MAX4590CWE 查看數據表（PDF） - Maxim Integrated

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MAX4590CWE

1.25Ω, Dual SPST, CMOS Analog Switches

Maxim Integrated 

1.25Ω, Dual SPST,

CMOS Analog Switches

___________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, NO, or COM. If power-supply sequencing

is not possible, add two small signal diodes (D1, D2) in

series with 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 and low leakage characteristics. Device

operation is unchanged, and the difference between V+

and V- should not exceed 44V. These protection diodes

are not recommended when using a single supply.

COM_

+15V

D1

V+

*

*

*

*

MAX4580

MAX4590

MAX4600

NO_

V-

D2

-15V * INTERNAL PROTECTION DIODES

Figure 1. Overvoltage Protection Using External Blocking

Diodes

+3V

LOGIC

INPUT 0

50%

tr < 20ns

tf < 20ns

VO

SWITCH 0

OUTPUT

0.9V0

tON

tOFF

0.9V0

LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES

THAT HAVE THE OPPOSITE LOGIC SENSE.

Figure 2. Switching-Time Test Circuit

MAX4580

MAX4590

+5V

+15V

MAX4600

SWITCH

INPUT

VCOM_

VL

COM_

IN_

V+

NO_

OR NC_

SWITCH

OUTPUT

VO

RL

100Ω

CL

35pF

LOGIC

INPUT

GND

V-

0

-15V

REPEAT TEST FOR EACH SWITCH. FOR LOAD

CONDITIONS, SEE Electrical Characteristics.

CL INCLUDES FIXTURE AND STRAY CAPACITANCE.

( ) VO = VCOM

RL

RL + RON

8 _______________________________________________________________________________________

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