DI
3V
0V
t
PLH
B
A
V
O
F = 1MHZ: t
r
< 10ns: t
f
< 10ns
1.5V
t
PHL
1.5V
1
2
V
O
t
SKEW
90%
10%
1
2
V
O
t
SKEW
V
O
–V
O
t
r
Figure 4. Driver Propagation Delays
V
DIFF
= V(A) – V(B)
90%
10%
t
f
AC PARAMETERS
V
CC
= 5V±5%; typicals at 25°C; 0°C
≤
T
A
≤
+70°C unless otherwise noted.
PARAMETER
PROPAGATION DELAY
Driver Input to Output
Low to High (t
PLH
)
High to Low (t
PHL
)
Driver Output to Output (t
SKEW
)
Driver Rise Time (t
R
)
SP486
SP487
Driver Fall Time (t
F
)
SP486
SP487
DRIVER ENABLE
To Output High
To Output Low
DRIVER DISABLE
From Output Low
From Output High
MIN.
TYP.
MAX.
UNIT
CONDITIONS
R
DIFF
= 54 Ohms, C
L1
= C
L2
=
100pF;
Figure 2
20
20
40
40
5
20
20
20
20
60
60
60
60
15
ns
ns
ns
10% to 90%
ns
ns
90% to 10%
ns
ns
110
115
ns
ns
C
L
= 100pF;
Figures 3 and 5
(S
2
closed)
C
L
= 100pF;
Figures 3 and 5
(S
1
closed)
C
L
= 15pF;
Figures 3 and 5
(S
1
closed)
C
L
= 15pF;
Figures 3 and 5
(S
2
closed)
60
60
130
130
ns
ns
SP486/487
Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
5
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