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ST485ABDR Scheda tecnica(PDF) 7 Page - STMicroelectronics

Il numero della parte ST485ABDR
Spiegazioni elettronici  Very high speed low power RS-485/RS-422 transceiver
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST485ABDR Scheda tecnica(HTML) 7 Page - STMicroelectronics

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ST485AB
Electrical characteristics
7/19
Table 9.
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)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VTH
Receiver Differential Threshold
Voltage
VCM = -7 V to 12 V
-0.2
0.2
V
ΔVTH
Receiver Input Hysteresis
VCM = 0 V
70
mV
VOH
Receiver Output High Voltage
IOUT = -4 mA, VID = 200 mV
3.5
4.7
V
VOL
Receiver Output Low Voltage
IOUT = 4 mA, VID = -200 mV
0.2
0.4
V
IOZR
3-State (High Impedance) Output
Current at Receiver
VO = 0.4 V to 2.4 V
± 1
μA
RRIN
Receiver Input Resistance
VCM = -7 V to 12 V
12
24
K
Ω
IOSR
Receiver Short-Circuit Current
VO = 0 V to VCC
795
mA
Table 10.
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)
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= 54 Ω, CL1=CL2=50 pF,
(Figure 8.)
18
30
ns
tSKEW
Differential output delay skew
RL= 54Ω, CL1=CL2=50 pF,
(Figure 6.)
0.5
2
ns
tTLH
tTHL
Rise or fall differential time
RL= 54Ω, CL1=CL2=50 pF,
(Figure 6.)
812
ns
tPZL
Output enable time
CL= 50 pF, S1 Closed
30
ns
tPZH
Output enable time
CL= 50 pF, S2 Closed
30
ns
tPHZ
Output disable time
CL= 15 pF, S2 Closed
30
ns
tPLZ
Output disable time
CL= 15 pF, 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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