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SP233A Datasheet(PDF) 4 Page - Sipex Corporation

Part # SP233A
Description  Enhanced RS-232 Line Drivers/Receivers
Download  12 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP233A Datasheet(HTML) 4 Page - Sipex Corporation

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Date: 10/17/ 05
SP232A Series Enhanced RS232 Transceivers
© Copyright 2005 Sipex Corporation
4
Figure 1. Typical Circuit using the SP232A.
FEATURES…
The
SP232A/233A/310A/312A devices are a
family of line driver and receiver pairs that meet
the specifications of RS-232 and V.28 serial
protocols. The ESD tolerance has been im-
proved on these devices to over
±2KV for the
Human Body Model. These devices are pin-to-
pin compatible with popular industry standards.
The
SP232A/233A/310A/312A devices
feature10V/
µs slew rate, 120Kbps data rate un-
der load, 0.1
µF charge pump capacitors, overall
ruggedness for commercial applications, and
increased drive current for longer and more
flexible cable configurations. This family also
features Sipex's BiCMOS design allowing low
power operation without sacrificing perfor-
mance.
The
SP232A/233A/310A/312A devices have
internal charge pump voltage converters which
allow them to operate from a single +5V supply.
The charge pumps will operate with polarized or
non-polarized capacitors ranging from 0.1 to 1
µF
and will generate the
±6V needed for the RS-
232 output levels. Both meet all EIA RS-232F
and ITU V.28 specifications.
The SP310A provides identical features as the
SP232A with the addition of a single control
line which simultaneously shuts down the inter-
nal DC/DC converter and puts all transmitter
and receiver outputs into a high impedance
state. The SP312A is identical to the SP310A
with separate tri-state and shutdown control
lines.
THEORY OF OPERATION
The SP232A, SP233A, SP310A and SP312A
devices are made up of three basic circuit blocks –
1) a driver/transmitter, 2) a receiver and 3) a charge
pump. Each block is described below.
Driver/Transmitter
The drivers are inverting transmitters, which ac-
cept TTL or CMOS inputs and output the RS-232
signals with an inverted sense relative to the input
logic levels. Typically the RS-232output voltage
swing is
±6V. Even under worst case loading
conditions of 3kOhms and 2500pF, the output is
guaranteed to be
±5V, which is consistent with the
RS-232 standard specifications. The transmitter
outputs are protected against infinite short-circuits
to ground without degradation in reliability.
R2
98
R IN
R OUT
2
R1
12
13
R IN
R OUT
1
T2
10
7
T IN
2
T OUT
2
T1
11
14
T IN
1
T OUT
1
15
GND
400k Ω
400k Ω
3
1
C +
C -
1
1
6
16
V
CC
V+
+
+
0.1 F
6.3V
µ
Charge Pump
+5V INPUT
2
V-
2
1
5k Ω
0.1 F
10V
µ
5k Ω
5
4
C +
C -
2
2
+
0.1 F
10V
µ
0.1 F 6.3V
µ
10 F 6.3V
µ
SP232A
+
+
*
*The negative terminal of the V+ storage capacitor can be tied
to either VCC or GND. Connecting the capacitor to VCC (+5V)
is recommended.


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