83904AGI-02 [IDT]

Clock Generator, PDSO16;
83904AGI-02
型号: 83904AGI-02
厂家: INTEGRATED DEVICE TECHNOLOGY    INTEGRATED DEVICE TECHNOLOGY
描述:

Clock Generator, PDSO16

光电二极管 外围集成电路
文件: 总15页 (文件大小:748K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
LOW SKEW, 1-TO-4, CRYSTAL-TO-  
LVCMOS/LVTTL FANOUT BUFFER  
ICS83904I-02  
GENERAL DESCRIPTION  
FEATURES  
The ICS83904I-02 is a low skew, high perfor-  
Four LVCMOS/LVTTL outputs,  
ICS  
mance 1-to-4 Crystal Oscillator/Crystal-to-LVCMOS  
Fanout Buffer and a member of the HiPerClockS™  
family of High Performance Clock Solutions from IDT.  
The ICS83904I-02 has selectable single-ended clock  
19Ω typical output impedance @ VDD = VDDO = 3.3V  
HiPerClockS™  
Two Crystal oscillator input pairs  
One LVCMOS/LVTTL clock input  
or two crystal-oscillator inputs. There is an output enable to  
disable the outputs by placing them into a high-impedance state.  
Crystal input frequencry range: 12MHz – 38.88MHz  
Output frequency: 200MHz (maximum)  
Guaranteed output and part-to-part skew characteristics  
make the ICS83904I-02 ideal for those applications demand-  
ing well defined performance and repeatability.  
Output Skew: 40ps (maximum) @ VDD = VDDO = 3.3V  
• RMS phase jitter @ 25MHz output, using a 25MHz crystal  
(100Hz – 1MHz): 0.16ps (typical) @ VDD = VDDO = 3.3V  
• RMS phase noise at 25MHz:  
Offset  
Noise Power  
100Hz ............. -118.4 dBc/Hz  
1kHz ............. -141.5 dBc/Hz  
10kHz ............. -157.2 dBc/Hz  
100kHz ............. -157.2 dBc/Hz  
Supply Voltage Modes:  
(Core/Output)  
3.3V/3.3V  
3.3V/2.5V  
3.3V/1.8V  
2.5V/2.5V  
2.5V/1.8V  
-40°C to 85°C ambient operating temperature  
BLOCK DIAGRAM  
Available in both standard (RoHS 5) and lead-free (RoHS 6)  
packages  
Pullup  
OE  
Pulldown  
CLK_SEL0  
Pulldown  
CLK_SEL1  
PIN ASSIGNMENT  
XTAL_IN0  
OSC  
Q0  
Q1  
Q2  
Q3  
1
0 0  
CLK_SEL0  
XTAL_OUT0  
XTAL_IN0  
VDD  
XTAL_IN1  
XTAL_OUT1  
CLK_SEL1  
CLK  
16  
15  
14  
13  
12  
11  
10  
9
VDDO  
Q0  
Q1  
GND  
Q2  
Q3  
2
3
4
5
6
7
8
XTAL_OUT0  
VDDO  
OE  
XTAL_IN1  
OSC  
0 1  
ICS83904I-02  
16-Lead TSSOP  
4.4mm x 5.0mm x 0.92mm  
package body  
XTAL_OUT1  
Pulldown  
1 0  
1 1  
CLK  
G Package  
Top View  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
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ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
TABLE 1. PIN DESCRIPTIONS  
Number  
Name  
Type  
Description  
CLK_SEL0,  
CLK_SEL1  
XTAL_OUT0,  
XTAL_IN0  
Clock select inputs. See Table 3, Input Reference Function Table.  
LVCMOS / LVTTL interface levels.  
Crystal oscillator interface. XTAL_IN0 is the input.  
XTAL_OUT0 is the output.  
1, 7  
Input Pulldown  
2, 3  
4
Input  
Power  
Input  
VDD  
Core supply pin.  
XTAL_IN1,  
XTAL_OUT1  
Crystal oscillator interface. XTAL_IN1 is the input.  
XTAL_OUT1 is the output.  
5, 6  
8
CLK  
Input Pulldown Single-ended clock input. LVCMOS/LVTTL interface levels.  
Output enable. When LOW, outputs are in HIGH impedance state.  
9
OE  
Input  
Pullup  
When HIGH, outputs are active. LVCMOS / LVTTL interface levels.  
10, 16  
VDDO  
Power  
Output supply pins.  
