SP3223EBCA-L/TR Exar Corporation, SP3223EBCA-L/TR Datasheet - Page 15

• Manufacturer Part Number: SP3223EBCA-L/TR
• Description: Intelligent +3.0V To +5.5V RS-232 Transceivers
• Manufacturer: Exar Corporation
• Type: Transceiverr

Specifications of SP3223EBCA-L/TR

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The Exar-patented charge pump is designed
to operate reliably with a range of low cost
capacitors.Either polarized or non polar-
ized capacitors may be used. If polarized
capacitors are used they should be oriented
as shown in the Typical Operating Circuit.
The V+ capacitor may be connected to either
ground or Vcc (polarity reversed.)
The charge pump operates with 0.µF ca-
pacitors for 3.3V operation. For other supply
voltages, see the table for required capacitor
values. Do not use values smaller than those
listed. Increasing the capacitor values (e.g.,
by doubling in value) reduces ripple
Minimum recommended charge pump capacitor value
Input Voltage V
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com
3.0V to 3.6V
4.5V to 5.5V
3.0V to 5.5V
CC
5
on the transmitter outputs and may slightly
reduce power consumption. C2, C3, and
C4 can be increased without changing
C’s value
For best charge pump efficiency locate the
charge pump and bypass capacitors as
close as possible to the IC. Surface mount
capacitors are best for this purpose. Using
capacitors with lower equivalent series re-
sistance (ESR) and self-inductance, along
with minimizing parasitic PCB trace induc-
tance will optimize charge pump operation.
Designers are also advised to consider that
capacitor values may shift over time and
operating temperature.
Charge pump capacitor value
C - C4 = 0.µF
C = 0.047µF, C2-C4 = 0.33µF
C - C4 = 0.22µF
SP3223E/EB/EU_00_20