SP3223UCA datasheet(11/24 Pages) SIPEX

Part #	SP3223UCA

Description	High Speed 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 / 24 page

Date: 5/25/04

SP3223U/3243U +3.0V to +5.5V RS-232 Transceivers

11

Figure 17 shows a loopback test circuit used to

test the RS-232 Drivers. Figure 18 shows the test

results where one driver was active at 1Mbps and

all three drivers loaded with an RS-232 receiver

in parallel with a 250pF capacitor. Figure 19

shows the test results of the loopback circuit with

all drivers active at 250kbps with typical

RS-232 loads in parallel with 1000pF capacitors. A

superior RS-232 data transmission rate of 1Mbps

makes the SP3223U/3243U series an ideal match

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 17. Loopback Test Circuit for RS-232 Driver

Data Transmission Rates

for high speed LAN and personal computer

peripheral applications.

Receivers

The receivers convert +5.0V EIA/TIA-232

levels to TTL or CMOS logic output levels. The

SP3223U receivers have an inverting output that

can be disabled by using the EN pin.

Figure 18. Loopback Test results at 1Mbps

Figure 19. Loopback Test results at 250Kbps

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SP3223U

SP3243U

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

SHUTDOWN

5kΩ

R

1OUT

5kΩ

R

XIN

R

XOUT

TTL/CMOS

OUTPUTS

EN *

ONLINE

R

1IN

T

XOUT

T

1OUT

STATUS

VCC

To µP Supervisor

Circuit

1000pF

*

SP3223EU Only

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