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6
FN6097.3
November 17, 2004
FIGURE 2A. Q MEASUREMENT POINTS
FIGURE 2B. Q TEST CIRCUIT
FIGURE 2. CHARGE INJECTION
FIGURE 3A. tBBM MEASUREMENT POINTS
Repeat test for other switches. CL includes fixture and stray
capacitance.
FIGURE 3B. tBBM TEST CIRCUIT
FIGURE 3. BREAK-BEFORE-MAKE TIME
FIGURE 4. OFF ISOLATION TEST CIRCUIT
FIGURE 5. RON TEST CIRCUIT
Test Circuits and Waveforms (Continued)
VOUT
OFF
ON
OFF
Q =
VOUT x CL
SWITCH
OUTPUT
LOGIC
INPUT
V+
0V
CL
VOUT
RG
VG
GND
COMA,
Ax, Bx
LOGIC
INPUT
INH
ADD1
V+
C
Repeat test for other switches.
1000pF
0
COMB
ADD0
CHANNEL
SELECT
90%
V+
0V
tBBM
LOGIC
INPUT
SWITCH
OUTPUT
0V
VOUT
tr < 5ns
tf < 5ns
LOGIC
INPUT
ADD0-1
COMA
RL
CL
VOUT
35pF
50
A0-A3
GND
V+
C
INH
V+
C
B0-B3
COMB
ANALYZER
RL
SIGNAL
GENERATOR
0V or V+
Ax or Bx
COMx
GND
V+
10nF
ADD1
ADD0
CHANNEL
SELECT
Off-Isolation is measured between COM and “Off” NO terminal on
each switch.
Signal direction through switch is reversed and worst case values
are recorded.
INH
0V or V+
Ax or Bx
COMA or
ADD1
GND
VX
V1
RON = V1/100mA
100mA
V+
C
COMB
ADD0
CHANNEL
SELECT
INH
ISL84782