MAX4619CSE データシートの表示（PDF） - Maxim Integrated

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MAX4619CSE

High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches

Maxim Integrated 

MAX4617/MAX4618/MAX4619

High-Speed, Low-Voltage, CMOS Analog

Multiplexers/Switches

The logic-level thresholds are TTL/CMOS compatible

when VCC is +5V. As VCC rises, the threshold increas-

es; as VCC falls, the threshold decreases. For example,

when VCC = +3V the guaranteed minimum logic-high

threshold decreases to 2.0V

Power Supply

These devices operate from a single supply between

+2.5V and +5.5V. All of the bipolar precautions must be

observed. At room temperature, they actually “work”

with a single supply near or below +2V, although as

supply voltage decreases, switch on-resistance

becomes 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, 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

GND, but does not affect the devices’ low switch resis-

tance and low leakage characteristics. Device opera-

tion is unchanged, and the difference between VCC

and GND should not exceed 6V. These protection

diodes are not recommended 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 that 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 frequen-

cies with less attenuation. At 10MHz, off-isolation is

about -50dB in 50Ω systems, becoming worse (approx-

imately 20dB per decade) as frequency increases.

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.

Pin Nomenclature

The MAX4617/MAX4618/MAX4619 are pin compatible

with the industry-standard 74HC4051/74HC4052/

74HC4053 and the MAX4581/MAX4582/MAX4583. In

single-supply applications, they function identically and

have identical logic diagrams, although these parts dif-

fer 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 found on 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 MAX4617/MAX4618/MAX4619.

*

X, Y, Z

*

VCC

D1

EXTERNAL

BLOCKING DIODE

VCC

*

X_, Y_, Z_

*

MAX4617

MAX4618

MAX4619

VEE

D2

EXTERNAL

BLOCKING DIODE

GND

*INTERNAL PROTECTION DIODES

Figure 1. Overvoltage Protection Using External Blocking

Diodes

Maxim Integrated

9

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