MAX309CSE(1994) データシートの表示（PDF） - Maxim Integrated

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MAX309CSE
(Rev.:1994)

Precision, 8-Channel/Dual 4-Channel, High-Performance, CMOS Analog Multiplexers

Maxim Integrated 

Precision, 8-Channel/Dual 4-Channel,

High-Performance, CMOS Analog Multiplexers

______________________________________________________________Pin Description

PIN

MAX308

MAX309

1, 15, 16

—

—

1, 16

2

2

3

3

4–7

—

—

4–7

8

—

—

8, 9

9–12

—

—

10–13

13

14

14

15

NAME

A0, A2, A1

A0, A1

EN

V-

NO1–NO4

NO1A–NO4A

COM

COMA, COMB

NO8–NO5

NO4B–NO1B

V+

GND

FUNCTION

Address Inputs

Address Inputs

Enable Input

Negative Supply Voltage Input

Analog Inputs—bidirectional

Analog Inputs—bidirectional

Analog Output—bidirectional

Analog Outputs—bidirectional

Analog Inputs—bidirectional

Analog Inputs—bidirectional

Positive Supply Voltage Input

Ground

__________Applications Information

Operation with

Supply Voltages Other than 15V

Using supply voltages less than ±15V will reduce the

analog signal range. The MAX308/MAX309 switches

operate with ±4.5V to ±20V bipolar supplies or with a

+4.5V to +30V single supply. Connect V- to GND when

operating with a single supply. Both device types can

also operate with unbalanced supplies, such as +24V

and -5V. The Typical Operating Characteristics graphs

show typical on-resistance with 20V, 15V, 10V, and 5V

supplies. (Switching times increase by a factor of two

or more for operation at 5V.)

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 may cause permanent damage to the devices.

Always sequence V+ on first, then V-, followed by the

logic inputs, NO, or COM. If power-supply sequencing

is not possible, add two small signal diodes in series

with supply pins for overvoltage protection (Figure 1).

Adding diodes reduces the analog signal range to 1V

below V+ and 1V above V-, but does not affect the

devices’ low switch resistance and low leakage charac-

teristics. Device operation is unchanged, and the differ-

ence between V+ and V- should not exceed +44V.

V+

NO

COM

Vg

V-

Figure 1. Overvoltage Protection Using External Blocking

Diodes

6 _______________________________________________________________________________________

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