IDT2308A-4DCI8 - Integrated Device Technology

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

AUGUST 2012

2012 Integrated Device Technology, Inc. DSC 6587/9c

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FEATURES:

• 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

FUNCTIONAL BLOCK DIAGRAM

DESCRIPTION:

The IDT2308A is a high-speed phase-lock loop (PLL) clock multiplier. It is

designed to address high-speed clock distribution and multiplication applica-

tions. 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 12µA for Commercial Temperature range and less than 25µA

for Industrial temperature range, and the outputs are tri-stated.

The IDT2308A is available in six unique configurations for both pre-

scaling 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 opera-

tion.

IDT2308A

3.3V ZERO DELAY CLOCK

MULTIPLIER

PLL

CLKA1

CLKA2

CLKA3

CLKA4

CLKB1

CLKB2

CLKB3

CLKB4

FBK 16

Control

Logic

REF

(-2, -3)

(-3, -4)

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

PIN CONFIGURATION

SOIC/ TSSOP

TOP VIEW

REF

CLKA1

161

CLKA2

GND

CLKB1

FBK

CLKA4

GND

VDD

CLKB2 CLKB3

CLKB4

CLKA3

Symbol Rating Max. Unit

VDD Supply Voltage Range –0.5 to +4.6 V

VI (2) Input Voltage Range (REF) –0.5 to +5.5 V

VIInput Voltage Range –0.5 to V

(except REF) VDD+0.5

IIK (VI < 0) Input Clamp Current –50 mA

IOContinuous Output Current ±50 mA

(VO = 0 to VDD)

VDD or G N D Continuous Current ±100 mA

TA = 55°C Maximum Power Dissipation 0 .7 W

(in still air)(3)

TSTG Storage Temperature Range –65 to +150 °C

Operating Commercial Temperature 0 to +70 °C

Temperature Range

Operating Industrial Temperature -40 to +85 °C

Temperature Range

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 150°C and a board trace length of 750 mils.

APPLICATIONS:

• SDRAM

• Telecom

• Datacom

• PC Motherboards/Workstations

• Critical Path Delay Designs

Pin Number Functional Description

REF 1 Input Reference Clock, 5 Volt Tolerant Input

CLKA1(1) 2 Clock Output for Bank A

CLKA2(1) 3 Clock Output for Bank A

VDD 4 3.3V Supply

GND 5 Ground

CLKB1(1) 6 Clock Output for Bank B

CLKB2(1) 7 Clock Output for Bank B

S2(2) 8 Select Input, Bit 2

S1(2) 9 Select Input, Bit 1

CLKB3(1) 10 Clock Output for Bank B

CLKB4(1) 11 Clock Output for Bank B

GND 12 Ground

VDD 13 3.3V Supply

CLKA3(1) 14 Clock Output for Bank A

CLKA4(1) 15 Clock Output for Bank A

FBK 1 6 PLL Feedback Input

NOTES:

1. Weak pull down on all outputs.

2. Weak pull ups on these inputs.

PIN DESCRIPTION

ABSOLUTE MAXIMUM RATINGS(1)

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

Device Feedback From Bank A Frequency Bank B Frequency

IDT2308A-1 Bank A or Bank B Reference Reference

IDT2308A-1H Bank A or Bank B Reference Reference

IDT2308A-2 Bank A Reference Reference/2

IDT2308A-2 Bank B 2 x Reference Reference

IDT2308A-2H Bank A Reference Reference/2

IDT2308A-2H Bank B 2 x Reference Reference

IDT2308A-3 Bank A 2 x Reference Reference or Reference(1)

IDT2308A-3 Bank B 4 x Reference 2 x Reference

IDT2308A-4 Bank A or Bank B 2 x Reference 2 x Reference

NOTE:

1. Output phase is indeterminant (0° or 180° from input clock).

AVAILABLE OPTIONS FOR IDT2308A

S2 S1 CLK A CLK B Output Source PLL Shut Down

L L Tri-State Tri-State PLL Y

L H Driven Tri-State PLL N

H L Driven Driven REF Y

H H Driven Driven PLL N

FUNCTION TABLE(1) SELECT INPUT DECODING

NOTE:

1 . H = HIGH Voltage Level

L = LOW Voltage Level

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.

