87002-02 Datasheet, PDF (1/16 Pages) Integrated Device Technology – Output frequency range

1:2, Differential-to-LVCMOS/LVTTL Zero
Delay Clock Generator
87002-02
DATA SHEET
General Description
The 87002-02 is a highly versatile 1:2 Differential-to-
LVCMOS/LVTTL Clock Generator. The 87002-02 has a differential
clock input. The CLK, nCLK pair can accept most standard
differential input levels. Internal bias on the nCLK input allows the
CLK input to accept LVCMOS/LVTTL. The 87002-02 has a fully
integrated PLL and can be configured as zero delay buffer, multiplier
or divider and has an input and output frequency range of
15.625MHz to 250MHz. The reference divider, feedback divider and
output divider are each programmable, thereby allowing for the
following output-to-input frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4,
1:8. The external feedback allows the device to achieve “zero delay”
between the input clock and the output clocks. The PLL_SEL pin can
be used to bypass the PLL for system test and debug purposes. In
bypass mode, the reference clock is routed around the PLL and into
the internal output dividers.
Features
• Two LVCMOS/LVTTL outputs, 7 typical output impedance
• CLK, nCLK pair can accept the following differential
input levels: LVPECL, LVDS, HSTL, HCSL, SSTL
• Internal bias on nCLK to support LVCMOS/LVTTL levels on CLK
input
• Output frequency range: 15.625MHz to 250MHz
• Input frequency range: 15.625MHz to 250MHz
• VCO range: 250MHz to 500MHz
• External feedback for “zero delay” clock regeneration
with configurable frequencies
• Programmable dividers allow for the following output-to-input
frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8
• Fully integrated PLL
• Cycle-to-cycle jitter: 45ps (maximum)
• Output skew: 35ps (maximum)
• Static phase offset: -10ps ± 150ps (3.3V ± 5%)
• Full 3.3V or 2.5V operating supply
• 5V tolerant inputs
• 0°C to 70°C ambient operating temperature
• Available in lead-free (RoHS 6) package
• Industrial temperature information available upon request
Block Diagram
PLL_SEL ^Pullup
CLK ^Pulldown
nCLK ^{Pullup/Pulldown}
÷2, ÷4, ÷8, ÷16
÷32, ÷64, ÷128
0
1
PLL
FB_IN ^Pulldown
8:1, 4:1, 2:1, 1:1,
1:2, 1:4, 1:8
SEL0 ^Pulldown
SEL1 ^Pulldown
SEL2 ^Pulldown
SEL3 ^Pulldown
MR ^Pulldown
87002-02 Rev C 7/13/15
Pin Assignment
GND 1
20 VDDO
Q0 2 19 Q1
Q0
V_DDO 3
18 GND
SEL0 4
17 VDDO
SEL1 5 16 nc
Q1
SEL2 6 15 MR
SEL3 7 14 FB_IN
V_DD 8
CLK 9
13 PLL_SEL
12 VDDA
nCLK 10 11 GND
87002-02
20-Lead TSSOP
6.50mm x 4.40mm x 0.925mm package body
G Package
Top View
1
©2015 Integrated Device Technology, Inc.