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ST485AB 数据表(PDF) 6 Page - STMicroelectronics

部件名 ST485AB
功能描述  Very high speed low power RS-485/RS-422 transceiver
PDF  19 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST485AB 数据表(HTML) 6 Page - STMicroelectronics

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Electrical characteristics
ST485AB
6/19
4
Electrical characteristics
Table 6.
DC 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, VCC = 5 V) (Note: 1)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
ISUPPLY VCC Power supply current
No load, VRE=0 V or VCC
VDE = VCC
2.3
5
mA
VDE = 0 V
2.6
5
mA
CI/O
Input/output capacitance
10
pF
CAB
Driver output capacity
10
pF
Table 7.
Logic input 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, VCC = 5 V) (Note: 1)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VIL
Input logic threshold low
DE, DI, RE
0.8
V
VIH
Input logic threshold high
DE, DI, RE
2
V
IIN1
Logic input current
DE, DI, RE
± 2.0
µA
IIN2
Input current (A, B)
VDE=0 V,
VCC= 0 or 5.25 V
VIN=12 V
1
mA
VIN=-7 V
-0.8
mA
Table 8.
Transmitter 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, VCC = 5 V) (Note: 1)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VOD1
Differential driver output (No load)
5
V
VOD2
Differential driver output (with load)
RL= 54 Ω (RS-422)
VCM= -7 V to 12 V
1.5
2.7
5
V
ΔVOD
Change in magnitude of driver
differential output voltage for
complementary output states
(Note: 1)
RL= 27 Ω or 50 Ω
00.2
V
VOC
Driver common mode output
voltage
RL= 27 Ω or 50 Ω
13
V
ΔVOC
Change in magnitude of driver
common mode output voltage
(Note: 1)
RL= 54 Ω or 100 Ω
00.2
V
IOSD
Driver short circuit output current
VO= -7 V to 12 V
± 250
mA



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