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PDF SP3485 Data sheet ( Hoja de datos )
| Número de pieza | SP3485 | |
| Descripción | +3.3V Low Power Half-Duplex RS-485 Transceiver | |
| Fabricantes | Exar | |
| Logotipo |  |
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1. SP3485  Hay una vista previa y un enlace de descarga de SP3485 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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SP3485
+3.3V Low Power Half-Duplex RS-485
Transceiver with 10Mbps Data Rate
• RS-485 and RS-422 Transceiver
• Operates from a single +3.3V Supply
• Interoperable with +5.0V logic
• Driver/Receiver Enable
• -7V to +12V Common-Mode Input Voltage Range
• Allows up to 32 transceivers on the serial bus
• Compatibility with industry standard 75176 pinout
• Driver Output Short-Circuit Protection
DESCRIPTION
The SP3485 device is a +3.3V low power half-duplex transceiver that meets the specifica-
tions of the RS-485 and RS-422 serial protocols. This device is pin-to-pin compatible with
the Exar SP481, SP483 and SP485 devices as well as popular industry standards. The
SP3485 can meet the electrical specifications of the RS-485 and RS-422 serial protocols
up to 10Mbps under load.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7000 • www.exar.com
1
SP3485_200_051916
1 page  
TEST CIRCUITS
D
Vcc
VOD
R
R VOC
Figure 1. Driver DC Test Load Circuit
GENERATOR
(NOTE 1)
D
50Ω
VCC
CL
15pF
(NOTE 2)
RL OUT
54Ω
Figure 2. Driver Propagation Delay Test Circuit
GENERATOR
(NOTE 1)
D
50Ω
VCC
CL
RL = OUT
60Ω
C L= 15pF (NOTE 2)
Figure 3. Driver Differential Output Delay and
Transition Time Circuit.
0V OR 3V
D
S1
GENERATOR
(NOTE 1)
50Ω
C L = 50pF
(NOTE 2)
VCC
R L = 110Ω
OUT
Figure 5. Driver Enable and Disable Timing Circuit,
Output Low
1.5V S3
-1.5V VID R
S1
1k VCC
S2
GENERATOR
(NOTE 1)
50Ω
CL= 15pF
(NOTE 2)
GENERATOR
(NOTE 1)
S1
D
50Ω
CL = 50pF
(NOTE 2)
OUT
RL = 110Ω
Figure 4. Driver Enable and Disable Timing Circuit,
Output High
GENERATOR
(NOTE 1)
V ID R
50Ω
OUT
CL = 15pF
(NOTE 2)
1.5V
0V
Figure 6. Receiver Propagation Delay Test Circuit
DE = 0 or Vcc
A
DI = 0 or Vcc
D
B
IOSD
-7V to +12V V
Figure 7. Receiver Enable and Disable Timing
Circuit
Figure 8. Driver Short Circuit Current Limit Test
NOTE 1: The input pulse is supplied by a generator with the following characteristics:
PRR = 250kHz, 50% duty cycle, tR < 6.0ns, ZO = 50Ω.
NOTE 2: CL includes probe and stray capacitance.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7000 • www.exar.com
5
SP3485_200_051916
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SP3485.PDF ] | |
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