Features of 256Mb DDR SDRAM products, including VDD, VDDQ, Bidirectional data strobe (DQS) etc.
The MT46V64M4, MT46V32M8, and MT46V16M16 are 256‑Mb DDR SDRAM families offered by Micron. They are available in x4, x8, and x16 data‑width configurations and support a range of speed grades and package types for commercial, industrial, and automotive applications.
Key features include four internal banks, programmable burst lengths, auto‑refresh, and power‑down modes. The devices operate from a differential clock, provide bidirectional data strobes, and meet JEDEC SSTL_2 standards. Detailed timing tables, command definitions, and block diagrams are included to aid system designers.
| Capacity per configuration | 64 Mb (x4), 32 Mb (x8), 16 Mb (x16) |
|---|---|
| Package types | 66‑pin TSOP (Pb‑free), 60‑ball FBGA (8 mm × 14 mm), 60‑ball FBGA (8 mm × 12.5 mm) |
| Speed grades | -5B (133 MHz, CL=2), -6 (133 MHz, CL=2.5), -6T (133 MHz, CL=2.5) |
| Internal banks | Four internal banks |
The MT46V64M4 supports speed grades -5B (133 MHz, CL = 2), -6 (133 MHz, CL = 2.5), -6T (133 MHz, CL = 2.5), -75E, -75Z, and -75.
They are available in 66‑pin TSOP (Pb‑free) and 60‑ball FBGA packages (8 mm × 14 mm or 8 mm × 12.5 mm).
The DDR SDRAM is internally configured with four banks.