®
SP3281EB
Intelligent +2.35V to +5.5V RS-232 Transceivers
■
Operates over entire Li+ Battery range
■
Interoperable with EIA/TIA-232-F and
adheres to EIA/TIA-562 down to a
+2.35V power supply
■
AUTO ON-LINE
®
circuitry automatically
wakes up from a 1µA shutdown
■
Minimum 250Kbps data rate
■
Regulated charge pump yields stable
RS-232 outputs regardless of V
CC
variations
■
Unique V
L
for low logic compatibility
regardless of V
CC
■
Enhanced ESD Specifications:
+15kV Human Body Model
+15kV IEC1000-4-2 Air Discharge
+8kV IEC1000-4-2 Contact Discharge
■
Enhanced battery life as the V
CC
drops
below 3.1V
C2+
1
GND
2
C2-
3
V-
4
28
C1+
27
V+
26
V
CC
25
C1-
T1OUT
5
T2OUT
6
T3OUT
7
R1IN
8
R2IN
9
SP3281EB
24
T1IN
23
T2IN
22
T3IN
21
R1OUT
20
R2OUT
19
T4IN
18
T4OUT
10
R3IN
11
R3OUT
T5IN
VL
T5OUT
12
ONLINE
13
SHUTDOWN
14
17
16
15
STATUS
APPLICATIONS
■
Cell phone data cables
■
PDAs, PDA cradles
■
Hand held equipment
■
Peripherals
DESCRIPTION
The SP3281EB device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers, PDAs, cell phones and their data cables
and cradles.
The SP3281EB is compatible with low voltage logic down to 1.8V using a logic select pin (VL)
which conditions the logic inputs and outputs to be compatible with system logic.
The SP3281EB uses an internal high-efficiency, charge-pump power supply that requires only
0.1µF capacitors in 3.3V operation. This charge pump and Sipex's driver architecture allow the
SP3281EB device to deliver compliant RS-232 performance from a single +3.3V to +5.5Vpower
supply and additionally adhere to EIA/TIA-562 driver outputs levels down to a power supply
voltage of 2.35V.
The
AUTO ON-LINE
®
feature allows the device to automatically "wake-up" during a shutdown
state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise,
the device automatically shuts itself down drawing less than 1µA.
TABLE 1
Device
SP3281EB
Power
Supplies
2.35V to 5.5V
RS-232
Drivers
5
RS232
Receivers
3
External
AUTO ON-LINE
®
Components
Circuitry
4
yes
Data
No. of
Rate
Pins
250kbps 28
Applicable U.S. Patents - 5,306,954; and 6,378,026.
Rev. 6/19/03
SP3281EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2003 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
