MAX211CSLASHD datasheet(5/23 Pages) MAXIM

5 / 23 page

+5V, RS-232 Transceivers

with 0.1µF External Capacitors

Detailed Description

The MAX200–MAX209/MAX211/MAX213 consist of

three sections: charge-pump voltage converters, drivers

(transmitters), and receivers. Each section is described

in detail.

+5V to ±10V Dual Charge-Pump

Voltage Converter

The +5V to Q10V conversion is performed by two

charge-pump voltage converters (Figure 4). The first

uses capacitor C1 to double +5V to +10V, storing +10V

on the V+ output filter capacitor, C3. The second charge-

pump voltage converter uses capacitor C2 to invert +10V

to -10V, storing -10V on the V- output filter capacitor, C4.

The MAX201 and MAX209 include only the V+ to V-

charge pump, and are intended for applications that

have a VCC = +5V supply and a V+ supply in the +9V to

+13.2V range.

In shutdown mode, V+ is internally connected to VCC by

a 1kI pulldown resistor and V- is internally connected to

ground by a 1kI pullup resistor.

RS-232 Drivers

When VCC = +5V, the typical driver output-voltage swing

is Q8V when loaded with a nominal 5kI RS-232 receiver.

The output swing is guaranteed to meet the EIA/TIA-232E

and V.28 specifications, which call for Q5V minimum out-

put levels under worst-case conditions. These include

a minimum 3kI load, VCC = +4.5V, and the maximum

operating temperature. The open-circuit output-voltage

swing ranges from (V+ - 0.6V) to V-.

Input thresholds are both CMOS and TTL compatible.

The inputs of unused drivers can be left unconnected

since 400kI pullup resistors to VCC are included on-

chip. Since all drivers invert, the pullup resistors force

the outputs of unused drivers low. The input pullup resis-

tors typically source 15µA; therefore, the driver inputs

should be driven high or open circuited to minimize

power-supply current in shutdown mode.

When in low-power shutdown mode, the driver outputs

are turned off and their leakage current is less than 1mA,

even if the transmitter output is backdriven between 0V

and (VCC + 6V). Below -0.5V, the transmitter output is

diode clamped to ground with a 1kI series impedance.

The transmitter output is also zener clamped to approxi-

mately (VCC + 6V), with a 1kI series impedance.

Figure 1. Shutdown Current Test Circuit

Figure 2. Receiver Output Enable and Disable Timing

ISHDN

+5.5V

+5.5V (0)

+5.5V

0V OR +5.5V

DRIVE

0.1FF

C1+

C1-

C2+

C2-

400kI

3kI

5kI

GND

VCC

V+

V-

TIN

+5.5V

T1 T0 T5

R1 T0 R5

TOUT

RIN

0.1FF

SHDN

ROUT

(SHDN)

EN (EN)

MAX200

MAX205

MAX206

MAX211

MAX213

NOTE 1: ( ) ARE FOR MAX213.

NOTE 2: CAPACITORS CAN BE POLARIZED OR UNPOLARIZED.

+3.5V

RECEIVER

OUTPUT

CL = 150pF

+0.8V

VOH - 0.1V

+ 2.5V

VOH

VOL

RL = 1kI

VOL + 0.1V

OUTPUT ENABLE TIME

RECEIVER

OUTPUTS

+3V

INPUT

OUTPUT ENABLE TIME

+3V

INPUT

NOTE: POLARITY OF EN IS REVERSED FOR THE MAX213.

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