MAX3190E データシートの表示（PDF） - Maxim Integrated

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MAX3190E

±15kV ESD-Protected, 460kbps, RS-232 Transmitters in SOT23-6

Maxim Integrated 

±15kV ESD-Protected, 460kbps,

RS-232 Transmitters in SOT23-6

IP 100%

90%

Ir

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

AMPERES

36.8%

10%

0

0 tRI

TIME

tDL

CURRENT WAVEFORM

Figure 3. Human Body Model Current Waveform

RC

50MΩ TO 100MΩ

CHARGE-CURRENT

LIMIT RESISTOR

RD

330Ω

DISCHARGE

RESISTANCE

HIGH-

VOLTAGE

DC

SOURCE

Cs

150pF

STORAGE

CAPACITOR

DEVICE

UNDER

TEST

Figure 4. IEC 1000-4-2 ESD Test Model

I

100%

90%

shows the current waveform for the ±8kV IEC 1000-4-2

Level 4 ESD Contact Discharge test. The Air-Gap test

involves approaching the device with a charged probe.

The Contact Discharge method connects the probe to

the device before the probe is energized.

Power-Supply Decoupling

In most circumstances, 0.1µF bypass capacitors are

adequate for power-supply decoupling. Connect the

bypass capacitors as close to the IC as possible.

Applications Information

Power-Supply Sources

The MAX3190/MAX3190E require ±7.5V to ±12V dual

supplies. For applications where these supply voltages

are not present, a DC-DC converter must be added.

Due to the MAX3190/MAX3190E’s low current con-

sumption, a charge pump can provide the proper supply

voltages and requires a minimal amount of board

space and cost.

When using another RS-232 device containing an internal

unregulated charge pump (Tables 1 and 2), the

MAX3190/MAX3190E may be powered from the internal

charge pump (Figure 6). This eliminates the need for

additional external DC-DC converters to generate the

required ±7.5V to ±12V dual supplies. The MAX3190/

MAX3190E are specifically designed to be used with

Maxim’s RS-232 products listed in Tables 1 and 2.

Competitive RS-232 devices’ charge pumps typically

do not have the capability to power these devices.

The MAX3190/MAX3190E can be operated from ±6V to

±7.5V supplies. In this condition, the devices are guar-

anteed to be RS-232-compatible (TOUT ≥ +3.7V).

For applications that have ±4.5V to ±6V supplies avail-

able, please refer to the MAX3188/MAX3189 or

MAX3188E/MAX3189E data sheet.

10%

tR = 0.7ns TO 1ns

30ns

t

60ns

Figure 5. IEC 1000-4-2 Generator Current Waveform

_______________________________________________________________________________________ 5

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