PI6C3420ATE [PERICOM]
27 MHz Spread Spectrum Clock Synthesizer; 27 MHz的扩频时钟合成器
| 型号： | PI6C3420ATE |
| 厂家： | 
PERICOM SEMICONDUCTOR CORPORATION |
| 描述： | 27 MHz Spread Spectrum Clock Synthesizer |
| 文件： | 总5页 (文件大小：487K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PI6C3420A
27 MHz Spread Spectrum
Clock Synthesizer
Description
Product Features
• Two High Precision outputs:
—27.000 MHz ssc clock output
—27.000 MHz clock output
The PI6C3420A is spread spectrum clock synthesizer targeted
for video and graphics applications. The primary purpose of
the spread spectrum is to minimize EMI emissions. This device
generates two 27.000 MHz outputs: a 27.000 MHz down spread
spectrum output and a 27.000 MHz non-spread spectrum output.
The PI6C3420A down spread range is from –1% to –1.75% when
output frequency is at 27 MHz. Spread spectrums are selectable
through external pins.
• Four Down-Spread options:
— Down-spread: –1% to –1.75%
• 14.318 MHz input (crystal or external reference)
• Single 3.3V Power Supply
• Packaging (Pb-Free and Green):
— SOTiny™ 6-pin SOT-23 (T)
Typically, the PI6C3420A uses a 14.318 MHz input crystal or
frequency source to generate a 27 MHz clock output. Users
can also get the adequate output clock setting from 15.1 MHz to
46.2MHzbytuningtheinputfrequencywhichcanbesetfrom8MHz
to 24.5 MHz; the frequency multiplication factor is 1.886X.
The PI6C3420A is housed in a lead-free and green, SOT-23, 6-pin
SOTiny package.
The PI6C3420A belongs to Pericom's clock and timing products.
For other frequencies, features, functions or input/output not
specified, please contact Pericom for information.
Pin Configuration
Block Diagram
ꢁꢉꢃꢍꢂ
ꢁꢂꢃꢄꢅꢆꢇꢈ
ꢐꢈꢀ
REFIN/X1
27M
X2
ꢑꢒꢓꢔꢕ
ꢍꢖꢗꢒꢉꢘ
Clock
Synthesizer
�
ꢀꢀ
S0
S1
27M_SSC
ꢉꢊꢋꢌꢍꢍꢎꢃꢍꢏ
ꢉꢊꢋ
PS8848B
08/29/06
06-0278
1
PI6C3420A
27 MHz Spread Spectrum
Clock Synthesizer
Pin Description
Pin Name
Pin No
I/O Type
Power
Ground
I/O
Description
V
5
2
4
3
Power Supply
Ground
DD
GND
27M
27 MHz clock output.
27M_SSC/S0
I/O
S0 is activated during power on for logic state strapping, then
switches to 27 MHz SSC clock output.
X1/REFIN
X2/S1
1
6
I/O
I/O
Crystal or reference clock input
X2/S1 is a multiple function pin. S1 is active during power on
selection of SSC spread then switches to crystal input.
Spread Spectrum Selection Table
(V = 3.3V±10%, Ambient temperature +25°, f
= 27 MHz)
CC
OUT
S0
0
S1
0
Down Spread(%)
–1
0
1
–1.25
–1.50
–1.75
1
0
1
1
PS8848B
08/29/06
06-0278
2
PI6C3420A
27 MHz Spread Spectrum
Clock Synthesizer
Electrical Specifications
(1)
Maximum Ratings
Supply Voltage to Ground Potential......................................................... 5.5V
All Inputs and Outputs..................................................... -0.5V to V +0.5V
DD
Note:
1. Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the device.
This is a stress rating only and functional operation of the
device at these or any other conditions above those indi-
cated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions
for extended periods may affect reliability.
Ambient Operating Temperature ............................................-10°C to +80°C
Storage Temperature .............................................................-65°C to +150°C
Operating Temperature ................................................................. 0 to +70°C,
Junction Temperature ............................................................................150°C
Soldering Temperature ..........................................................................260°C
o
DC Characteristics (V = 3.3V ±10%, Ambient Temperature 0°C to +70 C, f = 14.318 MHz, f
= 27 MHz)
Max.
DD
IN
OUT
(1)
Symbol Parameter
Conditions
Min.
+3.0
2
Typ.
Unit
V
V
Operating Voltage
Input High Voltage
Input Low Voltage
Output High Voltage
Output High Voltage
Output Low Voltage
Output Low Voltage
Supply Current
+3.3
+3.6
DD
V
IH
V
V
0.8
V
IL
V
V
I
I
I
I
= -4 mA
= -6 mA
= 4 mA
= 10 mA
2.4
2.0
V
OH
OH
OH
OH
OL
OL
V
V
V
0.4
1.2
55
V
OL
OL
V
I
All outputs active with C 15pF load
mA
Ω
DD
L =
Z
Nominal Output Impedance High side buffer
Nominal Output Impedance Low side buffer
65
40
5
OUT_UP
Z
Ω
OUT_LOW
C
Input Capacitance
Input pins
pF
IN
Note:
1. Typical conditions are at 3.3V for room temperature at 25°C
o
AC Characteristics (V = 3.3V ±10%, Ambient Temperature 0°C to +70 C)
DD
(1)
Symbol Parameter
Conditions
Min.
