View IDT2308A-1_687169.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
3.3V ZERO DELAY CLOCK MULTIPLIER
FEATURES:
IDT2308A
* Phase-Lock Loop Clock Distribution for Applications ranging from 10MHz to 133MHz operating frequency * Distributes one clock input to two banks of four outputs * Separate output enable for each output bank * External feedback (FBK) pin is used to synchronize the outputs to the clock input * Output Skew <200 ps * Low jitter <200 ps cycle-to-cycle * 1x, 2x, 4x output options (see table): - IDT2308A-1 1x - IDT2308A-2 1x, 2x - IDT2308A-3 2x, 4x - IDT2308A-4 2x - IDT2308A-1H and -2H for High Drive * No external RC network required * Operates at 3.3V VDD * Available in SOIC and TSSOP packages
DESCRIPTION:
The IDT2308A is a high-speed phase-lock loop (PLL) clock multiplier. It is designed to address high-speed clock distribution and multiplication applications. The zero delay is achieved by aligning the phase between the incoming clock and the output clock, operable within the range of 10 to 133MHz. The IDT2308A has two banks of four outputs each that are controlled via two select addresses. By proper selection of input addresses, both banks can be put in tri-state mode. In test mode, the PLL is turned off, and the input clock directly drives the outputs for system testing purposes. In the absence of an input clock, the IDT2308A enters power down. In this mode, the device will draw less than 12A for Commercial Temperature range and less than 25A for Industrial temperature range, and the outputs are tri-stated. The IDT2308A is available in six unique configurations for both prescaling and multiplication of the Input REF Clock. (See available options table.) The PLL is closed externally to provide more flexibility by allowing the user to control the delay between the input clock and the outputs. The IDT2308A is characterized for both Industrial and Commercial operation.
FUNCTIONAL BLOCK DIAGRAM
(-3, -4) FBK REF 3 CLKA2 16 1 2 PLL 2 CLKA1
14 CLKA3 15 CLKA4
S2 S1
8 9 Control Logic (-2, -3) 2 6 CLKB1 7
CLKB2
10 CLKB3 11 CLKB4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
c 2004 Integrated Device Technology, Inc.
JULY 2004
DSC 6587/8
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VDD Rating Supply Voltage Range Input Voltage Range (REF) Input Voltage Range (except REF) IIK (VI < 0) IO (VO = 0 to VDD) VDD or GND TA = 55C (in still air)(3) TSTG Operating Temperature Operating Storage Temperature Range Commercial Temperature Range Industrial Temperature Range -40 to +85 C -65 to +150 0 to +70 C C Continuous Current Maximum Power Dissipation 100 0.7 mA W Input Clamp Current Continuous Output Current Max. -0.5 to +4.6 -0.5 to +5.5 -0.5 to VDD+0.5 -50 50 mA mA Unit V V V VI (2) VI
REF CLKA1 CLKA2 VDD GND CLKB1 CLKB2 S2
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
FBK CLKA4 CLKA3 VDD GND CLKB4 CLKB3 S1
SOIC/ TSSOP TOP VIEW
Temperature
PIN DESCRIPTION
Pin Number REF (1) CLKA1(2) CLKA2 VDD GND CLKB1 S2(3) S1(3) CLKB3 CLKB4 GND VDD CLKA3(2) CLKA4(2) FBK
(2) (2) (2) (2)
NOTES: 1. Stresses greater than those listed under ABSOLUTE 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 indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 3. The maximum package power dissipation is calculated using a junction temperature of 150C and a board trace length of 750 mils.
Functional Description Input Reference Clock, 5 Volt Tolerant Input Clock Output for Bank A Clock Output for Bank A 3.3V Supply Ground Clock Output for Bank B Clock Output for Bank B Select Input, Bit 2 Select Input, Bit 1 Clock Output for Bank B Clock Output for Bank B Ground 3.3V Supply Clock Output for Bank A Clock Output for Bank A PLL Feedback Input
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
CLKB2(2)
APPLICATIONS:
* * * * *
SDRAM Telecom Datacom PC Motherboards/Workstations Critical Path Delay Designs
NOTES: 1. Weak pull down. 2. Weak pull down on all outputs. 3. Weak pull ups on these inputs.
