MAX4638(2002) データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX4638
(Rev.:2002)

3.5Ω, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers

Maxim Integrated 

3.5Ω, Single 8:1 and Dual 4:1,

Low-Voltage Analog Multiplexers

Detailed Description

The MAX4638/MAX4639 are low-voltage, CMOS analog

muxes. The MAX4638 is an 8:1 mux that switches one

of eight inputs (NO1–NO8) to a common output (COM)

as determined by the 3-bit binary inputs A0, A1, and

A2. The MAX4639 is a 4:1 dual mux that switches one

of four differential inputs to a common differential out-

put as determined by the 2-bit binary inputs A0 and A1.

Both the MAX4638/MAX4639 have an EN input that can

be used to enable or disable the device. When dis-

abled, all channels are switched off. See Truth Tables.

Applications Information

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

logic inputs. If power-supply sequencing is not possi-

ble, 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 V+ and one diode drop above V-, but

does not affect the devices’ low switch resistance.

Device operation is unchanged, and the difference

between V+ and V- should not exceed 6V. These pro-

tection diodes are not recommended when using a sin-

gle supply. For single-supply operation, V- should be

connected to GND as close to the device as possible.

COM_

+2.5V

D1

V+

*

*

*

*

MAX4638

MAX4639

NO_

V-

D2

-2.5V * INTERNAL PROTECTION DIODES

Figure 1. Overvoltage Protection Using External Blocking

Diodes

Ordering Information (continued)

PART

MAX4639EGE

MAX4639EUE

MAX4639ESE

MAX4639EGP

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

PIN-PACKAGE

16 QFN (4 ✕ 4)

16 TSSOP

16 SO

20 QFN (4 ✕ 4)

MAX4638 (Single 8-to-1 Mux)

A2

A1

A0

EN

X

X

X

0

0

0

0

1

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

1

ON SWITCH

None

NO1

NO2

NO3

NO4

NO5

NO6

NO7

NO8

Truth Tables

MAX4639 (Dual 4-to-1 Mux)

A1

A0

X

X

0

0

0

1

1

0

1

1

EN COMA

0

None

1

NO1A

1

NO2A

1

NO3A

1

NO4A

COMB

None

NO1B

NO2B

NO3B

NO4B

_______________________________________________________________________________________ 9

Share Link: