21G5L [ICSI]
DIGITAL VIDEO CAMERA CLOCK; DIGITAL VIDEO CAMERA CLOCK
| 型号： | 21G5L |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | DIGITAL VIDEO CAMERA CLOCK |
| 文件： | 总5页 (文件大小：142K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS421-05
DIGITAL VIDEO CAMERA CLOCK
Description
Features
The ICS421-05 is a low-power, low-jitter clock
synthesizer developed for digital camera applications.
The device accepts a 27 MHz input clock to support
common digital video camera interface frequencies
including a 12 MHz for USB, 24.576 MHz for
IEEE1394, and a 72 MHz CCD clock. Power
consumption was minimized by lowering the voltage
requirement to 1.8 V minimum.
• Ultra-low operating voltage from 1.8 V to 2.4 V
• 10 mA supply current
• 27 MHz input clock frequency
• Fixed 24.576 MHz clock supports IEEE1394
• Fixed 12 MHz clock supports USB
• Fixed 72 MHz CCD clock
• Packaged in 8-pin TSSOP (Pb free)
The ICS421-05 utilizes a small form factor 8-pin
TSSOP package.
ICS is a leader in low power, consumer application
clock sources. Devices are capable of supporting CCD,
video, audio, USB, CPU, and other peripherals.
Block Diagram
VDD
2
IEEE
24.576M
PLL
27 MHz
Input Clock
Clock
Buffer
CLKIN
72M
12M
CCD/
USB
PLL
1
OE_USB
GND
MDS 421-05 B
1
Revision 072304
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS421-05
DIGITAL VIDEO CAMERA CLOCK
OE_USB Operation Table
Pin Assignment
OE_USB
Function
CLKIN
VDD
1
2
3
4
8
7
6
5
OE_USB
12M
0
1
Output tri-state
Output running
GND
VDD
24.576M
72M
8 pin (173 mil) TSSOP
Pin Descriptions
Pin
Number
Pin
Name
CLKIN
VDD
Pin
Type
Input
Pin Description
27 MHz single ended clock input.
1
2
3
Power Connect to voltage supply.
Power Connect to ground.
GND
4
5
6
7
8
24.576M
72M
Output 24.576 MHz clock output.
Output 72 MHz clock output for CCD.
Power Connect to voltage supply.
Output 12 MHz clock output for USB.
VDD
12M
OE_USB
Input
Output enable for 12M clock for USB. See table for functionality,
internal pull-down.
External Components
1) The 0.01µF decoupling capacitor should be mounted
on the component side of the board as close to the
Series Termination Resistor
Clock output traces over one inch should use series
termination. To series terminate a 50Ω trace (a
commonly used trace impedance), place a 33Ω resistor
in series with the clock line, as close to the clock output
pin as possible. The nominal impedance of the clock
output is 20Ω.
VDD pin as possible. No vias should be used between
decoupling capacitor and VDD pin. The PCB trace to
VDD pin should be kept as short as possible, as should
the PCB trace to the ground via. Distance of the ferrite
bead and bulk decoupling from the device is less
critical.
Decoupling Capacitor
2) To minimize EMI, the 33Ω series termination resistor
(if needed) should be placed close to the clock output.
As with any high-performance mixed-signal IC, the
ICS421-05 must be isolated from system power supply
noise to perform optimally.
3) An optimum layout is one with all components on the
same side of the board, minimizing vias through other
signal layers (the ferrite bead and bulk decoupling
capacitor can be mounted on the back). Other signal
traces should be routed away from the ICS421-05. This
includes signal traces just underneath the device, or on
layers adjacent to the ground plane layer used by the
device.
A decoupling capacitor of 0.01µF must be connected
between VDD and the PCB ground plane.
PCB Layout Recommendations
For optimum device performance and lowest output
phase noise, the following guidelines should be
observed.
MDS 421-05 B
2
Revision 072304
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS421-05
DIGITAL VIDEO CAMERA CLOCK
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS421-05. These ratings,
which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of
the device at these or any other conditions above those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can
affect product reliability. Electrical parameters are guaranteed only over the recommended operating
temperature range.
Item
Rating
Supply Voltage, VDD
All Inputs and Outputs
-0.5 V to 7 V
-0.5 V to VDD +0.5 V
0 to +70 °C
-65 to +150 °C
125 °C
Ambient Operating Temperature
Storage Temperature
Junction Temperature
Soldering Temperature
260 °C
Recommended Operating Conditions
Parameter
Min.