2
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
FUNCTION TABLE(1) SELECT INPUT DECODING
S2 L L H H
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level
S1 L H L H
CLK A Tri-State Driven Driven Driven
CLK B Tri-State Tri-State Driven Driven
Output Source PLL PLL REF PLL
PLL Shut Down Y N Y N
AVAILABLE OPTIONS FOR IDT2308A
Device IDT2308A-1 IDT2308A-1H IDT2308A-2 IDT2308A-2 IDT2308A-2H IDT2308A-2H IDT2308A-3 IDT2308A-3 IDT2308A-4 Feedback From Bank A or Bank B Bank A or Bank B Bank A Bank B Bank A Bank B Bank A Bank B Bank A or Bank B Bank A Frequency Reference Reference Reference 2 x Reference Reference 2 x Reference 2 x Reference 4 x Reference 2 x Reference Bank B Frequency Reference Reference Reference/2 Reference Reference/2 Reference Reference or Reference(1) 2 x Reference 2 x Reference
NOTE: 1. Output phase is indeterminant (0 or 180 from input clock).
ZERO DELAY AND SKEW CONTROL
To close the feedback loop of the IDT2308A, the FBK pin can be driven from any of the eight available output pins. The output driving the FBK pin will be driving a total load of 7pF plus any additional load that it drives. The relative loading of this output (with respect to the remaining outputs) can adjust the input-output delay. For applications requiring zero input-output delay, all outputs including the one providing feedback should be equally loaded. Ensure the outputs are loaded equally, for zero output-output skew.
3
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
OPERATING CONDITIONS- COMMERCIAL
Symbol VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance below 100MHz Load Capacitance from 100MHz to 133MHz Input Capacitance
(1)
Parameter
Test Conditions
Min. 3 0 -- -- --
Max. 3.6 70 30 15 7
Unit V
C
pF pF pF
NOTE: 1. Applies to both REF and FBK.
DC ELECTRICAL CHARACTERISTICS - COMMERCIAL
Symbol VIL VIH IIL IIH VOL VOH IDD_PD Parameter Input LOW Voltage Level Input HIGH Voltage Level Input LOW Current Input HIGH Current Output LOW Voltage Output HIGH Voltage Power Down Current VIN = 0V VIN = VDD IOL = 8mA (-1, -2, -3, -4) IOL = 12mA (-1H, -2H) IOH = -8mA (-1, -2, -3, -4) IOH = -12mA (-1H, -2H) REF = 0MHz (S2 = S1 = H) 100MHz CLKA (-1, -2, -3, -4) 100MHz CLKA (-1H, -2H) IDD Supply Current Unloaded Outputs Select Inputs at VDD or GND 66MHz CLKA (-1, -2, -3, -4) 66MHz CLKA (-1H, -2H) 33MHz CLKA (-1, -2, -3, -4) 33MHz CLKA (-1H, -2H) -- -- -- -- -- -- -- -- -- -- -- -- -- -- 12 45 70 32 50 18 30 mA A 2.4 -- -- V Conditions Min. -- 2 -- -- -- Typ.(1) -- -- -- -- -- Max. 0.8 -- 50 100 0.4 Unit V V A A V
4
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS - COMMERCIAL
Symbol t1 t1 t1 Parameter Output Frequency Output Frequency Output Frequency Duty Cycle = t2 / t1 (-1, -2, -3, -4, -1H, -2H) Duty Cycle = t2 / t1 (-1, -2, -3, -4, -1H, -2H) t3 t3 t3 t4 t4 t4 t5 Rise Time (-1, -2, -3, -4) Rise Time (-1, -2, -3, -4) Rise Time (-1H, -2H) Fall Time (-1, -2, -3, -4) Fall Time (-1, -2, -3, -4) Fall Time (-1H) Output to Output Skew on same Bank (-1, -2, -3, -4) Output to Output Skew (-1H, -2H) Output Bank A to Output Bank B (-1, -4, -2H) Output Bank A to Output Bank B Skew (-2, -3) t6 t7 t8 tJ Delay, REF Rising Edge to FBK Rising Edge Device to Device Skew Output Slew Rate Cycle to Cycle Jitter (-1, -1H, -4)
tJ
