Document
VERY LOW POWER CLOCK FOR 2011 NETBOOKS
DATASHEET
9VRS4338D
General Description
The 9VRS4338D is a main clock for Intel Netbooks, conforming to the CK-NET specification. It is driven with a 14.31818MHz crystal and generates a variety of clocks, including an LCD clock. An SMBus interface allows full control of the device.
Recommended Application
CK-NET
Output Features
• 2 - 0.8V push-pull differential CPU pairs • 3 - 0.8V push-pull differential SRC pairs • 1 - 0.8V push-pull differential SATA/SRC pair • 1 - 0.8V push-pull differential DOT96/SRC pair • 1 - 0.8V push-pull differential LCD100 pair • 1 - 0.8V push-pull differential CPU_ITP/SRC pair • 3 - PCI (33MHz), 1 free-running • 1 - 25MHz _PCI (33MHz) • 1 - USB_48MHz • 1 - REF, 14.318MHz
Pin Configuration
Features/Benefits
• 25M output can run in power down; Supports
Wake_On_LAN
• Selectable spread % on CPU, SRC, PCI; Supports
margining
• External 14.318MHz crystal; Supports tight ppm • CLKREQ# pins; Support SRC power management • Low power differential clock outputs; reduced power and
board space
• Integrated 33 ohm series resistors on all differential
outputs; reduced board space
Key Specifications
• CPU cycle-to-cycle jitter <85ps • SRC/SATA cycle-to-cycle jitter <85ps • SRC(1:4) are PCIe Gen2 compliant • SRC5 is PCIe Gen1 compliant • ±100ppm frequency accuracy on all clocks except 25M • ±30ppm frequency accuracy on 25M
GNDREF CLK PW RGD/PD# _3.3 CP U0_L RS CPU0 #_LRS GNDCPU CPU1 _LRS CP U1#_ LRS VDDCP U_L VIO VDD_CORE_1.5 CPU_ ITP/S RC1_L RS CPU_ITP#/SRC 1#_LRS CPU_ STOP#_ 3.3
48 47 46 45 44 43 42 41 40 39 38 37
X2 1
36 SRC2_LRS
X1 2
35 SRC2#_LRS
VDDREF 3
34 GNDSRC
REF0_2x/FSLC 4
33 SRC3_LRS
SDATA_3.3 5
32 SRC3#_LRS
SCLK_3.3 6 VDDPCI_3.3 7
9VRS4338D
31 PCI_STOP#_3.3 30 VDDSR C_LVIO
vITP_EN/PCI_F1_2x 8
29 SRC4_LRS
FSLB/PCI2_2x 9
28 SRC4#_LRS
CLKREQA#/PCI3_2x 10
27 SATA_LRS
GNDPCI 11
26 SATA#_LRS
GND25 12
25 GNDSATA
13 14 15 16 17 18 19 20 21 22 23 24
v SE L_P CI/25 M_P CI4_2 x VDD2 5 VDD48
vUS B_ 48Mh z_ 2x GND48
CLKR EQB# DO T96_ LRS /SRC5 _LRS DOT9 6#_L RS/S RC5# _LRS
VDD_CORE_1.5 LCD10 0_LRS
LCD 100# _LRS GND LCD
48-pin MLF, 6x6 mm, 0.4mm pitch
v prefix indicates internal 120KOhm pull down resistor ^ prefix indicates internal 120KOhm pull up resistor
IDT® VERY LOW POWER CLOCK FOR 2011 NETBOOKS
1
9VRS4338D
REV A 022616
9VRS4338D VERY LOW POWER CLOCK FOR 2011 NETBOOKS
Pin Descriptions
PIN #
PIN NAME
1 X2
2 X1
3 VDDREF
4 REF0_2x/FSLC
5 SDATA_3.3 6 SCLK_3.3 7 VDDPCI_3.3
8 vITP_EN/PCI_F1_2x
9 FSLB/PCI2_2x
10 CLKREQA#/PCI3_2x 11 GNDPCI 12 GND25
13 vSEL_PCI/25M_PCI4_2x
14 VDD25 15 VDD48 16 vUSB_48Mhz_2x 17 GND48
18 CLKREQB#
19 DOT96_LRS/SRC5_LRS
20 DOT96#_LRS/SRC5#_LRS 21 VDD_CORE_1.5 22 LCD100_LRS 23 LCD100#_LRS 24 GNDLCD
T YPE
D ESC RIPT ION
OUT Crystal output, Nominally 14.318MHz
IN Crystal input, Nominally 14.318MHz.
PWR Ref, XTAL power s upply, nominal 3.3V
I/O 2x strength 14.318 MHz reference cloc k./ 3.3V tolerant input for CPU frequency se.