The ICS627-01 is a low cost, low jitter, high
performance clock synthesizer which can generate
frequencies required for HDTV receivers and set-
top 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 input.
ICS627-01
HDTV Set-Top Clock Source
MDS 627-01 B
1
Revision 051600
Integrated Circuit Systems, Inc. · 525 Race Street · San Jose ·CA·95126·(408) 295-9800tel · www.icst.com
PRELIMINARY INFORMATION
Description
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
REFOUT
(27 MHz)
Block Diagram
Crystal
Oscillator
PLL
Clock
Synthesis
Circuitry
Output
Buffer
CLKC
(54 MHz)
27.0 MHz
crystal or
clock
input
X1/ICLK
X2
CLKC/2
(27 MHz)
÷2
CLKA
CLKB
SB
SA2:0
6
Output
Buffer
Output
Buffer
Output
Buffer
Output
Buffer
CLKIN
VDD
GND
x1001/1000
PLL
ICS627-01
HDTV Set-Top Clock Source
MDS 627-01 B
2
Revision 051600
Integrated Circuit Systems, Inc. · 525 Race Street · San Jose ·CA·95126·(408) 295-9800tel · www.icst.com
PRELIMINARY INFORMATION
SA2
X2
X1
VDD
VDD
CLKIN
VDD
VDD
VDD
GND
GND
CLKC/2
CLKC
CLKB
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Assignment
SA2
SA0
SA0
REFOUT
GND
CLKA
VDD
GND
GND
GND
GND
SB
SA1
SA1
Key: I = Input; O = output; P = power supply connection; XI, XO = crystal connections; CI = clock input
Number
Name
Type
Description
1, 28
SA2
I
Pins 1, 28 should be connected together. Selects CLKA and CLKC frequencies. Internal p-u.
2
X2
XO
Connect to a fundamental 27.0 MHz crystal or leave unconnected for clock.
3
X1/ICLK
XI
Connect to a fundamental 27.0 MHz crystal or clock input.
4, 5, 7-9, 22
VDD
P
Connect to 3.3V.
6
CLKIN
CI
Clock input to produce 1001/1000 or 2(1001/1000) at CLKB. See table above.
10, 11, 18, 19
GND
P
Connect to ground.
12
CLKC/2
O
C Clock output divided-by-2. See table above.
13
CLKC
O
C Clock output. See above table.
14
CLKB
O
B Clock output. See above table.
15, 16
SA1
I
Pins 15, 16 should be connected together. Selects CLKA and CLKC frequencies. Internal p-u.
17
SB
I
B Clock Select. Selects CLKB frequency. See above table. Internal pull-up.
20, 21, 24
GND
P
Connect to ground.
23
CLKA
O
A Clock output. See above table.
25
REFOUT
O
27 MHz Reference Output.
26, 27
SA0
I
Pins 26, 27 should be connected together. Selects CLKA and CLKC frequencies. Internal p-u.
0 = connect directly to GND
1 = connect directl to VDD
CLKB Select Table (MHz)
SA2 SA1 SA0
Input
CLKA
CLKC
CLKC/2
0
0
0
27.0
108.0
54.0
27.0
0
0
1
27.0
74.175824*
TEST
TEST
0
1
0
27.0
54.0
54.0
27.0
0
1
1
27.0
74.25*
54.0
27.0
1
0
0
TEST
1
0
1
27.0
74.175824
54.0
27.0
1
1
0
TEST
1
1
1
27.0
74.250
54.0
27.0
CLKA/CLKC Select Table (MHz)
SB
CLKIN
CLKB
Multiplier
0
13.5
27.027
2002/1000
1
27 - 54
27.027 - 54.054
1001/1000
Pin Descriptions
* These selections are recommended for the lowest jitter
ICS627-01
HDTV Set-Top Clock Source
MDS 627-01 B
3
Revision 051600
Integrated Circuit Systems, Inc. · 525 Race Street · San Jose ·CA·95126·(408) 295-9800tel · www.icst.com
PRELIMINARY INFORMATION
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (n
note 1)
Supply voltage, VDD
Referenced to GND
7
V
Inputs and Clock Outputs
Referenced to GND
-0.5
VDD+0.5
V
Ambient Operating Temperature
0
70
°C
Soldering Temperature
Max of 10 seconds
260
°C
Storage temperature
-65
150
°C
DC CHARACTERISTICS (VDD = 3.3V
V unless noted)
Operating Voltage, VDD
3.15
3.30
3.45
V
Input High Voltage, VIH
2
V
Input Low Voltage, VIL
0.8
V
Input High Voltage, VIH, ICLK and CLKIN
(VDD/2)+1
VDD/2
V
Input Low Voltage, VIL, ICLK and CLKIN
VDD/2
(VDD/2)-1
V
Output High Voltage, VOH
IOH=-12mA
2.4
V
Output Low Voltage, VOL
IOL=12mA
0.4
V
Output High Voltage, VOH, CMOS level
IOH=-8mA
VDD-0.4
V
Operating Supply Current, IDD
No Load, note 2
TBD
mA
Short Circuit Current
Each output
±50
mA
Input Capacitance
7
pF
Frequency synthesis error
All clocks
0
ppm
AC CHARACTERISTICS (VDD = 3.3V
V unless noted)
Input Frequency
27.0
M H z
Output Clock Rise Time
0.8 to 2.0V
1.5
ns
Output Clock Fall Time
2.0 to 0.8V
1.5
ns
Output Clock Duty Cycle
At VDD/2
40
60
%
Maximum Absolute Jitter, short term
TBD
ps
Electrical Specifications
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.
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
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
L
is the
crystal load capacitance: Crystal caps (pF) = (C
L
-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.
External Components
ICS627-01
HDTV Set-Top Clock Source
MDS 627-01 B
4
Revision 051600
Integrated Circuit Systems, Inc. · 525 Race Street · San Jose ·CA·95126·(408) 295-9800tel · www.icst.com
PRELIMINARY INFORMATION
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.
Ordering Information
Part/Order Number
Marking
Shipping packaging
Package
Temperature
ICS627R-01
ICS627R-01
tubes
28 pin SSOP (QSOP)
0-70 °C
ICS627R-01T
ICS627R-01
tape and reel
28 pin SSOP (QSOP)
0-70 °C
Package Outline and Package Dimensions
(
For current dimensional specifications, see JEDEC Publication No. 95.)
28 pin SSOP
Inchees
Millim
meters
Symbol
Min
Max
Min
Max
A
0.053
0.069
1.35
1.75
A1
0.004
0.010
0.10
0.25
b
0.008
0.012
0.20
0.30
c
0.007
0.010
0.19
0.25
D
0.386
0.394
9.80
10.01
e
.025 BSSC
0.635 B
BSC
E
0.228
0.244
5.79
6.20
E1
0.150
0.157
3.81
3.99
L
0.016
0.050
0.41
1.27
b
D
E1
E
e
A1
c
A
L
INDEX
AREA
1
2
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