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| MT40A512M8RH-083E Datasheet, PDF (143/365 Pages) Micron Technology – Programmable data strobe preambles | |||
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4Gb: x4, x8, x16 DDR4 SDRAM
Temperature-Controlled Refresh Mode
Table 48: Normal tREFI Refresh (TCR Enabled)
Temperature
TC < 45°C
45°C ⤠TC < 85°C
85°C ⤠TC < 95°C
Normal Temperature Range
External Refresh
Period
Internal Refresh
Period
7.8μs
> 7.8μs
7.8μs
7.8μs
N/A
Extended Temperature Range
External Refresh
Period
Internal Refresh
Period
>>3.9μs
3.9μs1
>3.9μs
3.9μs
Note: 1. If the external refresh period is slower than 3.9μs, the device will refresh internally at
too slow of a refresh rate and will violate refresh specifications.
Figure 83: TCR Mode Example1
Controller
External
tREFI
<3.9μs
REFRESH
REFRESH
REFRESH
95°C to 85°C
Internal
tREFI
3.9μs
REFRESH
REFRESH
85°C to 45°C
REFRESH
Internal
tREFI
>3.9μs
REFRESH
REFRESH
Below 45°C
REFRESH
Internal
tREFI
>>3.9μs
REFRESH
REFRESH
REFRESH
REFRESH
REFRESH
REFRESH
REFRESH
REFRESH
REFRESH
REFRESH
REFRESH
REFRESH
Controller issues REFRESH
commands at extended
temperature rate
External REFRESH
commands are not
ignored
Every other
external REFRESH
ignored
At low temperature,
more REFRESH commands
can be ignored
Note: 1. TCR enabled with extended temperature range selected.
09005aef84af6dd0
4gb_ddr4_dram.pdf - Rev. G 1/17 EN
143
Micron Technology, Inc. reserves the right to change products or specifications without notice.
 2014 Micron Technology, Inc. All rights reserved.
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