
ASM2I9940L
http://onsemi.com
6
Table 10. AC Characteristics (TA = 0°C to 70°C, VCCI = 2.5 V $ 5%, VCCO = 2.5 V $ 5%)
Symbol
Characteristic
Condition
Min
Typ
Max
Unit
Fmax
Maximum Input Frequency
200
MHz
tPLH
Propagation Delay
PECL_CLK v 150 MHz
CMOS_CLK v 150 MHz
2.6
2.3
4.0
3.1
5.2
4.0
nS
tPLH
Propagation Delay
PECL_CLK > 150 MHz
CMOS_CLK > 150 MHz
2.8
2.3
3.8
3.1
5.0
4.0
nS
tsk(o)
Outputtooutput Skew
Within one bank
PECL_CLK
CMOS_CLK
200
pS
tsk(pp)
Part–to–Part Skew
PECL_CLK ≤ 150 MHz
CMOS_CLK ≤ 150 MHz
2.6
1.7
nS
tsk(pp)
Part–to–Part Skew
PECL_CLK > 150 MHz
CMOS_CLK > 150 MHz
2.2
1.7
nS
tsk(pp)
Part–to–Part Skew
PECL_CLK
CMOS_CLK
1.2
1.0
nS
DC
Output Duty Cycle
fCLK < 134 MHz
fCLK v 200 MHz
Input DC = 50%
45
40
50
55
60
%
tr, tf
Output Rise/Fall Time
0.5 – 1.8 V
0.3
1.2
nS
7. Tested using standard input levels, Production tested @ 150 MHz.
8. Across temperature and voltage ranges, includes output skew.
9. For a specific temperature and voltage, includes output skew.
VTT
Pulse
Generator
Z=50
Ω
Z0=50
Ω
Z0 =50
Ω
RT
RT =50
Ω
VTT
=50
Ω
ASM2I9940L
Figure 3. LVCMOS_CLK ASM2I9940L AC Test Reference for VCC = 3.3 V and VCC = 2.5 V
VTT
Differential
Pulse Generator
Z=50
Ω
Z0=50
Ω
Z0
RT = 50
=50
Ω
TT
RT=50
Ω
ASM2I9940L
Figure 4. PECL_CLK ASM2I9940L AC Test Reference for VCC = 3.3 V and VCC = 2.5 V
V