Typ.
Max.
24.5
46.2
Unit
f
REFIN Input Frequency
Clock Output Frequency
Output Clock Rise Time
Output Clock Fall Time
Short term jitter
REFIN Clock Input
Multiplication factor (f /f = 1.885715)
8
14.318
27
MHz
MHz
ns
IN
f
15.1
OUT
RISE
IN OUT
t
From 0.4V to 2.4V, C = 15 pF load
3
L
t
From 2.4V to 0.4V, C = 15 pF load
2.7
250
50
ns
FALL
L
T
Cycle-to-cycle jitter (f
= 27 MHz)
350
80
ps
J_SHORT
TDC
OUT
Input Clock Duty Cycle
Output Clock Duty Cycle
REFIN/X1, Measured @ V /2
20
45
%
DD
Measured @ V /2 (f
= 27 MHz)
OUT
50
55
%
DD
TDC
∆
Actual mean frequency
error versus target
Input frequency = 14.31818 MHz, Output fre-
quency = 27 MHz
0
ppm
ƒ/ƒ
Note:
1. Typical conditions are at 3.3V for room temperature at 25°C
PS8848B
08/29/06
06-0278
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PI6C3420A
27 MHz Spread Spectrum
Clock Synthesizer
Application Information
(1-4)
Reference circuit for graphic chipset application
VDD
VDD
VDD
0.1µF 0.01µF
5
0.1µF 0.01µF
5
3,6
Strapping to low
3,6
Strapping to high
2
2
Notes:
1. PI6C3420A can accept a 14.31818MHz reference clock or crystal clock.
2. Power supply pin decoupling capacitors should be placed as close as possible to VDD pin. Via's at the VDD pin should be avoided.
3. Spread select pin's (S0 and S1):
Pin 3 (27M_SSC/S0) and Pin 6 (X2/S1) provide logic state strapping function. When strapping resistor connects to VDD, S0 and S1 are
set to logic HIGH. When strapping resistor connects to Ground, S0 or S1 will set to logic LOW.
4. Refer to "Spread Spectrum Selection Table", for more details on the strapping logic.
Crystal Load Capacitors
If a crystal is used with the device, the external trim capacitors CLtrim are used to adjust the effective capacitance to match the
required crystal load capacitance. The CLtrim value can be derived from formula CLtrim = 2*CL – (Cs + Ci). Typical CLtrim = 28pF
when crystal load = 18pF, stray capacitance Cs = 3pF and XTAL pins capacitance = 5pF.
Xtal
1
6
CLtrim
CLtrim
Note: Pericom's SRX7316-E - 14.318 MHz
series resonant crystal is recommended.
Recommended Crystal Specification
Pericom recommends: SRX7316-E Crystal for optimum performance.
Parameter
Value
Units
Mode of oscillation, and cut
Frequency
Fundamental AT
14.318
±20
±30
18
MHz
PPM
Frequency tolerance
Tempurature
PPM
Load Cap
pF
Equivalent series resistance
Drive to level
40
Ω
100
±5
µW
Aging Stability
PPM/YR
mm(inch)
Size = Length x Width x Height
11.18(.440) x 4.65(.183) x 13.46(.530)
PS8848B
08/29/06
06-0278
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PI6C3420A
27 MHz Spread Spectrum
Clock Synthesizer
DOCUMENT CONTROL NO.
PD - 1912
0.075
1.90
BSC
REVISION: C
DATE: 03/09/05
6
5
2
4
3
0.059
0.068
1.50 0.102
1.75 0.118�
2.60
3.00
0º - 10º
Datum "A"
0.004
0.023
0.10
0.60
0.037
0.95
BSC
0.014 0.35
0.019 0.50
0.110 2.80
0.118 3.00
1.45�MAX.
0.057
X.XX DENOTES DIMENSIONS
X.XX
SEATING
PLANE
IN MILLIMETERS
0.00
0.15
0.000
0.005
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335 • www.pericom.com
Notes:
1)
2)
3)
Controlling dimensions in millimeters
Ref: EIAJ SC-74A
Foot length is measured at flat portion of foot, reference to Datum “A”
DESCRIPTION: 6-Pin Small Outline Transistor
Plastic Package, SOT-23
PACKAGE CODE: T
(1-3)
Ordering Information
Ordering Code
PI6C3420ATE
Package Code
PackageType
T
Pb-free & Green, 6-Pin SOT-23
Notes:
1. Thermal characteristics and package top marking information can be found at http://www.pericom.com/packaging/
2. E = Pb-free and Green
3. X suffix = tape/reel
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
PS8848B
08/29/06
06-0278
5
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