Conditions 30pF Load, all devices 20pF Load, -1H, -2H Devices 15pF Load, -1, -2, -3, -4 devices Measured at 1.4V, FOUT = 66.66MHz 30pF Load Measured at 1.4V, FOUT = 50MHz 15pF Load Measured between 0.8V and 2V, 30pF Load Measured between 0.8V and 2V, 15pF Load Measured between 0.8V and 2V, 30pF Load Measured between 0.8V and 2V, 30pF Load Measured between 0.8V and 2V, 15pF Load Measured between 0.8V and 2V, 30pF Load All outputs equally loaded All outputs equally loaded All outputs equally loaded All outputs equally loaded Measured at VDD/2 Measured at VDD/2 on the FBK pins of devices Measured between 0.8V and 2V on -1H, -2H device using Test Circuit 2 Measured at 66.67 MHz, loaded outputs, 15pF Load Measured at 66.67 MHz, loaded outputs, 30pF Load Measured at 133.3 MHz, loaded outputs, 15pF Load Measured at 66.67 MHz, loaded outputs, 30pF Load Measured at 66.67 MHz, loaded outputs, 15pF Load Stable Power Supply, valid clocks presented on REF and FBK pins
Min. 10 10 10 40 45 -- -- -- -- -- -- -- -- -- -- -- -- 1 -- -- -- -- -- --
Typ. -- -- -- 50 50 -- -- -- -- -- -- -- -- -- -- 0 0 -- -- -- -- -- -- --
Max. 100 133.3 133.3 60 55 2.2 1.5 1.5 2.2 1.5 1.25 200 200 200 400 250 700 -- 200 200 100 400 400 1
Unit MHz MHz MHz % % ns ns ns ns ns ns ps ps ps ps ps ps V/ns
ps ps ms
Cycle to Cycle Jitter (-2, -2H, -3) PLL Lock Time
tLOCK
5
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
OPERATING CONDITIONS- INDUSTRIAL
Symbol VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance below 100MHz Load Capacitance from 100MHz to 133MHz Input Capacitance
(1)
Parameter
Test Conditions
Min. 3 -40 -- -- --
Max. 3.6 +85 30 15 7
Unit V
C
pF pF pF
NOTE: 1. Applies to both REF and FBK.
DC ELECTRICAL CHARACTERISTICS - INDUSTRIAL
Symbol VIL VIH IIL IIH VOL VOH IDD_PD Parameter Input LOW Voltage Level Input HIGH Voltage Level Input LOW Current Input HIGH Current Output LOW Voltage Output HIGH Voltage Power Down Current VIN = 0V VIN = VDD IOL = 8mA (-1, -2, -3, -4) IOL = 12mA (-1H, -2H) IOH = -8mA (-1, -2, -3, -4) IOH = -12mA (-1H, -2H) REF = 0MHz (S2 = S1 = H) 100MHz CLKA (-1, -2, -3, -4) 100MHz CLKA (-1H, -2H) IDD Supply Current Unloaded Outputs Select Inputs at VDD or GND 66MHz CLKA (-1, -2, -3, -4) 66MHz CLKA (-1H, -2H) 33MHz CLKA (-1, -2, -3, -4) 33MHz CLKA (-1H, -2H) -- -- -- -- -- -- -- -- -- -- -- -- -- -- 25 45 70 32 50 18 30 mA A 2.4 -- -- V Conditions Min. -- 2 -- -- -- Typ.(1) -- -- -- -- -- Max. 0.8 -- 50 100 0.4 Unit V V A A V
6
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS - INDUSTRIAL
Symbol t1 t1 t1 Parameter Output Frequency Output Frequency Output Frequency Duty Cycle = t2 / t1 (-1, -2, -3, -4, -1H, -2H) Duty Cycle = t2 / t1 (-1, -2, -3, -4, -1H, -2H) t3 t3 t3 t4 t4 t4 t5 Rise Time (-1, -2, -3, -4) Rise Time (-1, -2, -3, -4) Rise Time (-1H, -2H) Fall Time (-1, -2, -3, -4) Fall Time (-1, -2, -3, -4) Fall Time (-1H) Output to Output Skew on same Bank (-1, -2, -3, -4) Output to Output Skew (-1H, -2H) Output Bank A to Output Bank B (-1, -4, -2H) Output Bank A to Output Bank B Skew (-2, -3) t6 t7 t8 tJ Delay, REF Rising Edge to FBK Rising Edge Device to Device Skew Output Slew Rate Cycle to Cycle Jitter (-1, -1H, -4)
tJ
