st485ab STMicroelectronics, st485ab Datasheet - Page 7

• Manufacturer Part Number: st485ab
• Description: Very High Speed Low Power Rs-485/rs-422 Transceiver
• Manufacturer: STMicroelectronics

Table 9.
Table 10.
Symbol
Symbol
t
t
t
SK(EN)
SK(DS)
ΔV
R
I
SKEW
I
t
t
V
V
t
t
t
t
t
t
V
OZR
OSR
D
PLH
PHL
TLH
THL
PZH
PHZ
PZL
PLZ
RIN
OH
TH
OL
TH
R
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
3-State (High Impedance) Output
Current at Receiver
Receiver Input Resistance
Receiver Short-Circuit Current
Maximum data rate
Propagation delay input to output
Differential output delay skew
Rise or fall differential time
Output enable time
Output enable time
Output disable time
Output disable time
Synchronous driver operation a-b at
enable
Synchronous driver operation A-B
at disable
Receiver electrical characteristics (V
otherwise specified. Typical values are referred to T
Driver switching characteristics (V
specified. Typical values are referred to T
Parameter
Parameter
C
C
V
V
I
I
V
V
V
Jitter < 5%
R
(Figure
R
(Figure
R
(Figure
C
C
OUT
OUT
CM
CM
O
CM
O
L
L
L
L
L
L
L
= 54 Ω , C
= 54Ω , C
= 54Ω , C
= 50 pF, S1 Closed
= 50 pF, S2 Closed
= 15 pF, S2 Closed
= 15 pF, S1 Closed
= 0.4 V to 2.4 V
= 0 V to V
= -7 V to 12 V
= 0 V
= -7 V to 12 V
= -4 mA, V
= 4 mA, V
CC
8.)
6.)
6.)
Test conditions
Test conditions
CC
= 4.5 V to 5.5 V, T
L1
L1
A
L1
=C
=C
= 4.5 V to 5.5 V, T
CC
= 25°C, V
=C
ID
ID
L2
L2
L2
= -200 mV
= 200 mV
=50 pF,
=50 pF,
=50 pF,
A
CC
= 25°C, V
= 5 V) (See
A
= -40 to 85°C, unless otherwise
A
= -40 to 85°C, unless
CC
Min.
Min.
-0.2
3.5
= 5 V)
12
30
7
Note:
Typ.
Typ.
4.7
0.2
0.5
(Note:
70
50
18
24
8
4
1,
Note
Max.
Max.
1)
0.2
0.4
± 1
95
30
12
30
30
30
30
2
2
6
3)
Mbps
Unit
Unit
mV
mA
KΩ
μA
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
V
V
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