Datasheet
Table Of Contents
- DDR3L SDRAM
- Description
- State Diagram
- Functional Description
- Functional Block Diagrams
- Ball Assignments and Descriptions
- Package Dimensions
- Electrical Specifications
- Thermal Characteristics
- Electrical Specifications – I DD Specifications and Conditions
- Electrical Characteristics – 1.35V IDD Specifications
- Electrical Specifications – DC and AC
- ODT Characteristics
- Output Driver Impedance
- Output Characteristics and Operating Conditions
- Speed Bin Tables
- Electrical Characteristics and AC Operating Conditions
- Electrical Characteristics and AC Operating Conditions
- Command and Address Setup, Hold, and Derating
- Data Setup, Hold, and Derating
- Commands – Truth Tables
- Commands
- Input Clock Frequency Change
- Write Leveling
- Initialization
- Voltage Initialization / Change
- Mode Registers
- Mode Register 0 (MR0)
- Mode Register 1 (MR1)
- Mode Register 2 (MR2)
- Mode Register 3 (MR3)
- MODE REGISTER SET (MRS) Command
- ZQ CALIBRATION Operation
- ACTIVATE Operation
- READ Operation
- WRITE Operation
- PRECHARGE Operation
- SELF REFRESH Operation
- Extended Temperature Usage
- Power-Down Mode
- RESET Operation
- On-Die Termination (ODT)
- Dynamic ODT
- Synchronous ODT Mode
- Asynchronous ODT Mode
- Asynchronous to Synchronous ODT Mode Transition (Power-Down Exit)
Extended Temperature Usage
Alliance Memory’s DDR3 SDRAM support the optional extended case temperature (T
C
)
range of 0°C to 95°C. Thus, the SRT and ASR options must be used at a minimum.
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 ex-
ternal refresh 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
C
is above 85°C or self
refresh cannot be used until T
C
is at or below 85°C. Table 76 summarizes the two exten-
ded temperature options and Table 77 summarizes how the two extended temperature
options relate to one another.
Table 76: Self Refresh Temperature and Auto Self Refresh Description
Field MR2 Bits Description
Self Refresh Temperature (SRT)
SRT 7 If ASR is disabled (MR2[6] = 0), SRT must be programmed to indicate T
OPER
during self refresh:
*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
Auto Self Refresh (ASR)
ASR 6 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
OPER
during SELF REFRESH
operation
* MR2[6] = 0: ASR is disabled; must use manual self refresh temperature (SRT)
Table 77: Self Refresh Mode Summary
MR2[6]
(ASR)
MR2[7]
(SRT)
SELF REFRESH Operation
Permitted Operating Temperature
Range for Self Refresh Mode
0 0 Self refresh mode is supported in the normal temperature
range
Normal (0°C to 85°C)
0 1 Self refresh mode is supported in normal and extended temper-
ature ranges; When SRT is enabled, it increases self refresh
power consumption
Normal and extended (0°C to 95°C)
1 0 Self refresh mode is supported in normal and extended temper-
ature ranges; Self refresh power consumption may be tempera-
ture-dependent
Normal and extended (0°C to 95°C)
1 1 Illegal
8Gb: x4, x8, x16 DDR3L SDRAM
Extended Temperature Usage
176
Rev.2.0 June 2016
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TEL: (650) 610-6800 FAX: (650) 620-9211