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SP333 Datasheet(PDF) 6 Page - Sipex Corporation

Part # SP333
Description  5V Only RS-232/AppleTalk??Programmable Transceiver
Download  13 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP333 Datasheet(HTML) 6 Page - Sipex Corporation

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6
Rev 07/29/02
SP333 RS-232/AppleTalk Programmable Transceiver
© Copyright 2002 Sipex Corporation
THEORY OF OPERATION...
The SP333 is a single chip device that can be
configured via software for either RS-232 or
AppleTalk™ interface modes at any time. The
SP333 is made up of three basic circuit ele-
ments: single-ended drivers and receivers, dif-
ferential drivers and receivers, and charge pump.
APPLETALK™ DRIVERS/RECEIVERS...
To program the SP333 for MacMode, Pin 25
should be connected to a logic HIGH.
In
MacMode, the SP333 offers a complete
AppleTalk serial interface.
The driver section of the AppleTalk interface is
made up of a differential driver and a single-
ended inverting driver. The differential driver
has voltage swings that are typically
±5V on
each output pin under loaded conditions, and
typically
±8V under no-load conditions. The
differential driver can maintain
±3.6V (mini-
mum) swings (per pin) under worst case load
conditions of 450
Ω between the differential
output.
The differential driver is equipped with a tri-
state control pin. When TXEN is a logic LOW,
the differential driver is active. When the TXEN
pin is a logic HIGH, the differential driver
outputs are tri-stated.
The TXEN pin only
functions in MacMode.
The differential
AppleTalk driver can support data rates up to
5Mbps.
The single-ended AppleTalk driver also has
typical voltage output swings of
±5V under
loaded conditions, and
±8V under no-load con-
ditions. The single-ended AppleTalk driver can
maintain
±3.6V (minimum) swings under worst
case conditions of 450
Ω to ground. The single-
ended AppleTalk driver can support data rates
up to 5Mbps.
The receiver section of the SP333 is made up of
a differential receiver, a single-ended non-in-
verting receiver , and a single-ended inverting
receiver. The differential receiver has an input
sensitivity of
±200mV over a common mode
range of
±7V. The receivers have a typical input
resistance of 15k
Ω (12kΩ minimum).
The
differential receiver can receive data up to
5Mbps.
The single-ended non-inverting receiver has a
±200mV input threshold, however, the input
voltage can vary between
±7V. The typical
input resistance of the single-ended non-invert-
ing receiver is 15k
Ω (12kΩ minimum). The
single-ended non-inverting receiver can also
receive data up to 5Mbps.
The SP333 also has a single-ended inverting
receiver input. This receiver is basically an RS-
232 receiver (R5 receiver) and is typically used
as a GPI (General Purpose Input) in the
AppleTalk interface. The GPI input has TTL-
compatible input thresholds that can receive
signals up to
±15V. The input resistance of the
single-ended inverting receiver is typically 5k
(3k
Ω to 7kΩ). The GPI receiver can operate up
to 5Mbps.
+3V
0V
RXEN
5V
RXx
0V
1.5V
1.5V
tZL
tZH
f = 1MHz; tR < 10ns; tF < 10ns
1.5V
1.5V
tLZ
tHZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
VIL
VIH
RXx
Figure 6. Receiver Enable and Disable Times


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