參數(shù)資料
型號(hào)： CY7C1518V18-250BZC
廠商： CYPRESS SEMICONDUCTOR CORP
元件分類(lèi)： DRAM
英文描述： 72-Mbit DDR-II SRAM 2-Word Burst Architecture
中文描述： 4M X 18 DDR SRAM, 0.45 ns, PBGA165
封裝： 15 X 17 MM, 1.40 MM HEIGHT, MO-216, FBGA-165
文件頁(yè)數(shù)： 19/28頁(yè)
文件大小： 457K
代理商： CY7C1518V18-250BZC
CY7C1516V18
CY7C1527V18
CY7C1518V18
CY7C1520V18
Document #: 38-05563 Rev. *D
Page 19 of 28
Power-Up Sequence in DDR-II SRAM
[14, 15]
DDR-II SRAMs must be powered up and initialized in a
predefined manner to prevent undefined operations.
Power-Up Sequence
Apply power and drive DOFF LOW (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
After the power and clock (K, K, C, C) are stable take DOFF
HIGH
The additional 1024 cycles of clocks are required for the
DLL to lock.
Power-up Waveforms
DLL Constraints
DLL uses either K or C 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 to an incorrect frequency, causing
unstable SRAM behavior
.
Notes:
14.It is recommended that the DOFF pin be pulled HIGH via a pull up resistor of 1 Kohm.
15.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(guān)PDF資料
PDF描述
CY7C1518V18-250BZI 72-Mbit DDR-II SRAM 2-Word Burst Architecture
CY7C1518V18-250BZXC 72-Mbit DDR-II SRAM 2-Word Burst Architecture
CY7C1518V18-250BZXI 72-Mbit DDR-II SRAM 2-Word Burst Architecture
CY7C1518V18-278BZC 72-Mbit DDR-II SRAM 2-Word Burst Architecture
CY7C1518V18-278BZI 72-Mbit DDR-II SRAM 2-Word Burst Architecture
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CY7C1518V18-250BZCES 制造商:Cypress Semiconductor 功能描述:4MX18 72M DDR-II BURST 2 SRAM - Bulk
CY7C1518V18-278BZCES 制造商:Cypress Semiconductor 功能描述:
CY7C1518XC 制造商:Cypress Semiconductor 功能描述:
CY7C1518YC 制造商:Cypress Semiconductor 功能描述:
CY7C1518ZC 制造商:Cypress Semiconductor 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*