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參數(shù)資料
| 型號： | SP332ET-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232/485 SRL 28WSOIC |
| 標準包裝： | 1,500 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 4/4 |
| 規(guī)程： | RS232，RS485 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 帶卷 (TR) |
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP332_00_0260
TEST CIRCUITS
A
B
R
VOD
VOC
Figure 1. RS-485 Driver DC Test Load Circuit
C
L1
15pF
RO
A
B
A
B
DI
C
L2
R
DIFF
Figure 3. RS-485 Driver/Receiver Timing Test Circuit
500
CL
Output
Under
Test
S1
S2
VCC
Figure 4. RS-485 Driver Timing Test Load #2 Circuit
1K
CRL
Receiver
Output
S1
S2
Test Point
VCC
Figure 2. Receiver Timing Test Load Circuit
SWITCHING WAVEFORMS
+3V
0V
DRIVER INPUT
A
B
DRIVER
OUTPUT
VO+
DIFFERENTIAL
OUTPUT
VA –VB
0V
VO–
1.5V
tPLH
tF
tR
f ≥1MHz; tR ≤10ns; tF ≤10ns
VO 1/2VO
1/2VO
tPHL
tSKEW= |tDPLH-tDPHL|
tDPLH
tDPHL
Figure 5. RS-485 Driver Propagation Delays
VOH
VOL
RECEIVER OUT
1.5V
tPHL
f = 1MHz; tR 10ns; tF ≤ 10ns
OUTPUT
VOD2+
VOD2–
A – B
0V
tPLH
INPUT
≤
Figure 6. RS-485 Receiver Propagation Delays
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