ST485B(2009) 데이터 시트보기 (PDF) - STMicroelectronics
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ST485B Datasheet PDF : 12 Pages
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Electrical characteristics
4
Electrical characteristics
ST485B - ST485C
VCC = 5 V ± 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred
to TA = 25 °C
Table 6. DC electrical characteristics
Symbol
Parameter
Test conditions (1)
Value
-40 to 85 °C
-55 to 125 °C Unit
VOD1
VOD2
ΔVOD
VOC
ΔVOC
VIH
VIL
IIN1
IIN2
VTH
ΔVTH
VOH
VOL
IOZR
RIN
ICC
Differential driver output
(no load)
Differential driver output
(with load)
RL = 27Ω (RS-485) Figure 2
RL = 50Ω (RS-422) Figure 2
Change in magnitude of
driver differential output
voltage for complementary
output states
RL = 27Ω or 50Ω Figure 2
Driver common-mode
output voltage
RL = 27Ω or 50Ω Figure 2
Change in magnitude of
driver common-mode
output voltage for
complementary output
states
RL = 27Ω or 50Ω Figure 2
Input high voltage
RE, DE, DI
Input low voltage
RE, DE, DI
Input current
RE, DE, DI
Input current (A, B)
Receiver differential
threshold voltage
VCM = 0V or 5.25V, VDE = 0V
VIN = 12V
VIN = -7V
VCM = -7 to 12V
Receiver input hysteresis
Receiver output high
voltage
VCM = 0V
IO = -4mA, VID = 200mV
Receiver output low
voltage
IO = 4mA, VID = -200mV
3-state (high impedance)
output current at receiver
VO = 0.4 to 2.4V
Receiver input resistance
No load supply current (2)
VCM = -7 to 12V
VRE = 0V or VCC
VDE = VCC
VDE = 0V
Min. Typ. Max. Min. Max.
5
5
V
1.5
5
5
1.4
5
5
V
V
0.2
0.2 V
3
3
V
0.2
0.2 V
2.0
2.0
V
0.8
0.8 V
±2
± 2 µA
1
1 mA
-0.8
-0.8 mA
-0.2
0.2 -0.2 0.2 V
70
mV
3.5
3.4
V
0.4
0.55 V
±1
± 1 µA
24
24
kΩ
400 900
300 500
900 µA
500 µA
6/19
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