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參數(shù)資料
| 型號： | SP3485EN-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 5/9頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485 HALF DUPLEX 8NSOIC |
| 標準包裝： | 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： | 3.3V |
| 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-SOICN |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | SP3485EN-L/TR-ND |
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3485_00_0692
TEST CIRCUITS
R
V
OC
D
Vcc
V
OD
Figure . Driver DC Test Load Circuit
GENERATOR
(NOTE 1)
50
C
L
OUT
D
VCC
R
L =
60
CL= 15pF (NOTE 2)
Figure 3. Driver Differential Output Delay and
Transition Time Circuit.
GENERATOR
(NOTE 1)
50
S1
RL = 110
OUT
CL = 50pF
(NOTE 2)
VOM =
≈ 1.5V
VOH + VOL
2
D
Figure 4. Driver Enable and Disable Timing Circuit,
Output High
Figure 2. Driver Propagation Delay Test Circuit
GENERATOR
(NOTE 1)
50
VCC
S1
VDM
RL = 27
OUT
C L = 15pF
(NOTE 2)
VOM =
≈ 1.5V
VOH + VOL
2
D
Figure 5. Driver Enable and Disable Timing Circuit,
Output Low
GENERATOR
(NOTE 1)
50
S1
RL = 110
OUT
C L = 50pF
(NOTE 2)
D
VCC
GENERATOR
(NOTE 1)
50
1.5V
0V
VID
R
OUT
CL = 15pF
(NOTE 2)
VOM = VCC
2
Figure 6. Receiver Propagation Delay Test Circuit
1.5V
-1.5V
S3
VID
GENERATOR
(NOTE 1)
50
CL= 15pF
(NOTE 2)
R
1k
S1
S2
VCC
A/Y
D
DI = 0 or Vcc
B/Z
DE = 0 or Vcc
IOSD
100
-7V to +12V V
Figure 7. Receiver Enable and Disable Timing
Circuit
Figure 8. Driver Short Circuit Current Limit Test
NOTE : The input pulse is supplied by a generator with the following characteristics:
PRR = 250kHz, 50% duty cycle, t
R < 6.0ns, ZO = 50.
NOTE 2: C
L includes probe and stray capacitance.
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