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SP303 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 SP303
기능 Transceiver
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SP303 데이터시트, 핀배열, 회로
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




SP303 pdf, 반도체, 판매, 대치품
Pin 26 — ROUTA1 — RXD; TTL output to
UART.
Pin 27 — N.C. — No Connection.
Pin 28 — VCC — +5V Power Supply.
PIN ASSIGNMENTS — MACINTOSH™
APPLETALK™ MODE
Pin 1 — VDD — +12V Power Supply.
Pin 2 — RINA2 — Receive data; received at
UART’s RxD (non–inverted); VIH = 0.2V;
VIL = –0.2V; RIN =3kminimum.
Pin 3 — RINA1 — Receive data; received at
UART’s RxD (inverted); VIH = 0.2V;
VIL = –0.2V; RIN =3kminimum.
Pin 4 — N.C. — No Connection.
Pin 5 — TOUTA2 — Transmit data; driven from
UART’s TxD (non–inverted); tri–stated when
UART’s RTS is not asserted; VOH = 3.6V min;
VOL = –3.6V min; RL = 450.
Pin 6 — TOUTA1 — Transmit data; driven from
UART’s TxD (inverted); tri–stated when RTS
is not asserted; VOH = 3.6V min; VOL = –3.6V
min RL = 450.
Pin 7 — SEL A — Select A; used with Select B
(pin 8) to select operating mode. Logic “0” on
both SEL A and SEL B selects RS-232 mode;
logic “1” on both SEL A and SEL B selects
AppleTalk™ mode.
Pin 8 — SEL B — Select B; used with Select A
(pin 7) to select operating mode. Logic “0” on
both SEL A and SEL B selects RS-232 mode;
logic “1” on both SEL A and SEL B selects
AppleTalk™ mode.
Pin 9— TOUTB1— Handshake output; driven
VfroOmL =U–A3R.6TV’smDiTn;RR(iLn=ve4r5te0d) ;.VOH = 3.6V min;
Pin 10 — TOUTB2 — Handshake output; driven
from UART’s DTR (non–inverted); VOH = 3.6V
min; VOL = –3.6V min; RL = 450.
Pin 11 — N.C. — No Connection.
Pin 12— RINB1— Handshake input or external
clock; received non–inverted at UART’s CTS
and TRxC; VIH = 0.2V; VIL = –0.2V; RIN =3k
minimum.
Pin 13 — N.C. — No Connection.
Pin 14 — GND — Signal ground. Connected to
logic and chasis ground.
Pin 15 — VEE — –12V Power Supply.
Pin 16 — N.C. — No Connection.
Pin 17 — ROUTB1 — Receive handshake out-
put; connects to UART’s CTS and TRxC.
Pin 18 — N.C. — No Connection.
Pin 19 — TOUTB2 — Not used in AppleTalk™
mode.
Pin 20 — TINB1 — Transmit handshake input;
connects to UART’s DTR output.
Pin 21 — N.C. — No Connection.
Pin 22 — TxEN — Transmit data driver enable;
connects to UART’s RTS; transmit data driver
is enabled when this pin is low.
Pin 23 — TINA1 — Transmit data input; con-
nects to UART’s TxD output.
Pin 24 — N.C. — No Connection.
Pin 25 — N.C. — No Connection.
Pin 26 — ROUTA1 — Receive data output:
connects to UART’s RxD input.
Pin 27 — N.C. — No Connection.
Pin 28 — VCC — +5V Power Supply.
FEATURES…
The SP303 is a single chip device that offers
both RS-232 and AppleTalk interfaces. When
configured for RS-232 mode, the SP303 pro-
vides 4 drivers and 4 receivers. When the part is
programmed for AppleTalk mode, the SP303
supports Macintosh–type ports. The mode can
be changed at any time by bringing both the SEL
A and the SEL B pins high for Mac mode, or low
for RS-232 mode.
The RS-232 line driver circuits convert TTL–
logic level inputs into inverted RS-232 output
signals. The RS-232 receivers convert the EIA
RS-232 input signals to inverted TTL output
logic levels. The receivers have voltage hyster-
esis, which helps eliminate spurious output tran-
sitions that might result from low–amplitude
noise voltages during slower-speed signal tran-
sitions.
When the SP303 is programmed for Mac mode,
the transmit data and receive data signals are
72
Corporation
SIGNAL PROCESSING EXCELLENCE

4페이지










SP303 전자부품, 판매, 대치품
the transmit data driver in ApppleTalk™ mode.
Both differential drivers have output signals on
each pin that typically swing ±6V. The peak to
peak differential voltage swing is typically ±12V.
The second driver is used for transmitting the
handshake output signal and can be used as
either a differential driver or single ended. This
particular application required a single–ended
inverting signal for the handshake output signal.
Some Macintosh equipment requires an extra
single–ended inverting receiver which is called
a general purpose input. The GPI receiver is
normally connected to pin 7 on the external 8 pin
connector. This receiver is not available on the
SP303CT.
Since the SP303CT is usually connected to the
outside world, it is suggested that the user place
transient voltage suppression devices on each of
the 1/0 lines to ensure up to ±25kV ESD protec-
tion.
POWER SUPPLY SEQUENCING
There are two requirements for power supply
sequencing for the SP303. The first is that VDD
is always greater than VCC. The second is that
when the part is powered up, VDD must be
applied 20ms before VCC.
RTS
TXD
RXD
CTS
DTR
RTS
TXD
RXD
CTS
DTR
SUPPLY
+5V +12V –12V
28 1 15
7
VCC VDDVEE
SELECT A
8 SELECT B
22
23
6
5
26
SP303
17
2
3
12
13
20
14 GND
9
10
SUPPLY
+5V +12V –12V
28 1 15
7
VCC VDDVEE
SELECT A
8 SELECT B
22
23
6
5
26
SP303
17
2
3
12
13
20
14 GND
9
10
RFI FILTER TXDA–
TXDA+
RFI FILTER
RFI FILTER RXDA+
RFI FILTER
RXDA–
RFI FILTER HSKiA
RFI FILTER HSKoA
No Connect
876
5 43
21
RFI FILTER TXDA–
TXDA+
RFI FILTER
RFI FILTER RXDA+
RFI FILTER
RXDA–
RFI FILTER HSKiA
RFI FILTER HSKoA
No Connect
876
5 43
21
Figure 4. Macintosh™ AppleTalk™ Interface.
Corporation
SIGNAL PROCESSING EXCELLENCE
75

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