GENERAL DESCRIPTION
The MT28C6428P20 and MT28C6428P18 combination Flash and SRAM memory devices provide a compact, low-power solution for systems where PCB real estate is at a premium. The dual-bank Flash devices are high-performance, high-density, nonvolatile memory with a revolutionary architecture that can significantly improve system performance.

FEATURES
• Flexible dual-bank architecture
• Support for true concurrent operations with no latency:
    Read bank b during program bank a and vice versa
    Read bank b during erase bank a and vice versa
• Organization: 4,096K x 16 (Flash)
                         512K x 16 (SRAM)
• Basic configuration:
    Flash
    Bank a (16Mb Flash for data storage)
    – Eight 4K-word parameter blocks
    – Thirty-one 32K-word blocks
    Bank b (48Mb Flash for program storage)
    – Ninety-six 32K-word main blocks
    SRAM
    8Mb SRAM for data storage
    – 512K-words
• F_VCC, VCCQ, F_VPP, S_VCC voltages
    MT28C6428P20
        1.80V (MIN)/2.20V (MAX) F_VCC read voltage
        1.80V (MIN)/2.20V (MAX) S_VCC read voltage
        1.80V (MIN)/2.20V (MAX) VCCQ
    MT28C6428P18
        1.70V (MIN)/1.90V (MAX) F_VCC read voltage
        1.70V (MIN)/1.90V (MAX) S_VCC read voltage
        1.70V (MIN)/1.90V (MAX) VCCQ
    MT28C6428P20/P18
        1.80V (TYP) F_VPP (in-system PROGRAM/ERASE)
        1.0V (MIN) S_VCC (SRAM data retention)
        12V ±5% (HV) F_VPP (in-house programming and
            accelerated programming algorithm [APA]
            activation)
• Asynchronous access time
    Flash access time: 80ns @ 1.80V F_VCC
    SRAM access time: 80ns @ 1.80V S_VCC
• Page Mode read access
    Interpage read access: 80ns @ 1.80V F_VCC
    Intrapage read access: 30ns @ 1.80V F_VCC
• Low power consumption
• Enhanced suspend options
    ERASE-SUSPEND-to-READ within same bank
    PROGRAM-SUSPEND-to-READ within same bank
    ERASE-SUSPEND-to-PROGRAM within same bank
• Read/Write SRAM during program/erase of Flash
• Dual 64-bit chip protection registers for security purposes
• PROGRAM/ERASE cycles
    100,000 WRITE/ERASE cycles per block
• Cross-compatible command set support
    Extended command set
    Common flash interface (CFI) compliant