5

FN6096.1

Test Circuits and Waveforms

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

capacitance.

FIGURE 3. BREAK-BEFORE-MAKE TIME

50%

90%

V+

0V

0V

LOGIC

INPUT

SWITCH

OUTPUT

10%

0V

VA0, VB0

V(NO or NC)

()

+

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

=

LOGIC

INPUT

COMA

A0,B0

ADD1-0

50

Ω

35pF

GND

A1-A3

V+

C

V+

C

COMB

B1-B3

∆V

OUT

OFF

ON

OFF

Q =

SWITCH

OUTPUT

LOGIC

INPUT

V+

0V

GND

COMA

Ax, Bx

LOGIC

INPUT

ADDX

V+

C

Repeat test for other switches.

1nF

0

Ω

COMB

90%

V+

0V

LOGIC

INPUT

SWITCH

OUTPUT

0V

LOGIC

INPUT

ADD1-0

COMA

35pF

50

Ω

A0-A3

GND

V+

C

V+

C

B0-B3

COMB

ISL43L840