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ST491A Electrical characteristics
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Table 7. Receiver electrical characteristics
(V
CC
= 4.5V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified. Typical values are
referred to T
A
=25°C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
IN
Input current (A, B)
Other input = 0V
V
CC
= 0 or 5.25V
V
IN
=12V 0.5 1
mA
V
IN
=-7V -0.35 -0.8
V
TH
Receiver differential threshold
voltage
V
CM
= -7V to 12V -0.2 0.2 V
ΔV
TH
Receiver input hysteresis V
CM
= 0V 70 mV
V
OH
Receiver output high voltage I
OUT
= -8mA, V
ID
= 200mV 3.5 4.7 V
V
OL
Receiver output low voltage I
OUT
= 8mA, V
ID
= -200mV 0.3 0.5 V
R
RIN
Receiver input resistance V
CM
= -7V to 12V 12 24 KΩ
Table 8. Driver switching characteristics
(V
CC
= 4.5V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified. Typical values are
referred to T
A
=25°C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
D
R
Maximum data rate Jitter <5% 25 50 Mbps
t
PLH
t
PHL
Propagation delay input
to output
R
L
= 54Ω, C
L1
=C
L2
=50pF, (Figure 1.)1016ns
t
SKEW
Differential output delay
skew
R
L
= 54Ω, C
L1
=C
L2
=50pF, (Figure 1.)13ns
t
TLH
t
THL
Rise or fall differential
time
R
L
= 54Ω, C
L1
=C
L2
=50pF, (Figure 1.)812ns
t
PZL
Output enable time C
L
= 50pF, S1 Closed 14 25 ns
t
PZH
Output enable time C
L
= 50pF, S2 Closed 14 25 ns
t
PHZ
Output disable time C
L
= 15pF, S2 Closed 10 25 ns
t
PLZ
Output disable time C
L
= 15pF, S1 Closed 16 25 ns
