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PDF SP1485E Data sheet ( Hoja de datos )
| Número de pieza | SP1485E | |
| Descripción | Enhanced Low Power Half-Duplex RS-485 Transceivers | |
| Fabricantes | Sipex | |
| Logotipo |  |
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®
PRELIMINARY
SP1485E
Enhanced Low Power Half-Duplex
RS-485 Transceivers
■ +5V supply
■ Low Power BiCMOS
■ Driver/Receiver Enable for Multi-Drop
configurations
■ Available in 8 Pin NSOIC or PDIP
packages
■ Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
RO 1
RE 2
DE 3
DI 4
SP1485E
8 Pin - nSOIC
8 VCC
7B
6A
5 GND
DESCRIPTION
The SP1485E is a half-duplex transceiver that meets the specifications of RS-485 and RS-
422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved
on this device to over +15KV for both Human Body Model and IEC1000-4-2 Air Discharge
Method. This device is pin-to-pin compatible with Sipex's SP485 devices as well as popular
industry standards. As with the original version, the SP1485E features Sipex's BiCMOS
design allowing low power operation without sacrificing performance. The SP1485E meets
the requirements of the RS-485 and RS-422 protocols up to 20Mbps under load.
BLOCK DIAGRAM
RO 1
RE 2
DE 3
DI 4
R
D
SP1485E
8 Vcc
7B
6A
5 GND
Rev:C Date: 02/26/04
SP1485E Low Power Half-Duplex RS485 Transceivers
1
© Copyright 2004 Sipex Corporation
1 page  
INPUTS
OUTPUTS
LINE
RE DE DI CONDITION B A
X 1 1 No Fault
01
X 1 0 No Fault
10
X0X
X
ZZ
X 1 X Fault
ZZ
Table 1. Transmit Function Truth Table
INPUTS
RE DE
00
00
00
10
OUTPUTS
A-B
R
+0.2V
1
-0.2V
0
Inputs Open
1
XZ
Table 2. Receive Function Truth Table
+3V
DE
0V
5V
A, B
VOL
VOH
A, B
0V
f = 1MHz; tR < 1.0ns; tF < 1.0ns
1.5V
tZL
2.3V Output normally LOW
1.5V
tLZ
0.5V
2.3V Output normally HIGH
tZH
0.5V
tHZ
Figure 6. Driver Enable and Disable Times
V0D2+
A–B
V0D2–
0V
INPUT
0V
VOH
R
VOL
tPHL
tSKEW = | tPHL - tPLH |
Figure 7. Receiver Propagation Delays
1.5V OUTPUT
tPLH
f = 1MHz; tR < 1.0ns; tF < 1.0ns
1.5V
+3V
RE
0V
5V
R
VIL
VIH
R
0V
1.5V f = 1MHz; tR < 1.0ns; tF < 1.0ns
tZL
1.5V Output normally LOW
1.5V Output normally HIGH
tZH
Figure 8. Receiver Enable and Disable Times
1.5V
tLZ
0.5V
0.5V
tHZ
Rev:C Date: 02/26/04
SP1485E Low Power Half-Duplex RS485 Transceivers
5
© Copyright 2004 Sipex Corporation
5 Page 
ORDERING INFORMATION
Model
Temperature Range
Package
SP1485ECN ..................................................... 0˚C to +70˚C ............................................... 8-pin Narrow SOIC
SP1485ECP ...................................................... 0˚C to +70˚C ................................................... 8-pin Plastic DIP
SP1485EEN .................................................... -40˚C to +85˚C ............................................. 8-pin Narrow SOIC
SP1485EEP .................................................... -40˚C to +85˚C ................................................. 8-pin Plastic DIP
SP1485EMN .................................................. -40˚C to +125˚C ............................................ 8-pin Narrow SOIC
Please consult the factory for pricing and availability on a Tape-On-Reel option.
DATE
11/11/03
12/18/03
02/26/04
REVISION
A
B
C
REVISION HISTORY
DESCRIPTION
Implemented tracking revision.
Added Driver and Receiver TPLH/TPHL AC Characteristics.
Changed Driver Input to Output values from 20ns (typ), 30ns (max) to
30ns (typ), 40ns (max). Changed Receiver Input to Output values from
25ns (typ), 70ns (max) to 40ns (typ), 50ns (max) .
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: [email protected]
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Rev:C Date: 02/26/04
SP1485E Low Power Half-Duplex RS485 Transceivers
11
© Copyright 2004 Sipex Corporation
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SP1485E.PDF ] | |
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