MAX3384E 查看數據表（PDF） - Maxim Integrated

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MAX3384E

±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver

Maxim Integrated 

±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,

up to 250kbps, True RS-232 Transceiver

Transmitter Outputs when

Exiting Shutdown

Figure 2 shows two transmitter outputs when exiting

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

mitter outputs are shown going to opposite RS-232 lev-

els (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 -3V.

High Data Rates

The MAX3384E maintains the RS-232 ±5.0V minimum

transmitter output voltage even at high data rates.

Figure 6 shows a transmitter loopback test circuit.

Figure 7 shows a loopback test result at 120kbps, and

Figure 8 shows the same test at 250kbps. For Figure 7,

all transmitters were driven simultaneously at 120kbps

into RS-232 loads in parallel with 1000pF. For Figure 8,

a single transmitter was driven at 250kbps, and all

transmitters were loaded with an RS-232 receiver in

parallel with 1000pF.

VCC

0.1µF

C1+

C1

C1-

VCC

V+

C2+

MAX3384E

V-

C2

C2-

T_ IN

T_ OUT

R_ OUT

R_ IN

5kΩ

VCC

SHDN

GND

Figure 6. Loopback Test Circuit

C3

C4

1000pF

T1IN

5V/div

T1OUT

5V/div

R1OUT

VCC = 3.3V

C1–C4 = 0.1µF

2µs/div

5V/div

Figure 7. MAX3384E Loopback Test Result at 120kbps

T1IN

T1OUT

5V/div

5V/div

R1OUT

VCC = 3.3V

C1–C4 = 0.1µF

2µs/div

5V/div

Figure 8. MAX3384E Loopback Test Result at 250kbps

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