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

DC ELECTRICAL CHARACTERISTICS - COMMERCIAL

Symbol Parameter Conditions Min. Typ.(1) Max. Unit

VIL Input LOW Voltage Level — — 0.8 V

VIH Input HIGH Voltage Level 2 — — V

IIL Input LOW Current VIN = 0V — — 50 µ A

IIH Input HIGH Current VIN = VDD — — 100 µA

VOL Output LOW Voltage IOL = 8mA (-1, -2, -3, -4) — — 0 .4 V

IOL = 12mA (-1H, -2H)

VOH Output HIGH Voltage IOH = -8mA (-1, -2, -3, -4) 2 . 4 — — V

IOH = -12mA (-1H, -2H)

IDD_PD Power Down Current REF = 0MHz (S2 = S1 = H) — — 12 µ A

100MHz CLKA (-1, -2, -3, -4) — — 45

100MHz CLKA (-1H, -2H) — — 70

IDD Supply Current Unloaded Outputs 66MHz CLKA (-1, -2, -3, -4) — — 32 mA

Select Inputs at VDD or GND 66MHz CLKA (-1H, -2H) — — 50

33MHz CLKA (-1, -2, -3, -4) — — 18

33MHz CLKA (-1H, -2H) — — 30

NOTE:

1. Applies to both REF and FBK.

Symbol Parameter Test Conditions Min. Max. Unit

VDD Supply Voltage 3 3.6 V

TAOperating Temperature (Ambient Temperature) 0 70 °C

CLLoad Capacitance below 100MHz — 3 0 pF

Load Capacitance from 100MHz to 133MHz — 1 5 pF

CIN Input Capacitance(1) —7pF

OPERATING CONDITIONS- COMMERCIAL

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

SWITCHING CHARACTERISTICS - COMMERCIAL

Symbol Parameter Conditions Min. Typ. Max. Unit

t1Output Frequency 30pF Load, all devices 1 0 — 100 MHz

t1Output Frequency 20pF Load, -1H, -2H Devices 10 — 133.3 MHz

t1Output Frequency 15pF Load, -1, -2, -3, -4 devices 10 — 133.3 MHz

Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT = 66.66MHz 40 50 60 %

(-1, -2, -3, -4, -1H, -2H) 30pF Load

Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT = 50MHz 45 50 55 %

(-1, -2, -3, -4, -1H, -2H) 15pF Load

t3Rise Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 30pF Load — — 2.2 ns

t3Rise Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 15pF Load — — 1.5 ns

t3Rise Time (-1H, -2H) Measured between 0.8V and 2V, 30pF Load — — 1.5 ns

t4Fall Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 30pF Load — — 2.2 ns

t4Fall Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 15pF Load — — 1.5 ns

t4Fall Time (-1H) Measured between 0.8V and 2V, 30pF Load — — 1.25 ns

t5Output to Output Skew on same Bank All outputs equally loaded — — 200 ps

(-1, -2, -3, -4)

Output to Output Skew (-1H, -2H) All outputs equally loaded — — 200 ps

Output Bank A to Output Bank B (-1, -4, -2H) All outputs equally loaded — — 200 ps

Output Bank A to Output Bank B Skew (-2, -3) All outputs equally loaded — — 400 ps

t6Delay, REF Rising Edge to FBK Rising Edge Measured at VDD/2 — 0 ±250 ps

t7Device to Device Skew Measured at VDD/2 on the FBK pins of devices — 0 7 0 0 p s

t8Output Slew Rate Measured between 0.8V and 2V on -1H, -2H 1 — — V/ns

device using Test Circuit 2

tJCycle to Cycle Jitter Measured at 66.67 MHz, loaded outputs, 15pF Load — — 200

(-1, -1H, -4) Measured at 66.67 MHz, loaded outputs, 30pF Load — — 200 ps

Measured at 133.3 MHz, loaded outputs, 15pF Load — — 100

tJ Cycle to Cycle Jitter Measured at 66.67 MHz, loaded outputs, 30pF Load — — 400 ps

