MAX4581 データシートの表示（PDF） - Maxim Integrated

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MAX4581

Low-Voltage / CMOS Analog Multiplexers/Switches

Maxim Integrated 

Low-Voltage, CMOS Analog

Multiplexers/Switches

slightly, so when VCC reaches +12V the threshold is

about 3.1V (above the TTL-guaranteed high-level mini-

mum of 2.8V, but still compatible with CMOS outputs).

Bipolar Supplies

These devices operate with bipolar supplies between

±2V and ±5V. The VCC and VEE supplies need not be

symmetrical, but their sum cannot exceed the +13V

absolute maximum rating

Single Supply

These devices operate from a single supply between

+2V and +12V when VEE is connected to GND. All of

the bipolar precautions must be observed. At room

temperature, they actually “work” with a single supply

near or below +1.7V, although as supply voltage

decreases, switch on-resistance and switching times

become very high.

Overvoltage Protection

Proper power-supply sequencing is recommended for

all CMOS devices. Do not exceed the absolute maxi-

mum ratings because stresses beyond the listed rat-

ings can cause permanent damage to the devices.

Always sequence VCC on first, then VEE, followed by

the logic inputs and analog signals. If power-supply

sequencing is not possible, add two small signal diodes

(D1, D2) in series with the supply pins for overvoltage

protection (Figure 1).

Adding diodes reduces the analog-signal range to one

diode drop below VCC and one diode drop above VEE,

but does not affect the devices’ low switch resistance

and low leakage characteristics. Device operation is

unchanged, and the difference between VCC and VEE

should not exceed 13V. These protection diodes are

not recommended when using a single supply if signal

levels must extend to ground.

High-Frequency Performance

In 50Ω systems, signal response is reasonably flat up

to 50MHz (see Typical Operating Characteristics).

Above 20MHz, the on response has several minor

peaks which are highly layout dependent. The problem

is not turning the switch on, but turning it off. The off-

state switch acts like a capacitor and passes higher

frequencies with less attenuation. At 10MHz, off isola-

tion is about -50dB in 50Ω systems, becoming worse

(approximately 20dB per decade) as frequency in-

creases. Higher circuit impedances also degrade off

isolation. Adjacent channel attenuation is about 3dB

above that of a bare IC socket and is entirely due to

capacitive coupling.

*

X, Y, Z

*

VCC

D1

EXTERNAL

BLOCKING DIODE

VCC

*

X_, Y_, Z_

*

MAX4581

MAX4582

MAX4583

VEE

D2

EXTERNAL

BLOCKING DIODE

VEE

*INTERNAL PROTECTION DIODES

Figure 1. Overvoltage Protection Using External Blocking

Diodes

Pin Nomenclature

The MAX4581/MAX4582/MAX4583 are pin-compatible

with the industry-standard 74HC4051/74HC4052/

74HC4053 and the MAX4051/MAX4052/MAX4053.

They function identically and have identical logic dia-

grams, although these parts differ electrically.

The pin designations and logic diagrams in this data

sheet conform to the original 1972 specifications pub-

lished by RCA for the CD4051/CD4052/CD4053. These

designations differ from the standard Maxim switch and

mux designations as found all other Maxim data sheets

(including the MAX4051/MAX4052/MAX4053) and may

cause confusion. Designers who feel more comfortable

with Maxim’s standard designations are advised that

the pin designations and logic diagrams on the

MAX4051/MAX4052/MAX4053 data sheet may be freely

applied to the MAX4581/MAX4582/MAX4583.

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