September 2006
rev 0.4
PCS5I9772
2.5V or 3.3V, 200-MHz, 12-Output Zero Delay Buffer
Features
The PCS5I9772 features one on-chip crystal oscillator and
two LVCMOS reference clock inputs and provides 12
outputs partitioned in three banks of four outputs each.
Each bank divides the VCO output per SEL(A:C) settings,
see Functional Table.
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Output frequency range: 8.33MHz to 200MHz
Input frequency range: 6.25MHz to 125MHz
2.5V or 3.3V operation
Split 2.5V/3.3V outputs
±2% max Output duty cycle variation
12 clock outputs: drive up to 24 clock lines
One feedback output
Three reference clock inputs: crystal or LVCMOS
300pS max output-output skew
Phase-locked loop (PLL) bypass mode
‘SpreadTrak’
Output enable/disable
Pin-compatible with CY29772, MPC9772 and
MPC972
These dividers allow output to input ratios of 8:1, 6:1, 5:1,
4:1, 3:1, 8:3, 5:2, 2:1, 5:3, 3:2, 4:3, 5:4, 1:1, and 5:6. Each
LVCMOS-compatible output can drive 50Ω series or
parallel-terminated transmission lines. For series-
terminated transmission lines, each output can drive one or
two traces, giving the device an effective fanout of 1:24.
The PLL is ensured stable given that the VCO is configured
to run between 200MHz and 500MHz. This allows a wide
range of output frequencies from 8MHz to 200MHz. For
normal operation, the external feedback input, FB_IN, is
connected to the feedback output, FB_OUT. The internal
VCO is running at multiples of the input reference clock set
by the feedback divider, see Frequency Table.
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Industrial temperature range: -40°C to +85°C
52 pin 1.0 mm TQFP package
RoHS Compliance
Functional Description
When PLL_EN is LOW, PLL is bypassed and the reference
clock directly feeds the output dividers. This mode is fully
static and the minimum input clock frequency specification
does not apply.
The PCS5I9772 is
a
low-voltage high-performance
200MHz PLL-based zero delay buffer, designed for
high-speed clock-distribution applications.
XIN
XOUT
VCO_SEL
Block Diagram
PLL_EN
REF_SEL
Sync
Frz
QA0
QA1
QA2
QA3
D
D
Q
Q
0
1
0
1
TCLK0
Phase
VCO
Detector
TCLK1
TCLK_SEL
LPF
Sync
Frz
FB_IN
QB0
QB1
QB2
QB3
FB_SEL2
MR#/OE
Power-On
Reset
Sync
Frz
/4,/6,/8,/12
QC0
QC1
D
Q
/4,/6,/8,/10
/2/4,/6,/8
2
Sync
Frz
SELA(0,1)
SELB(0,1)
QC2
QC3
D
D
Q
Q
2
2
0
1
Sync
Frz
FB_OUT
/4,/6,/8,/10
Sync Pulse
SELC(0,1)
/2
Data Generator
2
FB_SEL(0,1)
Sync
Frz
D
Q
SYNC
SCLK
12
Output Disable
Circuitry
SDATA
INV_CLK
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.