MAX3222ECPN View Datasheet(PDF) - Maxim Integrated

Part Name

Description

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MAX3222ECPN

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,Up to 1Mbps, True RS-232 Transceivers

Maxim Integrated 

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

Up to 1Mbps, True RS-232 Transceivers

Transmitter Outputs Recovering

from Shutdown

Figure 3 shows two transmitter outputs recovering from

shutdown mode. As they become active, the two trans-

mitter outputs are shown going to opposite RS-232 levels

(one transmitter input is high; the other is low). Each

transmitter is loaded with 3kΩ in parallel with 2500pF.

The transmitter outputs display no ringing or undesir-

able transients as they come out of shutdown. Note that

the transmitters are enabled only when the magnitude

of V- exceeds approximately -3.0V.

Mouse Drivability

The MAX3241E is designed to power serial mice while

operating from low-voltage power supplies. It has

been tested with leading mouse brands from manu-

facturers such as Microsoft and Logitech. The

MAX3241E successfully drove all serial mice tested

and met their current and voltage requirements.

VCC

0.1µF

VCC

C1+

V+

C1

C1-

MAX3222E

C2+

MAX3232E

V-

C2

MAX3237E

C2-

MAX3241E

MAX3246E

T_ IN

T_ OUT

R_ OUT

R_ IN

5kΩ

C3

C4

1000pF

T1IN

5V/div

T1OUT

5V/div

R1OUT

VCC = 3.3V, C1–C4 = 0.1µF

2µs/div

5V/div

Figure 9. MAX3241E Loopback Test Result at 250kbps

GND

Figure 7. Loopback Test Circuit

T1IN

5V/div

+5V

0

+5V

0

-5V

VCC = 3.3V

+5V

C1–C4 = 0.1µF

0

T_IN

T_OUT

5kΩ + 250pF

R_OUT

T1OUT

R1OUT

VCC = 3.3V

C1–C4 = 0.1µF

5V/div

5V/div

400ns/div

Figure 10. MAX3237E Loopback Test Result at 1000kbps

(MBAUD = VCC)

2µs/div

Figure 8. MAX3241E Loopback Test Result at 120kbps

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