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IS43LD16640C bảng dữ liệu(PDF) 61 Page - Integrated Silicon Solution, Inc

tên linh kiện IS43LD16640C
Giải thích chi tiết về linh kiện  1Gb (x16, x32) Mobile LPDDR2 S4 SDRAM
PDF  142 Pages
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nhà sản xuất  ISSI [Integrated Silicon Solution, Inc]
Trang chủ  http://www.issi.com
Logo ISSI - Integrated Silicon Solution, Inc

IS43LD16640C bảng dữ liệu(HTML) 61 Page - Integrated Silicon Solution, Inc

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IS43/46LD16640C
IS43/46LD32320C
Integrated Silicon Solution, Inc. — www.issi.com
61
Rev. C
07/02/2021
® Long-term Support
World Class Quality
Recommended Self Refresh Entry and Exit
REFRESH Requirements
1. Minimum Number of REFRESH Commands
Mobile LPDDR2 requires a minimum number, R, of REFRESH (REFab) commands within any roll-
ing refresh window (tREFW = 32 ms @ MR4[2:0] = 011 or TC
≤ 85˚C). For actual values per den-
sity and the resulting average refresh interval (tREFI).
For tREFW and tREFI refresh multipliers at different MR4 settings, see the MR4 Device Tempera-
ture (MA[7:0] = 04h) table.
For devices supporting per-bank REFRESH, a REFab command can be replaced by a full cycle of
eight REFpb commands.
2. Burst REFRESH Limitation
To limit current consumption, a maximum of eight REFab commands can be issued in any roll-
ing tREFBW (tREFBW = 4 × 8 × tRFCab). This condition does not apply if REFpb commands are
used.
3. REFRESH Requirements and Self Refresh
If any time within a refresh window is spent in self refresh mode, the number of required REFRESH
commands in that window is reduced to the following:
R’ = RU〔tSRF / tREFI〔= R - RU ×〔R x tSRF / tREFW〔
Where RU represents the round-up function.
Note: In conjunction with a burst/pause refresh pattern



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