8

FN6056.2

March 13, 2006

Test Circuits and Waveforms

Logic input waveform is inverted for switches that have the opposite

logic sense.

capacitance.

Logic input waveform is inverted for switches that have the opposite

logic sense.

capacitance.

FIGURE 1. SWITCHING TIMES

FIGURE 2A. Q MEASUREMENT POINTS

FIGURE 2B. Q TEST CIRCUIT

FIGURE 2. CHARGE INJECTION

50%

3V

0V

LOGIC

INPUT

SWITCH

OUTPUT

90%

0V

90%

VNO0

V(NO)

()

+

------------------------------

=

LOGIC

INPUT

COM

NO0

ENABLE

300

Ω

35pF

GND

V-

C

NO1-NO3

V+

ADD1, 2

C

V+

C

50%

90%

3V

0V

LOGIC

INPUT

SWITCH

OUTPUT

10%

0V

VNO0

V(NO)

()

+

------------------------------

=

LOGIC

INPUT

COM

NO0

ADD1, 2

300

Ω

35pF

GND

NO1-NO2

V+

ENABLE

C

V-

C

V+

C

NO3

V-

C

OFF

ON

OFF

Q =

SWITCH

OUTPUT

LOGIC

INPUT

3V

0V

GND

COMX

NOX

LOGIC

INPUT

ENABLE

ADDX

V-

C

V+

C

Repeat test for other switches.

1nF

0

Ω

ISL43840