ST485ABDR Просмотр технического описания (PDF) - STMicroelectronics
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ST485ABDR Datasheet PDF : 19 Pages
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ST485A
Electrical characteristics
4.3
Receiver
Table 8.
Symbol
(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are
referred to TA = 25°C, VCC = 5V) (Note: 1)
Receiver electrical characteristics
Parameter
Test conditions
Min Typ Max Unit
VTH
∆VTH
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 = -7V to 12V
VCM = 0V
IOUT = -4mA, VID = 200mV
IOUT = 4mA, VID = -200mV
VO = 0.4V to 2.4V
VCM = -7V to 12V
VO = 0V 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
4.4
Driver switching
Table 9.
Symbol
(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are
referred to TA = 25°C, VCC = 5V) (See Note: 1, 3)
Driver switching characteristics
Parameter
Test conditions
Min Typ Max Unit
DR Maximum data rate
Jitter < 5%
30 50
Mbps
tPLH
tPHL
Propagation delay input to output
RL= 54Ω, CL1=CL2=50pF, (Figure 1)
18 30 ns
tSKEW Differential output delay skew
RL= 54Ω, CL1=CL2=50pF, (Figure 1)
0.5 2
ns
tTLH
tTHL
Rise or fall differential time
RL= 54Ω, CL1=CL2=50pF, (Figure 1)
8
12 ns
tPZL Output enable time
CL= 50pF, S1 Closed
30 ns
tPZH Output enable time
CL= 50pF, S2 Closed
30 ns
tPHZ Output disable time
CL= 15pF, S2 Closed
30 ns
tPLZ Output disable time
CL= 15pF, S1 Closed
30 ns
tSK(EN)
Synchronous driver operation a-b at
enable
2
ns
tSK(DS)
Synchronous driver operation A-B
at disable
4
6
ns
7/19
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