MAX221EEUE 查看數據表（PDF） - Maxim Integrated

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MAX221EEUE

±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown

Maxim Integrated 

±15kV ESD-Protected, +5V, 1µA, Single RS-232

Transceiver with AutoShutdown

+2.7V

+0.3V

0

-0.3V

-2.7V

a)

TRANSMITTER ENABLED, INVALID HIGH

INDETERMINATE

AUTOSHUTDOWN, TRANSMITTER DISABLED,

1µA SUPPLY CURRENT, INVALID LOW

INDETERMINATE

TRANSMITTER ENABLED, INVALID HIGH

RECEIVER

INPUT

VOLTAGE

(V)

INVALID

REGION

VCC

INVALID

OUTPUT

(V)

0

tINVL

V+

VCC

0

V-

b)

tINVH

tWU

Figure 3. AutoShutdown Trip Levels

POWER-

MASTER SHDN LINE

MANAGEMENT

UNIT

0.1µF 1MΩ

FORCEOFF FORCEON

MAX221E

Figure 4. AutoShutdown with Initial Turn-On to Wake Up a

Mouse or Another System

Software-Controlled Shutdown

For direct software control, use INVALID to indicate a

DTR or Ring Indicator signal. Connect FORCEOFF and

FORCEON together to disable AutoShutdown so the

line acts like a SHDN input.

±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 output and receiver input of the

MAX221E have extra protection against static electrici-

ty. Maxim’s engineers have 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 output and receiver input of the MAX221E are

characterized for protection to the following limits:

1) ±15kV using the Human Body Model

2) ±8kV using the Contact-Discharge Method

specified in IEC 1000-4-2

3) ±15kV using IEC 1000-4-2’s Air-Gap Method

ESD Test Conditions

ESD performance depends on a variety of conditions.

Contact Maxim for a reliability report that documents

test setup, test methodology, and test results.

Human Body Model

Figure 5a shows the Human Body Model, and Figure

5b 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-

est, which is then discharged into the test device

through a 1.5kΩ resistor.

IEC 1000-4-2

The IEC 1000-4-2 standard covers ESD testing and

performance of finished equipment; it does not specifi-

cally refer to integrated circuits. The MAX221E helps

you design equipment that meets Level 4 (the highest

level) of IEC 1000-4-2, without the need for additional

ESD-protection components.

The major difference between tests done using the

Human Body Model and IEC 1000-4-2 (Figure 6) is

higher peak current in the IEC 1000-4-2 because series

resistance is lower in the IEC 1000-4-2 model. Hence,

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