Typ.
Max.
+70
Units
°C
Ambient Operating Temperature
0
–
Power Supply Voltage (measured in respect to GND)
+1.8
+2.4
V
DC Electrical Characteristics
VDD = 1.8 V to 2.4 V, Ambient Temperature 0 to +70°C, unless stated otherwise
Parameter
Operating Voltage
Symbol
VDD
VIH
Conditions
Min.
1.80
Typ.
Max.
Units
2.40
VDD/2-0.5
TBD
V
V
V
V
V
V
Input High Voltage
Input Low Voltage
Input High Voltage
Input Low Voltage
Output High Voltage
CLKIN
VDD/2+0.5
VIL
CLKIN
VIH
OE_USB pin
OE_USB pin
TBD
1.9
VIL
VOH
VDD = 2.4 V,
IOH = -4 mA
Output Low Voltage
Output High Voltage
Output Low Voltage
Operating Supply Current
VOL
VOH
VOL
IDD
VDD = 2.4 V,
IOL = 4 mA
0.4
0.4
V
V
VDD = 1.8 V
IOH = -4 mA
1.4
VDD = 1.8 V
IOL = 4 mA
V
No load, 3 out
10
mA
MDS 421-05 B
3
Revision 072304
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS421-05
DIGITAL VIDEO CAMERA CLOCK
Parameter
Symbol
IOS
Conditions
Min.
Typ.
50
Max.
Units
mA
W
Short Circuit Current
Each output
Nominal Output Impedance
On-chip Pull-down Resistor
Zo
20
OE_USB
150
kΩ
Notes: 1. Nominal switching threshold is VDD/2
AC Electrical Characteristics
VDD = 1.8 V to 2.4 V, Ambient Temperature 0 to +70°C, unless stated otherwise
Parameter
Input Frequency
Symbol
Conditions
Clock Input
Min.
Typ. Max. Units
27
MHz
ns
Output Rise Time
Output Fall Time
Output Rise Time
Output Fall Time
tOR
tOF
tOR
tOF
VDD=2.4 V, 20% to
80%, CL=10 pF
1.8
VDD=2.4 V, 80% to
20%, CL=10 pF
1.8
2.5
2.5
ns
ns
ns
VDD=1.8 V, 20% to
80%, CL=10 pF
VDD=1.8 V, 80% to
20%, CL=10 pF
Output Clock Duty Cycle
Absolute Pk-Pk Jitter
at VDD/2
50
%
ps
72 MHz output clock
Power OFF to lock
±200
PLL Lock Time within 1%
10
ms
Thermal Characteristics
Parameter
Symbol
Conditions
Still air
Min.
Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
θ
θ
110
100
80
°C/W
°C/W
°C/W
°C/W
JA
JA
JA
JC
1 m/s air flow
3 m/s air flow
Thermal Resistance Junction to Case
θ
35
Marking Diagram
Notes:
8
5
1. ###### is the lot code.
2. YYWW is the last two digits of the year, and the week
number that the part was assembled.
YYWW
21G5L
######
3. “L” designates Pb (lead) free package.
1
4
MDS 421-05 B
4
Revision 072304
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
ICS421-05
DIGITAL VIDEO CAMERA CLOCK
Package Outline and Package Dimensions (8-pin TSSOP, 173 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Min Max
Inches
Max
8
Symbol
Min
--
A
A1
A2
b
--
1.20
0.15
1.05
0.30
0.20
3.10
0.047
0.006
0.041
0.012
0.05
0.80
0.19
0.09
2.90
0.002
0.032
0.007
E1
E
INDEX
AREA
C
0.0035 0.008
0.114 0.122
0.252 BASIC
0.169 0.177
0.0256 Basic
D
E
E1
e
L
6.40 BASIC
4.30 4.50
0.65 Basic
1
D
0.45
0°
0.75
8°
0.018
0°
0.030
8°
α
aaa
--
0.10
--
0.004
A
A2
A1
c
- C -
e
SEATING
PLANE
b
L
aaa C
Ordering Information
Part / Order Number
ICS421G-05LF
Marking
21G5L
Shipping Packaging
Tubes
Package
8-pin TSSOP
8-pin TSSOP
Temperature
0 to +70 °C
0 to +70 °C
ICS421G-05LFT
Tape & Reel
“LF” denotes Pb (lead) free package.
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.
MDS 421-05 B
5
Revision 072304
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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