11, 12, 14, 15 Q3, Q2, Q1, Q0 Output  
13 GND Power  
Single-ended clock outputs. LVCMOS/LVTTL interface levels.  
Power supply ground.  
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 Pullup Resistor  
4
51  
51  
8
pF  
kΩ  
kΩ  
pF  
pF  
pF  
Ω
RPULLUP  
RPULLDOWN Input Pulldown Resistor  
VDDO = 3.465V  
VDDO = 2.625V  
VDDO = 2.0V  
Power Dissipation Capacitance  
(per output)  
CPD  
7
7
V
DDO = 3.3V  
19  
21  
32  
ROUT  
Output Impedance  
VDDO = 2.5V  
VDDO = 1.8V  
Ω
Ω
TABLE 3. INPUT REFERENCE FUNCTION TABLE  
Control Inputs  
Reference  
CLK_SEL1  
CLK_SEL0  
0
0
1
1
0
1
0
1
XTAL0 (default)  
XTAL1  
CLK  
CLK  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
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ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
ABSOLUTE MAXIMUM RATINGS  
NOTE: Stresses beyond those listed under Absolute  
Maximum Ratings may cause permanent damage to the  
device.These ratings are stress specifications only. Functional op-  
eration 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 ex-  
tended periods may affect product reliability.  
Supply Voltage, VDD  
4.6V  
Inputs, V  
-0.5V to VDD + 0.5 V  
-0.5V to VDDO + 0.5V  
100.3°C/W (0 mps)  
-65°C to 150°C  
I
Outputs, VO  
Package Thermal Impedance, θ  
JA  
Storage Temperature, T  
STG  
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 3.3V 5ꢀ, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
VDD  
Core Supply Voltage  
3.135  
3.135  
3.3  
3.3  
3.465  
V
VDDO  
Output Supply Voltage  
Power Supply Current  
Output Supply Current  
3.465  
V
No Load & XTALx selected @ 12MHz  
No Load & CLK selected  
7
1
1
mA  
mA  
mA  
IDD  
IDDO  
No Load & CLK selected  
TABLE 4B. POWER SUPPLY DC CHARACTERISTICS, VDD = 3.3V 5ꢀ, VDDO = 2.5V 5ꢀ, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
VDD  
Core Supply Voltage  
3.135  
2.375  
3.3  
2.5  
3.465  
V
VDDO  
Output Supply Voltage  
Power Supply Current  
Output Supply Current  
2.625  
V
No Load & XTALx selected @ 12MHz  
No Load & CLK selected  
7
1
1
mA  
mA  
mA  
IDD  
IDDO  
No Load & CLK selected  
TABLE 4C. POWER SUPPLY DC CHARACTERISTICS, VDD = 3.3V 5ꢀ, VDDO = 1.8V 0.2V, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
VDD  
Core Supply Voltage  
3.135  
1.6  
3.3  
1.8  
3.465  
V
VDDO  
Output Supply Voltage  
Power Supply Current  
Output Supply Current  
2.0  
7
V
No Load & XTALx selected @ 12MHz  
No Load & CLK selected  
mA  
mA  
mA  
IDD  
1
IDDO  
No Load & CLK selected  
1
TABLE 4D. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 2.5V 5ꢀ, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
VDD  
Core Supply Voltage  
2.375  
2.375  
2.5  
2.5  
2.625  
V
VDDO  
Output Supply Voltage  
Power Supply Current  
Output Supply Current  
2.625  
V
No Load & XTALx selected @ 12MHz  
No Load & CLK selected  
3
1
1
mA  
mA  
mA  
IDD  
IDDO  
No Load & CLK selected  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
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ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
TABLE 4E. POWER SUPPLY DC CHARACTERISTICS, VDD = 2.5V 5ꢀ, VDDO = 1.8V 0.2V, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
VDD  
Core Supply Voltage  
2.375  
1.6  
2.5  
1.8  
2.625  
V
VDDO  
Output Supply Voltage  
Power Supply Current  
Output Supply Current  
2.0  
3
V
No Load & XTALx selected @ 12MHz  
No Load & CLK selected  
mA  
mA  
mA  
IDD  
1
IDDO  
No Load & CLK selected  
1
TABLE 4F. DC CHARACTERISTICS, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
VDD = 3.3V 5ꢀ  
VDD = 2.5V 5ꢀ  
VDD = 3.3V 5ꢀ  
VDD = 2.5V 5ꢀ  
2.2  
1.6  
VDD + 0.3  
VDD + 0.3  
1.3  
V
V
V
V
VIH  
VIL  
Input High Voltage  
Input Low Voltage  
-0.3  
-0.3  
0.9  
CLK,  
CLK_SEL0:1  
V
DD = 3.3V or 2.5V 5ꢀ  
VDD = 3.3V or 2.5V 5ꢀ  
DD = 3.3V or 2.5V 5ꢀ  
150  
5
µA  
µA  
µA  
IIH  
Input High Current  
Input Low Current  
OE  
CLK,  
CLK_SEL0:1  
V
-5  
IIL  
OE  
VDD = 3.3V or 2.5V 5ꢀ  
VDDO = 3.3V 5ꢀ; NOTE 1  
-150  
2.6  
µA  
V
VOH  
Output HighVoltage  
Output Low Voltage  
V
DDO = 2.5V 5ꢀ; NOTE 1  
DDO = 1.8V 0.2V; NOTE 1  
VDDO = 3.3V 5ꢀ; NOTE 1  
DDO = 2.5V 5ꢀ; NOTE 1  
DDO = 1.8V 0.2V; NOTE 1  
1.8  
V
V
1.2  
V
0.6  
0.5  
0.4  
V
VOL  
V
V
V
V
NOTE 1: Outputs terminated with 50Ω to VDDO/2. See Parameter Measurement section, "Load Test Circuit" diagrams.  
TABLE 5. CRYSTAL CHARACTERISTICS  
Parameter  
Test Conditions  
Minimum Typical Maximum  
Units  
Mode of Oscillation  
Frequency  
Fundamental  
12  
38.88  
MHz  
Ω
Equivalent Series Resistance (ESR)  
Shunt Capacitance  
Drive Level  
50  
7
pF  
1
mW  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
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ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
TABLE 6A. AC CHARACTERISTICS, VDD = VDDO = 3.3V 5ꢀ, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
w/external XTAL  
w/external CLK  
12  
38.88  
200  
MHz  
MHz  
fMAX  
tpLH  
Output Frequency  
Propagation Delay, Low-to-High;  
1.4  
1.9  
2.4  
ns  
NOTE 1  
tsk(o)  
Output Skew; NOTE 2  
40  
ps  
ps  
tsk(pp)  
Part-to-Part Skew; NOTE 2, 3  
700  
RMS Phase Jitter, Random;  
NOTE 2, 4  
25MHz, Integration Range:  
100Hz – 1MHz  
tjit(Ø)  
0.16  
ps  
tR / tF  
Output Rise/Fall Time  
20ꢀ to 80ꢀ  
100  
45  
800  
55  
ps  
w/external XTAL  
w/external CLK  
Output  
Duty Cycle  
odc  
ƒ< 150MHz  
46  
54  
10  
10  
tEN  
Output Enable Time; NOTE 5  
Output Disable Time; NOTE 5  
ns  
ns  
tDIS  
NOTE 1: Measured from VDD/2 of the input to VDDO/2 of the output.  
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.  
NOTE 3: Defined as skew between outputs on different devices operating a the same supply voltages and  
with equal load conditions. Using the same type of input on each device, the output is measured at VDDO/2.  
NOTE 4: Phase jitter is dependent on the input source used.  
NOTE 5: These parameters are guaranteed by characterization. Not tested in production.  
TABLE 6B. AC CHARACTERISTICS, VDD = 3.3V 5ꢀ, VDDO = 2.5V 5ꢀ, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
w/external XTAL  
w/external CLK  
12  
38.88  
200  
MHz  
MHz  
fMAX  
tpLH  
Output Frequency  
Propagation Delay, Low-to-High;  
1.5  
2.0  
2.5  
ns  
NOTE 1  
tsk(o)  
Output Skew; NOTE 2  
40  
ps  
ps  
tsk(pp)  
Part-to-Part Skew; NOTE 2, 3  
700  
RMS Phase Jitter, Random;  
NOTE 2, 4  
25MHz, Integration Range:  
100Hz - 1MHz  
tjit(Ø)  
0.16  
ps  
tR / tF  
Output Rise/Fall Time  
20ꢀ to 80ꢀ  
100  
45  
800  
55  
ps  
w/external XTAL  
w/external CLK  
Output  
Duty Cycle  
odc  
ƒ< 150MHz  
46  
54  
10  
10  
tEN  
Output Enable Time; NOTE 5  
Output Disable Time; NOTE 5  
ns  
ns  
tDIS  
NOTE 1: Measured from VDD/2 of the input to VDDO/2 of the output.  
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.  
NOTE 3: Defined as skew between outputs on different devices operating a the same supply voltages and  
with equal load conditions. Using the same type of input on each device, the output is measured at VDDO/2.  
NOTE 4: Phase jitter is dependent on the input source used.  
NOTE 5: These parameters are guaranteed by characterization. Not tested in production.  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
5
ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
TABLE 6C. AC CHARACTERISTICS, VDD = 3.3V 5ꢀ, VDDO = 1.8V 0.2V, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
w/external XTAL  
w/external CLK  
12  
38.88  
200  
MHz  
MHz  
fMAX  
tpLH  
Output Frequency  
Propagation Delay, Low-to-High;  
1.7  
2.2  
2.7  
ns  
NOTE 1  
tsk(o)  
Output Skew; NOTE 2  
40  
ps  
ps  
tsk(pp)  
Part-to-Part Skew; NOTE 2, 3  
700  
RMS Phase Jitter, Random;  
NOTE 2, 4  
25MHz, Integration Range:  
100Hz - 1MHz  
tjit(Ø)  
0.16  
ps  
tR / tF  
Output Rise/Fall Time  
20ꢀ to 80ꢀ  
100  
45  
1000  
55  
ps  
w/external XTAL  
w/external CLK  
Output  
Duty Cycle  
odc  
ƒ< 150MHz  
46  
54  
tEN  
Output Enable Time; NOTE 5  
Output Disable Time; NOTE 5  
10  
ns  
ns  
tDIS  
10  
NOTE 1: Measured from VDD/2 of the input to VDDO/2 of the output.  
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.  
NOTE 3: Defined as skew between outputs on different devices operating a the same supply voltages and  
with equal load conditions. Using the same type of input on each device, the output is measured at VDDO/2.  
NOTE 4: Phase jitter is dependent on the input source used.  
NOTE 5: These parameters are guaranteed by characterization. Not tested in production.  
TABLE 6D. AC CHARACTERISTICS, VDD = VDDO = 2.5V 5ꢀ, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
w/external XTAL  
w/external CLK  
12  
38.88  
200  
MHz  
MHz  
fMAX  
tpLH  
Output Frequency  
Propagation Delay, Low-to-High;  
1.5  
2.2  
3.0  
ns  
NOTE 1  
tsk(o)  
Output Skew; NOTE 2  
40  
ps  
ps  
tsk(pp)  
Part-to-Part Skew; NOTE 2, 3  
700  
RMS Phase Jitter, Random;  
NOTE 2, 4  
25MHz, Integration Range:  
100Hz - 1MHz  
tjit(Ø)  
0.20  
ps  
tR / tF  
Output Rise/Fall Time  
20ꢀ to 80ꢀ  
100  
45  
800  
55  
ps  
w/external XTAL  
w/external CLK  
Output  
Duty Cycle  
odc  
ƒ< 150MHz  
48  
52  
tEN  
Output Enable Time; NOTE 5  
Output Disable Time; NOTE 5  
10  
10  
ns  
ns  
tDIS  
NOTE 1: Measured from VDD/2 of the input to VDDO/2 of the output.  
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.  
NOTE 3: Defined as skew between outputs on different devices operating a the same supply voltages and  
with equal load conditions. Using the same type of input on each device, the output is measured at VDDO/2.  
NOTE 4: Phase jitter is dependent on the input source used.  
NOTE 5: These parameters are guaranteed by characterization. Not tested in production.  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
6
ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
TABLE 6E. AC CHARACTERISTICS, VDD = 2.5V 5ꢀ, VDDO = 1.8V 0.2V, TA = -40°C TO 85°C  
Symbol Parameter  
Test Conditions  
Minimum Typical Maximum Units  
w/external XTAL  
w/external CLK  
12  
38.88  
200  
MHz  
MHz  
fMAX  
tpLH  
Output Frequency  
Propagation Delay, Low-to-High;  
1.7  
2.5  
3.3  
ns  
NOTE 1  
tsk(o)  
Output Skew; NOTE 2  
40  
ps  
ps  
tsk(pp)  
Part-to-Part Skew; NOTE 2, 3  
700  
RMS Phase Jitter, Random;  
NOTE 2, 4  
25MHz, Integration Range:  
100Hz - 1MHz  
tjit(Ø)  
0.19  
ps  
tR / tF  
Output Rise/Fall Time  
20ꢀ to 80ꢀ  
100  
45  
1000  
55  
ps  
w/external XTAL  
w/external CLK  
Output  
Duty Cycle  
odc  
ƒ< 150MHz  
46  
54  
tEN  
Output Enable Time; NOTE 5  
Output Disable Time; NOTE 5  
10  
ns  
ns  
tDIS  
10  
NOTE 1: Measured from VDD/2 of the input to VDDO/2 of the output.  
