SP230ACP SIPEX [Sipex Corporation], SP230ACP Datasheet - Page 6

• Manufacturer Part Number: SP230ACP
• Description: +5V Powered Multi-Channel RS-232 Drivers/Receivers
• Manufacturer: SIPEX [Sipex Corporation]

FEATURES…
The multi–channel RS-232 line drivers/receivers pro-
vides a variety of configurations to fit most communi-
cation needs, especially those applications where
SP236A/B, SP240A/B, and SP241A/B feature a
shutdown mode which reduces device power dissipa-
tion to less than 5 W. All feature low power CMOS
operation, which is particularly beneficial in battery-
powered systems. The SP235A/B use no external
components and are ideally suited where printed
circuit board space is limited.
All products in the Series, except the SP239A, include
two charge pump voltage converters which allow
them to operate from a single +5V supply. These
converters convert the +5V input power to the
The SP239A is designed to operate from +5V and
+12V supplies. An internal charge pump converter
produces the necessary –12V supply. All drivers
and receivers meet all EIA RS-232D and CCITT
V.28 specifications.
The Series are available for use over the commer-
cial, industrial and military temperature ranges.
They are packaged in plastic and ceramic DIP, and
SOIC packages. For product processed and
screened to MIL–M–38510 and MIL–STD–883C
requirements, please consult the factory.
Table 1. EIA Standards Definition
SP30A/234A/235A/236A/237A/238A/239A/
SP241A/235B/236B/240A/240B/241A/241B
12V is not available. The SP230A, SP235A/B,
10V needed to generate the RS-232 output levels.
+5V Powered Multi-Channel RS-232 Drivers/Receivers
20kbps
6
100kbps
THEORY OF OPERATION
The SP230A/B–241A/B series devices are made up
of three basic circuit blocks – 1) transmitter, 2) receiver
and 3) charge pump. Each model within the series
incorporates variations of these circuits to achieve the
desired configuration and performance.
Driver/Transmitter
The drivers are inverting transmitters, which accept
TTL or CMOS inputs and output the RS-232 signals
with an inverted sense relative to the input logic levels.
Typically the RS-232 output voltage swing is 9V.
Even under worst-case loading conditions of 3k and
2500pF, the output is guaranteed to be 5V, which is
consistent with the RS-232 standard specifications.
The transmitter outputs are protected against infi-
nite short-circuits to ground without degradation
in reliability.
The drivers of the SP230A, SP235A/B, SP236A/B,
SP240A/B and SP241A/B can be tri-stated by using
the SHUTDOWN function. In this “power-off” state,
the output impedance will remain greater than 300
Ohms, again satisfying the RS-232 specifications.
Should the input of the driver be left open, an internal
400k pull–up resistor to V
thus committing the output to a low state.
The slew rate of the transmitter output is internally
limited to a maximum of 30V/ s in order to meet the
10Mbps
© Copyright 2000 Sipex Corporation
10Mbps
CC
forces the input high,
64kbps