Datasheet
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
Maxim Integrated 3
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
mA
7950V ≤ V
O
≤ V
CC
I
OSR
Receiver Short-Circuit Current
mA35 250-7V ≤ V
O
≤12V (Note 4)I
OSD2
Driver Short-Circuit Current,
V
O
= Low
mA35 250-7V ≤ V
O
≤12V (Note 4)I
OSD1
Driver Short-Circuit Current,
V
O
= High
MAX1487,
RE = 0V or V
CC
250 400
350 650
ns
10 30 60t
PHL
Driver Rise or Fall Time
Figures 6 and 8, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
ns
MAX490M, MAX491M
MAX490C/E, MAX491C/E 20 90 150
MAX481, MAX485, MAX1487
MAX490M, MAX491M
MAX490C/E, MAX491C/E
MAX481, MAX485, MAX1487
Figures 6 and 8, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
MAX481 (Note 5)
Figures 5 and 11, C
RL
= 15pF, S2 closed
Figures 5 and 11, C
RL
= 15pF, S1 closed
Figures 5 and 11, C
RL
= 15pF, S2 closed
Figures 5 and 11, C
RL
= 15pF, S1 closed
Figures 6 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 6 and 8,
R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 6 and 10,
R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
CONDITIONS
ns
510t
SKEW
ns50 200 600t
SHDN
Time to Shutdown
Mbps2.5f
MAX
Maximum Data Rate
ns20 50t
HZ
Receiver Disable Time from High
ns
10 30 60t
PLH
20 50t
LZ
Receiver Disable Time from Low
ns20 50t
ZH
Driver Input to Output
Receiver Enable to Output High
ns20 50t
ZL
Receiver Enable to Output Low
20 90 200
ns
ns
13
40 70t
HZ
t
SKD
Driver Disable Time from High
| t
PLH
- t
PHL
| Differential
Receiver Skew
ns40 70t
LZ
Driver Disable Time from Low
ns
40 70t
ZL
Driver Enable to Output Low
31540
ns
51525
ns
31540
t
R
, t
F
20 90 200
Driver Output Skew to Output
t
PLH
, t
PHL
Receiver Input to Output
40 70t
ZH
Driver Enable to Output High
UNITSMIN TYP MAXSYMBOLPARAMETER
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
230 400
300 500
MAX481/MAX485,
RE = 0V or V
CC
500 900
MAX490/MAX491,
DE, DI, RE = 0V or V
CC
300 500
MAX488/MAX489,
DE, DI, RE = 0V or V
CC
120 250
DE = V
CC
300 500DE = 0V
DE = V
CC
DE = 0V
µA
MAX481/483/487, DE = 0V, RE = V
CC
0.1 10I
SHDN
Supply Current in Shutdown
120 250
I
CC
No-Load Supply Current
(Note 3)
DE = 5V
DE = 0V
MAX483
MAX487
MAX483/MAX487,
RE = 0V or V
CC
Figures 7 and 9, C
L
= 100pF, S2 closed
Figures 7 and 9, C
L
= 100pF, S1 closed
Figures 7 and 9, C
L
= 15pF, S1 closed
Figures 7 and 9, C
L
= 15pF, S2 closed
µA