Datasheet

Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
4 Maxim Integrated
MAX481/MAX483/MAX485/
MAX487–MAX491/MAX1487
SWITCHING CHARACTERISTICS—MAX483, MAX487/MAX488/MAX489
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (continued)
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
300 1000
Figures 7 and 9, C
L
= 100pF, S2 closed
Figures 7 and 9, C
L
= 100pF, S1 closed
Figures 5 and 11, C
L
= 15pF, S2 closed,
A - B = 2V
CONDITIONS
ns40 100t
ZH(SHDN)
Driver Enable from Shutdown to
Output High (MAX481)
ns
Figures 5 and 11, C
L
= 15pF, S1 closed,
B - A = 2V
t
ZL(SHDN)
Receiver Enable from Shutdown
to Output Low (MAX481)
ns40 100t
ZL(SHDN)
Driver Enable from Shutdown to
Output Low (MAX481)
ns300 1000t
ZH(SHDN)
Receiver Enable from Shutdown
to Output High (MAX481)
UNITSMIN TYP MAXSYMBOLPARAMETER
t
PLH
t
SKEW
Figures 6 and 8, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
t
PHL
Figures 6 and 8, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Driver Input to Output
Driver Output Skew to Output ns100 800
ns
ns2000
MAX483/MAX487, Figures 7 and 9,
C
L
= 100pF, S2 closed
t
ZH(SHDN)
Driver Enable from Shutdown to
Output High
250 2000
ns2500
MAX483/MAX487, Figures 5 and 11,
C
L
= 15pF, S1 closed
t
ZL(SHDN)
Receiver Enable from Shutdown
to Output Low
ns2500
MAX483/MAX487, Figures 5 and 11,
C
L
= 15pF, S2 closed
t
ZH(SHDN)
Receiver Enable from Shutdown
to Output High
ns2000
MAX483/MAX487, Figures 7 and 9,
C
L
= 100pF, S1 closed
t
ZL(SHDN)
Driver Enable from Shutdown to
Output Low
ns50 200 600MAX483/MAX487 (Note 5) t
SHDN
Time to Shutdown
t
PHL
t
PLH
, t
PHL
< 50% of data period
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 7 and 9, C
L
= 15pF, S2 closed
Figures 6 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 7 and 9, C
L
= 15pF, S1 closed
Figures 7 and 9, C
L
= 100pF, S1 closed
Figures 7 and 9, C
L
= 100pF, S2 closed
CONDITIONS
kbps250f
MAX
250 800 2000
Maximum Data Rate
ns20 50t
HZ
Receiver Disable Time from High
ns
250 800 2000
20 50t
LZ
Receiver Disable Time from Low
ns20 50t
ZH
Receiver Enable to Output High
ns20 50t
ZL
Receiver Enable to Output Low
ns
ns
100
300 3000t
HZ
t
SKD
Driver Disable Time from High
I t
PLH
- t
PHL
I Differential
Receiver Skew
Figures 6 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
ns300 3000t
LZ
Driver Disable Time from Low
ns250 2000t
ZL
Driver Enable to Output Low
ns
Figures 6 and 8, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
ns250 2000t
R
, t
F
250 2000
Driver Rise or Fall Time
ns
t
PLH
Receiver Input to Output
250 2000t
ZH
Driver Enable to Output High
UNITSMIN TYP MAXSYMBOLPARAMETER