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PDF SP303 Data sheet ( Hoja de datos )
| Número de pieza | SP303 | |
| Descripción | Transceiver | |
| Fabricantes | Sipex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP303 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Corporation
SIGNAL PROCESSING EXCELLENCE
SP303
RS232/AppleTalk™ Serial Transceiver
s Single chip serial transceiver supports
AppleTalkTM or RS-232 interface
s Programmable Selection of Interface
s 4 RS-232 Drivers and 4 RS-232
Receivers
s Provides MacintoshTM type interface
s ±30V Receiver Input Levels
s Surface Mount Packaging
DESCRIPTION…
The SP303 is a single chip device that offers both RS-232 and AppleTalk™ interfaces. When
configured for RS-232 mode the SP303 has 4 drivers and 4 receivers. When the part is
programmed for AppleTalk mode, the SP303 supports Macintosh–type ports. All drivers and
receivers can operate at data rates up to 1 Mbps. The differential driver used for transmitting data
signals is equipped with a tri-state function. The SP303 is available in a 28–pin SOIC package
for operation over the commercial temperature range.
+5V INPUT
+12V INPUT
–12V INPUT
TOUTB1 TOUTB2 TOUTA1 TOUTA2
RINA1 RINA2
VCC
VDD
VEE
SELECT
AB
T1
T2
T3
T4
R1
SP303
R2
RINB1 RINB2
GND
R3 R4
TINB1 TINB2 TINA1 TINA2 TXEN ROUTA1 ROUTA2 ROUTB1 ROUTB2
Corporation
SIGNAL PROCESSING EXCELLENCE
69
1 page  
SUPPLY
+5V +12V –12V
28 1 15
VCC VDD VEE
TINA1 23
T1
6
TOUTA1
TINA2 24
T2
5
TOUTA2
20
TINB1
T3
9
TOUTB1
TINB2 19
T4
26 SP303
ROUTA1
R1
27
ROUTA2
R2
ROUTB1 17
R3
16
ROUTB2
R4
10 TOUTB2
3
RINA1
2
RINA2
12
RINB1
13
RINB2
14 GND SELECT
AB
78
Figure 1. RS232 Operating Mode
differential, while the handshake-out and hand-
shake-in signals are single–ended. The SP303
does not have the extra GPI (General Purpose
Input). All drivers and receivers can operate at
data rates up to 1 Mbps. The differential driver
used for transmitting data signals is equipped
with a tri-state function. When the TxEN pin is
brought low, the differential driver is enabled;
when it is high, the driver outputs are tri–stated.
The tri–state function does not affect any other
driver in either mode of operation.
One SP303 can significantly reduce the board
space necessary for a similar discrete solution
offering both RS-232 and AppleTalk interfaces.
Due to the space savings, the SP303 can provide
multi-mode interfacing to equipment such as
printers or modems without sacrificing addi-
tional board space or cost. This allows the OEM
to offer more flexible interface capabilities with-
out additional material costs.
The SP303 is available in a 28–pin SOIC pack-
age for operation over the commercial tempera-
ture range.
APPLICATION EXAMPLE
RS-232 MODE SERIAL INTERFACE
Figure 3 shows the SP303CT used in a dual
serial port application which allows both
RS-232 and Macintosh™ AppleTalk™ Mode
interfaces. With SEL A and SEL B low, the port
can be configured for RS-232. In this mode, the
SP303CT is set up for 4 drivers and 4 receivers.
The transmitter enable pin (pin22) has no effect
in this mode.
The RFI filters shown are optional depending
upon the FCC requirements of the system. The
SP303CT has internal slew rate limiting, which
keeps the RS-232 slew rate <30V/µs. Since the
SUPPLY
+5V +12V –12V
28 1 15
7 VCC VDD VEE
SELECT A
8 SELECT B
23
TINA1
T1
22
TXEN
20
TINB1
T2
SP303
26
ROUTA1
R1
5
TOUTA2
6
TOUTA1
9 TOUTB1
10 TOUTB2
2 RINA2
3 RINA1
17
ROUTB1
14
GND
R2
12 RINB1
13
Figure 2. Macintosh™ AppleTalk™ Operating Mode
Corporation
SIGNAL PROCESSING EXCELLENCE
73
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SP303.PDF ] | |
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