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PCK2509SADH Datasheet(PDF) 3 Page - NXP Semiconductors

Part # PCK2509SADH
Description  50-150 MHz 1:9 SDRAM clock driver
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCK2509SADH Datasheet(HTML) 3 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
PCK2509SA
50–150 MHz 1:9 SDRAM clock driver
2000 Dec 01
3
PIN DESCRIPTIONS
PIN NUMBER
SYMBOL
TYPE
NAME, FUNCTION, and DIRECTION
1
AGND
GND
Analog ground. AGND provides the ground reference for the analog circuitry.
2, 10, 15, 22
VCC
PWR
Power supply
3, 4, 5, 8, 9
1Y (0–4)
OUT
Clock outputs. These outputs provide low-skew copies of CLK. Output bank 1Y(0–4) is enabled
via the1G input. These outputs can be disabled to a logic LOW state by de-asserting the 1G control
input. Each output has an integrated 25
Ω series-damping resistor.
6, 7, 18, 19
GND
GND
Ground
11
1G
IN
Output bank enable. 1G is the output enable for outputs 1Y(0–4). When 1G is LOW, outputs
1Y(0–4) are disabled to a logic LOW state. When 1G is HIGH, all outputs 1Y(0–4) are enabled and
switch at the same frequency as CLK.
12
FBOUT
OUT
Feedback output. FBOUT is dedicated for external feedback. It switches at the same frequency as
CLK. When externally wired to FBIN, FBOUT completes the feedback loop of the PLL. FBOUT has
an integrated 25
Ω series-damping resistor.
13
FBIN
IN
Feedback input. FBIN provides the feedback signal to the internal PLL. FBIN must be hard-wired
to FBOUT to complete the PLL. The integrated PLL synchronizes CLK and FBIN so that there is
nominally zero phase error between CLK and FBIN.
14
2G
IN
Output bank enable. 2G is the output enable for outputs 2Y(0–3). When 2G is LOW, outputs
2Y(0–3) are disabled to a logic LOW state. When 2G is HIGH, all outputs 2Y(0–3) are enabled and
switch at the same frequency as CLK.
16, 17, 20, 21
2Y (0–3)
OUT
Clock outputs. These outputs provide low-skew copies of CLK. Output bank 2Y(0–3) is enabled
via the 2G input. These outputs can be disabled to a logic LOW state by de-asserting the 2G
control input. Each output has an integrated 25
Ω series-damping resistor.
23
AVCC
PWR
Analog power supply. AVCC provides the power reference for the analog circuitry. In addition,
AVCC can be used to bypass the PLL for test purposes. When AVCC is strapped to ground, PLL is
bypassed and CLK is buffered directly to the device outputs.
24
CLK
IN
Clock input. CLK provides the clock signal to be distributed by the PCK2509SA clock driver. CLK
is used to provide the reference signal to the integrated PLL that generates the clock output
signals. CLK must have a fixed frequency and fixed phase for the PLL to obtain phase lock. Once
the circuit is powered up and a valid CLK signal is applied, a stabilization time is required for the
PLL to phase lock the feedback signal to its reference signal.
FUNCTION TABLE
INPUTS
OUTPUTS
1G
2G
CLK
1Y (0–4)
2Y (0–3)
FBOUT
X
X
L
L
L
L
L
L
H
L
L
H
L
H
H
L
H
H
H
L
H
H
L
H
H
H
H
H
H
H


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