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high for the MAX205E/MAX206E/MAX211E/MAX241E

(SHDN), but is active low for the MAX213E (SHDN).

The MAX213E’s receiver propagation delay is typically

0.5μs in normal operation. In shutdown mode, propaga-

tion delay increases to 4μs for both rising and falling

transitions. The MAX213E’s receiver inputs have approxi-

mately 0.5V hysteresis, except in shutdown, when receiv-

ers R4 and R5 have no hysteresis.

When entering shutdown with receivers active, R4 and R5

are not valid until 80μs after SHDN is driven low. When

coming out of shutdown, all receiver outputs are invalid

until the charge pumps reach nominal voltage levels (less

than 2ms when using 0.1μF capacitors).

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures are

incorporated on all pins to protect against electro-static

discharges encountered during handling and assem-

bly. The driver outputs and receiver inputs have extra

protection against static electricity. Maxim’s engineers

developed state-of-the-art structures to protect these

pins against ESD of ±15kV without damage. The ESD

structures withstand high ESD in all states: normal

operation, shutdown, and powered down. After an ESD

event, Maxim’s E versions keep working without latchup,

whereas competing RS-232 products can latch and must

be powered down to remove latchup.

ESD protection can be tested in various ways; the trans-

mitter outputs and receiver inputs of this product family

are characterized for protection to the following limits:

1) ±15kV using the Human Body Model

2) ±8kV using the contact-discharge method specified in

IEC1000-4-2

3) ±15kV using IEC1000-4-2’s air-gap method.

ESD Test Conditions

ESD performance depends on a variety of conditions.

Contact Maxim for a reliability report that documents test

set-up, test methodology, and test results.

Human Body Model

Figure 6a shows the Human Body Model, and Figure

6b shows the current waveform it generates when dis-

charged into a low impedance. This model consists of a

100pF capacitor charged to the ESD voltage of interest,

which is then discharged into the test device through a

1.5kΩ resistor.

X = Don’t care.

*Active = active with reduced performance

Table 1a. MAX205E/MAX206E/MAX211E/

MAX241E Control Pin Configurations

Table 1b. MAX213E Control Pin

Configurations

Figure 5. MAX211E V+ and V- when Exiting Shutdown (0.1μF

capacitors)

SHDN

OPERATION

STATUS

Normal

Operation

All Active

Normal

Operation

All Active

All High-Z

Shutdown

All High-Z

SHDN EN OPERATION

STATUS

Tx 1–4

1–3

4, 5

Shutdown

All High-Z High-Z High-Z

Shutdown

All High-Z High-Z Active*

Normal

Operation

All Active High-Z High-Z

Normal

Operation

All Active Active Active

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Analog Devices │ 11

MAX202E–MAX213E,

MAX232E/MAX241E

±15kV ESD-Protected,

5V RS-232 Transceivers

V+

V-

200µs/div

10V

-5V

-10V

SHDN

MAX211E

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