SP3243B datasheet(11/24 Pages) SIPEX

11 / 24 page

Rev. 6/30/03

SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers

The SP3223B and SP3243B drivers can main-

tain high data rates up to 250kbps fully loaded.

Figure 17. shows a loopback test circuit used to

test the SP3243B RS-232 Drivers. Figure 18

shows the test results of the loopback circuit with

all three drivers active at 120kbps with typical

RS-232 loads in parallel with 1000pF capacitors.

Figure 19 shows the test results where one driver

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

was active at 250kbps and all three drivers loaded

with an RS-232 receiver in parallel with a 1000pF

capacitor. A solid RS-232 data transmission

rate of 250kbps provides compatibility with many

designs in personal computer peripherals and

LAN applications.

Receivers

The receivers convert

±5.0V EIA/TIA-232

levels to TTL or CMOS logic output levels. All

receivers have an inverting output that can be

disabled by using the EN pin.

Figure 18. Loopback Test Circuit All Drivers at 120kbps

Figure 19. Loopback Test Circuit One Driver at 250kbps

SP3223B

SP3243B

GND

1IN

XIN

C1+

C1-

C2+

C2-

V+

V-

VCC

0.1µF

TTL/CMOS

INPUTS

+3V to +5V

SHUTDOWN

5kΩ

1OUT

5kΩ

XIN

XOUT

TTL/CMOS

OUTPUTS

ONLINE

1IN

XOUT

1OUT

STATUS

VCC

To µP Supervisor

Circuit

1000pF

DEVICE: SP3223B

SHUTDOWN

TXOUT

RXOUT

High Z

Active

High Z

Active

High Z

DEVICE: SP3243B

SHUTDOWN

TXOUT

RXOUT

R2OUT

High Z

Active

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