參數(shù)資料
型號(hào)： CY7C1522JV18-250BZI
廠商： CYPRESS SEMICONDUCTOR CORP
元件分類(lèi)： SRAM
英文描述： 8M X 8 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)： 27/27頁(yè)
文件大?。?/td> 658K
代理商： CY7C1522JV18-250BZI
CY7C1522JV18, CY7C1529JV18
CY7C1523JV18, CY7C1524JV18
Document #: 001-44700 Rev. *B
Page 9 of 27
Echo Clocks
Echo clocks are provided on the DDR-II to simplify data capture
on high-speed systems. Two echo clocks are generated by the
DDR-II. CQ is referenced with respect to C and CQ is referenced
with respect to C. These are free running clocks and are synchro-
nized to the output clock of the DDR-II. In the single clock mode,
CQ is generated with respect to K and CQ is generated with
respect to K. The timing for the echo clocks is shown in Switching
DLL
These chips use a Delay Lock Loop (DLL) that is designed to
function between 120 MHz and the specified maximum clock
frequency. During power up, when the DOFF is tied HIGH, the
DLL is locked after 1024 cycles of stable clock. The DLL is also
reset by slowing or stopping the input clocks K and K for a
minimum of 30 ns. However, it is not necessary to reset the DLL
to lock it to the desired frequency. The DLL automatically locks
1024 clock cycles after a stable clock is presented. Disable the
DLL by applying ground to the DOFF pin. When the DLL is turned
off, the device behaves in DDR-I mode (with one cycle latency
and a longer access time). For information refer to the application
note
Considerations
in
QDRII/DDRII/QDRII+/DDRII+’.
Application Example
Figure 1 shows four DDR-II SIO used in an application.
Figure 1. Application Example
LD
#
R/W
#
B
W
#
Vt = VREF
CC#
CQ
CQ#
K#
ZQ
Q
D
K
CC# K
BUS
MASTER
(CPU
or
ASIC)
SRAM 1
SRAM 4
DATA IN
DATA OUT
Address
LD#
R/W#
BWS#
SRAM 1 Input CQ
SRAM 1 Input CQ#
SRAM 4 Input CQ
SRAM 4 Input CQ#
Source K
Source K#
Delayed K
Delayed K#
R=50Ohms
R = 250Ohms
CQ
CQ#
K#
ZQ
Q
LD
#
R/W
#
B
W
S
#
LD
#
R/W
#
Vt
R
A
D
R = 250Ohms
B
W
S
#
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相關(guān)代理商/技術(shù)參數(shù)
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CY7C1523KV18-250BZ 制造商:Cypress Semiconductor 功能描述:
CY7C1523KV18-250BZXC 功能描述:靜態(tài)隨機(jī)存取存儲(chǔ)器 72MB (4Mx18) 1.8v 250MHz DDR II 靜態(tài)隨機(jī)存取存儲(chǔ)器 RoHS:否 制造商:Cypress Semiconductor 存儲(chǔ)容量:16 Mbit 組織:1 M x 16 訪問(wèn)時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSOP-48 封裝:Tray
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