ICS85357AG-11LFT [IDT]
Clock Generator, 27MHz, PDSO20, 4.40 X 6.50 MM, 0.92 MM HEIGHT, ROHS COMPLIANT, MO-153, TSSOP-20;
| 型号： | ICS85357AG-11LFT |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Clock Generator, 27MHz, PDSO20, 4.40 X 6.50 MM, 0.92 MM HEIGHT, ROHS COMPLIANT, MO-153, TSSOP-20 时钟 光电二极管 外围集成电路 晶体 |
| 文件： | 总13页 (文件大小：146K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
GENERAL DESCRIPTION
FEATURES
The ICS85357-11 is
a
4:1 or 2:1, Crystal • One differential 3.3V LVPECL output
Oscillator-to-3.3V LVPECL / ECL Multiplexer .The ICS85357-
11 has 4 selectable crystal inputs. The device can support
10MHz to 27MHz parallel resonant crystals by connecting
external capacitors between XTALIN/XTALOUT and ground.
The select pins have internal pulldown resistors and leaving
one input unconnected (pulled to logic low by the internal
resistor) will transform the device into a 2:1 multiplexer. The
SEL1 lead is the most significant line and the binary number
applied to the select pins will select the same numbered data
input (i.e., 00 selects XTALIN0/XTALOUT0).
• 4:1 or 2:1 Crystal Oscillator Multiplexer
• Supports parallel resonant crystals with a frequency range
of 10MHz to 27MHz.The oscillator circuit is optimized for
parallel resonant mode, and will require external capacitance
• Maximum output frequency: 27MHz
• LVCMOS/LVTTL SEL0 and SEL1 inputs have
internal pulldown resistors
• LVPECL mode operating voltage supply range:
VCC = 3.135V to 3.465V, VEE = 0V
• ECL mode operating voltage supply range:
VCC = 0V, VEE = -3.135V to -3.465V
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
• Available in both standard (R0HS 5) and lead-free
(RoHS 6) packages
BLOCK DIAGRAM
PIN ASSIGNMENT
VCC
XTALIN0
XTALOUT0
XTALIN1
XTALOUT1
XTALIN2
XTALOUT2
XTALIN3
XTALOUT3
VEE
1
2
3
4
5
6
7
8
20
19
18
17
16
15
14
13
12
11
VCC
SEL1
SEL0
VCC
Q0
nQ0
VCC
nc
XTALIN0
00
01
OSC
OSC
OSC
OSC
XTALOUT0
XTALIN1
9
10
nc
VEE
Q0
nQ0
XTALOUT1
XTALIN2
ICS85357-11
20-LeadTSSOP
4.40mm x 6.50mm x 0.92mm body package
G Package
10
11
XTALOUT2
XTALIN3
TopView
XTALOUT3
SEL1 SEL0
85357AG-11
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REV. D OCTOBER 4, 2010
1
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
TABLE 1. PIN DESCRIPTIONS
Number
Name
VCC
Type
Description
1, 14, 17, 20
Power
Input
Input
Input
Input
Input
Input
Input
Input
Power
Positive supply pins.
Parallel resonant crystal input.
2
XTALIN0
XTALOUT0
XTALIN1
XTALOUT1
XTALIN2
XTALOUT2
XTALIN3
XTALOUT3
VEE
3
Parallel resonant crystal input.
4
Parallel resonant crystal input.
5
Parallel resonant crystal input.
6
7
Parallel resonant crystal input.
Parallel resonant crystal input.
8
Parallel resonant crystal input.
9
Parallel resonant crystal input.
10, 11
12, 13
15, 16
18
Negative supply pins.
nc
Unused
Output
Input
No connect.
nQ0, Q0
SEL0
Differential clock outputs. LVPECL interface levels.
Pulldown Clock select input. LVCMOS / LVTTL interface levels.
Pulldown Clock select input. LVCMOS / LVTTL interface levels.
