- 您现在的位置：买卖IC网 > PDF目录223993 > HY5DU56422ALF-J (HYNIX SEMICONDUCTOR INC) 64M X 4 DDR DRAM, 0.7 ns, PBGA60 PDF资料下载
参数资料
| 型号： | HY5DU56422ALF-J |
| 厂商： | HYNIX SEMICONDUCTOR INC |
| 元件分类： | DRAM |
| 英文描述： | 64M X 4 DDR DRAM, 0.7 ns, PBGA60 |
| 封装： | FBGA-60 |
| 文件页数： | 9/36页 |
| 文件大小： | 395K |
| 代理商： | HY5DU56422ALF-J |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
Rev. 0.1/Apr. 02
17
HY5DU56422A(L)F
HY5DU56822A(L)F
HY5DU561622A(L)F
POWER-UP SEQUENCE AND DEVICE INITIALIZATION
DDR SDRAMs must be powered up and initialized in a predefined manner. Operational procedures other than those
specified may result in undefined operation. Except for CKE, inputs are not recognized as valid until after VREF is
applied. CKE is an SSTL_2 input, but will detect an LVCMOS LOW level after VDD is applied. Maintaining an LVCMOS
LOW level on CKE during power-up is required to guarantee that the DQ and DQS outputs will be in the High-Z state,
where they will remain until driven in normal operation (by a read access). After all power supply and reference volt-
ages are stable, and the clock is stable, the DDR SDRAM requires a 200us delay prior to applying an executable com-
mand.
Once the 200us delay has been satisfied, a DESELECT or NOP command should be applied, and CKE should be
brought HIGH. Following the NOP command, a PRECHARGE ALL command should be applied. Next a EXTENDED
MODE REGISTER SET command should be issued for the Extended Mode Register, to enable the DLL, then a MODE
REGISTER SET command should be issued for the Mode Register, to reset the DLL, and to program the operating
parameters. 200 clock cycles are required between the DLL reset and any command. During the 200 cycles of CK, for
DLL locking, executable commands are disallowed (a DESELECT or NOP command must be applied). After the 200
clock cycles, a PRECHARGE ALL command should be applied, placing the device in the all banks idle state.
Once in the idle state, two AUTO REFRESH cycles must be performed. Additionally, a MODE REGISTER SET command
for the Mode Register, with the reset DLL bit deactivated (i.e. to program operating parameters without resetting the
DLL) must be performed. Following these cycles, the DDR SDRAM is ready for normal operation.
1. Apply power - VDD, VDDQ, VTT, VREF in the following power up sequencing and attempt to maintain CKE at LVC-
MOS low state. (All the other input pins may be undefined.
No power sequencing is specified during power up or power down given the following cirteria :
VDD and VDDQ are driven from a single power converter output.
VTT is limited to 1.44V (reflecting VDDQ(max)/2 + 50mV VREF variation + 40mV VTT variation).
VREF tracks VDDQ/2.
A minimum resistance of 42 ohms (22 ohm series resistor + 22 ohm parallel resistor - 5% tolerance) limits the
input current from the VTT supply into any pin.
If the above criteria cannot be met by the system design, then the following sequencing and voltage relationship must
be adhered to during power up :
2. Start clock and maintain stable clock for a minimum of 200usec.
3. After stable power and clock, apply NOP condition and take CKE high.
4. Issue Extended Mode Register Set (EMRS) to enable DLL.
5. Issue Mode Register Set (MRS) to reset DLL and set device to idle state with bit A8=high. (An additional 200
cycles of clock are required for locking DLL)
6. Issue Precharge commands for all banks of the device.
Voltage description
Sequencing
Voltage relationship to avoid latch-up
VDDQ
After or with VDD
< VDD + 0.3V
VTT
After or with VDDQ
< VDDQ + 0.3V
VREF
After or with VDDQ
< VDDQ + 0.3V
相关PDF资料 |
PDF描述 |
|---|---|
| HY5MS5B6LF-H | 16M X 16 DDR DRAM, 6.5 ns, PBGA60 |
| HY5PS1G831ALFP-C4 | 128M X 8 DDR DRAM, PBGA68 |
| HY5PS1G831ALFP-Y5 | 128M X 8 DDR DRAM, PBGA68 |
| HY5RS573225AFP-16L | 8M X 32 DDR DRAM, 0.28 ns, PBGA136 |
| HY5V28CF-S | 16M X 8 SYNCHRONOUS DRAM, 6 ns, PBGA54 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| HY5DU56422ALT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:64Mx4|2.5V|8K|J/M/K/H/L|DDR SDRAM - 256M |
| HY5DU56422ALT-H | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:256M-S DDR SDRAM |
| HY5DU56422ALT-J | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:256M-S DDR SDRAM |
| HY5DU56422ALT-K | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:256M-S DDR SDRAM |
| HY5DU56422ALT-L | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:256M-S DDR SDRAM |
发布紧急采购，3分钟左右您将得到回复。