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