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| 型号： | MPC940LFA |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | 940 SERIES, LOW SKEW CLOCK DRIVER, 18 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32 |
| 封装： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件页数： | 1/10页 |
| 文件大小： | 292K |
| 代理商： | MPC940LFA |
MPC940L
Rev. 5, 09/2005
Freescale Semiconductor
Technical Data
Freescale Semiconductor, Inc., 2005. All rights reserved.
Low Voltage 1:18 Clock Distribution
Chip
The MPC940L is a 1:18 low voltage clock distribution chip with 2.5 V or 3.3 V
LVCMOS output capabilities. The device features the capability to select either a
differential LVPECL or an LVCMOS compatible input. The 18 outputs are 2.5 V
or 3.3 V LVCMOS compatible and feature the drive strength to drive 50
series
or parallel terminated transmission lines. With output-to-output skews of 150 ps,
the MPC940L is ideal as a clock distribution chip for the most demanding of
synchronous systems. The 2.5 V outputs also make the device ideal for
supplying clocks for a high performance microprocessor based design. For a
similar device at a lower price/performance point, the reader is referred to the
MPC9109.
LVPECL or LVCMOS Clock Input
2.5 V LVCMOS Outputs for Pentium II Microprocessor Support
150 ps Maximum Output-to-Output Skew
Maximum Output Frequency of 250 MHz
32-Lead LQFP Packaging
32-Lead Pb-Free Package Available
Dual or Single Supply Device:
Dual VCC Supply Voltage, 3.3 V Core and 2.5 V Output
Single 3.3 V VCC Supply Voltage for 3.3 V Outputs
Single 2.5 V VCC Supply Voltage for 2.5 V I/O
With a low output impedance (
≈20 ), in both the HIGH and LOW logic states,
the output buffers of the MPC940L are ideal for driving series terminated
transmission lines. With a 20
output impedance the 940L has the capability of
driving two series terminated lines from each output. This gives the device an
effective fanout of 1:36. If a lower output impedance is desired please see the
MPC942 data sheet.
The differential LVPECL inputs of the MPC940L allow the device to interface directly with a LVPECL fanout buffer like the
MC100EP111 to build very wide clock fanout trees or to couple to a high frequency clock source. The LVCMOS input provides a
more standard interface for applications requiring only a single clock distribution chip at relatively low frequencies. In addition,
the two clock sources can be used to provide for a test clock interface as well as the primary system clock. A logic HIGH on the
LVCMOS_CLK_SEL pin will select the LVCMOS level clock input. All inputs of the MPC940L have internal pullup/pulldown
resistors so they can be left open if unused.
The MPC940L is a single or dual supply device. The device power supply offers a high degree of flexibility. The device can
operate with a 3.3 V core and 3.3 V output, a 3.3 V core and 2.5 V outputs as well as a 2.5 V core and 2.5 V outputs. The 32-
lead LQFP package was chosen to optimize performance, board space and cost of the device. The 32-lead LQFP has a 7x7 mm
body size with a conservative 0.8 mm pin spacing.
MPC940L
LOW VOLTAGE
1:18 CLOCK
DISTRIBUTION CHIP
FA SUFFIX
32-LEAD LQFP PACKAGE
CASE 873A-04
AC SUFFIX
32-LEAD LQFP PACKAGE
Pb-FREE PACKAGE
CASE 873A-04
Pentium II is a trademark of Intel Corporation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC940LFAR2 | 功能描述:时钟驱动器及分配 FSL 1-18 LVCMOS/LVPE CL to LVCMOS Fanout RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MPC941 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:LOW VOLTAGE 1:27 CLOCK DISTRIBUTION CHIP |
| MPC941AE | 功能描述:时钟驱动器及分配 FSL 1-27 LVCMOS Fanout Buffer RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MPC941AER2 | 功能描述:时钟驱动器及分配 FSL 1-27 LVCMOS Fanout Buffer RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MPC941FA | 功能描述:时钟驱动器及分配 2.5 3.3V 250MHz Clock Generator RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
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