MAX202E Просмотр технического описания (PDF) - Maxim Integrated

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MAX202E

±15kV ESD-Protected, 5V RS-232 Transceivers

Maxim Integrated 

MAX202E–MAX213E,

MAX232E/MAX241E

±15kV ESD-Protected,

5V RS-232 Transceivers

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

approximately 0.5V hysteresis, except in shutdown,

when receivers 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

assembly. The driver outputs and receiver inputs have

extra protection against static electricity. Maxim’s engi-

neers 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

transmitter 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 inter-

MAX211E

3V

SHDN

0V

10V

V+

5V

0V

V-

-5V

-10V

200μs/div

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

capacitors)

Table 1a. MAX205E/MAX206E/MAX211E/

MAX241E Control Pin Configurations

SHDN

EN

OPERATION

STATUS

0

0

Normal

Operation

0

1

Normal

Operation

Tx

All Active

All Active

Rx

All Active

All High-Z

1 X Shutdown All High-Z

All High-Z

X = Don't care.

Table 1b. MAX213E Control Pin

Configurations

SHDN

EN

OPERATION

STATUS

Tx 1–4

Rx

1–3

4, 5

0 0 Shutdown All High-Z High-Z High-Z

0 1 Shutdown All High-Z High-Z

1

0

Normal

Operation

All Active High-Z

1

1

Normal

Operation

All Active Active

*Active = active with reduced performance

Active*

High-Z

Active

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