IDT2308A
3.3VZERODELAYCLOCKMULTIPLIER
COMMERCIALANDINDUSTRIALTEMPERATURERANGES
3.3V ZERO DELAY CLOCK
MULTIPLIER
IDT2308A
FEATURES:
DESCRIPTION:
• 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
TheIDT2308Aisahigh-speedphase-lockloop(PLL)clockmultiplier.Itis
designedtoaddresshigh-speedclockdistributionandmultiplicationapplica-
tions.Thezerodelayisachievedbyaligningthephasebetweentheincoming
clockandtheoutputclock,operablewithintherangeof10to133MHz.
TheIDT2308Ahastwobanksoffouroutputseachthatarecontrolledviatwo
selectaddresses.Byproperselectionofinputaddresses,bothbankscanbe
put in tri-state mode. In test mode, the PLL is turned off, and the input clock
directlydrives theoutputs forsystemtestingpurposes.Intheabsenceofan
input clock, the IDT2308A enters power down. In this mode, the device will
• 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
drawlessthan12µAforCommercialTemperaturerangeandlessthan25µA
forIndustrialtemperaturerange,andtheoutputsaretri-stated.
The IDT2308A is available in six unique configurations for both pre-
scaling and multiplication of the Input REF Clock. (See available options
table.)
ThePLLisclosedexternallytoprovidemoreflexibilitybyallowingtheuser
tocontrolthedelaybetweentheinputclockandtheoutputs.
TheIDT2308AischaracterizedforbothIndustrialandCommercialopera-
tion.
– 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
FUNCTIONALBLOCKDIAGRAM
(-3, -4)
16
2
FBK
REF
2
CLKA1
PLL
1
3
CLKA2
14
CLKA3
15
CLKA4
8
9
S2
S1
Control
Logic
2
(-2, -3)
6
CLKB1
CLKB2
CLKB3
CLKB4
7
10
11
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
JULY 2004
1
c
2004 Integrated Device Technology, Inc.
DSC 6587/9