19
SEL1
Input
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
Parameter
Test Conditions
Minimum
Typical
Maximum Units
Input Capacitance
Input Pulldown Resistor
4
pF
RPULLDOWN
51
kΩ
TABLE 3A. CONTROL INPUT FUNCTION TABLE
Inputs
Clock Out
SEL1
SEL0
CLK
0
0
1
1
0
1
0
1
XTALIN0, XTALOUT0
XTALIN1, XTALOUT1
XTALIN2, XTALOUT2
XTALIN3, XTALOUT3
85357AG-11
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REV. D OCTOBER 4, 2010
2
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
ABSOLUTE MAXIMUM RATINGS
SupplyVoltage, V
4.6V
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device.These ratings are stress specifications only.Functional
operation of product at these conditions or any conditions be-
yond those listed in the DC Characteristics or AC Character-
istics is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
CC
Inputs, V
-0.5V to VCC + 0.5 V
-0.5V to VCC + 0.5V
73.2°C/W (0 lfpm)
-65°C to 150°C
I
Outputs, VO
PackageThermal Impedance, θ
JA
StorageTemperature, T
STG
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VCC = 3.3V 5ꢀ, TA = 0°C TO 70°C
Symbol Parameter
Test Conditions
Minimum
Typical
Maximum Units
VCC
IEE
Positive Supply Voltage
Power Supply Current
3.135
3.3
3.465
50
V
mA
TABLE 4B. LVCMOS / LVTTL DC CHARACTERISTICS, VCC = 3.3V 5ꢀ, TA = 0°C TO 70°C
Symbol Parameter
Test Conditions
Minimum
Typical Maximum Units
VIH
VIL
IIH
Input High Voltage SEL0, SEL1
2
VCC + 0.3
0.8
V
V
Input Low Voltage SEL0, SEL1
Input High Current SEL0, SEL1
Input Low Current SEL0, SEL1
-0.3
VCC = VIN = 3.465V
150
µA
µA
IIL
VCC = 3.465V, VIN = 0V
-5
TABLE 4C. LVPECL DC CHARACTERISTICS, VCC = 3.3V 5ꢀ, TA=0°C TO 70°C
Symbol
VOH
Parameter
Test Conditions
Minimum
Typical
Maximum Units
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
VCC - 1.4
VCC - 2.0
0.6
VCC - 0.9
VCC - 1.7
1.0
V
V
V
VOL
VSWING
NOTE 1: Outputs terminated with 50Ω to VCC - 2V.
TABLE 5. CRYSTAL CHARACTERISTICS
Parameter
Test Conditions
Minimum Typical Maximum
Units
Mode of Oscillation / cut
Frequency
Fundamental / Parallel Resonant
10
27
70
7
MHz
Ω
Equivalent Series Resistance (ESR)
Shunt Capacitance
pF
TABLE 6. AC CHARACTERISTICS, VCC = 3.3V 5ꢀ, TA=0°C TO 70°C
Symbol Parameter Test Conditions
Minimum
Typical
Maximum Units
fMAX
Output Frequency Range
10
300
47
27
700
53
MHz
ps
tR / tF
odc
Output Rise/Fall Time
20ꢀ to 80ꢀ
Output Duty Cycle; NOTE 1, 2
ꢀ
oscTOL Crystal Oscillator Tolerance; NOTE 1
All parameters measured at 25MHz unless noted otherwise.
20
ppm
NOTE 1: Measured using C1 = 22pF and C2 = 27pF in parallel with 18pF crystals. Refer to Crystal Input Interface in the
Application Section.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
85357AG-11
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REV. D OCTOBER 4, 2010
3
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
PARAMETER MEASUREMENT INFORMATION
2V
SCOPE
VCC
Qx
80ꢀ
tF
80ꢀ
tR
VSWING
20ꢀ
LVPECL
VEE
Clock
Outputs
20ꢀ
nQx
-1.3V 0.165V
3.3V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT RISE/FALL TIME
nQ0
Q0
Pulse Width
tPERIOD
tPW
odc =
tPERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
85357AG-11
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REV. D OCTOBER 4, 2010
4
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
APPLICATION INFORMATION
CRYSTAL INPUT INTERFACE
suitable for most applications. Additional accuracy can be
achieved by adding two small capacitors C1 and C2 as shown in
Figure 1.Typical results using parallel 18pF crystals are shown
inTable 7.
A crystal can be characterized for either series or parallel mode
operation.The ICS85357-11 has a built-in crystal oscillator circuit.
