參數(shù)資料
型號(hào): HM5425801BTT-75B
廠商: ELPIDA MEMORY INC
元件分類: DRAM
英文描述: 256M SSTL_2 interface DDR SDRAM 143 MHz/133 MHz/125 MHz/100 MHz 4-Mword 】 16-bit 】 4-bank/8-Mword 】 8-bit 】 4-bank/ 16-Mword 】 4-bit 】 4-bank
中文描述: 32M X 8 DDR DRAM, 0.75 ns, PDSO66
封裝: 0.400 INCH, PLASTIC, TSOP2-66
文件頁數(shù): 21/65頁
文件大?。?/td> 489K
代理商: HM5425801BTT-75B
HM5425161B, HM5425801B, HM5425401B Series
Data Sheet E0086H20
21
Operation of the DDR SDRAM
Power-up Sequence
The following sequence is recommended for Power-up.
(1) Apply power and attempt to maintain CKE at an LVCMOS low state (all other inputs may be undefined).
Apply V
CC
before or at the same time as V
CCQ
.
Apply V
CCQ
before or at the same time as V
TT
and V
REF
.
(2) Start clock and maintain stable condition for a minimum of 200 μs.
(3) After the minimum 200 μs of stable power and clock (CLK,
CLK
), apply NOP and take CKE high.
(4) Issue precharge all command for the device.
(5) Issue EMRS to enable DLL.
(6) Issue a mode register set command (MRS) for "DLL reset" with bit A8 set to high (An additional 200
cycles of clock input is required to lock the DLL after every DLL reset).
(7) Issue precharge all command for the device.*
1
(8) Issue 2 or more auto-refresh commands.*
1
(9) Issue a mode register set command to initialize device operation with bit A8 set to low in order to avoid
resetting the DLL.
Note: 1. Sequence of (7) and (8) may be reversed.
Power-up Sequence after CKE Goes High
Command
EMRS
PALL
MRS
REF
2 cycles (min)
2 cycles (min)
200 cycles (min)
2 cycles (min)
2 cycles (min)
t
RP
t
RC
t
RC
PALL
MRS
REF
coAny
DLL enable
DLL reset
with A8 = High
Disable DLL reset
with A8 = Low
(4)
(5)
(6)
(7)
(8)
(9)
相關(guān)PDF資料
PDF描述
HM5425401BTT-75B 256M SSTL_2 interface DDR SDRAM 143 MHz/133 MHz/125 MHz/100 MHz 4-Mword 】 16-bit 】 4-bank/8-Mword 】 8-bit 】 4-bank/ 16-Mword 】 4-bit 】 4-bank
HM5425161B 256M SSTL_2 interface DDR SDRAM(256M SSTL_2接口 DDR 同步DRAM)
HM5425401B 256M SSTL_2 interface DDR SDRAM(256M SSTL_2接口 DDR 同步DRAM)
HM5425801B 256M SSTL_2 interface DDR SDRAM(256M SSTL_2接口 DDR 同步DRAM)
HM6116LP-2 2048-word X 8bit High Speed CMOS Static RAM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HM5444R42HLF 制造商:BITECH 制造商全稱:Bi technologies 功能描述:High Current Toroidal Inductors
HM54-44R42HLF 功能描述:HIGH CURRENT TOROIDAL INDUCTORS RoHS:是 類別:電感器,線圈,扼流圈 >> 固定式 系列:HM54 標(biāo)準(zhǔn)包裝:500 系列:1331 電感:1.2µH 電流:247mA 電流 - 飽和:247mA 電流 - 溫升:- 類型:鐵芯體 容差:±10% 屏蔽:屏蔽 DC 電阻(DCR):最大 730 毫歐 Q因子@頻率:40 @ 7.9MHz 頻率 - 自諧振:130MHz 材料 - 芯體:鐵 封裝/外殼:0.312" L x 0.115" W x 0.135" H(7.94mm x 2.92mm x 3.43mm) 安裝類型:表面貼裝 包裝:帶卷 (TR) 工作溫度:-55°C ~ 105°C 頻率 - 測試:7.9MHz
HM5444R42VLF 制造商:BITECH 制造商全稱:Bi technologies 功能描述:High Current Toroidal Inductors
HM54-44R42VLF 功能描述:HIGH CURRENT TOROIDAL INDUCTORS RoHS:是 類別:電感器,線圈,扼流圈 >> 固定式 系列:HM54 標(biāo)準(zhǔn)包裝:500 系列:1331 電感:1.2µH 電流:247mA 電流 - 飽和:247mA 電流 - 溫升:- 類型:鐵芯體 容差:±10% 屏蔽:屏蔽 DC 電阻(DCR):最大 730 毫歐 Q因子@頻率:40 @ 7.9MHz 頻率 - 自諧振:130MHz 材料 - 芯體:鐵 封裝/外殼:0.312" L x 0.115" W x 0.135" H(7.94mm x 2.92mm x 3.43mm) 安裝類型:表面貼裝 包裝:帶卷 (TR) 工作溫度:-55°C ~ 105°C 頻率 - 測試:7.9MHz
HM54-45R41HLF 功能描述:HIGH CURRENT TOROIDAL INDUCTORS RoHS:是 類別:電感器,線圈,扼流圈 >> 固定式 系列:HM54 標(biāo)準(zhǔn)包裝:500 系列:1331 電感:1.2µH 電流:247mA 電流 - 飽和:247mA 電流 - 溫升:- 類型:鐵芯體 容差:±10% 屏蔽:屏蔽 DC 電阻(DCR):最大 730 毫歐 Q因子@頻率:40 @ 7.9MHz 頻率 - 自諧振:130MHz 材料 - 芯體:鐵 封裝/外殼:0.312" L x 0.115" W x 0.135" H(7.94mm x 2.92mm x 3.43mm) 安裝類型:表面貼裝 包裝:帶卷 (TR) 工作溫度:-55°C ~ 105°C 頻率 - 測試:7.9MHz