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參數(shù)資料
| 型號(hào)： | CYW256OXC |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | Multiconductor Paired Security UTP Cable; Number of Conductors:8; Conductor Size AWG:23; No. Strands x Strand Size:Solid; Jacket Material:Polyvinylchloride (PVC); Number of Pairs:4; Impedance:100ohm; Jacket Color:Gray RoHS Compliant: Yes |
| 中文描述： | 256 SERIES, LOW SKEW CLOCK DRIVER, 12 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO28 |
| 封裝： | 5.30 MM, LEAD FREE, SSOP-28 |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 176K |
| 代理商： | CYW256OXC |
12 Output Buffer for 2 DDR and 3 SRAM DIMMS
W256
Cypress Semiconductor Corporation
Document #: 38-07256 Rev. *C
3901 North First Street
San Jose
,
CA 95134
408-943-2600
Revised August 30, 2004
Features
One input to 12 output buffer/drivers
Supports up to 2 DDR DIMMs or 3 SDRAM DIMMS
One additional output for feedback
SMBus interface for individual output control
Low skew outputs (< 100 ps)
Supports 266 MHz and 333 MHz DDR SDRAM
Dedicated pin for power management support
Space-saving 28-pin SSOP package
Functional Description
The W256 is a 3.3V/2.5V buffer designed to distribute
high-speed clocks in PC applications. The part has 12 outputs.
Designers can configure these outputs to support 3 unbuffered
standard SDRAM DIMMs and 2 DDR DIMMs. The W256 can
be used in conjunction with the W250-02 or similar clock
synthesizer for the VIA Pro 266 chipset.
The W256 also includes an SMBus interface which can enable
or disable each output clock. On power-up, all output clocks
are enabled (internal pull-up).
Note:
1. Internal 100K pull-up resistors present on inputs marked with *. Design should not rely solely on internal pull-up resistor to set I/O pins HIGH.
Block Diagram
SMBus
Decoding
&
Powerdown
Control
BUF_IN
SDATA
SCLOCK
DDR0T_SDRAM0
DDR0C_SDRAM1
DDR1T_SDRAM2
DDR1C_SDRAM3
SSOP
Top View
Pin Configuration
[1]
DDR2T_SDRAM4
DDR2C_SDRAM5
DDR3T_SDRAM6
DDR3C_SDRAM7
DDR4T_SDRAM8
PWR_DWN#
DDR4C_SDRAM9
DDR5T_SDRAM10
DDR5C_SDRAM11
FBOUT
SEL_DDR
FBOUT
*PWR_DWN#
DDR0T_SDRAM0
DDR0C_SDRAM1
VDD3.3_2.5
GND
DDR1T_SDRAM2
DDR1C_SDRAM3
VDD3.3_2.5
BUF_IN
GND
DDR2T_SDRAM4
DDR2C_SDRAM5
VDD3.3_2.5
SEL_DDR*
DDR5T_SDRAM10
DDR5C_SDRAM11
VDD3.3_2.5
GND
DDR4T_SDRAM8
DDR4C_SDRAM9
VDD3.3_2.5
GND
DDR3T_SDRAM6
DDR3C_SDRAM7
GND
SCLK
SDATA
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VDD3.5_2.5
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| CYW256OXCT | Multiconductor Paired Security UTP Cable; Number of Conductors:8; Conductor Size AWG:23; No. Strands x Strand Size:Solid; Jacket Material:Polyvinylchloride (PVC); Number of Pairs:4; Impedance:100ohm; Jacket Color:Black RoHS Compliant: Yes |
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| CYWUSB6932 | Sound/Security Multiconductor Cable; Number of Conductors:2; Conductor Size AWG:18; No. Strands x Strand Size:7 x 26; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes; Capacitance:30pF/ft RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| CYW256OXCT | 功能描述:時(shí)鐘緩沖器 SDRAM & DDR Output Buff, W256 datasheet RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:5 最大輸入頻率:40 MHz 傳播延遲（最大值）: 電源電壓-最大:3.45 V 電源電壓-最小:2.375 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LLP-24 封裝:Reel |
| CYW305OXC | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Legacy-Sys Clk Intel RSolano Chip W305B RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| CYW305OXCT | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Legacy-Sys Clk Intel RSolano Chip W305B RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| CYW311OXC | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Sys Clk VIATM Pro266 DDR Chipset W311 DS RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| CYW311OXCT | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Sys Clk VIATM Pro266 DDR Chipset W311 DS RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
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