This interface can accept either a series or parallel crystal without
additional components and generate frequencies with accuracy
XTAL_IN
C1
22p
X1
18pF Parallel Crystal
XTAL_OUT
C2
27p
FIGURE 1. Crystal Input Interface
Table 7. TYPICAL RESULTS OF CRYSTAL INPUT INTERFACE FREQUENCY FINE TUNING
Crystal Frequency
(MHz)
C1
(pF)
C2
(pF)
Measured Output Frequency
(MHz)
Accuracy
(PPM)
Duty Cycle
(%)
14.31818
15.00
22
22
22
22
22
27
27
27
27
27
14.318011
14.999862
16.660162
19.440081
24.000183
-12
-9
10
4
47.46
47.70
47.70
46.85
46.00
16.66
19.44
24.00
8
85357AG-11
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REV. D OCTOBER 4, 2010
5
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
TERMINATION FOR LVPECL OUTPUTS
50Ω transmission lines. Matched impedance techniques should
be used to maximize operating frequency and minimize signal
distortion. Figures 2A and 2B show two different layouts which
are recommended only as guidelines. Other suitable clock lay-
outs may exist and it would be recommended that the board
designers simulate to guarantee compatibility across all printed
circuit and clock component process variations.
The clock layout topology shown below is a typical termina-
tion for LVPECL outputs.The two different layouts mentioned
are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that gen-
erate ECL/LVPECL compatible outputs.Therefore, terminating
resistors (DC current path to ground) or current sources must
be used for functionality. These outputs are designed to drive
3.3V
Zo = 50Ω
125Ω
125Ω
FOUT
FIN
Zo = 50Ω
Zo = 50Ω
Zo = 50Ω
FOUT
FIN
50Ω
50Ω
VCC - 2V
1
RTT =
Zo
RTT
((VOH + VOL) / (VCC – 2)) – 2
84Ω
84Ω
FIGURE 2A. LVPECL OUTPUT TERMINATION
FIGURE 2B. LVPECL OUTPUT TERMINATION
85357AG-11
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REV. D OCTOBER 4, 2010
6
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS85357-11.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS85357-11 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.3V + 5ꢀ = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
•
•
Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 50mA = 173.3mW
Power (outputs)MAX = 30mW/Loaded Output pair
Total Power_MAX (3.465V, with all outputs switching) = 173.3mW + 30mW = 203.3mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the
device. The maximum recommended junction temperature for the devices is 125°C.
The equation for Tj is as follows: Tj = θJA * Pd_total + TA
Tj = JunctionTemperature
θJA = Junction-to-AmbientThermal Resistance
Pd_total =Total Device Power Dissipation (example calculation is in section 1 above)
TA = AmbientTemperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θJA must be used. Assuming a
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 66.6°C/W perTable 8 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.203W * 66.6°C/W = 83.5°C. This is well below the limit of 125°C
This calculation is only an example.Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,
and the type of board (single layer or multi-layer).
TABLE 8. THERMAL RESISTANCE θJA FOR 20-PIN TSSOP, FORCED CONVECTION
θJA byVelocity (Linear Feet per Minute)
0
200
98.0°C/W
66.6°C/W
500
88.0°C/W
63.5°C/W
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
114.5°C/W
73.2°C/W
NOTE: Most modern PCB designs use multi-layered boards.The data in the second row pertains to most designs.
85357AG-11
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REV. D OCTOBER 4, 2010
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in Figure 3.
VCC
Q1
VOUT
RL
50
VCC - 2V
FIGURE 3. LVPECL DRIVER CIRCUIT AND TERMINATION
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination
voltage ofV - 2V.
