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Numéro de référence | C9851 | ||
Description | Clock Generator | ||
Fabricant | Cypress Semiconductor | ||
Logo | |||
1 Page
www.DataSheet4U.com
PRELIMINARY
C9851
Clock Generator for PentiumIII Server and Workstation Applications
Product Features
• Six pairs of current referenced differential clocks
• Two 3V 180° displaced Mref clocks for DRCG
• One 66.6 MHz reference output
• One 14.318 MHz reference output
• Select logic for Differential Swing Control, Test
mode, Hi-Z, Power-down, Spread spectrum, and
limited frequency select
• Cypress Spread Spectrum for EMI reduction
• 48 Pin SSOP Package
Frequency Selection Table
SEL 100/133 SELA SELB CPU(1:6), CPU#(1:6)
0 00
100 MHz
0 01
100 MHz
0 10
200 MHz
0 11
Hi-Z
1 0 0 133.3 MHz
1 01
25 MHz
1 10
200 MHz
1 11
REF/2
Block Diagram
Product Description
This device provides the necessary clocks for a
differential host bus system in multi-processor servers
and workstations. It also generates a 66.6MHz hub
clock for interfacing with a complimentary part, the
Cypress B9852. The 2 Mref clock outputs are 180
degrees out of phase and are used for interfacing with
the Direct Rambus Clock Generator (DRCG), C9820,
C9821, or C9822. This device integrates the Cypress
spread spectrum technology for optimum EMI
reduction.
3VMref,
3Vmref_b
50 MHz
Low
50 MHz
Hi-Z
66.67 MHz
50 MHz
66.7 MHz
REF/4
Table 1
3V66
66.67 MHz
Low
66.67 MHz
Hi-Z
66.67 MHz
66.67 MHz
66.67 MHz
REF
Pin Configuration
REF
14.318 MHz
Low
14.318 MHz
Hi-Z
14.318 MHz
14.318 MHz
14.318 MHz
REF
XIN OSC
XOUT
MultSel(0:1)
Spread#
SelA
SelB
SEL100/133
VCO
PwrDwn#
I
Control
VDDR
REF
VSSR
VDDA
I_Ref
VSSI
CPU (1:6)
CPU (1:6)#
VDDM
3VMRef
3VMRef_b
VSSM
VDDL
3V66
VSSL
VSSR
Ref
VDDR
XIN
XOUT
VSSR
VDDM
3VMref
3VMref_b
VSSM
VDD
VSS
VDDL
3V66
VSSL
SEL100/133
MultSel0
MultSel1
VDDA
VSSA
SelA
SelB
Spread#
PwrDwn#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48 VDD
47 VSS
46 VDDC
45 CPU1
44 CPU1#
43 VSSC
42 CPU2
41 CPU2#
40 VDDC
39 CPU3
38 CPU3#
37 VSSC
36 CPU4
35 CPU4#
34 VDDC
33 CPU5
32 CPU5#
31 VSSC
30 CPU6
29 CPU6#
28 VDDC
27 I_Ref
26 VSSA
25 VDDA
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07068 Rev. **
05/04/2001
Page 1 of 14
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Pages | Pages 14 | ||
Télécharger | [ C9851 ] |
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