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SP3223EUEP Datasheet(PDF) 10 Page - Sipex Corporation

Part # SP3223EUEP
Description  High Speed Intelligent 3.0V to 5.5V RS-232 Transceivers
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP3223EUEP Datasheet(HTML) 10 Page - Sipex Corporation

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Date: 06/28/04
SP3223EU/3243EU +3.0V to +5.5V RS-232 Transceivers
© Copyright 2004 Sipex Corporation
10
DESCRIPTION
The SP3223EU and SP3243EU transceivers
meet the EIA/TIA-232 and ITU-T V.28/V.24
communication protocols and can be
implemented in battery-powered, portable, or
hand-held applications such as notebook or
palmtop computers. The SP3223EU and
SP3243EU devices feature Sipex's proprietary
and patented (U.S.-- 5,306,954) on-board charge
pump circuitry that generates
±5.5V RS-232
voltage levels from a single +3.0V to +5.5V
power supply. The SP3223EU and SP3243EU
devices can operate at a data rate of 1000kbps
fully loaded.
The SP3223EU is a 2-driver/2-receiver device,
and the SP3243EU is a 3-driver/5-receiver device,
ideal for portable or hand-held applications. The
SP3243EU includes one complementary
always-active receiver that can monitor an
external device (such as a modem) in shutdown.
This aids in protecting the UART or serial
controller IC by preventing forward biasing
of the protection diodes where V
CC may be
disconnected.
The SP3223EU and SP3243EU series is an ideal
choice for power sensitive designs. The
SP3223EU and SP3243EU devices feature
AUTO ON-LINE® circuitry which reduces the
power supply drain to a 1
µA supply current. In
many portable or hand-held applications, an RS-
232 cable can be disconnected or a connected
peripheral can be turned off. Under these condi-
tions, the internal charge pump and the drivers
will be shut down. Otherwise, the system auto-
matically comes online. This feature allows de-
sign engineers to address power saving concerns
without major design changes.
THEORY OF OPERATION
The SP3223EU and SP3243EU series is made
up of four basic circuit blocks:
1. Drivers
2. Receivers
3. the Sipex proprietary charge pump, and
4. AUTO ON-LINE® circuitry.
Drivers
The drivers are inverting level transmitters that
convert TTL or CMOS logic levels to 5.0V EIA/
TIA-232 levels with an inverted sense relative to
the input logic levels. Typically, the RS-232
output voltage swing is +5.4V with no load and
+5V minimum fully loaded. The driver outputs
are protected against infinite short-circuits to
ground without degradation in reliability. These
drivers comply with the EIA-TIA-232-F and all
previous RS-232 versions. Unused drivers in-
puts should be connected to GND or V
CC.
The drivers have a minimum data rate of
1000kbps fully loaded with 3k
Ω in parallel with
250pF, ensuring compatibility with PC-to-PC
communication software.
Figure 16. Interface Circuitry Controlled by Micropro-
cessor Supervisory Circuit
SP3243EU
28
24
2
1
27
3
26
5KΩ
5KΩ
5KΩ
5KΩ
5KΩ
GND
C1+
C1-
C2+
C2-
V+
V-
VCC
14
13
12
20
19
18
17
16
15
0.1µF
0.1µF
0.1µF
+
C2
C5
C1
+
+
C3
C4
+
+
0.1µF
0.1µF
9
10
11
4
5
6
7
8
RS-232
OUTPUTS
RS-232
INPUTS
23
22
21
VCC
25
T
1IN
R
1OUT
R
1IN
T
2OUT
R
2OUT
T
2IN
T
3IN
T
3OUT
T
1OUT
R
2IN
R
3IN
R
4IN
R
5IN
R
2OUT
R
3OUT
R
4OUT
R
5OUT
ONLINE
SHUTDOWN
STATUS
UART
or
Serial µC
µP
Supervisor
IC
TxD
RTS
DTR
RxD
CTS
DSR
DCD
RI
VCC
VIN
RESET


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