CY28409 Cypress Semiconductor, CY28409 Datasheet - Page 16

• Manufacturer Part Number: CY28409
• Description: Clock Synthesizer with Differential SRC and CPU Outputs
• Manufacturer: Cypress Semiconductor

Document #: 38-07445 Rev. *B
Table 9. Maximum Lumped Capacitive Output Loads
Test and Measurement Set-up
For Differential CPU and SRC Output Signals
The following diagram shows lumped test load configurations
for the differential Host Clock Outputs.
Table 10. CPU Clock Current Select Function
Ordering Information
CY28409OC
CY28409OCT
CY28409ZC
CY28409ZCT
3V66 Clocks
Board Target Trace/Term Z
PCI Clocks
DOT Clock
USB Clock
REF Clock
Part Number
Clock
Figure 12. Lumped Load For Single-ended Output Signals (for AC Parameters Measurement)
50 Ohms
IR E F
C P U C
C P U T
2 .0 V
1 .5 V
0 .8 V
Max Load
56-pin SSOP
56-pin SSOP – Tape and Reel
56-pin TSSOP
56-pin TSSOP – Tape and Reel
30
30
20
10
30
T r
-
Figure 11. 0.7V Load Configuration
Reference R, I
R
REF
3 .3 V
3 . 3 V s ig n a l s
Unit
pF
pF
pF
pF
pF
= 475 1%, I
T
T
P C B
P C B
tD C
Package Type
T f
REF
REF
– V
DD
0 V
= 2.32 mA
(3*R
2 p F
2 p F
REF
M e a s u re m e n t
M e a s u re m e n t
-
O u tp u t u n d e r T e s t
)
P o in t
P o in t
Output Current
I
OH
P ro b e
L o a d C a p
= 6*I
REF
Commercial, 0 to 70 C
Commercial, 0 to 70 C
Commercial, 0 to 70 C
Commercial, 0 to 70 C
Product Flow
CY28409
Page 16 of 18
0.7V @ 50
Voh @ Z