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ST490AB 数据表(PDF) 7 Page - STMicroelectronics

部件名 ST490AB
功能描述  Low power high speed RS-485/RS-422 transceiver
PDF  17 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST490AB 数据表(HTML) 7 Page - STMicroelectronics

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ST490AB
Electrical characteristics
7/17
Table 8.
Receiver electrical characteristics
(VCC = 4.5 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
IIN1
Logic input current
± 2.0
μA
IIN2
Input current (A, B)
Other input=0V
VCC= 0 or 5.25V
VIN=12V
0.5
1
mA
VIN=-7V
-0.35
-0.8
mA
VTH
Receiver differential threshold
voltage
VCM = -7V to 12V
-0.2
0.2
V
ΔVTH
Receiver input hysteresis
VCM = 0V
70
mV
VOH
Receiver output high voltage
IOUT = -8mA, VID = 200mV
3.5
4.7
V
VOL
Receiver output low voltage
IOUT = 8mA, VID = -200mV
0.2
0.4
V
RRIN
Receiver input resistance
VCM = -7V to 12V
12
24
k
Ω
IOSR
Receiver short-circuit current
VO = 0V to VCC
795
mA
Table 9.
Driver switching characteristics
(VCC = 4.5 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
DR
Maximum data rate
Jitter <5%
25
50
Mbps
tPLH
tPHL
Propagation delay input
to output
RL= 54Ω, CL1=CL2=50pF, (Figure 1)10
16
ns
tSKEW
Differential output delay
skew
RL= 54Ω, CL1=CL2=50pF, (Figure 1)1
3
ns
tTLH
tTHL
Rise or fall differential
time
RL= 54Ω, CL1=CL2=50pF, (Figure 1)8
12
ns
Table 10.
Receiver switching characteristics
(VCC = 4.5 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are
referred to TA = 25 °C)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
tPLH
tPHL
Propagation delay input
to output
CL = 15pF, (Figure 2, Figure 4)19
30
ns
tSKD
|tPLH - tPHL| Receiver
output skew
CL = 15pF, (Figure 2, Figure 4)1
3
ns
tTLH
tTHL
Rise or fall time
CL = 15pF, (Figure 2, Figure 4)8
ns



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