MT41J256M8DA-125:H Micron Technology Inc, MT41J256M8DA-125:H Datasheet - Page 178

• Manufacturer Part Number: MT41J256M8DA-125:H
• Manufacturer: Micron Technology Inc

Specifications of MT41J256M8DA-125:H

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Extended Temperature Usage
Table 78: Self Refresh Temperature and Auto Self Refresh Description
Table 79: Self Refresh Mode Summary
PDF: 09005aef826aaadc
2Gb_DDR3_SDRAM.pdf – Rev. K 04/10 EN
Field
Self Refresh Temperature (SRT)
Auto Self Refresh (ASR)
MR2[6]
(ASR)
ASR
SRT
0
0
1
1
MR2[7]
MR2 Bits
(SRT)
0
1
0
1
7
6
SELF REFRESH Operation
Self refresh mode is supported in the normal temperature range Normal (0°C to +85°C)
Self refresh mode is supported in normal and extended temper-
ature ranges; When SRT is enabled, it increases self refresh
power consumption
Self refresh mode is supported in normal and extended temper-
ature ranges; Self refresh power consumption may be tempera-
ture-dependent
Illegal
Description
If ASR is disabled (MR2[6] = 0), SRT must be programmed to indicate T
*MR2[7] = 0: Normal operating temperature range (0°C to +85°C)
*MR2[7] = 1: Extended operating temperature range (0°C to +95°C)
If ASR is enabled (MR2[7] = 1), SRT must be set to 0, even if the extended temperature range is
supported
*MR2[7] = 0: SRT is disabled
When ASR is enabled, the DRAM automatically provides SELF REFRESH power management func-
tions, (refresh rate for all supported operating temperature values)
* MR2[6] = 1: ASR is enabled (M7 must = 0)
When ASR is not enabled, the SRT bit must be programmed to indicate T
operation
* MR2[6] = 0: ASR is disabled, must use manual self refresh temperature (SRT)
Micron’s DDR3 SDRAM supports the optional extended temperature range of 0°C to
+95°C, T
The extended temperature range DRAM must be refreshed externally at 2X (double re-
fresh) anytime the case temperature is above +85°C (and does not exceed +95°C). The
external refreshing requirement is accomplished by reducing the refresh period from
64ms to 32ms. However, self refresh mode requires either ASR or SRT to support the
extended temperature. Thus either ASR or SRT must be enabled when T
+85°C or self refresh cannot be used until the case temperature is at or below +85°C.
Table 78 summarizes the two extended temperature options and Table 79 summarizes
how the two extended temperature options relate to one another.
C
. Thus, the SRT and ASR options must be used at a minimum.
178
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2Gb: x4, x8, x16 DDR3 SDRAM
Extended Temperature Usage
Permitted Operating Temperature
Range for Self Refresh Mode
Normal and extended (0°C to +95°C)
Normal and extended (0°C to +95°C)
OPER
© 2006 Micron Technology, Inc. All rights reserved.
OPER
during self refresh:
during SELF REFRESH
C
is above