MAX211CSLASHD datasheet(6/23 Pages) MAXIM

6 / 23 page

+5V, RS-232 Transceivers

with 0.1µF External Capacitors

RS-232 Receivers

The receivers convert RS-232 signals to CMOS logic

output levels. Receiver outputs are inverting, maintain-

ing compatibility with driver outputs. The guaranteed

receiver input thresholds of +0.8V and +2.4V are signifi-

cantly tighter than the Q3.0V threshold required by the

EIA/TIA-232E specification. This allows receiver inputs

to respond to TTL/CMOS logic levels and improves noise

margin for RS-232 levels.

The MAX200–MAX209/MAX211/MAX213 guaranteed

+0.8V threshold (+0.6V in shutdown for the MAX213)

ensures that receivers shorted to ground have a logic 1

output. Also, the 5kI input resistance to ground ensures

that a receiver with its input left open also has a logic 1

output.

Receiver inputs have approximately +0.5V hysteresis.

This provides clean output transitions, even with slow

rise and fall time input signals with moderate amounts of

noise and ringing. In shutdown, the MAX213 receivers

R4 and R5 have no hysteresis.

Figure 3. Transition Slew-Rate Test Circuit

Figure 4. Dual Charge-Pump Diagram

+5V

0V (+5V)

0.1FF

C1+

C1-

C2+

C2-

400kI

3kI

2500pF

5kI

VCC

V+

V-

TIN

+5V

T1 T0 T5

R1 T0 R5

TOUT

RIN

0.1FF

ROUT

SHDN (SHDN)

EN (EN)

MAX200-MAX209

MAX211

MAX213

+5V

0V (+5V)

MAXIMUM SLEW-RATE

TEST CIRCUIT

MINIMUM SLEW-RATE

TEST CIRCUIT

NOTE: ( ) ARE FOR MAX213.

0V (+5V)

0.1FF

C1+

C1-

C2+

C2-

400kI

7kI

50pF

5kI

VCC

V+

V-

TIN

+5V

T1 T0 T5

R1 T0 R5

TOUT

RIN

0.1FF

ROUT

SHDN (SHDN)

EN (EN)

MAX200-MAX209

MAX211

MAX213

0.1FF

V+ V+

C1+

C2+

IL+

GND

RL-

V-

GND

VCC

IL-

RL+

C2-

VCC

200kHz

C1-

GND

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