ICS85357AG-11T [ICSI]
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V LVPECL / ECL MULTIPLEXER; 4 ：1或2 ： 1 ，晶体振荡器- TO- 3.3V LVPECL / ECL复用器
| 型号： | ICS85357AG-11T |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | 4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V LVPECL / ECL MULTIPLEXER |
| 文件： | 总12页 (文件大小：117K) |
| 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
Integrated
Circuit
Systems, Incꢀ
GENERAL DESCRIPTION
FEATURES
The ICS85357-11 is a 4:1 or 2:1, Crystal • 1 differential 3.3V LVPECLoutput
Oscillator-to-3.3V LVPECL/ ECL Multiplexer and
is a member of the HiPerClockS™ family of High
Performance Clock Solutions from ICS. The
• 4:1 or 2:1 Crystal Oscillator Multiplexer
HiPerClockS™
• Supports parallel resonant crystals with a frequency range
of 10MHz - 25MHz. The oscillator circuit is optimized for
parallel resonant mode, and will require external capacitance
ICS85357-11 has
4 selectable crystal
inputs. The device can support 10MHz - 25MHz 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).
• Maximum output frequency up to 25MHz
• LVCMOS SEL0 and SEL1 inputs have internal pulldown
resistors
• Part-to-part skew: 150ps (maximum)
• Propagation delay: 2ns (maximum)
• LVPECLmode 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
BLOCK DIAGRAM
PIN ASSIGNMENT
VCC
XTALIN0
XTALOUT0
XTALIN1
XTALOUT1
XTALIN2
XTALOUT2
XTALIN3
XTALOUT3
VEE
1
2
3
4
20
19
18
17
16
15
14
13
12
11
VCC
SEL1
SEL0
VCC
Q0
nQ0
VCC
nc
XTALIN0
5
6
7
8
9
10
00
01
OSC
OSC
OSC
OSC
XTALOUT0
XTALIN1
nc
VEE
Q0
nQ0
XTALOUT1
XTALIN2
ICS85357-11
20-Lead TSSOP
4.40mm x 6.50mm x 0.92mm body package
G Package
10
11
XTALOUT2
XTALIN3
Top View
XTALOUT3
SEL1 SEL0
85357AG-11
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REV. A JULY 25, 2001
1
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
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. Connect to 3.3V.
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. Connect to ground.
No connect.
nc
Unused
Output
Input
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 refers 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 SEL0, SEL1
Input Pullup Resistor
Input Pulldown Resistor
4
pF
KΩ
KΩ
RPULLUP
RPULLDOWN
51
51
TABLE 3A. CONTROL INPUT FUNCTION TABLE
Inputs
Clock Out
CLK
SEL1
SEL0
0
0
1
1
0
1
0
1
XTALIN0, XTALOUT0
XTALIN1, XTALOUT1
XTALIN2, XTALOUT2
XTALIN3, XTALOUT3
85357AG-11
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REV. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC
Inputs, VI
4.6V
-0.5V to VCC + 0.5V
-0.5V to VCC + 0.5V
Outputs, VO
Package Thermal Impedance, θJA
Storage Temperature, TSTG
73.2°C/W (0lfpm)
-65°C to 150°C
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 beyond those listed in the
DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended peri-
ods may affect product reliability.
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VCC = 3.3V±5%, TA = 0°C TO 70°C
Symbol
VCC
Parameter
Test Conditions
Minimum
Typical
Maximum Units
Positive Supply Voltage
Power Supply Current
3.135
3.3
3.465
50
V
IEE
mA
TABLE 4B. LVCMOS / LVTTL DC CHARACTERISTICS, VCC = 3.3V±5%, TA = 0°C TO 70°C
Symbol
Parameter
Test Conditions
Minimum
Typical
Maximum Units
VIH
VIL
IIH
Input High Voltage SEL0, SEL1
Input Low Voltage SEL0, SEL1
Input High Current SEL0, SEL1
Input Low Current SEL0, SEL1
2
3.765
0.8
V
V
-0.3
VCC = VIN = 3.465V
150
µA
µA
IIL
VCC = 3.465V, VIN = 0V
-5
TABLE 4C. LVPECL DC CHARACTERISTICS, VCC = 3.3V±5%, 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 - 1.0
VCC - 1.7
0.85
V
V
V
VOL
VSWING
NOTE 1: Outputs terminated with 50Ω to VCC - 2V.
85357AG-11
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REV. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
TABLE 5. CRYSTAL CHARACTERISTICS
Parameter
Test Conditions
Minimum Typical Maximum
Units
Mode of Oscillation / cut
Frequency
Fundamental / Parallel Resonant
10
50
25
80
7
MHz
Ω
Equivalent Series Resistance (ESR)
Shunt Capacitance
pF
nH
°C
Series Pin Inductance
Operating Temperature Range
3
0
7
70
TABLE 6. AC CHARACTERISTICS, VCC = 3.3V±5%, TA=0°C TO 70°C
Symbol Parameter Test Conditions
fMAX Output Frequency Range
tPD Propagation Delay; NOTE 1
tsk(pp) Part-to-Part Skew; NOTE 2, 4
Minimum
Typical
Maximum Units
10
1
25
2
MHz
ns
IJ 25MHz
150
700
700
53
ps
tR
Output Rise Time
20% to 80%
20% to 80%
300
300
47
ps
tF
Output Fall Time
ps
odc
Output Duty Cycle; NOTE 3, 4
%
oscTOL Crystal Oscillator Tolerance; NOTE 3
All parameters measured at 25MHz unless noted otherwise.
