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ST485ABDR 数据表(PDF) 7 Page - STMicroelectronics

部件名 ST485ABDR
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

ST485ABDR 数据表(HTML) 7 Page - STMicroelectronics

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ST485A
Electrical characteristics
7/19
4.3
Receiver
(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)
4.4
Driver switching
(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)
Table 8.
Receiver electrical characteristics
Symbol
Parameter
Test conditions
Min
Typ
Max
Unit
VTH
Receiver Differential Threshold
Voltage
VCM = -7V to 12V
-0.2
0.2
V
∆V
TH
Receiver Input Hysteresis
VCM = 0V
70
mV
VOH
Receiver Output High Voltage
IOUT = -4mA, VID = 200mV
3.5
4.7
V
VOL
Receiver Output Low Voltage
IOUT = 4mA, VID = -200mV
0.2
0.4
V
IOZR
3-State (High Impedance) Output
Current at Receiver
VO = 0.4V to 2.4V
± 1
µA
RRIN
Receiver Input Resistance
VCM = -7V to 12V
12
24
K
Ω
IOSR
Receiver Short-Circuit Current
VO = 0V to VCC
795
mA
Table 9.
Driver switching characteristics
Symbol
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
2ns
tSK(DS)
Synchronous driver operation A-B
at disable
46
ns



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