SP3232EBCN-L Exar Corporation, SP3232EBCN-L Datasheet - Page 9

• 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

Figure 11. Loopback Test results at 120kbps
Figure 10. SP3222EB/SP3232EB Driver Loopback
Test Circuit
Figure 12. Loopback Test results at 250Kbps
OUTPUTS
INPUTS
LOGIC
LOGIC
C2
C5
C1
+
+
+
0.1µF
0.1µF
0.1µF
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
C1+
C2+
C2-
TxIN
C1-
RxOUT
EN*
SP3222EB
SP3232EB
V
V
GND
CC
CC
5kΩ
*SHDN
TxOUT
* SP3222EB only
RxIN
V+
V-
1000pF
V
C3
C4
CC
+
+
0.1µF
0.1µF
9
Receivers
The Receivers convert EIA/TIA-232 levels
to TTL or CMOS logic output levels. The
SP3222EB receivers have an inverting
tri-state output. These receiver outputs
(RxOUT) are tri-stated when the enable
control EN = HIGH. In the shutdown mode,
the receivers can be active or inactive. EN
has no effect on TxOUT. The truth table logic
of the SP3222EB driver and receiver outputs
can be found in Table 2.
Since receiver input is usually from a trans-
mission line where long cable lengths and
system interference can degrade the signal,
the inputs have a typical hysteresis margin
of 300mV. This ensures that the receiver
is virtually immune to noisy transmission
lines. Should an input be left unconnected,
an internal 5KΩ pulldown resistor to ground
will commit the output of the receiver to a
HIGH state.
Table 2. SP3222EB Truth Table Logic for Shutdown
and Enable Control
Charge Pump
The charge pump is an Exar-patended
design (U.S. 5,306,954) and uses a unique
approach compared to older less-efficient
designs. The charge pump still requires four
external capacitors, but uses a four-phase
voltage shifting technique to attain sym-
metrical 5.5V power supplies. The internal
power supply consists of a regulated dual
charge pump that provides output voltages
of +/-5.5V regardless of the input voltage
(Vcc) over the +3.0V to +5.5V range.
SHDN
0
0
1
1
EN
0
1
0
1
Tri-state
Tri-state
TxOUT
SP3222EB/SP3232EB_100_090909
Active
Active
DESCRIPTION
Tri-state
Tri-state
RxOUT
Active
Active