Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (continued)
(V
CC
= 5V 5ꢀ, T = T
to T
, unless otherwise noted.) (Notes 1, 2)
MAX
A
MIN
PARAMETER
SYMBOL
CONDITIONS
Figures 7 and 9, C = 100pF, S2 closed
MIN
TYP
MAX
UNITS
Driver Enable from Shutdown to
Output High (MAX481)
t
t
t
t
40
100
ns
ZH(SHDN)
ZL(SHDN)
ZH(SHDN)
ZL(SHDN)
L
Driver Enable from Shutdown to
Output Low (MAX481)
Figures 7 and 9, C = 100pF, S1 closed
40
100
1000
1000
ns
ns
ns
L
Receiver Enable from Shutdown
to Output High (MAX481)
Figures 5 and 11, C = 15pF, S2 closed,
L
A - B = 2V
300
300
Receiver Enable from Shutdown
to Output Low (MAX481)
Figures 5 and 11, C = 15pF, S1 closed,
L
B - A = 2V
SWITCHING CHARACTERISTICS—MAX483, MAX487/MAX488/MAX489
(V
CC
= 5V 5ꢀ, T = T
to T
, unless otherwise noted.) (Notes 1, 2)
MAX
A
MIN
PARAMETER
Driver Input to Output
SYMBOL
CONDITIONS
MIN
250
250
TYP
800
800
MAX
2000
2000
UNITS
t
t
PLH
PHL
Figures 6 and 8, R
= 54Ω,
= 54Ω,
= 54Ω,
DIFF
ns
C
= C = 100pF
L1
L2
Figures 6 and 8, R
DIFF
Driver Output Skew to Output
Driver Rise or Fall Time
t
100
800
ns
ns
SKEW
C
= C = 100pF
L1
L2
Figures 6 and 8, R
DIFF
t , t
R
250
2000
F
C
= C = 100pF
L1
L2
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
t
Figures 7 and 9, C = 100pF, S2 closed
250
250
300
300
250
250
2000
2000
3000
3000
2000
2000
ns
ns
ns
ns
ZH
L
t
Figures 7 and 9, C = 100pF, S1 closed
L
ZL
LZ
HZ
t
Figures 7 and 9, C = 15pF, S1 closed
L
Driver Disable Time from High
t
Figures 7 and 9, C = 15pF, S2 closed
L
t
t
PLH
PHL
Figures 6 and 10, R
= 54Ω,
DIFF
Receiver Input to Output
ns
ns
C
= C = 100pF
L1
L2
Figures 6 and 10, R
= C = 100pF
= 54Ω,
I t
- tPHL I Differential
DIFF
PLH
t
100
SKD
C
L1
L2
Receiver Skew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
Receiver Disable Time from High
Maximum Data Rate
t
Figures 5 and 11, C = 15pF, S1 closed
20
20
20
20
50
50
50
50
ns
ns
ZL
RL
t
Figures 5 and 11, C = 15pF, S2 closed
RL
ZH
t
LZ
Figures 5 and 11, C = 15pF, S1 closed
ns
RL
t
Figures 5 and 11, C = 15pF, S2 closed
ns
HZ
RL
f
t
, t < 50ꢀ of data period
PLH PHL
250
50
kbps
ns
MAX
Time to Shutdown
t
MAX483/MAX487 (Note 5)
200
600
SHDN
Driver Enable from Shutdown to
Output High
MAX483/MAX487, Figures 7 and 9,
C = 100pF, S2 closed
L
t
t
2000
ns
ns
ns
ns
ZH(SHDN)
Driver Enable from Shutdown to
Output Low
MAX483/MAX487, Figures 7 and 9,
C = 100pF, S1 closed
L
t
2000
2500
2500
ZL(SHDN)
Receiver Enable from Shutdown
to Output High
MAX483/MAX487, Figures 5 and 11,
C = 15pF, S2 closed
L
ZH(SHDN)
Receiver Enable from Shutdown
to Output Low
MAX483/MAX487, Figures 5 and 11,
C = 15pF, S1 closed
L
t
ZL(SHDN)
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
