SP3223CA datasheet(11/23 Pages) SIPEX

Part #	SP3223CA

Description	Intelligent 3.0V to 5.5V RS-232 Transceivers

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Manufacturer	SIPEX [Sipex Corporation]

Direct Link	http://www.sipex.com

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11 / 23 page

11

Rev. 6/30/03

SP3223 +3.0V to +5.5V RS-232 Transceivers

Figure 12 shows a loopback test circuit used to

test the RS-232 Drivers. Figure 13 shows the test

results of the loopback circuit with all three

drivers active (SP3243) at 120Kbps with typical

RS-232 loads in parallel with 1000pF capacitors.

Figure 14 shows the test results where one driver

was active at 235Kbps and all three drivers

loaded with an RS-232 receiver in parallel with

a 1000pF capacitor. A solid RS-232 data trans-

Table 2. SHUTDOWN and EN Truth Tables

Note: In AUTO ON-LINE® Mode where ONLINE =

GND and SHUTDOWN = V

CC, the device will shut down

if there is no activity present at the Receiver inputs.

Figure 12. Loopback Test Circuit for RS-232 Driver

Data Transmission Rates

mission rate of 120Kbps provides compatibility

with many designs in personal computer periph-

erals and LAN applications.

Receivers

The receivers convert

±5.0V EIA/TIA-232

levels to TTL or CMOS logic output levels.

Receivers have an inverting output that can be

disabled by using the EN pin.

Figure 13. Loopback Test Circuit Result at 120Kbps

(All Drivers Fully Loaded)

Figure 14. Loopback Test Circuit result at 235Kbps

(All Drivers Fully Loaded)

SP3223

SP3243

2

4

6

5

3

7

19

GND

T

1IN

T

XIN

C1+

C1-

C2+

C2-

V+

V-

VCC

0.1µF

+

C2

C5

C1

+

C3

C4

+

0.1µF

TTL/CMOS

INPUTS

+3V to +5V

18

SHUTDOWN

20

5KΩ

R

1OUT

5KΩ

R

XIN

R

XOUT

TTL/CMOS

OUTPUTS

EN

1

ONLINE

14

R

1IN

T

XOUT

T

1OUT

11

STATUS

VCC

To µP Supervisor

Circuit

1000pF

3

2

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T1 IN

T1 OUT

R1 OUT

T1 IN

T1 OUT

R1 OUT

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SP3223CA Datasheet(PDF) 11 Page - Sipex Corporation

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