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CY28409 Datasheet(PDF) 16 Page - Cypress Semiconductor

Part No. CY28409
Description  Clock Synthesizer with Differential SRC and CPU Outputs
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Maker  CYPRESS [Cypress Semiconductor]
Homepage  http://www.cypress.com
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CY28409 Datasheet(HTML) 16 Page - Cypress Semiconductor

 
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CY28409
Document #: 38-07445 Rev. *B
Page 16 of 18
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 9. Maximum Lumped Capacitive Output Loads
Clock
Max Load
Unit
PCI Clocks
30
pF
3V66 Clocks
30
pF
USB Clock
20
pF
DOT Clock
10
pF
REF Clock
30
pF
CPUT
T
PC B
T
PC B
CPUC
33Ω
33Ω
49.9Ω
49.9Ω
M e as urem e n t
Po in t
2pF
475Ω
IR E F
M e a s urem ent
Po in t
2pF
Figure 11. 0.7V Load Configuration
2 .0 V
0 .8 V
3.3V
0V
Tr
Tf
1 .5 V
3. 3V sig n a l s
tD C
Pro b e
O u tp u t unde r T e st
Loa d C a p
-
-
Figure 12. Lumped Load For Single-ended Output Signals (for AC Parameters Measurement)
Table 10. CPU Clock Current Select Function
Board Target Trace/Term Z
Reference R, IREF – VDD (3*RREF)
Output Current
Voh @ Z
50 Ohms
RREF = 475 1%, IREF = 2.32 mA
IOH = 6*IREF
0.7V @ 50
Ordering Information
Part Number
Package Type
Product Flow
CY28409OC
56-pin SSOP
Commercial, 0
° to 70°C
CY28409OCT
56-pin SSOP – Tape and Reel
Commercial, 0
° to 70°C
CY28409ZC
56-pin TSSOP
Commercial, 0
° to 70°C
CY28409ZCT
56-pin TSSOP – Tape and Reel
Commercial, 0
° to 70°C


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