MT46H8M32LFB5-6 IT:H Micron Technology Inc, MT46H8M32LFB5-6 IT:H Datasheet - Page 39

• Manufacturer Part Number: MT46H8M32LFB5-6 IT:H
• Description: DRAM Chip DDR SDRAM 256M-Bit 8Mx32 1.8V 90-Pin VFBGA Tray
• Manufacturer: Micron Technology Inc
• Type: DDR SDRAMr

Specifications of MT46H8M32LFB5-6 IT:H

• Density: 256 Mb
• Maximum Clock Rate: 166 MHz
• Package: 90VFBGA
• Address Bus Width: 14 Bit
• Operating Supply Voltage: 1.8 V
• Maximum Random Access Time: 6.5|5 ns
• Operating Temperature: -40 to 85 °C
• Organization: 8Mx32
• Address Bus: 14b
• Access Time (max): 6.5/5ns
• Operating Supply Voltage (typ): 1.8V
• Package Type: VFBGA
• Operating Temp Range: -40C to 85C
• Operating Supply Voltage (max): 1.95V
• Operating Supply Voltage (min): 1.7V
• Supply Current: 120mA
• Pin Count: 90
• Mounting: Surface Mount
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Compliant

SELF REFRESH
DEEP POWER-DOWN
Figure 13: DEEP POWER-DOWN Command
PDF: 09005aef834bf85b
256mb_mobile_ddr_sdram_t36n.pdf - Rev. H 11/09 EN
The SELF REFRESH command is used to place the device in self refresh mode; self re-
fresh mode is used to retain data in the memory device while the rest of the system is
powered down. When in self refresh mode, the device retains data without external clock-
ing. The SELF REFRESH command is initiated like an AUTO REFRESH command,
except that CKE is disabled (LOW). After the SELF REFRESH command is registered, all
inputs to the device become “Don’t Care” with the exception of CKE, which must re-
main LOW.
Micron recommends that, prior to self refresh entry and immediately upon self refresh
exit, the user perform a burst auto refresh cycle for the number of refresh rows. Alterna-
tively, if a distributed refresh pattern is used, this pattern should be immediately
resumed upon self refresh exit.
The DEEP POWER-DOWN (DPD) command is used to enter DPD mode, which ach-
ieves maximum power reduction by eliminating the power to the memory array. Data
will not be retained when the device enters DPD mode. The DPD command is the same
as a BURST TERMINATE command with CKE LOW.
BA0, BA1
Address
RAS#
CAS#
WE#
CK#
CKE
CS#
CK
Don’t Care
39
256Mb: x16, x32 Mobile LPDDR SDRAM
Micron Technology, Inc. reserves the right to change products or specifications without notice.
©2008 Micron Technology, Inc. All rights reserved.
Commands