6V49205B_16 Datasheet, PDF (1/16 Pages) Integrated Device Technology – Freescale System Clock w/Selectable DDR Frequency

Freescale P10XX and P20XX System Clock
w/Selectable DDR Frequency
6V49205B
DATASHEET
General Description
The 6V49205B is a main clock for Freescale P10xx and
P20xx-based systems. It has a selectable System CCB clock
and 2 DDRCLK speeds – 100M or 66.66M. The 6V49205B
also provides LP-HCSL PCIe outputs for low power and
reduced board space.
Output Features
• 1 - Sys_CCB 3.3V LVCMOS output @ 100M/83.33M/
80M/66.66M
• 1 - DDRCLK 3.3V LVCMOS output @ 100M or 66.66M ¹
• 1 - 125M 3.3V LVCMOS output
• 6 - LP-HCSL PCIe pairs selectable @ 100M or 125M
• 6 - 25MHz 3.3V LVCMOS outputs
• 2 - 2.048M 3.3V LVCMOS outputs
• 2 - USB 3.3V LVCMOS outputs @12M or 24M
Key Specifications
• PCIe Gen1-2-3 compliant
• <3p rms phase noise on REF outputs
Recommended Application
System Clock for Freescale P10xx and P20xx-based designs
Features
• Replaces 11 crystals, 2 oscillators and 3 clock generators;
lowers cost, power and area
• Integrated terminations on LP-HCSL PCIe outputs;
eliminate 24 resistors, saving 41mm² of board area
• Industrial temperature range operation; supports
demanding environmental conditions
• Advanced 3.3V CMOS process; high-performance,
low-power
• Supports independent spread spectrum on
Sys_CCB/DDRCLK and PCIe outputs
• Available in space-saving 7x7mm 48-pin VFQFPN with
0.5mm pad pitch; reduced board space without the need for
fine-pitch assembly techniques
Block Diagram
SCLK
SDATA
^FS0
^FS1
^SEL100#_66
^SELPCIE125#_100
X1
25MHz
Crystal
X2
Control
Logic
Crystal
Oscillator
PLL1
(SS)
PLL4
(SS)
PLL3
(non-
SS)
PLL2
(non-
SS)
100MHz
GND
Sys_CCB
DDRCLK
PCIe_L(5:0)
USB_CLK(2:1)
2.048M(1:0)
125M
REF(5:0)
Note 1: For DDR Clock: Processor core and I/O supply rails must be ramped with VDD3P3 or earlier. Clock signal will be
clamped LOW and output clock will be 100MHz if this is not followed (see diagram below).
VDD3P3
DDRCLK
R40
10K
R39
10K
6V49205B REVISION R 11/23/16
1
©2016 Integrated Device Technology, Inc.