- 您现在的位置：买卖IC网 > Sheet目录345 > MT42L256M32D4KP-3 IT:A (Micron Technology Inc)IC LPDDR2 SDRAM 8GBIT 168FBGA
2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
Mode Register Definition
Tx is the point where any power supply drops below the minimum value specified in
the Recommended DC Operating Conditions table.
Tz is the point where all power supplies are below 300mV. After Tz, the device is pow-
ered off.
Required Power Supply Conditions Between Tx and Tz:
?
?
?
?
V DD1 must be greater than V DD2 - 200mV
V DD1 must be greater than V DDCA - 200mV
V DD1 must be greater than V DDQ - 200mV
V REF must always be less than all other supply voltages
The voltage difference between V SS , V SSQ , and V SSCA must not exceed 100mV.
For supply and reference voltage operating conditions, see Recommended DC Operat-
ing Conditions table.
Uncontrolled Power-Off
When an uncontrolled power-off occurs, the following conditions must be met:
? At Tx, when the power supply drops below the minimum values specified in the Rec-
ommended DC Operating Conditions table, all power supplies must be turned off and
all power-supply current capacity must be at zero, except for any static charge re-
maining in the system.
? After Tz (the point at which all power supplies first reach 300mV), the device must
power off. The time between Tx and Tz must not exceed t POFF. During this period, the
relative voltage between power supplies is uncontrolled. V DD1 and V DD2 must de-
crease with a slope lower than 0.5 V/μs between Tx and Tz.
An uncontrolled power-off sequence can occur a maximum of 400 times over the life of
the device.
Table 9: Power-Off Timing
Parameter
Maximum power-off ramp time
Symbol
t POFF
Min
–
Max
2
Unit
sec
Mode Register Definition
LPDDR2 devices contain a set of mode registers used for programming device operating
parameters, reading device information and status, and for initiating special operations
such as DQ calibration, ZQ calibration, and device reset.
Mode Register Assignments and Definitions
The MRR command is used to read from a register. The MRW command is used to write
to a register. An “R” in the access column of the mode register assignment table indi-
cates read-only; a “W” indicates write-only; “R/W” indicates read or write capable or
enabled.
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
43
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
MT45W1MW16BDGB-708 AT
IC PSRAM 16MBIT 104MHZ 54VFBGA
MT48H32M16LFB4-75B IT:C
IC SDRAM 512MB 54VFBGA
MT48H8M16LFB4-75 IT:K TR
IC SDRAM 128MBIT 133MHZ 54VFBGA
MTC100-JA2-P34
CONTACT INSERT PIN
MX841BE
IC CONVERTER WHITE LED 8-SOIC
MXHV9910BTR
IC LED DRIVER HIGH BRIGHT 8-SOIC
MXN12FB12F
MOTOR BRUSHED DC 12V 2922RPM
MXN13FB08B1
MOTOR BRUSHED DC 8V 4714RPM
相关代理商/技术参数
MT42L256M32D4KP-MS
制造商:Micron Technology Inc 功能描述:256MX32 LPDDR2 PLASTIC IND TEMP GREEN WFBGA 1.2V - Bulk