參數(shù)資料
型號(hào): SP3485CN-L/TR
廠商: Exar Corporation
文件頁(yè)數(shù): 5/9頁(yè)
文件大?。?/td> 0K
描述: IC TXRX RS485 HALF DUPLEX 8NSOIC
標(biāo)準(zhǔn)包裝: 2,500
類型: 收發(fā)器
驅(qū)動(dòng)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: SP3485CN-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
0V OR 3V
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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