The H7A2EG21C1CX (256G-bit) NAND Flash devices include an asynchronous data interface for high-performance I/O operations. These devices use a highly multiplexed 8-bit bus (DQx) to transfer commands, address, and data. There are five control signals used to implement the asynchronous data interface: CE#, CLE, ALE, WE#, and RE#. Additional signals control hardware write protection (WP#) and monitor device status (R/B#).

The H7A2EG21C1CX (256G-bit) NAND Flash device additionally includes a synchronous data interface for high-performance I/O operations. When the synchronous interface is active, WE# becomes CLK and RE# becomes W/R#. Data transfers include a bidirectional data strobe (DQS).

This hardware interface creates a low pin-count device with a standard pinout that remains the same from one density to another, enabling future upgrades to higher densities with no board redesign.

A target is the unit of memory accessed by a chip enable signal. A target contains one or more NAND Flash die. A NAND Flash die is the minimum unit that can independently execute commands and report status. A NAND Flash die, in the ONFI specification, is referred to as a logical unit (LUN).
  • Open NAND Flash Interface (ONFI) 2.3-compliant1
  • Multiple-level cell (MLC) technology
  • Organization
    – Page size: 8936 bytes (8192 + 744 bytes)
    – Block size: 256 pages (2048K + 186K bytes)
    – Plane size: 2 planes x 1064 blocks per plane
    – Device size: 256Gib =17024 blocks
  • Synchronous I/O performance4:
    – Up to synchronous timing mode 43
    – Clock rate: 10ns (DDR)
    – Read/write throughput per pin: 166MT/s
  • Asynchronous I/O performance:
    – Up to asynchronous timing mode 5
    – tRC/tWC: 20ns (MIN)
    – Read/write throughout per pin: 50MT/s
  • Array performance
    – Read Page: 130μs (MAX)
    – Program Page: 3200μs (MAX)
    – Erase Block: 15ms (MAX)
  • Operating voltage range
    – VCC: 2.7–3.6V
    – VCCQ: 2.7V-3.6V
  • Command set: ONFI NAND Flash Protocol•
  • Advanced Command Set
    – Program cache
    – Read cache sequential
    – Read cache random
    – One-time programmable (OTP) mode
    – Multi-plane commands
    – Multi-LUN operations
    – Copyback
  • Operating temperature:
    – Commercial: +10°C to +70°C
  • Package: 48-pin TSOP
  • RESET (FFh) required as first command after Power-on