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參數(shù)資料
| 型號： | CY2276A-21 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 3SO- DIMMs(帶英特爾82440LX 和3SO-DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
| 中文描述： | PentiumII時鐘合成器/桌面電腦與英特爾82440LX和3SO - DIMM內(nèi)存（帶英特爾82440LX和3SO - DIMM內(nèi)存的應(yīng)用于桌上型電腦機的奔騰二時鐘合成器/驅(qū)動器驅(qū)動程序） |
| 文件頁數(shù)： | 1/13頁 |
| 文件大?。?/td> | 205K |
| 代理商： | CY2276A-21 |
Pentium
/II Clock Synthesizer/Driver for Desktop PCs
with Intel 82440LX and 3–4 DIMMs
outputs available from each device, as shown in the Selector
Guide.
The CY2276A-21 is ideal for four-SDRAM module or server
applications that require sixteen SDRAM clocks, and do not
require the ability to stop CPU clocks. The CY2276A-31 is ide-
al for single-processor or dual-processor desktop systems,
which require an extra CPU clock.
All CY2276A outputs are designed for low EMI emissions.
Controlled rise and fall times, unique output driver circuits and
factory-EPROM programmable output drive and slew-rate en-
able optimal configurations for EMI control.
CY2276A-21
CY2276A-31
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
October 12, 1998
Features
Mixed 2.5V and 3.3V operation
Single-chip clock solution to meet requirements of Pen-
tium and Pentium II motherboards
—Multiple CPU clocks at 2.5V supporting single and
dual-processor systems
—Seven synchronous PCI clocks
—Multiple 2.5V IOAPIC clocks at 14.318 MHz
—Multiple 3.3V SDRAM clocks
—Multiple 3.3V USB and I/O clocks
—Multiple 3.3V Ref. clocks at 14.318 MHz
I
2
C Serial Configuration Interface
Factory-EPROM programmable output drive and slew
rate for EMI customization
Factory-EPROM programmable clock frequencies for
custom configurations
High drive, low skew, and low jitter outputs
Available in space-saving 56-pin SSOP package
Functional Description
The CY2276A-21 andCY2276A-31 are single-chip clock gen-
erators for Pentium or Pentium II systems designed with the
Intel 82440LX or similar chipset. They differ in the number of
CY2276A Selector Guide.
Clock Outputs
CPU (60, 66.6 MHz)
SDRAM
PCI (CPU/2 MHz)
IOAPIC (14.318 MHz)
USB/IO (48 MHz)
IO (24 MHz)
Ref. (14.318 MHz)
CPU-PCI delay
-21
4
16
7
2
1
1
1
-31
5
13
7
2
2
0
2
1–6 ns
1–5 ns
Intel and Pentium are registered trademarks of Intel Corporation.
I
2
C is a trademark of Philips Corporation.
Logic Block Diagram
EPROM
XTALOUT
XTALIN
IOAPIC (14.318 MHz)
14.318
MHz
OSC.
SDRAM
SEL
V
DDQ2
REF (14.318 MHz)
CPU
PLL
/2
SCLK
SDATA
CPUCLK
V
DDCPU
PCI [0–6]
INTERFACE
CONTROL
LOGIC
SERIAL
EPROM
Prog.
Delay
SYS
PLL
USBCLK (48 MHz)
IOCLK (24 MHz)
/2
Please refer to Selector Guide for exact number of outputs on each device
OE
Available on -31 only
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY2276A-31 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 3SO- DIMMs(帶英特爾82440LX 和3SO-DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
| CY2278A | PentiumII Clock Synthesizer/Driver for Mobile PCs with Intel 82430TX and No SDRAM(帶英特爾82430TX和2個DIMM 或3個SO-DIMM 的應(yīng)用于移動PC機的奔騰II6x86, K6 時鐘合成器/驅(qū)動器) |
| CY22800-082A | Universal Programmable Clock Generator (UPCG) |
| CY22800 | Universal Programmable Clock Generator (UPCG) |
| CY22800_07 | Universal Programmable Clock Generator (UPCG) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY2276APVC-13 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2276PVC-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2276PVC-2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2276PVC-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2276PVC-4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
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