CC
•
•
For logic high, VOUT = V
= V
– 0.9V
OH_MAX
CC_MAX
)
= 0.9V
OH_MAX
(V
- V
CCO_MAX
For logic low, VOUT = V
= V
– 1.7V
OL_MAX
CC_MAX
)
= 1.7V
OL_MAX
(V
- V
CCO_MAX
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
))
Pd_H = [(V
– (V
- 2V))/R ] * (V
- V
) = [(2V - (V
- V
/R ] * (V
- V
) =
OH_MAX
CC_MAX
CC_MAX
OH_MAX
_MAX
OH_MAX
CC_MAX
OH_MAX
L
CC
L
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW
))
Pd_L = [(V
– (V
- 2V))/R ] * (V
- V
) = [(2V - (V
- V
/R ] * (V
- V
) =
OL_MAX
CC_MAX
CC_MAX
OL_MAX
_MAX
OL_MAX
CC_MAX
OL_MAX
L
CC
L
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
85357AG-11
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REV. D OCTOBER 4, 2010
8
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
RELIABILITY INFORMATION
TABLE 9. θJAVS. AIR FLOW TABLE FOR 20 LEAD TSSOP
θJA byVelocity (Linear Feet per Minute)
0
200
98.0°C/W
66.6°C/W
500
88.0°C/W
63.5°C/W
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
114.5°C/W
73.2°C/W
NOTE: Most modern PCB designs use multi-layered boards.The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for ICS85357-11 is: 413
85357AG-11
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REV. D OCTOBER 4, 2010
9
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
PACKAGE OUTLINE - G SUFFIX FOR 20 LEAD TSSOP
TABLE 10. PACKAGE DIMENSIONS
Millimeters
Minimum Maximum
SYMBOL
N
A
20
--
1.20
0.15
1.05
0.30
0.20
6.60
A1
A2
b
0.05
0.80
0.19
0.09
6.40
c
D
E
6.40 BASIC
0.65 BASIC
E1
e
4.30
4.50
L
0.45
0°
0.75
8°
α
aaa
--
0.10
Reference Document: JEDEC Publication 95, MO-153
85357AG-11
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REV. D OCTOBER 4, 2010
10
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
TABLE 11. ORDERING INFORMATION
Part/Order Number
85357AG-11
Marking
Package
Shipping Packaging
tube
Temperature
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
85357AG11
85357AG11
85357A11L
85357A11L
20 lead TSSOP
85357AG-11T
20 lead TSSOP
2500 tape & reel
tube
85357AG-11LF
85357AG-11LFT
Lead-Free, 20 lead TSSOP
Lead-Free, 20 lead TSSOP
2500 tape & reel
NOTE: Parts that are ordered with an "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated DeviceTechnology, Inc.(IDT) assumes no responsibility for either its use or for 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 and industrial
applications.Any other applications such as those requiring high reliability, or other extraordinary environmental requirements are not recommended without additional processing by IDT. IDT reserves
the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.
85357AG-11
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REV. D OCTOBER 4, 2010
11
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
REVISION HISTORY SHEET
Description of Change
Rev
Table
Page
Date
A
8
5
Added Termination for LVPECL Outputs section.
5/30/02
3.3V Output Load Test Circuit Diagram, corrected VEE = -1.3V 0.135V
to read VEE = -1.3V 0.165V.
A
B
8/26/02
1/16/03
6
3
Revised Output Rise/Fall Time Diagram.
LVCMOS table - changed VIH from 3.765 Max. to VCC + 0.3 Max.
T4B
T4C
T6
3
4
LVPECL table - changed VSWING from 0.85V Max. to 1.0V Max.
AC table - deleted tPD, tsk(pp) and Notes 1 and 2.
Updated format.
1
Changed maximum crystal frequency from 25MHz to 27MHz.
Changed Output Frequency bullet from 25MHz to 27MHz.
2
3
Pin Characteristics Table - changed CIN from 4pF max. to 4pF typical.
T2
T5
C
10/7/04
Crystal Characteristics Table - changed maximum Frequency from 25MHz to
27MHz.
AC Characteristics Table - changed maximum Output Frequency Range from
25MHz to 27MHz.
3
T6
1
2
3
Features Section - added lead-free bullet.
T2
Pin Characteristics Table - deleted RPullup row.
T4C
LVPECL 3.3V DC Characteristics Table -corrected VOH max. from VCC - 1.0V to
D
D
VCC - 0.9V.
4/12/07
10/4/10
7 - 8
Power Considerations - corrected power dissipation to reflect VOH max in Table
4C.
T11
T11
11
11
13
Ordering Information Table - added lead-free part number, and note.
Updated datasheet's header/footer with IDT from ICS.
Ordering Information Table - removed ICS prefix from Part/Order Number
column. Added LF marking.
Added Contact Page.
85357AG-11
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REV. D OCTOBER 4, 2010
12
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
We’ve Got Your Timing Solution.
6024 Silver Creek Valley Road
San Jose, CA 95138
Sales
Tech Support
netcom@idt.com
800-345-7015 (inside USA)
+408-284-8200 (outside USA)
Fax: 408-284-2775
© 2010 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT, the IDT logo, ICS and HiPerClockS are trademarks of Integrated Device Technology, Inc.
Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of
their respective owners.
Printed in USA
85357AG-11
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REV. D OCTOBER 4, 2010
13
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