PLL702-02 Datasheet, PDF (1/7 Pages) PhaseLink Corporation – Low EMI Peripheral Clock Generator for Notebook & Motherboards

PLL702-02
Low EMI Peripheral Clock Generator for Notebook & Motherboards
FEATURES
• Single Low EMI IC to replace multiple crystals and
oscillators on Notebooks and Motherboards (27MHz,
10MHz, 14.318MHz, 8MHz, 12MHz, 24.576MHz,
25MHz).
• Selectable crystal input: 24.576MHz or 14.318MHz
(accuracy requirement +/- 20ppm)
• Less than 10ppm Frequency Synthesis error, meeting
AC97, IEEE1394, IEEE802 and USB2.0 frequency
precision specification.
• 27MHz clock with 5 levels of Selectable Spread
Spectrum modulation form +/- 0.5% to +/- 1.5% center.
• 25MHz clock with double drive strength (Ethernet PHY
and MAC).
• 24.576MHz clocks for Audio Codec and IEEE1394.
• 12MHz for USB 2.0.
• Selectable 10MHz and 8MHz for Keyboard controller.
• Dual power source selection for 24.576MHz, 10MHz,
and 12MHz.
• Available in 16-Pin SOIC or TSSOP.
Table 1. SPREAD SPECTRUM SELECTION
SST1
SST0
SST Modulation only on
27MHz. (pin 15)
1
1
+/- 1.5 %
1
0
+/- 1.25 %
1
M
+/- 1 %
0
1
+/- 0.75 %
0
0
+/- 0.5 %
0
M
SST OFF (Default)
Notes: M = Do not connect. 1 = Pulled up. 0 = Pulled down.
Table 2. POWER SELECTION TABLE
VDD_SEL
0
1
24.576MHz
(pin 7)
VDDB1
VDD25M
12MHz
(pin 12)
VDDB2
VDD25M
PIN ASSIGNMENT
VDDOSC 1
XIN 2
XOUT 3
VSSOSC 4
VSSB1 5
24.576MHz/SST0*^T 6
24.576MHz/SST1*^v 7
VDDB1 8
16 VDDB2
15
27_14.318MHz/XTAL_SEL*^v
14 VSSB2
13
10_8MHz/SEL10_8*^T
12
12MHz/VDD_SEL*^v
11 VSS25M
10 25MHzx2
9 VDD25M
Note: 25MHzx2: double drive strength
*: Bi-directional pin
v_{: Internal pull-down resistor (120kΩ)} T_{: Tri-level input}
POWER GROUPS
• VDDOSC – VSSOSC: XIN, XOUT, analog core and
digital part.
• VDDB1 – VSSB1: 24.576MHz.
• VDDB2 – VSSB2: 27MHz, 10_8MHz, and 12MHz.
• VDD25M – VSS25M: 25MHz, (10_8MHz, 12MHz,
24.576MHz when power VDDB1, VDDB2 not present).
Table 3. FREQUENCY SELECTION TABLE
SEL10_8
M
1
0
10_8MHz ( pin 13 )
Power Source Output Frequency
VDD25M
8MHz
VDDB2
OFF
10MHz
-
Table 4. CRYSTAL SELECTION TABLE
Crystal Input
24.576MHz
14.318MHz
XTAL_SEL
0
1
47745 Fremont Blvd., Fremont, California 94538 Tel [phone] Fax [phone] www.phaselink.com Rev 08/30/05 Page 1