(-2, -2H, -3) Measured at 66.67 MHz, loaded outputs, 15pF Load — — 400

tLOCK PLL Lock Time Stable Power Supply, valid clocks presented — — 1 ms

on REF and FBK pins

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

NOTE:

1. Applies to both REF and FBK.

DC ELECTRICAL CHARACTERISTICS - INDUSTRIAL

Symbol Parameter Conditions Min. Typ.(1) Max. Unit

VIL Input LOW Voltage Level — — 0.8 V

VIH Input HIGH Voltage Level 2 — — V

IIL Input LOW Current VIN = 0V — — 50 µA

IIH Input HIGH Current VIN = VDD — — 100 µA

VOL Output LOW Voltage IOL = 8mA (-1, -2, -3, -4) — — 0.4 V

IOL = 12mA (-1H, -2H)

VOH Output HIGH Voltage IOH = -8mA (-1, -2, -3, -4) 2 . 4 — — V

IOH = -12mA (-1H, -2H)

IDD_PD Power Down Current REF = 0MHz (S2 = S1 = H) — — 25 µ A

100MHz CLKA (-1, -2, -3, -4) — — 45

100MHz CLKA (-1H, -2H) — — 70

IDD Supply Current Unloaded Outputs 66MHz CLKA (-1, -2, -3, -4) — — 32 m A

Select Inputs at VDD or GND 66MHz CLKA (-1H, -2H) — — 50

33MHz CLKA (-1, -2, -3, -4) — — 18

33MHz CLKA (-1H, -2H) — — 30

Symbol Parameter Test Conditions Min. Max. Unit

VDD Supply Voltage 3 3.6 V

TAOperating Temperature (Ambient Temperature) -40 +85 °C

CLLoad Capacitance below 100MHz — 3 0 pF

Load Capacitance from 100MHz to 133MHz — 1 5 pF

CIN Input Capacitance(1) —7pF

OPERATING CONDITIONS- INDUSTRIAL

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

SWITCHING CHARACTERISTICS - INDUSTRIAL

Symbol Parameter Conditions Min. Typ. Max. Unit

t1Output Frequency 30pF Load, all devices 1 0 ⎯100 MHz

t1Output Frequency 20pF Load, -1H, -2H Devices 10 ⎯133.3 MHz

t1Output Frequency 15pF Load, -1, -2, -3, -4 devices 10 ⎯133.3 MHz

Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT = 66.66MHz 40 50 60 %

(-1, -2, -3, -4, -1H, -2H) 30pF Load

Duty Cycle = t2 ÷ t1Measured at 1.4V, FOUT = 50MHz 45 50 55 %

(-1, -2, -3, -4, -1H, -2H) 15pF Load

t3Rise Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 30pF Load ⎯⎯2.2 ns

t3Rise Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 15pF Load ⎯⎯1.5 ns

t3Rise Time (-1H, -2H) Measured between 0.8V and 2V, 30pF Load ⎯⎯1.5 ns

t4Fall Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 30pF Load ⎯⎯2.2 ns

t4Fall Time (-1, -2, -3, -4) Measured between 0.8V and 2V, 15pF Load ⎯⎯1.5 ns

t4Fall Time (-1H) Measured between 0.8V and 2V, 30pF Load ⎯⎯1.25 ns

t5Output to Output Skew on same Bank All outputs equally loaded ⎯⎯200 ps

(-1, -2, -3, -4)

