Product Specification

SP4257

Page 2 of 6

4x4mm 20-Lead QFN

GND

15

14

13

12

11

3

4

5

2

1

GND

GND

GND

RF2

GND, RF2 Term.

GND

GND, RF1 Term.

RF1

GND

GND

No.

Name

Description

1

GND

RF Ground

2

GND

RF Ground

RF1

RF I/O

4

GND

RF Ground

5

GND

RF Ground

6

GND

RF Ground

7

GND

RF Ground

RFC

RF Common

9

GND

RF Ground

10

GND

RF Ground

11

GND

RF Ground

12

GND

RF Ground

RF2

RF I/O

14

GND

RF Ground

15

GND

RF Ground

CTRL2

Control 2

CTRL1

Control 1

VSS / GND

Negative Supply Option

19

GND

Digital Ground

20

VDD

Supply

Pad

GND

RF Ground Pad

Table 2. Pin Descriptions

Table 3. Absolute Maximum Ratings

Electrostatic Discharge (ESD) Precautions

When handling this CMOS device, observe the

same precautions that you would use with other ESD-

sensitive devices. Although this device contains

circuitry to protect it from damage due to ESD,

precautions should be taken to avoid exceeding the

rating specified.

Latch-Up Avoidance

Unlike conventional CMOS devices, CMOS

devices are immune to latch-up.

Table 4. Operating Ranges @ 25 °C

Notes: 1. RF pins 3, 8, and 13 must be at 0 VDC. The RF pins do

not require DC blocking capacitors for proper operation if the

0 VDC requirement is met.

2. Pins 16 and 17 are the CMOS controls that set the four

operating states.

3. Connect pin 18 to GND to enable the negative voltage

disable internal -3 V supply generator. See paragraph

“Switching Frequency.”

Symbol

Parameter/Condition

Min

Max

Units

Power supply voltage

-0.3

4.0

V

Voltage on any DC input

-0.3

V

RF power on RFC, RF1, RF2

On Port/ Terminated Port

33/24

dBm

Storage temperature

-65

+150

°C

Operating temperature

-40

+85

°C

ESD voltage

(Human Body Model)

1000

V

Parameter

Min

Typ

Max

Unit

2.7

3.0

3.3

V

8

20

µA

Control Voltage High

V

Control Voltage Low

0

V

Switching Frequency

The SP4257 has a maximum 25 kHz switching rate

when the internal negative voltage generator is used

(pin 18=GND). The rate at which the SP4257 can be

switched is only limited to the switching time if an

Figure 3. Pin Configuration (Top View)

Exceeding absolute maximum ratings may cause

permanent damage. Operation should be restricted to

the limits in the Operating Ranges table. Operation

between operating range maximum and absolute

maximum for extended periods may reduce reliability.

Table 5. Truth Table

CTRL1

CTRL2

RFC – RF1

RFC – RF2

Low

Low

OFF

OFF

Low

High

OFF

ON

High

Low

ON

OFF

High

High

Notes: 1. The operation of the SP4257 is not supported or

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