SP3232EBCN-L Exar Corporation, SP3232EBCN-L Datasheet - Page 8

• Manufacturer Part Number: SP3232EBCN-L
• Description: IC TXRX RS232 ESD TRUE 16NSOIC
• Manufacturer: Exar Corporation
• Type: Transceiverr

Specifications of SP3232EBCN-L

• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 0.3 mA
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: SMD/SMT
• Device Type: Driver / Receiver
• Ic Interface Type: RS232
• No. Of Drivers: 2
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: SOIC
• No. Of Pins: 16
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 1016-1095-5

The SP3222EB/SP3232EB transceivers
meet the EIA/TIA-232 and ITU-T V.28/V.24
communication protocols and can be imple-
mented in battery-powered, portable, or
hand-held applications such as notebook
or palmtop computers. The SP3222EB/
SP3232EB devices feature Exar's propri-
etary on-board charge pump circuitry that
generates ±5.5V for RS-232 voltage levels
from a single +3.0V to +5.5V power supply.
This series is ideal for +3.3V-only systems,
mixed +3.3V to +5.5V systems, or +5.0V-only
systems that require true RS-232 perfor-
mance. The SP3222EB/SP3232EB devices
can operate at a data rate of 250kbps when
fully loaded.
The SP3222EB and SP3232EB are
driver/2- receiver devices ideal for portable
or hand-held applications. The SP3222EB
features a 1µA shutdown mode that reduces
power consumption and extends battery life
in portable systems. Its receivers remain
active in shutdown mode, allowing external
devices such as modems to be monitored
using only 1µA supply current.
THEORY OF OPERATION
The SP3222EB/SP3232EB series is made
up of three basic circuit blocks:
1. Drivers
2. Receivers
3. The Exar proprietary charge pump
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 with-
out degradation in reliability. Driver outputs
will meet EIA/TIA-562 levels of +/-3.7V with
supply voltages as low as 2.7V.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
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The drivers can guarantee a data rate of
250kbps fully loaded with 3kΩ in parallel
with 1000pF, ensuring compatability with
PC-to-PC communication software.
The slew rate of the driver is internally limited
to a maximum of 30V/µs in order to meet the
EIA standards (EIA RS-232D 2.1.7, Para-
graph 5). The transition of the loaded output
from HIGH to LOW also meet the monotonic-
ity requirements of the standard.
Figure 10 shows a loopback test circuit
used to test the RS-232 Drivers. Figure
11 shows the test results of the loopback
circuit with all drivers active at 120kbps
with RS-232 loads in parallel with a
1000pF capacitor. Figure 12 shows the
test results where one driver was active
at 250kbps and all drivers loaded with an
RS-232 receiver in parallel with 1000pF
capacitors. A solid RS-232 data transmis-
sion rate of 250kbps provides compatibility
with many designs in personal computer
peripherals and LAN applications.
The SP3222EB driver's output stages are
turned off (tri-state) when the device is in
shutdown mode. When the power is off, the
SP3222EB device permits the outputs to be
driven up to +/-12V. The driver's inputs do
not have pull-up resistors. Designers should
connect unused inputs to Vcc or GND.
In the shutdown mode, the supply current
falls to less than 1µA, where SHDN = LOW.
When the SP3222EB device is shut down,
the device's driver outputs are disabled (tri-
stated) and the charge pumps are turned off
with V+ pulled down to Vcc and V- pulled to
GND. The time required to exit shutdown is
typically 100µs. Connect SHDN to Vcc if the
shutdown mode is not used.
SP3222EB/SP3232EB_100_090909
DESCRIPTION