MAX213C View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX213C

+5V, RS-232 Transceivers with 0.1μF External Capacitors

Maxim Integrated 

MAX200–MAX209/

MAX211/MAX213

+5V, RS-232 Transceivers

with 0.1μF External Capacitors

+5.5V

0.1µF

0.1µF

0.1µF

+5.5V

0V OR +5.5V

DRIVE

+5.5V (0)

ISHDN

0.1µF

C1+

VCC

V+

C1-

MAX200

MAX205

C2+

MAX206

V-

MAX211

C2- +5.5V MAX213

400kΩ

TIN

T1 T0 T5

TOUT

ROUT

R1 T0 R5

EN (EN)

SHDN

(SHDN)

GND

RIN

5kΩ

0.1µF

3kΩ

+5.5V

NOTE 1: ( ) ARE FOR MAX213.

NOTE 2: CAPACITORS CAN BE POLARIZED OR UNPOLARIZED.

Figure 1. Shutdown Current Test Circuit

EN

INPUT +3V

0V

OUTPUT ENABLE TIME

RECEIVER

OUTPUT

CL = 150pF

+3.5V

+0.8V

+3V

EN 0V

INPUT

OUTPUT ENABLE TIME

RECEIVER VOH

OUTPUTS VOL

VOH - 0.1V

+ 2.5V

RL = 1kΩ

VOL + 0.1V

NOTE: POLARITY OF EN IS REVERSED FOR THE MAX213.

Figure 2. Receiver Output Enable and Disable Timing

Detailed Description

The MAX200–MAX209/MAX211/MAX213 consist of three

sections: charge-pump voltage converters, drivers (trans-

mitters), and receivers. Each section is described in detail.

+5V to ±10V Dual Charge-Pump

Voltage Converter

The +5V to ±10V conversion is performed by two charge-

pump voltage converters (Figure 4). The first uses capaci-

tor C1 to double +5V to +10V, storing +10V on the V+

output filter capacitor, C3. The second chargepump volt-

age 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 Vcharge

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 1kΩ pulldown resistor and V- is internally connected to

ground by a 1kΩ pullup resistor.

RS-232 Drivers

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

is ±8V when loaded with a nominal 5kΩ RS-232 receiver.

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

and V.28 specifications, which call for ±5V minimum out-

put levels under worst-case conditions. These include

a minimum 3kΩ 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

400kΩ pullup resistors to VCC are included onchip. Since

all drivers invert, the pullup resistors force the outputs of

unused drivers low. The input pullup resistors 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 1kΩ series impedance.

The transmitter output is also zener clamped to approxi-

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

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