±20
ppm
NOTE 1: Measured from the differential input crossing point to the differential output crossing point.
Measured overdriving the XTAL input.
NOTE 2: Defined as skew between outputs on different devices operating at the same supply voltages
and with equal load conditions. Using the same type of inputs on each device, the outputs are measured
at the differential cross points. Measured overdriving the XTAL input.
NOTE 3: Measured using C1 = 22pF and C2 = 27pF in parallel with 18pF crystals. Refer to Figure 6 in the
Application Section.
NOTE 4: This parameter is defined in accordance with JEDEC Standard 65.
85357AG-11
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REV. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
PARAMETER MEASUREMENT INFORMATION
VCC
SCOPE
Qx
LVPECL
VCC = 2.0V
nQx
VEE = -1.3V ± 0.135V
FIGURE 1 - OUTPUT LOAD TEST CIRCUIT
Q0
PART 1
nQ0
Q0
PART 2
nQ0
tsk(pp)
FIGURE 2 - PART-TO-PART SKEW
85357AG-11
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REV. A JULY 25, 2001
5
ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
80%
80%
VSWING
20%
20%
Clock Inputs
and Outputs
tR
tF
FIGURE 3 - INPUT AND OUTPUT RISE AND FALL TIME
VCC/2
XTALINx
nQ0
Q0
tPD
FIGURE 4 - PROPAGATION DELAY
Q0
nQ0
Pulse Width
tPERIOD
tPW
odc =
tPERIOD
FIGURE 5 - odc & tPERIOD
85357AG-11
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REV. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
APPLICATION INFORMATION
CRYSTAL INPUT INTERFACE
Acrystal 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
suitable for most applications. Additional accuracy can be achieved by adding two small capacitors C1 and C2 as shown in Figure 6.
Typical results using parallel 18pF crystals are shown in Table 7.
XTAL_IN
C1
22p
X1
18pF Parallel Crystal
XTAL_OUT
C2
27p
Figure 6. 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. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
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 + 5% = 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 = 30.2mW/Loaded Output pair
Total Power_MAX (3.465V, with all outputs switching) = 173.3mW + 30.2mW = 203.5mW
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 HiPerClockSTM devices is 125°C.
The equation for Tj is as follows: Tj = θJA * Pd_total + TA
Tj = Junction Temperature
θJA = junction-to-ambient thermal resistance
Pd_total = Total device power dissipation (example calculation is in section 1 above)
TA =Ambient Temperature
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 per Table 6 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.204W * 66.6°C/W = 83.6°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 qJA for 20-pin TSSOP, Forced Convection
qJA by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards 114.5°C/W
98.0°C/W
66.6°C/W
88.0°C/W
63.5°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
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. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
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 7.
VCC
Q1
VOUT
RL
50
VCC - 2V
FIGURE 7 - 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 of V - 2V.
CC
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
Pd_L = [(V
– (V
- 2V))/R ] * (V
- V
)
OH_MAX
CC_MAX
CC_MAX
OH_MAX
L
– (V
- 2V))/R ] * (V
- V
)
OL_MAX
CC_MAX
CC_MAX
OL_MAX
L
•
•
For logic high, V = V
= V
– 1.0V
OUT
OH_MAX
CC_MAX
Using V
= 3.465, this results in V
= 2.465V
= 1.765V
CC_MAX
OH_MAX
For logic low, V = V
= V
– 1.7V
OUT
OL_MAX
CC_MAX
Using V
= 3.465, this results in V
OL_MAX
CC_MAX
Pd_H = [(2.465V - (3.465V - 2V))/50Ω] * (3.465V - 2.465V) = 20mW
Pd_L = [(1.765V - (3.465V - 2V))/50Ω] * (3.465V - 1.765V) = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW
85357AG-11
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REV. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
RELIABILITY INFORMATION
TABLE 9. θJAVS. AIR FLOW TABLE
qJA by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards 114.5°C/W
Multi-Layer PCB, JEDEC Standard Test Boards 73.2°C/W
98.0°C/W
66.6°C/W
88.0°C/W
63.5°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. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
PACKAGE OUTLINE - G SUFFIX
TABLE 10. PACKAGE DIMENSIONS
Millimeters
SYMBOL
MIN
MAX
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. A JULY 25, 2001
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ICS85357-11
4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V
LVPECL / ECL MULTIPLEXER
Integrated
Circuit
Systems, Incꢀ
TABLE 11. ORDERING INFORMATION
Part/Order Number
ICS85357AG-11
Marking
Package
Count
72 per tube
2500
Temperature
0°C to 70°C
0°C to 70°C
ICS85357AG11
ICS85357AG11
20 lead TSSOP
ICS85357AG-11T
20 lead TSSOP on Tape and Reel
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) 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 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.
85357AG-11
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REV. A JULY 25, 2001
12
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