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PDF B9947 Data sheet ( Hoja de datos )
| Número de pieza | B9947 | |
| Descripción | 1:9 Clock Distribution Buffer | |
| Fabricantes | Cypress Semiconductor | |
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B9947
3.3V, 160-MHz, 1:9 Clock Distribution Buffer
Product Features
• 160-MHz Clock Support
• LVCMOS/LVTTL Compatible Inputs
• 9 Clock Outputs: Drive up to 18 Clock Lines
• Synchronous Output Enable
• Output Three-state Control
• 350-ps Maximum Output-to-Output Skew
• Pin Compatible with MPC947
• Industrial Temp. Range: –40°C to +85°C
• 32-Pin TQFP Package
Description
The B9947 is a low-voltage clock distribution buffer with the
capability to select one of two LVCMOS/LVTTL compatible
clock inputs. The two clock sources can be used to provide for
a test clock as well as the primary system clock. All other con-
trol inputs are LVCMOS/LVTTL compatible. The nine outputs
are 3.3V LVCMOS or LVTTL compatible and can drive two
series terminated 50Ω transmission lines. With this capability
the B9947 has an effective fanout of 1:18. The outputs can
also be three-stated via the three-state input TS#. Low out-
put-to-output skews make the B9947 an ideal clock distribu-
tion buffer for nested clock trees in the most demanding of
synchronous systems.
The B9947 also provides a synchronous output enable input
for enabling or disabling the output clocks. Since this input is
internally synchronized to the input clock, potential output
glitching or runt pulse generation is eliminated.
Block Diagram
Pin Configuration
TCLK0
TCLK1
TCLK_SEL
SYNC_OE
TS#
VDD
0
1
VDDC
9 Q0-Q8
VSS
TCLK_SEL
TCLK0
TCLK1
SYNC_OE
TS#
VDD
VSS
1
2
3
4
5
6
7
8
B9947
24 VSS
23 Q3
22 VDDC
21 Q4
20 VSS
19 Q5
18 VDDC
17 VSS
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Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-07078 Rev. *C
Revised December 22, 2002
1 page  
B9947
Document Title: B9947 3.3V, 160-MHz, 1:9 Clock Distribution Buffer
Document Number: 38-07078
REV.
ECN NO.
Issue
Date
Orig. of
Change
Description of Change
**
107114 06/06/01
IKA Convert from IMI to Cypress
*A
108058 07/03/01
NDP Changed Commercial to Industrial (See page 6)
*B 109804 01/31/02 DSG Convert from Word to Frame
*C
122763 12/22/02
RBI Add power up requirements to maximum ratings information
www.DataSheet4U.com
Document #: 38-07078 Rev. *C
Page 5 of 5
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet B9947.PDF ] | |
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