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ST491A датащи(PDF) 6 Page - STMicroelectronics

номер детали ST491A
подробное описание детали  Low power high speed RS-485/RS-422 transceiver
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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ST491A датащи(HTML) 6 Page - STMicroelectronics

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Electrical characteristics
ST491A
6/17
4
Electrical characteristics
Table 5.
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
Min.
Typ.
Max.
Unit
ISUPPLY
No load supply current
2
5
mA
CIN
Input capacitance
1.8
pF
CYZ
Driver output capacitance
1.2
pF
COUT
Output capacitance
2.3
pF
Table 6.
Transmitter 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
VOD1
Differential drive output (no load)
VCC
V
VOD2
Differential drive output (with
load)
RL= 54Ω (RS-422) (Figure 1.)1.5
2.6
5
V
VOD3
Differential drive output (with
load)
RL= 100Ω (RS-422) (Figure 1.)2
3
V
ΔVOD
Change in magnitude of driver
differential output voltage for
complementary output states
RL= 54Ω or 100Ω (Figure 1.)0
0.2
V
VOC
Driver common mode output
voltage
RL= 54Ω (Figure 1.)1
3
V
ΔVOC
Change in magnitude of driver
common mode output voltage
RL= 54Ω (Figure 1.)0
0.2
V
IOFF
Power off output current
VCC = 0V, VO=-7V to 12V
± 100
μA
IOSD
Driver short circuit output current VO=-7V to 12V
± 35
± 250
mA
VIL
Input logic threshold low
0.8
V
VIH
Input logic threshold high
2
V


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