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

VCC

0.1µF

C1+

VCC

V+

C1

C1-

MAX3384E

C2+

V-

C2

C2-

T_ IN

T_ OUT

R_ OUT

R_ IN

C3

3kΩ

C4

5kΩ

VCC

SHDN

GND

3kΩ

2500pF

VCC

0.1µF

C1+

VCC

V+

C1

C1-

MAX3384E

C2+

V-

C2

C2-

T_ IN

T_ OUT

R_ OUT

R_ IN

C3

3kΩ

C4

5kΩ

VCC

SHDN

GND

7kΩ

150pF

MINIMUM SLEW-RATE TEST CIRCUIT

MAXIMUM SLEW-RATE TEST CIRCUIT

Figure 1. Slew-Rate Test Circuits

_______________Detailed Description

Dual Charge-Pump Voltage Converter

The MAX3384E’s internal power supply consists of a

regulated dual charge pump that provides output volt-

ages of +5.5V (doubling charge pump) and -5.5V

(inverting charge pump), over the +3.0V to +5.5V VCC

range. The charge pump operates in discontinuous

mode; if the output voltages are less than 5.5V, the

charge pump is enabled, and if the output voltages

exceed 5.5V, the charge pump is disabled. Each

charge pump requires a flying capacitor (C1, C2) and a

reservoir capacitor (C3, C4) to generate the V+ and V-

supplies (Figure 1).

RS-232 Transmitters

The transmitters are inverting level translators that con-

vert CMOS-logic levels to ±5.0V EIA/TIA-232 levels.

The MAX3384E transmitters guarantee a 250kbps data

rate with worst-case loads of 3kΩ in parallel with 1000pF,

providing compatibility with PC-to-PC communication

software (such as LapLink™). Transmitters can be paral-

leled to drive multiple receivers or mice.

Laplink is a trademark of Traveling Software.

The MAX3384E’s transmitters are disabled and the out-

puts are forced into a high-impedance state when the

device is in shutdown (SHDN = GND). The MAX3384E

permits the outputs to be driven up to ±12V in shut-

down.

The transmitter inputs do not have pullup resistors.

Connect unused inputs to GND or VCC.

RS-232 Receivers

The receivers convert RS-232 signals to CMOS-logic

output levels (Table 1). The receiver outputs are forced

into a high-impedance state when the device is in shut-

down (SHDN = GND). This allows a single UART to

multiplex between different protocols.

Shutdown Mode

Supply current falls to less than 1µA in shutdown mode

(SHDN = low). When shut down, the device’s charge

Table 1. Shutdown Truth Table

SHDN

0

T_OUT

High-Z

R_OUT

High-Z

1

Active

Active

_______________________________________________________________________________________ 5

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