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LTC2855

更新时间： 2023-12-20 18:44:00
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
18页 366K
描述
具集成可通断终端的 3.3V 20Mbps RS485/RS422 收发器

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LTC2855 数据手册

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LTC2854/LTC2855  
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating  
temperature range, otherwise specifications are at TA = 2ꢀ°C, VCC = 3.3V unless otherwise noted (Note 2).  
SYMHOL  
Driver  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
l
l
l
|V  
OD  
|
Differential Driver Output Voltage  
R = ∞, V = 3V (Figure 1)  
V
V
V
V
V
V
CC  
CC  
CC  
CC  
R = 27Ω, V = 3V (Figure 1)  
1.5  
2
CC  
R = 50Ω, V = 3.13V (Figure 1)  
CC  
l
D|V  
|
OD  
Change in Magnitude of Driver  
Differential Output Voltage for  
Complementary Output States  
R = 27Ω or R = 50Ω (Figure 1)  
0.2  
V
l
l
V
Driver Common Mode Output Voltage  
R = 27Ω or R = 50Ω (Figure 1)  
R = 27Ω or R = 50Ω (Figure 1)  
3
V
V
OC  
D|V  
|
Change in Magnitude of Driver  
Common Mode Output Voltage for  
Complementary Output States  
0.2  
OC  
l
l
I
I
Driver Three-State (High Impedance)  
Output Current on Y and Z  
DE = OV, (Y or Z) = –7V, 12V (LTC2855)  
H-Grade  
10  
50  
µA  
µA  
OZD  
Maximum Driver Short-Circuit Current  
–7V ≤ (Y or Z) ≤ 12V (Figure 2)  
180  
250  
300  
mA  
mA  
OSD  
l
–250  
–100  
Receiver  
l
l
I
IN  
Receiver Input Current (A, B)  
DE = TE = 0V, V = 0V or 3.3V, V = 12V  
125  
250  
µA  
µA  
CC  
IN  
(Figure 3) (C-, I-Grade)  
DE = TE = 0V, V = 0V or 3.3V, V = –7V,  
CC  
IN  
(Figure 3) (C-, I-Grade)  
l
l
DE = TE = 0V, V = 0V or 3.3V, V = 12V  
µA  
µA  
CC  
IN  
(Figure 3) (H-Grade)  
DE = TE = 0V, V = 0V or 3.3V, V = –7V,  
–145  
96  
CC  
IN  
(Figure 3) (H-Grade)  
l
l
l
R
Receiver Input Resistance  
RE = V or 0V, DE = TE = 0V,  
125  
125  
kΩ  
kΩ  
V
IN  
CC  
V
= –7V, –3V, 3V, 7V, 12V (Figure 3)  
IN  
(C-, I-Grade)  
RE = V or 0V, DE = TE = 0V,  
48  
CC  
V
= –7V, –3V, 3V, 7V, 12V (Figure 3)  
IN  
(H-Grade)  
V
Receiver Differential Input Threshold  
Voltage  
–7V ≤ B ≤ 12V  
0.2  
TH  
DV  
Receiver Input Hysteresis  
B = 0V  
25  
mV  
V
TH  
l
l
l
V
V
Receiver Output HIGH Voltage  
Receiver Output LOW Voltage  
I(RO) = –4mA, A-B = 200mV, V = 3V  
2.4  
OH  
CC  
I(RO) = 4mA, A-B = –200mV, V = 3V  
0.4  
1
V
OL  
CC  
I
Receiver Three-State (High Impedance) RE = V , 0V ≤ RO ≤ V  
Output Current on RO  
µA  
OZR  
CC  
CC  
l
l
I
Receiver Short-Circuit Current  
0V ≤ RO ≤ V  
85  
mA  
Ω
OSR  
CC  
R
Receiver Input Terminating Resistor  
TE = V , V = 2V, V = –7V, 0V, 10V  
108  
2
120  
156  
TERM  
CC AB  
B
(Figure 8)  
Logic  
l
l
l
V
V
Logic Input High Voltage  
Logic Input Low Voltage  
Logic Input Current  
V
V
= 3.6V  
V
V
IH  
IL  
CC  
= 3V  
0.8  
10  
CC  
I
INL  
0
µA  
Supplies  
I
Supply Current in Shutdown Mode  
Supply Current in Receive Mode  
DE = 0V, RE = V , TE = 0V  
CCS  
CCR  
CC  
l
l
(C-, I-Grade)  
(H-Grade)  
0
0
5
µA  
µA  
15  
l
I
DE = 0V, RE = 0V, TE = 0V  
370  
900  
µA  
285455fc  
3
For more information www.linear.com/LTC2854  
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