DocID025158 Rev 2 7/18
ST4485EB Electrical characteristics
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Table 10. Receiver electrical characteristics (V
CC
= 3 V to 3.6 V, T
A
= -40 to 105 °C, unless
otherwise specified. Typical values are referred to T
A
= 25 °C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
TH
Receiver differential
threshold voltage
V
CM
= -7 V to 12 V, DE = 0 -0.2 0.2 V
V
TH
Receiver input hysteresis V
CM
= 0 V 70 V
V
OH
Receiver output high
voltage
I
OUT
= -4 mA, V
ID
= 200 mV
(Figure 8 and Figure 9)
2V
V
OL
Receiver output low
voltage
I
OUT
= 4 mA, V
ID
= -200 mV, (Figure 3)0.4V
I
OZR
3-state (high impedance)
output current at receiver
V
CC
= 3.6 V, V
O
= 0 V to V
CC
1µA
R
RIN
Receiver input resistance V
CM
= -7 V to 12 V 24 k
I
OSR
Receiver short-circuit
current
V
RO
= 0 V to V
CC
760mA
Table 11. Driver switching characteristics (V
CC
= 3 V to 3.6 V, T
A
= -40 to 105 °C, unless otherwise
specified. Typical values are referred to T
A
= 25 °C)
(1)
Symbol Parameter Test conditions Min. Typ. Max. Unit
D
R
Maximum data rate 20 Mbps
t
DD
Differential output delay
R
L
= 60 , C
L
= 15 pF, (Figure 4 and
Figure 5)
18 30 ns
t
TD
Differential output
transition time
R
L
= 60 , C
L
= 15 pF, (Figure 4 and
Figure 5)
12 20 ns
t
PLH
t
PHL
Propagation delay
R
L
= 27 , C
L
= 15 pF, (Figure 8 and
Figure 9)
18 30 ns
t
PDS
|t
PLH -
t
PHL
| Propagation
delay skew
(2)
R
L
= 27 , C
L
= 15 pF, (Figure 8 and
Figure 9)
25ns
t
PZL
Output enable time R
L
= 110 , (Figure 10 and Figure 11)1935ns
t
PZH
Output enable time R
L
= 110 , (Figure 6 and Figure 7)3050ns
t
PHZ
Output disable time R
L
= 110 , (Figure 6 and Figure 7)1935ns
t
PLZ
Output disable time R
L
= 110 (Figure 10 and Figure 11)3050ns
t
SKEW
Differential output delay
skew
13ns
t
ZH(SHDN)
Driver enable from
shutdown to output high
30 50 ns
t
ZL(SHDN)
Driver enable from
shutdown to output low
19 35 ns
1. The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80 ns, the part
are guaranteed not to enter shutdown. If the inputs are in this state for at least 300 ns, the parts are guaranteed to have
entered shutdown.
2. Measured on |t
PLH
(A) - t
PHL
(A)| and |t
PLH
(B) - t
PHL
(B)|.
