Datasheet

ST485EB - ST485EC - ST485EX Electrical characteristics
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V
CC
= 5 V ± 5 %, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values are referred
to T
A
= 25 °C
I
OSD1
Driver short-circuit current,
V
O
=High
V
O
= -7 to 12 V
(3)
35 250 mA
I
OSD2
Driver short-circuit current,
V
O
=Low
V
O
= -7 to 12 V
(3)
35 250 mA
I
OSR
Receiver short-circuit current V
O
= 0 V to V
CC
795mA
1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground
unless specified.
2. Supply current specification is valid for loaded transmitters when V
DE
= 0 V
3. Applies to peak current. See typical Operating Characteristics.
Table 7. DC electrical characteristics (continued)
Symbol Parameter Test conditions
(1)
Min. Typ. Max. Unit
Table 8. Driver switching characteristics
Symbol Parameter Test conditions
(1)
Min. Typ. Max. Unit
t
PLH
t
PHL
Propagation delay input to
output
R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(See Figure 4 and Figure 6)
25 45 ns
t
SK
Output skew to output
R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(See Figure 4 and Figure 6)
25ns
t
TLH
t
THL
Rise or fall time
R
DIFF
= 54 Ω, C
L1
= C
L2
= 100 pF
(See Figure 4 and Figure 6)
15 40 ns
t
PZH
Output enable time
C
L
= 100 pF, S2 = Closed
(See Figure 5 and Figure 7)
35 50 ns
t
PZL
Output enable time
C
L
= 100 pF, S1 = Closed
(See Figure 5 and Figure 7)
25 40 ns
t
PLZ
Output disable time
C
L
= 15 pF, S1 = Closed
(See Figure 5 and Figure 7)
25 40 ns
t
PHZ
Output disable time
C
L
= 15 pF, S2 = Closed
(See Figure 5 and Figure 7)
35 50 ns
1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground
unless specified.