Output to Output Skew (-1H, -2H) All outputs equally loaded ⎯⎯200 ps

Output Bank A to Output Bank B (-1, -4, -2H) All outputs equally loaded ⎯⎯200 ps

Output Bank A to Output Bank B Skew (-2, -3) All outputs equally loaded ⎯⎯400 ps

t6Delay, REF Rising Edge to FBK Rising Edge Measured at VDD/2 ⎯0±250ps

t7Device to Device Skew Measured at VDD/2 on the FBK pins of devices ⎯0 700 ps

t8Output Slew Rate Measured between 0.8V and 2V on -1H, -2H 1 ⎯⎯V/ns

device using Test Circuit 2

tJCycle to Cycle Jitter Measured at 66.67 MHz, loaded outputs, 15pF Load ⎯⎯200

(-1, -1H, -4) Measured at 66.67 MHz, loaded outputs, 30pF Load ⎯⎯200 ps

Measured at 133.3 MHz, loaded outputs, 15pF Load ⎯⎯100

tJ Cycle to Cycle Jitter Measured at 66.67 MHz, loaded outputs, 30pF Load ⎯⎯400 ps

(-2, -2H, -3) Measured at 66.67 MHz, loaded outputs, 15pF Load ⎯⎯400

tLOCK PLL Lock Time Stable Power Supply, valid clocks presented ⎯⎯1ms

on REF and FBK pins

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

Output 1.4V

1.4V

Output

Input VDD/2

FBK

FBK,

Device 1

FBK,

Device 2

VDD/2

1.4V

0.8V

t3 t4

0.8V 3.3V

Output

1.4V 1.4V

SWITCHING WAVEFORMS

Duty Cycle Timing

All Outputs Rise/Fall Time

Output to Output Skew

Input to Output Propagation Delay

Device to Device Skew

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

TEST CIRCUITS

TEST CIRCUIT 1 TEST CIRCUIT 2

Test Circuit for all Parameters Except t8 Test Circuit for t8, Output Slew Rate On -1H and -2H Devices

VDD

OUTPUTS

CLKOUT

CLOAD

VDD

GND GND

0.1 F

VDD

OUTPUTS

10pF

VDD

GND GND

0.1 F

1K CLKOUT

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

IDT2308A

3.3V ZERO DELAY CLOCK MULTIPLIER

ORDERING INFORMATION

IDT XXXXX XX X

Package Process

Device Type

Blank

2308A-1

2308A-2

2308A-3

2308A-4

2308A-1H

2308A-2H

Commercial (0oC to +70oC)

Industrial (-40oC to +85oC)

Zero Delay Clock Buffer with Standard Drive

DCG

PGG

Small Outline

SOIC - Green

Thin Shrink Small Outline Package

TSSOP - Green

Zero Delay Clock Buffer with High Drive

}

Ordering Code Package Type Operating Range

IDT2308A-1DCG 16-Pin SOIC Commercial

IDT2308A-1DCGI 16-Pin SOIC Industrial

IDT2308A-1HDCG 16-Pin SOIC Commercial

IDT2308A-1HDCGI 16-Pin SOIC Industrial

IDT2308A-1HPG 16-Pin TSSOP Commercial

IDT2308A-1HPGG 16-Pin TSSOP Commercial

IDT2308A-1HPGGI 16-Pin TSSOP Industrial

IDT2308A-1HPGI 16-Pin TSSOP Industrial

IDT2308A-2DCG 16-Pin SOIC Commercial

IDT2308A-2DCGI 16-Pin SOIC Industrial

IDT2308A-2HDCG 16-Pin SOIC Commercial

IDT2308A-2HDCGI 16-Pin SOIC Industrial

IDT2308A-3DCG 16-Pin SOIC Commercial

IDT2308A-3DCGI 16-Pin SOIC Industrial

IDT2308A-4DCG 16-Pin SOIC Commercial

IDT2308A-4DCGI 16-Pin SOIC Industrial

CORPORATE HEADQUARTERS for SALES: for Tech Support:

6024 Silver Creek Valley Road 800-345-7015 or 408-284-8200 clockhelp@idt.com

San Jose, CA 95138 fax: 408-284-2775