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.  
NOTE 3: Defined as skew between outputs on different devices operating a the same supply voltages and  
with equal load conditions. Using the same type of input on each device, the output is measured at VDDO/2.  
NOTE 4: Phase jitter is dependent on the input source used.  
NOTE 5: These parameters are guaranteed by characterization. Not tested in production.  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
7
ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
TYPICAL PHASE NOISE AT 25MHZ  
0
-10  
-20  
25MHz  
RMS Phase Jitter (Random)  
100Hz to 1MHz = 0.16ps (typical)  
-30  
-40  
-50  
-60  
-70  
-80  
-90  
-100  
-110  
-120  
-130  
-140  
-150  
-160  
Raw Phase Noise Data  
-170  
-180  
-190  
100  
1k  
10k  
100k  
1M  
OFFSET FREQUENCY (HZ)  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
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ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
PARAMETER MEASUREMENT INFORMATION  
1.65V 5ꢀ  
1.25V 5ꢀ  
SCOPE  
SCOPE  
VDD,  
VDDO  
VDD,  
VDDO  
Qx  
Qx  
LVCMOS  
GND  
LVCMOS  
GND  
-1.65V 5ꢀ  
-1.25V 5ꢀ  
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT  
2.5V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT  
2.4V 0.065V  
0.9V 0.1V  
2.05V 5ꢀ  
1.25V 5ꢀ  
SCOPE  
VDD  
SCOPE  
VDD  
VDDO  
VDDO  
GND  
Qx  
Qx  
GND  
LVCMOS  
LVCMOS  
-1.25V 5ꢀ  
-0.9V 0.1V  
3.3V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT  
3.3V CORE/1.8V OUTPUT LOAD AC TEST CIRCUIT  
1.6V 0.025V  
0.9V 0.1V  
Part 1  
Qx  
VDDO  
2
SCOPE  
VDD  
VDDO  
Qx  
Part 2  
Qy  
VDDO  
GND  
2
LVCMOS  
tsk(pp)  
-0.9V 0.1V  
2.5 CORE/1.8V OUTPUT LOAD AC TEST CIRCUIT  
PART-TO-PART SKEW  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
9
ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
VDDO  
Qx  
2
VDD  
2
VDD  
2
CLK  
VDDO  
2
VDDO  
2
VDDO  
2
Qy  
Q0:Q3  
tpLH  
tpHL  
tsk(o)  
PROPAGATION DELAY  
OUTPUT SKEW  
VDDO  
2
Q0:Q3  
tPW  
80ꢀ  
tF  
80ꢀ  
tR  
tPERIOD  
20ꢀ  
20ꢀ  
tPW  
Clock  
Outputs  
x 100ꢀ  
odc =  
tPERIOD  
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD  
OUTPUT RISE/FALL TIME  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
10  
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LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
APPLICATION INFORMATION  
CRYSTAL INPUT INTERFACE  
Figure 1 shows an example of ICS83904I-02 crystal interface  
with a parallel resonant crystal. The frequency accuracy can be  
fine tuned by adjusting the C1 and C2 values. For a parallel crystal  
with loading capacitance CL = 18pF, we suggest C1 = 15pF and  
C2 = 15pF to start with. These values may be slightly fine tuned  
further to optimize the frequency accuracy for different board  
layouts.Slightly increasing the C1 and C2 values will slightly reduce  
the frequency.Slightly decreasing the C1 and C2 values will slightly  
increase the frequency. For the oscillator circuit below, R1 can be  
used, but is not required. For new designs, it is recommended  
that R1 not be used.  
XTAL_IN  
C1  
15p  
X1  
18pF Parallel Crystal  
0
XTAL_OUT  
C2  
R1 (optional)  
15p  
FIGURE 1. Crystal Input Interface  
LVCMOS TO XTAL INTERFACE  
impedance of the driver (Ro) plus the series resistance (Rs) equals  
the transmission line impedance. In addition, matched termination  
at the crystal input will attenuate the signal in half. This can be  
done in one of two ways. First, R1 and R2 in parallel should equal  
the transmission line impedance. For most 50Ω applications, R1  
and R2 can be 100Ω.This can also be accomplished by removing  
R1 and making R2 50Ω.  
