Z9953 Datasheet, PDF (1/6 Pages) Cypress Semiconductor – 3.3V, 180MHz, Multi-Output Zero Delay Buffer

Product Features
• 110MHz Clock Support
• Supports PowerPC^TM, Intel and RISC Processors
• 9 Clock Outputs: drive up to 18 loads
• LVPECL Reference Input Clock
• Output Disable Control
• Spread Spectrum Compatible
• 3.3V Power Supply
• Pin Compatible with MPC953
• Industrial Temp. Range: -40°C to +85°C
• 32-Pin TQFP Package
Block Diagram
Z9953
3.3V, 180MHz, Multi-Output Zero Delay Buffer
Frequency Table
BYPASS# PLL_EN VCO_SEL Q(0:7)
0
0
0 REF
0
0
1 REF
0
1
0 REF
0
1
1 REF
1
0
0 REF/4
1
0
1 REF/8
1
1
0 VCO/4
1
1
1 VCO/8
Table 1
FB_OUT
REF
REF
REF
REF
REF/4
REF/8
VCO/4
VCO/8
Function Table
BYPASS#
MR/OE#
VCO_SEL
PLL_EN
‘1’ = PLL Enabled
‘0’ = PLL Bypass
‘1’ = Outputs Disabled HiZ
‘0’ = Outputs Enabled
‘1’ = VCO/2
‘0’ = VCO
‘1’ = Select VCO
‘0’ = Select PECL_CLK
Table 2
Pin Configuration
PECL_CLK
PECL_CLK#
FB_IN
VCO_SEL
BYPASS#
MR/OE#
PLL_EN
Phase
Detector
VCO
200-500M
LPF
/4
/2
FB_OUT
7 Q(0:6)
Q7
Figure 1
VDD 1
FB_IN 2
NC 3
NC 4
NC 5
NC 6
VSS 7
PECL_CLK 8
Z9953
24 Q1
23 VDDC
22 Q2
21 VSS
20 Q3
19 VDDC
18 Q4
17 VSS
Cypress Semiconductor Corporation
http://www.cypress.com
Document#: 38-07086 Rev. *B
12/26/2002
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