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SP3282EB Datasheet(PDF) 6 Page - Sipex Corporation

Part # SP3282EB
Description  Intelligent 2.35V to 5.5V RS-232 Transceivers
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP3282EB Datasheet(HTML) 6 Page - Sipex Corporation

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Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
6
DESCRIPTION
The SP3282EB device meets the EIA/TIA-232
and ITU-T V.28/V.24 communication protocols
and can be implemented in battery-powered, por-
table, or hand-held applications such as notebook
or palmtop computers. The SP3282EB device
features 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 +3.3V to +5.5V power supply. The
SP3282EB will adhere to EIA/TIA-562 voltage
levels with V
CC as low as 2.35V.
The SP3282EB device is an ideal choice for power
sensitive designs. The SP3282EB device features
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 automati-
cally comes online. This feature allows design
engineers to address power saving concerns with-
out major design changes.
THEORY OF OPERATION
The SP3282EB device 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 ,
when V
CC is between +3.3V and +5.5V, 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-232F and all previous RS-232
versions. The driver outputs will adhere to EIA/
TIA-562 when V
CC is as low as 2.35V.
The SP3282EB drivers can guarantee a data rate of
250 kbps fully loaded with 3k
Ω in parallel with
1000pF, ensuring compatibility with PC-to-PC
communication software. All unused driver inputs
must be connected to V
L or GND.
Figure 6 shows a loopback test circuit used to test
the SP3282EB RS-232 drivers. Figure 7 shows the
test results of the loopback circuit with all five
drivers active at 120kbps with typical RS-232
loads in parallel with 1000pF capacitors. Figure 8
shows the test results where one driver was active
at 250kbps and all five drivers loaded with an RS-
232 receiver in parallel with a 1000pF capacitor. A
solid RS-232 data transmission rate of 120kbps
provides compatibility with many designs in per-
sonal computer peripherals and LAN applications.
Receivers
The receivers convert
±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels.
Receivers are not active when in shutdown. If
there is no activity present at the receivers for a
period longer than 100
µs during AUTO ON-
LINE® mode or when SHUTDOWN is enabled,
the device goes into a standby mode where the
circuit draws 1
µA. The truth table logic of the
driver and receiver outputs can be found in
Table 3.
Figure 5. Interface Circuitry Being Controlled by
Microprocessor Supervisory Circuit
SP3282EB
28
25
3
1
27
4
26
GND
C1+
C1-
C2+
C2-
V+
V-
VCC
0.1µF
0.1µF
0.1µF
+
C2
C5
C1
+
+
C3
C4
+
+
0.1µF
0.1µF
13
14
15
VCC
2
ONLINE
SHUTDOWN
STATUS
µP
Supervisor
IC
VCC
VIN
RESET
5kΩ
5kΩ
5kΩ
24
23
22
21
20
18
5
6
7
8
9
11
RS-232
OUTPUTS
RS-232
INPUTS
T
1IN
R
1OUT
R
1IN
T
2OUT
T
2IN
T
3IN
T
3OUT
T
1OUT
R
2IN
R
3IN
R
2OUT
R
3OUT
UART
or
Serial µC
TxD
RTS
DTR
RxD
CTS
DSR
DCD
RI
19
17
10
12
T
4OUT
T
4IN
T
5IN
T
5OUT
16
VL


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