ST485ABN 데이터 시트보기 (PDF) - STMicroelectronics
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ST485ABN Datasheet PDF : 19 Pages
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ST485AB
Electrical characteristics
Table 9.
Symbol
Receiver 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)
Parameter
Test conditions
Min. Typ. Max. Unit
VTH
ΔVTH
VOH
VOL
IOZR
RRIN
IOSR
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
3-State (High Impedance) Output
Current at Receiver
Receiver Input Resistance
Receiver Short-Circuit Current
VCM = -7 V to 12 V
VCM = 0 V
IOUT = -4 mA, VID = 200 mV
IOUT = 4 mA, VID = -200 mV
VO = 0.4 V to 2.4 V
VCM = -7 V to 12 V
VO = 0 V to VCC
-0.2
0.2 V
70
mV
3.5 4.7
V
0.2 0.4 V
± 1 μA
12 24
KΩ
7
95 mA
Table 10.
Symbol
Driver switching 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) (See Note: 1, Note 3)
Parameter
Test conditions
Min. Typ. Max. Unit
DR Maximum data rate
tPLH
tPHL
Propagation delay input to output
tSKEW Differential output delay skew
Jitter < 5%
RL= 54 Ω, CL1=CL2=50 pF,
(Figure 8.)
RL= 54Ω, CL1=CL2=50 pF,
(Figure 6.)
tTLH
tTHL
tPZL
tPZH
tPHZ
tPLZ
tSK(EN)
Rise or fall differential time
RL= 54Ω, CL1=CL2=50 pF,
(Figure 6.)
Output enable time
CL= 50 pF, S1 Closed
Output enable time
CL= 50 pF, S2 Closed
Output disable time
CL= 15 pF, S2 Closed
Output disable time
CL= 15 pF, S1 Closed
Synchronous driver operation a-b at
enable
tSK(DS)
Synchronous driver operation A-B
at disable
30 50
Mbps
18 30 ns
0.5
2
ns
8 12 ns
30 ns
30 ns
30 ns
30 ns
2
ns
4
6
ns
7/19
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