
6
FN6071.1
March 15, 2005
FIGURE 2A. DIFFERENTIAL TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2C. SINGLE ENDED TEST CIRCUIT
FIGURE 2. DRIVER DATA RATE, PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
Test Circuits and Waveforms (Continued)
D
DE
DI
3V
SIGNAL
GENERATOR
CL = 15pF
RDIFF = 60
Z
Y
CL = 15pF
OUT (Y)
3V
0V
tPLH
1.5V
VOH
VOL
50%
tPHL
OUT (Z)
tPHL
VOH
VOL
50%
tPLH
DIFF OUT (Y - Z)
tR
+VOD
-VOD
90%
tF
10%
DI
tDD
50%
tDD
50%
SKEW = |tPLH (Y or Z) - tPHL (Z OR Y)|
tr, tf = 4.5ns
D
DE
DI
3V
SIGNAL
GENERATOR
Z
Y
CL = 15pF
RL = 27
VOM
OUT
VOH + VOL
2
≈ 1.5V
VOM =
D
DE
DI
Z
Y
VCC
GND
SW
PARAMETER
OUTPUT
RE
DI
SW
tHZ
Y/Z
X
1/0
GND
tLZ
Y/Z
X
0/1
VCC
tZH
Y/Z
0 (Note 5)
1/0
GND
tZL
Y/Z
0 (Note 5)
0/1
VCC
tZH(SHDN)
Y/Z
1 (Note 8)
1/0
GND
tZL(SHDN)
Y/Z
1 (Note 8)
0/1
VCC
SIGNAL
GENERATOR
110
CL = 50pF
OUT (Y, Z)
3V
0V
1.5V
VOH
0V
VOH - 0.25V
tHZ
OUT (Y, Z)
VCC
VOL
VOL + 0.25V
tLZ
DE
OUTPUT HIGH
OUTPUT LOW
tZL, tZL(SHDN)
tZH, tZH(SHDN)
NOTE 7
50%
NOTE 7
ISL43485