Description
These Hitachi MultiMediaCard™s, HB28E016MM2, HB28D032MM2, HB28D064MM2 and HB28B128MM2, are highly integrated flash memories with serial and random access capability.  It is accessible via a dedicated serial interface optimized for fast and reliable data transmission.  This interface allows several cards to be stacked by through connecting their peripheral contacts.  These Hitachi MultiMediaCards are fully compatible to a new consumer standard, called the MultiMediaCard system standard defined in the MultiMediaCard system specification [1]. 

Features
• 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte memory capacity
• On card error correction
• MultiMediaCard system standard compatibility
    - System specification version 3.1 compliant
    - SPI mode supports the single and multiple block read and write operations.
    - Block and partial block read supported (Command classes 2)
    - Stream read supported (Command class 1)
    - Block write and erase supported (Command classes 4 and 5)
    - Group write protection (Command classes 6)
    - Stream write supported (Command classes 3)
    - Password data access protection
    - Small erase block size of 512 bytes, tagged erase supported
    - Read block size programmable between 1 and 2048 bytes
    - VCC = 2.7 V to 3.6 V operation voltage range (VCC = 2.0 V to 3.6 V for the interface)
    - No external programming voltage required
    - Damage free powered card insertion and removal (no operation)
    - 4kV ESD protection (Contact Pads)
• High speed serial interface with random access
    - Read speed: sustained:  13.7 Mbit/s (multi-block read) burst (one block):  20 Mbit/s
    - Write speed: sustained: 6.4 Mbit/s (for HB28E016MM2/HB28D032MM2) (multi-block write) 12.8 Mbit/s (for HB28D064MM2/HB28B128MM2) (multi-block write) burst (one block):  20 Mbit/s
    - Up to 10 stacked card (at 20 MHz, VCC = 2.7 to 3.6V)
    - Access time:  300 µs (typ) (at 20 MHz, VCC = 2.7 to 3.6V)
• Low power dissipation
    - High speed:  216 mW (max) (at 20 MHz, VCC = 3.6 V):  HB28E016MM2/HB28D032MM2
    - High speed:  288 mW (max) (at 20 MHz, VCC = 3.6 V):  HB28D064MM2/HB28B128MM2