MAX3232ECAE datasheet(13/22 Pages) AD

13 / 22 page

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

Applications Information

Capacitor Selection

The capacitor type used for C1–C4 is not critical for

proper operation; polarized or nonpolarized capacitors

can be used. The charge pump requires 0.1µF capaci-

tors for 3.3V operation. For other supply voltages, see

Table 2 for required capacitor values. Do not use val-

ues smaller than those listed in Table 2. Increasing the

capacitor values (e.g., by a factor of 2) reduces ripple

on the transmitter outputs and slightly reduces power

consumption. C2, C3, and C4 can be increased without

changing C1’s value. However, do not increase C1

without also increasing the values of C2, C3, C4,

and CBYPASS to maintain the proper ratios (C1 to

the other capacitors).

When using the minimum required capacitor values,

make sure the capacitor value does not degrade

excessively with temperature. If in doubt, use capaci-

tors with a larger nominal value. The capacitor’s equiv-

alent series resistance (ESR), which usually rises at low

temperatures, influences the amount of ripple on V+

and V-.

Power-Supply Decoupling

In most circumstances, a 0.1µF VCC bypass capacitor

is adequate. In applications sensitive to power-supply

noise, use a capacitor of the same value as charge-

pump capacitor C1. Connect bypass capacitors as

close to the IC as possible.

Operation Down to 2.7V

Transmitter outputs meet EIA/TIA-562 levels of ±3.7V

with supply voltages as low as 2.7V.

MAX3241E

R5OUT

R4OUT

R3OUT

R2OUT

R1OUT

R2OUTB

R1OUTB

Ω

R5IN

VCC

R4IN

R2IN

R1IN

SHDN

GND

T3IN

T2IN

T1IN

C2-

C2+

C1-

C1+

T3OUT

COMPUTER SERIAL PORT

-V

GND

T2OUT

T1OUT

V-

V+

VCC

CBYPASS

VCC = +3.0V TO +5.5V

R3IN

MOUSE

Figure 6b. Mouse Driver Test Circuit

Maxim Integrated

MAX3222E/MAX3232E/MAX3237E/

MAX3241E/MAX3246E

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