參數(shù)資料
型號: CY7C1418BV18-278BZI
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類: DRAM
英文描述: 36-Mbit DDR-II SRAM 2-Word Burst Architecture
中文描述: 2M X 18 DDR SRAM, 0.45 ns, PBGA165
封裝: 15 X 17 MM, 1.40 MM HEIGHT, MO-216, FBGA-165
文件頁數(shù): 19/28頁
文件大?。?/td> 1132K
代理商: CY7C1418BV18-278BZI
PRELIMINARY
CY7C1416BV18
CY7C1427BV18
CY7C1418BV18
CY7C1420BV18
Document Number: 001-07033 Rev. *B
Page 19 of 28
Power-Up Sequence in DDR-II SRAM
[13]
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:
13.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
CY7C1418BV18-278BZXC 36-Mbit DDR-II SRAM 2-Word Burst Architecture
CY7C1418BV18-278BZXI 36-Mbit DDR-II SRAM 2-Word Burst Architecture
CY7C1418BV18-300BZC 36-Mbit DDR-II SRAM 2-Word Burst Architecture
CY7C1418BV18-300BZI 36-Mbit DDR-II SRAM 2-Word Burst Architecture
CY7C1418BV18-300BZXC 36-Mbit DDR-II SRAM 2-Word Burst Architecture
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