MAX4644EUT(2000) 查看數據表（PDF） - Maxim Integrated

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MAX4644EUT
(Rev.:2000)

High-Speed, Low-Voltage, 4Ω, SPDT CMOS Analog Switch

Maxim Integrated 

High-Speed, Low-Voltage, 4Ω,

SPDT CMOS Analog Switch

V+

N0, NC

COM

GND

Figure 1. Overvoltage Protection Using External Blocking

Diodes

Applications Information

The MAX4644 operates from a single supply ranging

from +1.8V to +5.5V. The device is guaranteed to be

functional over that supply range, but TTL/CMOS com-

patibility is only valid for operation using a +5V supply.

All voltage levels are referenced to GND. Positive and

negative DC analog inputs or AC signals can be

accommodated by shifting V+ and GND.

ESD-protection diodes are internally connected

between each analog-signal pin and both V+ and GND.

One of these diodes conducts if any analog signal

exceeds V+ or GND (Figure 1). Virtually all of the ana-

log leakage current comes from the ESD diodes to V+

or GND. Although the ESD diodes on a given signal pin

are identical, and therefore fairly well balanced, they

are reverse biased differently. Each is biased by either

V+ or GND and the analog signal. This means their

leakages will vary as the signal varies. The difference in

the two diode leakages to the V+ and GND pins consti-

tutes the analog-signal-path leakage current. All analog

leakage current flows between each pin and one of the

supply terminals, not to the other switch terminal. This is

why both sides of a given switch can show leakage cur-

rents of the same or opposite polarity.

There is no normal current path between the analog-

signal paths and V+ or GND. V+ and GND also power

the internal logic and logic-level translators. The logic-

level translators convert the logic level into switched V+

and GND signals to drive the analog signal gates.

Chip Information

TRANSISTOR COUNT: 105

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