Conditions 30pF Load, all devices 20pF Load, -1H, -2H Devices 15pF Load, -1, -2, -3, -4 devices Measured at 1.4V, FOUT = 66.66MHz 30pF Load Measured at 1.4V, FOUT = 50MHz 15pF Load Measured between 0.8V and 2V, 30pF Load Measured between 0.8V and 2V, 15pF Load Measured between 0.8V and 2V, 30pF Load Measured between 0.8V and 2V, 30pF Load Measured between 0.8V and 2V, 15pF Load Measured between 0.8V and 2V, 30pF Load All outputs equally loaded All outputs equally loaded All outputs equally loaded All outputs equally loaded Measured at VDD/2 Measured at VDD/2 on the FBK pins of devices Measured between 0.8V and 2V on -1H, -2H device using Test Circuit 2 Measured at 66.67 MHz, loaded outputs, 15pF Load Measured at 66.67 MHz, loaded outputs, 30pF Load Measured at 133.3 MHz, loaded outputs, 15pF Load Measured at 66.67 MHz, loaded outputs, 30pF Load Measured at 66.67 MHz, loaded outputs, 15pF Load Stable Power Supply, valid clocks presented on REF and FBK pins
Min. 10 10 10 40 45 1
Typ. 50 50 0 0
Max. 100 133.3 133.3 60 55 2.2 1.5 1.5 2.2 1.5 1.25 200 200 200 400 250 700 200 200 100 400 400 1
Unit MHz MHz MHz % % ns ns ns ns ns ns ps ps ps ps ps ps V/ns
ps ps ms
Cycle to Cycle Jitter (-2, -2H, -3) PLL Lock Time
tLOCK
7
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
SWITCHING WAVEFORMS
t1 t2 1.4V 1.4V 1.4V
Duty Cycle Timing
Output
0.8V t3
2V
2V
0.8V t4
3.3V 0V
All Outputs Rise/Fall Time
1.4V Output Output t5 1.4V
Output to Output Skew
Input FBK t6
VDD/2
VDD/2
Input to Output Propagation Delay
FBK, Device 1 FBK, Device 2
VDD/2
t7
VDD/2
Device to Device Skew
8
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
TEST CIRCUITS
TEST CIRCUIT 1
TEST CIRCUIT 2
VDD 0.1F OUTPUTS
VDD CLKOUT CLOAD 0.1F OUTPUTS
1K
CLKOUT 10pF
1K VDD 0.1F
VDD 0.1F GND GND
GND
GND
Test Circuit for all Parameters Except t8
Test Circuit for t8, Output Slew Rate On -1H and -2H Devices
9
IDT2308A 3.3V ZERO DELAY CLOCK MULTIPLIER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT XXXXX Device Type XX Package X Process Blank I DC DCG PG PGG 2308A-1 2308A-2 2308A-3 2308A-4 2308A-1H 2308A-2H
Ordering Code IDT2308A-1DC IDT2308A-1DCG IDT2308A-1DCGI IDT2308A-1DCI IDT2308A-1HDC IDT2308A-1HDCG IDT2308A-1HDCGI IDT2308A-1HDCI IDT2308A-1HPG IDT2308A-1HPGG IDT2308A-1HPGGI IDT2308A-1HPGI IDT2308A-2DC IDT2308A-2DCG IDT2308A-2DCGI IDT2308A-2DCI IDT2308A-2HDC IDT2308A-2HDCI IDT2308A-3DC IDT2308A-3DCG IDT2308A-3DCGI IDT2308A-3DCI IDT2308A-4DC IDT2308A-4DCI 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin TSSOP 16-Pin TSSOP 16-Pin TSSOP 16-Pin TSSOP 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC 16-Pin SOIC
Commercial (0oC to +70oC) Industrial (-40oC to +85oC) Small Outline SOIC - Green Thin Shrink Small Outline Package TSSOP - Green
}
}
Zero Delay Clock Buffer with Standard Drive
Zero Delay Clock Buffer with High Drive
Package Type Commercial Commercial Industrial Industrial Commercial Commercial Industrial Industrial Commercial Commercial Industrial Industrial Commercial Commercial Industrial Industrial Commercial Industrial Commercial Commercial Industrial Industrial Commercial Industrial
Operating Range
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 10
for Tech Support: logichelp@idt.com (408) 654-6459

▲Up To Search▲

Price & Availability of IDT2308A-1

	To Download IDT2308A-1 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .