The ICS627-01 is a low cost, low jitter, high
performance clock synthesizer which can generate
frequencies required for HDTV receivers and settop boxes. Using ICS’s patented analog/digital
Phase-Locked Loop (PLL) techniques, the device
uses an inexpensive fundamental 27 MHz crystal
input to produce low jitter HDTV pixel clocks. It
has a separate input for a 1001/1000 or
2(1001/1000) conversion from a 13.5 MHz,
27 MHz or 54 MHz in
ut.
Block Diagram
VDD
Features
• Packaged in 28 pin SSOP (QSOP)
• HDTV frequencies of 74.25 and 74.175824 MHz
• Provides selectable B clock for 27.027 MHz or
other 1001/1000
• Uses a fundamental 27 MHz crystal or clock input
• All frequencies are generated exactly (zero ppm
synthesis error)
• Full CMOS output swings with 12 mA output
drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
• 3.3 V ±5% operating supply
GND
CLKIN
27.0 MHz
crystal or
clock
input
SB
SA2:0
X1/ICLK
X2
6
Crystal
Oscillator
x1001/1000
PLL
PLL
Clock
Synthesis
Circuitry
÷2
Output
Buffer
Output
Buffer
Output
Buffer
Output
Buffer
Output
Buffer
CLKB
CLKA
CLKC
(54 MHz)
CLKC/2
(27 MHz)
REFOUT
(27 MHz)
MDS 627-01 B1Revision 051600
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
23CLKAOA Clock output. See above table.
25REFOUTO27 MHz Reference Output.
26, 27SA0IPins 26, 27 should be connected together. Selects CLKA and CLKC frequencies. Internal p-u.
Key: I = Input; O = output; P = power supply connection; XI, XO = crystal connections; CI = clock input
MDS 627-01 B2Revision 051600
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
Page 3
PRELIMINARY INFORMATION
ICS627-01
HDTV Set-Top Clock Source
Electrical Specifications
ParameterConditionsMinimumTypicalMaximumUnits
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDDReferenced to GND7V
Inputs and Clock OutputsReferenced to GND-0.5VDD+0.5V
Ambient Operating Temperature070°C
Soldering TemperatureMax of 10 seconds260°C
Storage temperature-65150°C
DC CHARACTERISTICS (VDD = 3.3V unless noted)
Operating Voltage, VDD 3.153.303.45V
Input High Voltage, VIH2V
Input Low Voltage, VIL0.8V
Input High Voltage, VIH, ICLK and CLKIN(VDD/2)+1VDD/2V
Input Low Voltage, VIL, ICLK and CLKINVDD/2(VDD/2)-1V
Output High Voltage, VOHIOH=-12mA2.4V
Output Low Voltage, VOLIOL=12mA0.4V
Output High Voltage, VOH, CMOS levelIOH=-8mAVDD-0.4V
Operating Supply Current, IDDNo Load, note 2TBDmA
Short Circuit CurrentEach output±50mA
Input Capacitance7pF
Frequency synthesis error All clocks0ppm
AC CHARACTERISTICS (VDD = 3.3V unless noted)
Input Frequency27.0MHz
Output Clock Rise Time0.8 to 2.0V1.5ns
Output Clock Fall Time2.0 to 0.8V1.5ns
Output Clock Duty CycleAt VDD/24060%
Maximum Absolute Jitter, short termTBDps
Notes:1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged
exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.
2. With all clocks at highest MHz.
External Components
The ICS627-01 requires a minimum number of external components for proper operation. Use a low
inductance ground plane, connect all GNDs to this. Connect 0.01µF decoupling caps across pins 5 and 10, 8
and 10, and 22 and 20, as close to the ICS627-01 as possible. A series termination resistor of 33 Ω may be
used for each clock output. The 27.000 MHz crystal must be connected as close to the chip as possible. The
crystal should be a fundamental mode, parallel resonant. Crystal capacitors should be connected from pins X1
to ground and X2 to ground. The value of these capacitors is given by the following equation, where C
crystal load capacitance: Crystal caps (pF) = (CL-6) x 2. So for a crystal with 16pF load capacitance, two 20pF
caps should be used. If a clock input is used, drive it into X1 and leave X2 unconnected.
MDS 627-01 B3Revision 051600
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
is the
L
Page 4
PRELIMINARY INFORMATION
HDTV Set-Top Clock Source
Package Outline and Package Dimensions
(
For current dimensional specifications, see JEDEC Publication No. 95.)
ICS627R-01ICS627R-01tubes28 pin SSOP (QSOP)0-70 °C
ICS627R-01TICS627R-01tape and reel28 pin SSOP (QSOP)0-70 °C
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the
infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in
normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements
are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any
ICS product for use in life support devices or critical medical instruments.
A
MDS 627-01 B4Revision 051600
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
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