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PDF SP481E Data sheet ( Hoja de datos )
| Número de pieza | SP481E | |
| Descripción | Enhanced Low Power Half-Duplex RS-485 Transceivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP481E (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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SP481E / SP485E
Enhanced Low Power Half-Duplex
RS-485 Transceivers
• +5V Only
• Low Power BiCMOS
• Driver / Receiver Enable for Multi-Drop
configurations
• Low Power Shutdown mode (SP481E)
• Enhanced ESD Specifications:
+/-15kV Human Body Model
+/-15kV IEC61000-4-2 Air Discharge
• Available in RoHS Compliant, Lead Free
Packaging.
DESCRIPTION
The SP481E and SP485E are a family of half-duplex transceivers that meet the specifications
of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD toler-
ance has been improved on these devices to over +15kV for both Human Body Model and
IEC61000-4-2 Air Discharge Method. These devices are pin-to-pin compatible with Exar's
SP481 and SP485 devices as well as popular industry standards. As with the original ver-
sions, the SP481E and SP485E feature Exar's BiCMOS design allowing low power opera-
tion without sacrificing performance. The SP481E and SP485E meet the requirements of
the RS-485 and RS-422 protocols up to 10Mbps under load. The SP481E is equipped with
a low power shutdown mode.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP481E,485E_104_052413
1 page  
A
VOD
B
R
R VOC
Figure 1. RS-485 Driver DC Test Load Circuit
PIN FUNCTION
Pin 1 - RO - Receiver Output
Pin 2 - RE - Receiver Output Enable Active LOW
Pin 3 - DE - Driver Output Enable Active HIGH
Pin 4 DI - Driver Input
Pin 5 - GND - Ground Connection
Pin 6 - A - Driver Output / Receiver input
Non-Inverting
Pin 7 - B - Driver Output / Receiver Input Inverting
Pin 8 - Vcc - Positive Supply 4.75V ≤ Vcc ≤ 5.25V
Test Circuits
Receiver
Output
Test Point
1kΩ
S1 VCC
CRL 1kΩ
S2
Figure 2. Receiver Timing Test Load Circuit
CL1
DI A RL
B
CL2
A
RO
B
15pF
Output
Under
Test CL
500Ω
S1 VCC
S2
Figure 3. RS-485 Driver/Receiver Timing Test
Figure 4. Driver Timing Test Load #2 Circuit
f ≥ 1MHz; tR ≤10ns; tF ≤10ns
+3V
DRIVER INPUT
0V
DRIVER
OUTPUT
B
A
DIFFERENTIAL VO+
OUTPUT 0V
VA –VB VO–
t SKEW = |t DPLH - tDPHL|
1.5V
VO 1/2VO
t PLH
t DPLH
tR
t PHL
t DPHL
Figure 5. Driver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
1.5V
1/2VO
tF
SP481E,485E_104_052413
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SP481E.PDF ] | |
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