鈥?/div>
Output frequency up to 125 MHz
Supports PowerPC
廬
, and Pentium
廬
processors
12 clock outputs: frequency configurable
Configurable Output Disable
Two reference clock inputs for dynamic toggling
Oscillator or PECL reference input
Spread spectrum compatible
Glitch-free output clocks transitioning
3.3V power supply
Pin compatible with SC973X
Industrial temperature range: 鈥?0擄C to +85擄C
52-Pin TQFP package
Table 1. Frequency Table
[1]
VC0_SEL
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
.
FB_SEL2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
FB_SEL1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
FB_SEL0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
F
VCO
8x
12x
16x
20x
8x
12x
16x
20x
4x
6x
8x
10x
4x
6x
8x
10x
Note:
1. x = the reference input frequency, 200MHz < F
VCO
< 480MHz
Block Diagram
PECL_CLK
PECL_CLK#
VCO_SEL
PLL_EN
REF_SEL
D Q
TCLK0
TCLK1
TCLK_SEL
FB_IN
D Q
Sync
Frz
0
1
Phase
Detector
LPF
VCO
0
1
Sync
Frz
QA0
QA1
QA2
QA3
QB0
QB1
QB2
QB3
Pin Configuration
52 51 50 49 48 47 46 45 44 43 42 41 40
VSS
MR#/OE
SCLK
SDATA
FB_SEL2
PLL_EN
REF_SEL
TCLK_SEL
TCLK0
TCLK1
PECL_CLK
PECL_CLK#
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
39
38
37
36
35
34
33
32
31
30
29
28
27
VSS
QB0
VDDC
QB1
VSS
QB2
VDDC
QB3
FB_IN
VSS
FB_OUT
VDDC
FB_SEL0
VCO_SEL
SELA0
SELA1
SELB0
SELB1
VDDC
VDDC
QA0
QA1
QA2
QA3
VSS
CY29976
VSS
MR#/OE
Power-On
Reset
SELA(0,1)
SELB(0,1)
SELC(0,1)
FB_SEL(0:2)
SCLK
SDATA
INV_CLK
2
2
2
3
/4, /6, /8, /10
Sync Pulse
Data Generator
D Q
D Q
D Q
/2, /6, /4, /12
/2, /6, /4, /10
/8, /2, /6, /4
D Q
Sync
Frz
QC0
QC1
14 15 16 17 18 19 20 21 22 23 24 25 26
Sync
Frz
Sync
Frz
Sync
Frz
QC2
QC3
FB_OUT
INV_CLK
VSS
QC3
VDDC
QC2
SELC1
SELC0
QC1
VDDC
QC0
VSS
SYNC
FB_SEL1
SYNC
Output Disable
Circuitry
12
Cypress Semiconductor Corporation
Document #: 38-07413 Rev. *A
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?408-943-2600
Revised December 27, 2002
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