ST485A STMicroelectronics, ST485A Datasheet - Page 7

• Manufacturer Part Number: ST485A
• Description: Very high speed low power RS-485/RS-422 transceiver
• Manufacturer: STMicroelectronics

ST485A
4.3
Table 8.
4.4
Table 9.
Symbol
Symbol
t
t
t
SK(EN)
SK(DS)
R
I
SKEW
I
V
t
t
t
t
t
t
V
V
t
t
OZR
OSR
D
PZH
PHZ
PLH
PHL
TLH
THL
PZL
PLZ
V
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
(V
referred to T
Receiver electrical characteristics
Driver switching
(V
referred to T
Driver switching characteristics
CC
CC
= 4.5V to 5.5V, T
= 4.5V to 5.5V, T
Parameter
Parameter
A
A
= 25°C, V
= 25°C, V
A
A
CC
CC
= -40 to 85°C, unless otherwise specified. Typical values are
= -40 to 85°C, unless otherwise specified. Typical values are
= 5V)
= 5V) (See
V
V
I
I
V
V
V
Jitter < 5%
R
R
R
C
C
C
C
OUT
OUT
CM
CM
O
CM
O
L
L
L
L
L
L
L
= 54 , C
= 54 , C
= 54 , C
= 50pF, S1 Closed
= 50pF, S2 Closed
= 15pF, S2 Closed
= 15pF, S1 Closed
(Note:
= 0.4V to 2.4V
= 0V to V
= -7V to 12V
= 0V
= -7V to 12V
= -4mA, V
= 4mA, V
Note:
Test conditions
Test conditions
1)
L1
L1
L1
CC
=C
=C
=C
ID
ID
1, 3)
L2
L2
L2
= -200mV
= 200mV
=50pF, (Figure 1)
=50pF, (Figure 1)
=50pF, (Figure 1)
Electrical characteristics
Min
-0.2
Min
3.5
12
30
7
Typ
Typ
4.7
0.2
0.5
70
24
50
18
8
4
Max
Max
0.2
0.4
95
30
12
30
30
30
30
2
2
6
1
Mbps
Unit
Unit
mV
K
mA
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
V
V
7/19
A