CY2313ANZ Cypress Semiconductor Corporation., CY2313ANZ Datasheet - Page 6

• Manufacturer Part Number: CY2313ANZ
• Description: 13 Output, 3.3v Sdram Buffer For Desktop Pcs With 3 Dimms
• Manufacturer: Cypress Semiconductor Corporation.

Application Information
Clock traces must be terminated with either series or parallel termination, as is normally done.
Summary
Ordering Information
Document #: 38-07144 Rev. *B
Application Circuit
CY2313ANZSC–1
Pb-free
CY2313ANZSXC–1
CY2313ANZSXC–1T
• Surface mount, low-ESR, ceramic capacitors should be used for filtering. Typically, these capacitors have a value of 0.1 μF.
• The value of the series terminating resistor satisfies the following equation, where Rtrace is the loaded characteristic impedance
• Footprints must be laid out for optional EMI-reducing capacitors, which should be placed as close to the terminating resistor
• A Ferrite Bead may be used to isolate the Board V
• If a Ferrite Bead is used, a 10 μF–22 μF tantalum bypass capacitor should be placed close to the Ferrite Bead. This capacitor
In some cases, smaller value capacitors may be required.
of the trace, Rout is the output impedance of the buffer (typically 25Ω), and Rseries is the series terminating resistor.
as is physically possible. Typical values of these capacitors range from 4.7 pF to 22 pF.
greater than 50Ω impedance at the clock frequency, under loaded DC conditions. Please refer to the application note “Layout
and Termination Techniques for Cypress Clock Generators” for more details.
prevents power supply droop during current surges.
* CY2280 48 PIN SSOP
(or CY2281 or CY2282)
* THIS FREQUENCY SYNTHESIZER IS USED TO
GENERATE CPU, PCI, USB, REF, AND APIC CLOCKS.
Ordering Code
Rseries > Rtrace – Rout
CPUCLK
USBCLK
PCICLK
APIC
REF
SDATA
R
Package
SCLK
s
Name
S21
S21
S21
0.1uF
C
V
d
DD
3.3V
28-Pin SOIC
28-Pin SOIC
28-Pin SOIC Tape and Reel
DD
CY2313A: 28-PIN SOIC
Package Type
from the clock generator V
CY2313 28 PIN SOIC
SDATA
SCLK
BUF_IN
V
V
DD
SS
SDRAM ( 0-12)
Commercial
Commercial
Commercial
DD
C
C
R
d
t
s
island. Ensure that the Ferrite Bead offers
Operating
= SERIES TERMINATING RESISTORS
= DECOUP LING CAPACITOR S
= OPTIONAL EMI-R EDUCING CAP ACI TORS
R
Range
s
C
t
CY2313ANZ
SDRAM ( 0-12)
Page 6 of 8
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