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ST491A データシート(PDF) 7 Page - STMicroelectronics

部品番号 ST491A
部品情報  Low power high speed RS-485/RS-422 transceiver
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST491A データシート(HTML) 7 Page - STMicroelectronics

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ST491A
Electrical characteristics
7/17
Table 7.
Receiver electrical characteristics
(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are
referred to TA=25°C)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
IIN
Input current (A, B)
Other input = 0V
VCC = 0 or 5.25V
VIN=12V
0.5
1
mA
VIN=-7V
-0.35
-0.8
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
0.3
0.5
V
RRIN
Receiver input resistance
VCM = -7V to 12V
12
24
K
Ω
Table 8.
Driver switching characteristics
(VCC = 4.5V to 5.5V, 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
tPZL
Output enable time
CL= 50pF, S1 Closed
14
25
ns
tPZH
Output enable time
CL= 50pF, S2 Closed
14
25
ns
tPHZ
Output disable time
CL= 15pF, S2 Closed
10
25
ns
tPLZ
Output disable time
CL= 15pF, S1 Closed
16
25
ns


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