Product Specification

SP4273

Page 3 of 10

Control Voltages

Signal Path

Pin 4 (V1) = High

RFC to RF1

Pin 4 (V1) = Low

RFC to RF2

Table 5. Single-pin Control Logic Truth Table

Table 6. Complementary-pin Control Logic

Truth Table

Control Voltages

Signal Path

Pin 6 (V2) = Low

Pin 4 (V1) = High

RFC to RF1

Pin 6 (V2) = High

Pin 4 (V1) = Low

RFC to RF2

Control Logic Input

The SP4273 is a versatile RF CMOS switch that

supports two operating control modes; single-pin

control mode and complementary-pin control

mode.

Single-pin control mode enables the switch to

operate with a single control pin (pin 4) supporting

a +3-volt CMOS logic input, and requires a

dedicated +3-volt power supply connection (pin 6).

This mode of operation reduces the number of

control lines required and simplifies the switch

control interface typically derived from a CMOS

µProcessor I/O port.

Complementary-pin control mode allows the

switch to operate using complementary control

pins V1 and V2 (pins 4 & 6), that can be directly

driven by +3-volt CMOS logic or a suitable

µProcessor I/O port. This enables the SP4273 to

operate in positive control voltage mode within the

SP4273 operating limits.

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