MAX3232CSE(1999) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX3232CSE
(Rev.:1999)

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors

Maxim Integrated 

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232

Transceivers Using Four 0.1µF External Capacitors

VCC

0.1µF

C1+

C1

C1-

C2+

C2

C2-

T_ IN

VCC

V+

MAX3222

MAX3232

MAX3237

MAX3241

V-

T_ OUT

R_ OUT

0V

EN*

R_ IN

5k

VCC

SHDN*

GND

* MAX3222/MAX3241 ONLY

C3

C4

1000pF

T1IN

T1OUT

R1OUT

5V/div

5V/div

5V/div

VCC = 3.3V

5µs/div

Figure 6. MAX3241 Loopback Test Result at 120kbps

T1IN

T1OUT

R1OUT

5V/div

5V/div

5V/div

Figure 5. Loopback Test Circuit

High Data Rates

The MAX3222/MAX3232/MAX3241 maintain the RS-232

±5.0V minimum transmitter output voltage even at high

data rates. Figure 5 shows a transmitter loopback test

circuit. Figure 6 shows a loopback test result at

120kbps, and Figure 7 shows the same test at 235kbps.

For Figure 6, all transmitters were driven simultaneously

at 120kbps into RS-232 loads in parallel with 1000pF.

For Figure 7, a single transmitter was driven at 235kbps,

and all transmitters were loaded with an RS-232 receiver

in parallel with 1000pF.

The MAX3237 maintains the RS-232 ±5.0V minimum

transmitter output voltage at data rates up to 1Mbps.

Figure 8 shows a loopback test result at 1Mbps with

MBAUD = VCC. For Figure 8, all transmitters were

loaded with an RS-232 receiver in parallel with 250pF.

VCC = 3.3V

2µs/div

Figure 7. MAX3241 Loopback Test Result at 235kbps

+5V

0V

T_IN

+5V

0V

T_OUT = R_IN

-5V

5k + 250pF

+5V

0V

R_OUT

150pF

VCC = 3.3V

200ns/div

Figure 8. MAX3237 Loopback Test Result at 1000kbps

(MBAUD = VCC)

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