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PDF SP485R Data sheet ( Hoja de datos )
| Número de pieza | SP485R | |
| Descripción | 1/10th Unit Load RS-485 Transceiver | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP485R (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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SP485R
1/10th Unit Load RS-485 Transceiver
FEATURES
• Allows Over 400 Transceivers On A
Transmission Line (1/10th Unit Load)
• High Impedance on Receiver Inputs
(RIN = 150kΩ typical)
• Half-Duplex Configuration Consistent
With Industry Standard Pinout
• -7V to +12V Common Mode Input
Voltage Range
• Low Power Consumption (250mW)
• Separate Driver and Receiver Enable
DESCRIPTION
The SP485R is a pin-to-pin equivalent to our existing SP485 product and offers a high
receiver input impedance. The higher receiver input impedance allows for connecting over
400 transceivers on a single transmission line without degrading the RS-485 driver signal.
The device is packaged in a 8-pin plastic DIP or 8-pin narrow SOIC.
Figure 1. Typical Application Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP485R_100_072309
1 page  
SWITCHING WAVEFORMS
+3V
DRIVER INPUT
0V
DRIVER
OUTPUT
B
A
DIFFERENTIAL VO+
OUTPUT 0V
VA –VB VO–
t SKEW = |t DPLH - tDPHL|
f ≥1MHz; tR ≤10ns; tF ≤10ns
1.5V
t PLH
t PHL
VO 1/2VO
t DPLH
t DPHL
tR
Figure 6. Driver Propagation Delays
1.5V
1/2VO
tF
+3V
DE
0V
5V
A, B
VOL
VOH
A, B
0V
f = 1MHz; tR < 10ns; tF < 10ns
1.5V
t ZL
2.3V
Output normally LOW
2.3V
t ZH
Output normally HIGH
1.5V
t LZ
0.5V
0.5V
t HZ
Figure 7. Driver Enable and Disable Times
VOD2+
A– B
VOD2–
f = 1MHz; tR ≤10ns ; tF ≤ 10ns
0V INPUT
VOH
RECEIVER OUT
VOL
tPHL
1.5V
OUTPUT
tPLH
0V
1.5V
Figure 8. Receiver Propagation Delays
+3V
RE
0V
5V
RECEIVER OUT
VIL
VIH
RECEIVER OUT
0V
1.5V f = 1MHz; tR ≤ 10ns; tF ≤ 10ns
tZL
1.5V
Output normally LOW
1.5V
tLZ
0.5V
1.5V
tZH
Output normally HIGH
0.5V
tHZ
Figure 9. Receiver Enable and Disable Times
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP485R_100_072309
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SP485R.PDF ] | |
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