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參數(shù)資料
| 型號： | CY7C1524AV18 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 72-Mbit DDR-II SIO SRAM 2-Word Burst Architecture |
| 中文描述： | 72兆位的DDR - II二氧化硅的SRAM 2字突發(fā)結構 |
| 文件頁數(shù)： | 19/28頁 |
| 文件大小： | 1133K |
| 代理商： | CY7C1524AV18 |
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PRELIMINARY
CY7C1522AV18
CY7C1529AV18
CY7C1523AV18
CY7C1524AV18
Document #: 001-06981 Rev. *B
Page 19 of 28
Power-Up Sequence in DDR-II SRAM
[14]
DDR-II SRAMs must be powered up and initialized in a
predefined manner to prevent undefined operations.
Power-Up Sequence
Apply power with DOFF tied HIGH (All other inputs can be
HIGH or LOW)
— Apply V
DD
before V
DDQ
— Apply V
DDQ
before V
REF
or at the same time as V
REF
Provide stable power and clock (K, K) for 1024 cycles to
lock the DLL.
DLL Constraints
DLL uses K clock as its synchronizing input. The input
should have low phase jitter, which is specified as t
KC Var
.
The DLL will function at frequencies down to 80 MHz.
If the input clock is unstable and the DLL is enabled, then
the DLL may lock onto an incorrect frequency, causing
unstable SRAM behavior. To avoid this, provide 1024 cycles
stable clock to relock to the desired clock frequency.
Power-Up Waveforms
Note:
14.During Power-Up, when the DOFF is tied HIGH, the DLL gets locked after 1024 cycles of stable clock.
> 1024 Stable clock
Start Normal
Operation
DOFF
Stabl
e
(< +/- 0.1V DC per 50ns )
Fix High (or tied to VDDQ)
K
K
DDQ
V
DD
V
/
DDQ
DD
V
V
/
Clock Start
(
Clock Starts after DD
)
V
/
~
~
~
~
Unstable Clock
[+] Feedback
相關PDF資料 |
PDF描述 |
|---|---|
| CY7C1524AV18-167BZC | 72-Mbit DDR-II SIO SRAM 2-Word Burst Architecture |
| CY7C1524AV18-167BZI | 72-Mbit DDR-II SIO SRAM 2-Word Burst Architecture |
| CY7C1524AV18-167BZXC | 72-Mbit DDR-II SIO SRAM 2-Word Burst Architecture |
| CY7C1524AV18-167BZXI | 72-Mbit DDR-II SIO SRAM 2-Word Burst Architecture |
| CY7C1524AV18-200BZC | 72-Mbit DDR-II SIO SRAM 2-Word Burst Architecture |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CY7C1525JV18250BZC | 制造商:Cypress Semiconductor 功能描述: |
| CY7C1525JV18-250BZC | 功能描述:靜態(tài)隨機存取存儲器 8M x 9 1.8V QDR-II 靜態(tài)隨機存取存儲器 Two-Word Burst RoHS:否 制造商:Cypress Semiconductor 存儲容量:16 Mbit 組織:1 M x 16 訪問時間:55 ns 電源電壓-最大:3.6 V 電源電壓-最小:2.2 V 最大工作電流:22 uA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:TSOP-48 封裝:Tray |
| CY7C1525JV18-250BZCES | 制造商:Rochester Electronics LLC 功能描述: 制造商:Cypress Semiconductor 功能描述: |
| CY7C1525JV18-250BZXC | 功能描述:靜態(tài)隨機存取存儲器 8M x 9 1.8V QDR-II 靜態(tài)隨機存取存儲器 Two-Word Burst RoHS:否 制造商:Cypress Semiconductor 存儲容量:16 Mbit 組織:1 M x 16 訪問時間:55 ns 電源電壓-最大:3.6 V 電源電壓-最小:2.2 V 最大工作電流:22 uA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:TSOP-48 封裝:Tray |
| CY7C1525KV18-250BZC | 功能描述:靜態(tài)隨機存取存儲器 72MB (8Mx9) 1.8v 250MHz QDR II 靜態(tài)隨機存取存儲器 RoHS:否 制造商:Cypress Semiconductor 存儲容量:16 Mbit 組織:1 M x 16 訪問時間:55 ns 電源電壓-最大:3.6 V 電源電壓-最小:2.2 V 最大工作電流:22 uA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:TSOP-48 封裝:Tray |
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