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CY29948
Document #: 38-07288 Rev. *C
Page 4 of 8
Notes:
6. Parameters are guaranteed by design and characterization. Not 100% tested in production. All parameters specified with loaded outputs.
7. Outputs driving 50
Ω transmission lines.
8. 50% input duty cycle.
9. See Figures 2 and 3.
10. Setup and hold times are relative to the falling edge of the input clock
11. Part-to-Part skew at a given temperature and voltage.
AC Parameters[6] VDD = VDDC = 3.3V ±10% or 2.5V ±5%, over the specified operating range.
Parameter
Description
Conditions
Min.
Typ.
Max.
Unit
Fmax
Input Frequency[7]
VDD = 3.3V
–
200
MHz
VDD = 2.5V
–
170
Tpd
PECL_CLK to Q Delay[7]
VDD = 3.3V
4.0
–
8.0
ns
TCLK to Q Delay[7]
4.4
–
8.9
PECL_CLK to Q Delay[7]
VDD = 2.5V
6.0
–
10.0
TCLK to Q Delay[7]
6.4
–
10.9
FoutDC
Output Duty Cycle[7, 8, 9]
Measured at VDD/2
45
–
55
%
tpZL, tpZH
Output Enable Time (all outputs)
2
–
10
ns
tpLZ, tpHZ
Output Disable Time (all outputs)
2
–
10
ns
Tskew
Output-to-Output Skew[7, 9]
–
150
250
ps
Tskew(pp)
Part-to-Part Skew[11]
PECL_CLK to Q
–
–
1.5
ns
TCLK to Q
–
–
2.0
Ts
Set-up Time[7, 10]
SYNC_OE to PECL_CLK
1.0
–
–
ns
SYNC_OE to TCLK
0.0
–
–
Th
Hold Time[7, 10]
PECL_CLK to SYNC_OE
0.0
–
–
ns
TCLK to SYNC_OE
1.0
–
–
Tr/Tf
Output Clocks Rise/Fall Time[9]
0.8V to 2.0V, VDD = 3.3V
0.20
–
1.0
ns
0.6V to 1.8V, VDD = 2.5V
0.20
–
1.3
Pulse
Generator
Z = 50 ohm
Zo = 50 ohm
VTT
Zo = 50 ohm
VTT
RT = 50 ohm
RT = 50 ohm
CY29948 DUT
Figure 2. LVCMOS_CLK CY29948 Test Reference for VCC = 3.3V and VCC = 2.5V
Differential
Pulse
Generator
Z = 50 ohm
Zo = 50 ohm
Zo = 50 ohm
VTT
RT = 50 ohm
CY29948 DUT
Zo = 50 ohm
RT = 50 ohm
VTT
Figure 3. PECL_CLK CY29948 Test Reference for VCC = 3.3V and VCC = 2.5V
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