CY23EP09 Cypress Semiconductor, CY23EP09 Datasheet - Page 2

• Manufacturer Part Number: CY23EP09
• Description: 9-Output Zero Delay Buffer
• Manufacturer: Cypress Semiconductor

Document #: 38-07760 Rev. *B
Pin Definition
Select Input Decoding
Zero Delay and Skew Control
All outputs should be uniformly loaded to achieve Zero Delay
between the input and output. Since the CLKOUT pin is the
internal feedback to the PLL, its relative loading can adjust the
input-output delay.
The output driving the CLKOUT pin will be driving a total load
of 5 pF plus any additional load externally connected to this
pin. For applications requiring zero input-output delay, the total
load on each output pin (including CLKOUT) must be the
same. If input-output delay adjustments are required, the
CLKOUT load may be changed to vary the delay between the
REF input and remaining outputs.
For zero output-output skew, be sure to load all outputs
equally. For further information refer to the application note
entitled “CY2305 and CY2309 as PCI and SDRAM Buffers”.
Notes:
1. Weak pull-down.
2. Weak pull-down on all outputs.
3. Weak pull-ups on these inputs.
4. This output is driven and has an internal feedback for the PLL. The load on this output can be adjusted to change the skew between the reference and output.
S2
0
0
1
1
Pin
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
S1
0
1
0
1
REF
CLKA1
CLKA2
V
GND
CLKB1
CLKB2
S2
S1
CLKB3
CLKB4
GND
V
CLKA3
CLKA4
CLKOUT
DD
DD
[3]
[3]
[1]
CLOCK A1–A4
[2]
[2]
[2]
[2]
[2]
[2]
[2]
[2]
Three-state
[2]
Signal
Driven
Driven
Driven
CLOCK B1–B4
Ground
Input reference frequency
Buffered clock output, Bank A
Buffered clock output, Bank A
3.3V or 2.5V supply
Ground
Buffered clock output, Bank B
Buffered clock output, Bank B
Select input, bit 2
Select input, bit 1
Buffered clock output, Bank B
Buffered clock output, Bank B
3.3V or 2.5V supply
Buffered clock output, Bank A
Buffered clock output, Bank A
Buffered output, internal feedback on this pin
Three-state
Three-state
Driven
Driven
CLKOUT
Driven
Driven
Driven
Driven
[4]
Description
Output Source
Reference
PLL
PLL
PLL
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PLL Shutdown
CY23EP09
Page 2 of 13
N
N
Y
N