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PDF B9948 Data sheet ( Hoja de datos )
| Número de pieza | B9948 | |
| Descripción | 1:12 Clock Distribution Buffer | |
| Fabricantes | Cypress Semiconductor | |
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B9948
3.3V, 160-MHz, 1:12 Clock Distribution Buffer
Features
Description
• 160-MHz clock support
• LVPECL or LVCMOS/LVTTL clock input
• LVCMOS/LVTTL compatible inputs
• 12 clock outputs: drive up to 24 clock lines
• Synchronous Output Enable
• Output three-state control
• 350-ps maximum output-to-output skew
• Pin compatible with MPC948
• Industrial temp. range: –40°C to +85°C
• 32-pin TQFP package
Block Diagram
The B9948 is a low-voltage clock distribution buffer with the
capability to select either a differential LVPECL or a LVC-
MOS/LVTTL compatible input clock. The two clock sources
can be used to provide for a test clock as well as the primary
system clock. All other control inputs are LVCMOS/LVTTL
compatible. The twelve outputs are 3.3V LVCMOS or LVTTL
compatible and can drive two series terminated 50Ω transmis-
sion lines. With this capability the B9948 has an effective
fan-out of 1:24. The outputs can also be three-stated via the
three-state input TS#. Low output-to-output skews make the
B9948 an ideal clock distribution buffer for nested clock trees
in the most demanding of synchronous systems.
The B9948 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.
Pin Configuration
PECL_CLK
PECL_CLK#
TCLK
TCLK_SEL
SYNC_OE
TS#
VDD
0
1
VDDC
12 Q0-Q11
TCLK_SEL
TCLK
PECL_CLK
PECL_CLK#
SYNC_OE
TS#
VDD
VSS
1
2
3
4
5
6
7
8
B9948
24 VSS
23 Q4
22 VDDC
21 Q5
20 VSS
19 Q6
18 VDDC
17 Q7
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Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-07079 Rev. *D
Revised December 14, 2002
1 page  
Package Drawing and Dimensions
32-Lead Thin Plastic Quad Flatpack 7 x 7 x 1.0mm A32
B9948
51-85063-B
All product and company names mentioned in this document may be the trademarks of their respective holders.
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Document #: 38-07079 Rev. *D
Page 5 of 6
© Cypress Semiconductor Corporation, 2002. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize
its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet B9948.PDF ] | |
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