IDTCV123 Datasheet, PDF (1/16 Pages) Integrated Device Technology – PROGRAMMABLE FLEXPC CLOCK FOR P4 PROCESSOR

IDTCV123
PROGRAMMABLE FLEXPC™ CLOCK FOR P4 PROCESSOR
COMMERCIAL TEMPERATURE RANGE
PROGRAMMABLE FLEXPC™
CLOCK FOR P4 PROCESSOR
IDTCV123
FEATURES:
• One high precision PLL for CPU, with SSC and N program-
mable
• One high precision PLL for SRC/PCI/SATA, SSC and N pro-
grammable
• One high precision PLL for 96MHz/48MHz
• Band-gap circuit for differential outputs
• Supports spread spectrum modulation, down spread 0.5%
• Supports SMBus block read/write, index read/write
• Selectable output strength for REF
• Allows for CPU frequency to change to a higher frequency for
maximum system computing power
• Available in SSOP package
OUTPUTS:
• 2*0.7V current –mode differential CPU CLK pair
• 8*0.7V current –mode differential SRC CLK pair, one dedicated
for SATA
• One CPU_ITP/SRC selectable CLK pair
• 8*PCI, 3 free running, 33.3MHz
• 1*96MHz,1*48MHz
• 2*REF
DESCRIPTION:
IDTCV123 is a 56 pin clock device. The CPU output buffer is designed to
support up to 400MHz processor. This chip has three PLLs inside for CPU/
SRC/PCI, SATA, and 48MHz/DOT96 IO clocks. One dedicated PLL for Serial
ATA clock provides high accuracy frequency. This device also implements
Band-gap referenced IREF to reduce the impact of VDD variation on differential
outputs, which can provide more robust system performance.
Static PLL frequency divide error can be as low as 36 ppm, worse case 114
ppm, providing high accuracy output clock. Each CPU/SRC/PCI, SATA clock
has its own Spread Spectrum selection, which allows for isolated changes
instead of affecting other clock groups.
KEY SPECIFICATION:
• CPU/SRC CLK cycle to cycle jitter < 85ps
• SATA CLK cycle to cycle jitter < 85ps
• PCI CLK cycle to cycle jitter < 250ps
• Static PLL frequency divide error < 114 ppm
• Static PLL frequency divide error for 48MHz < 5 ppm
FUNCTIONAL BLOCK DIAGRAM
X1
X2
SDATA
SCLK
XTAL
Osc Amp
SM Bus
Controller
VTT_PWRGD#/PD
FSA.B.C
Control
Logic
PLL1
SSC
N Programmable
CPU CLK
Output Buffers
Stop Logic
IREF
ITP_EN
PLL2
SSC
N Programmable
SRC CLK
Output Buffer
Stop Logic
IREF
PLL3
48MHz/96MHz
Output BUffer
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
1
© 2004 Integrated Device Technology, Inc.
CPU[1:0]
CPU_ITP/SRC6
REF[0:1]
SRC[6:0]
SATA_SRC
PCI[5:0], PCIF[2:0]
48MHz
DOT96
MAY 2004
DSC-6538/4