MAX3480A/MAX3480B
Complete, Isolated, 3.3V
RS-485/RS-422 Data Interface
4 _______________________________________________________________________________________
Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to
logic-side ground (GND1, GND2), unless otherwise specified.
Note 2: For DE
´
and DI
´
pin descriptions, see Detailed Block Diagram and Typical Application Circuit (Figure 1 for
MAX3480A/MAX3480B).
Note 3: Shutdown supply current is the current at V
CC1
when shutdown is enabled.
Note 4: Applies to peak current. See
Typical Operating Characteristics and Applications Information .
SWITCHING CHARACTERISTICS—MAX3480B
(V
CC
= V
CC1
= V
CC2
= V
CC4
=V
CC5
= 3.0V to 3.6V, FS = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
V
CC
= V
CC1
= V
CC2
= V
CC4
= V
CC5
= 3.3V and T
A
= +25°C.)
ns
PARAMETER SYMBOL MIN TYP MAX UNITS

t
PLH
- t
PHL
Differential
Receiver Skew
t
PLH
1.0 2.0
Driver Input to Output
Propagation Delay
µs
Driver Output Skew t
SKEW
100 800 ns
Driver Rise or Fall Time t
R
, t
F
1.0 2.0 µs
Driver Enable to Output High t
ZH
50 100 µs
Driver Enable to Output Low t
ZL
50 100 µs
Driver Disable Time from Low t
LZ
13 50 µs
CONDITIONS
Figures 4, 6; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 5, 7; C
L
= 100pF, S2 closed
Figures 5, 7; C
L
= 100pF, S1 closed
Figures 4, 6; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 4, 6; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 5, 7; C
L
= 15pF, S1 closed
Driver Disable Time from High t
HZ
13 50 µsFigures 5, 7; C
L
= 15pF, S2 closed
t
SKD
t
PLH
0.8 2.0
Receiver Input to Output
Propagation Delay
t
PHL
0.8 2.0
µs
Figures 4, 8; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
50
Figures 4, 8; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Maximum Data Rate f
MAX
0.25 Mbpst
PLH
, t
PHL
< 50% of data period
t
PHL
1.0 2.0