For more information www.linear.com/LTC485 SWITCHING TIME WAVEFORMS TEST CIRCUITS
參數(shù)資料
型號: LTC485CS8#TRPBF
廠商: Linear Technology
文件頁數(shù): 11/14頁
文件大?。?/td> 0K
描述: IC TXRX INTRFC RS485 LOPWR 8SOIC
標(biāo)準(zhǔn)包裝: 2,500
類型: 收發(fā)器
驅(qū)動器/接收器數(shù): 1/1
規(guī)程: RS485
電源電壓: 4.75 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 帶卷 (TR)
LTC485
6
485fk
For more information www.linear.com/LTC485
SWITCHING TIME WAVEFORMS
TEST CIRCUITS
VOD
A
B
R
VOC
485 F01
Figure 1. Driver DC Test Load
Figure 2. Receiver Timing Test Load
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2
RECEIVER
OUTPUT
CRL
15pF
1k
S1
S2
TEST POINT
VCC
1k
485 F02
3V
DE
A
B
DI
RDIFF
CL1
CL2
RO
15pF
A
B
RE
485 F03
OUTPUT
UNDER TEST
CL
S1
S2
VCC
500
485 F04
Figure 5. Driver Propagation Delays
DI
3V
1.5V
tPLH
tr
tSKEW
1/2 VO
VO
80%
10%
0V
B
A
VO
–VO
0V
90%
1.5V
tPLH
tSKEW
1/2 VO
f = 1MHz, tr ≤ 10ns, tf ≤ 10ns
20%
tf
VDIFF = V(A) – V(B)
485 F05
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