The XTAL_IN input can accept a single-ended LVCMOS signal  
through an AC coupling capacitor. A general interface diagram is  
shown in Figure 2. The XTAL_OUT pin can be left floating. The  
input edge rate can be as slow as 10ns. For LVCMOS inputs, it is  
recommended that the amplitude be reduced from full swing to  
half swing in order to prevent signal interference with the power  
rail and to reduce noise.This configuration requires that the output  
VDD  
VDD  
R1  
.1uf  
Ro  
Rs  
Zo = 50  
XTAL_IN  
R2  
Zo = Ro + Rs  
XTAL_OUT  
FIGURE 2. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
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LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS  
INPUTS:  
CRYSTAL INPUTS  
OUTPUTS:  
LVCMOS OUTPUTS  
For applications not requiring the use of the crystal oscillator input,  
both XTAL_IN and XTAL_OUT can be left floating. Though not  
required, but for additional protection, a 1kΩ resistor can be tied  
from XTAL_IN to ground.  
All unused LVCMOS output can be left floating. There should be  
no trace attached.  
CLK INPUT  
For applications not requiring the use of the clock input, it can be  
left floating. Though not required, but for additional protection, a  
1kΩ resistor can be tied from the CLK input to ground.  
SELECT PINS  
All select pins have internal pull-ups and pull-downs; additional  
resistance is not required but can be added for additional  
protection. A 1kΩ resistor can be used.  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
12  
ICS83904AGI-02 REV. A AUGUST 21, 2007  
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RELIABILITY INFORMATION  
TABLE 7. θ VS. AIR FLOW TABLE FOR 16 LEAD TSSOP  
JA  
θ by Velocity (Linear Feet per Minute)  
JA  
0
1
2.5  
Multi-Layer PCB, JEDEC Standard Test Boards  
100.3°C/W  
96.0°C/W  
93.9°C/W  
TRANSISTOR COUNT  
The transistor count for ICS83904I-02 is: 205  
PACKAGE OUTLINE - G SUFFIX FOR 16 LEAD TSSOP  
TABLE 8. PACKAGE DIMENSIONS  
Millimeters  
SYMBOL  
Minimum  
Maximum  
N
A
16  
--  
1.20  
0.15  
1.05  
0.30  
0.20  
5.10  
A1  
A2  
b
0.05  
0.80  
0.19  
0.09  
4.90  
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  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
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ICS83904AGI-02 REV. A AUGUST 21, 2007  
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LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
TABLE 9. ORDERING INFORMATION  
Part/Order Number  
ICS83904AGI-02  
Marking  
3904AI02  
3904AI02  
904AI02L  
904AI02L  
Package  
Shipping Packaging  
tube  
Temperature  
-40°C to 85°C  
-40°C to 85°C  
-40°C to 85°C  
-40°C to 85°C  
16 Lead TSSOP  
ICS83904AGI-02T  
ICS83904AGI-02LF  
ICS83904AGI-02LFT  
16 Lead TSSOP  
2500 tape & reel  
tube  
16 Lead "Lead-Free" TSSOP  
16 Lead "Lead-Free" 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 Device Technology, Incorporated (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.  
IDT/ ICSLVCMOS/LVTTL FANOUT BUFFER  
14  
ICS83904AGI-02 REV. A AUGUST 21, 2007  
ICS83904I-02  
LOW SKEW, 1-TO-4, CRYSTAL-TO-LVCMOS/LVTTL FANOUT BUFFER  
Innovate with IDT and accelerate your future networks. Contact:  
www.IDT.com  
For Sales  
800-345-7015  
408-284-8200  
Fax: 408-284-2775  
For Tech Support  
netcom@idt.com  
480-763-2056  
Corporate Headquarters  
Integrated Device Technology, Inc.  
6024 Silver Creek Valley Road  
San Jose, CA 95138  
Asia Pacific and Japan  
Integrated Device Technology  
Singapore (1997) Pte. Ltd.  
Reg. No. 199707558G  
435 Orchard Road  
Europe  
IDT Europe, Limited  
321 Kingston Road  
Leatherhead, Surrey  
KT22 7TU  
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Singapore 238877  
+44 (0) 1372 363 339  
Fax: +44 (0) 1372 378851  
+65 6 887 5505  
© 2007 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  

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