Microchip Technology Inc

AT28HC256

In Production

The Microchip AT28HC256 is a high-performance 256Kbit Parallel EEPROM available in both Industrial and Military temp ranges, offering access times to 70ns with power dissipation of 440mW. Deselected, CMOS standby current is less than 5mA. Accessed like static RAM for the read or write cycle without external components, it contains a 64-byte page register to allow writing of up to 64 bytes simultaneously. Features an internal Error Correction Circuit for extended endurance and improved data retention, in Military version. Optional Software Data Protection mechanism guards against inadvertent writes; and an extra 64 bytes of EEPROM enables device identification or tracking.

The AT28HC256 is also available DUAL MARKED where applicable with the appropriate Standard Military Drawing Number - 5962-886340xxx.  See the datasheet for exact MIL product availability.

 

    Features

        • 32 Kbits x 8 (256 Kbit)
        • 5V ± 10% Supply
        • Parallel Interface
          • 70ns access time
        • Self-Timed Erase and Write Cycles (10 ms max)
          • Page Write and Byte Write
          • Data Polling for end of write detection
        • Low Power Consumption
          • Read / Write current 80 mA (Max)
          • Standby current TTL 3 mA (Max), CMOS 300 μA (Max)
        • Write-Protection
          • Hardware Protection
          • Software Data Protect
        • High-endurance Option 100,000 erase/write cycles
        • Data retention > 10 years
        • Temperature Ranges
          • Standard Temperature Range: -40°C to 85°C
          • Military Temperature Range: -55°C to 125°C
        • Available in Green (Pb/Halide-free) Packaging
          • 32-lead, Plastic J-leaded Chip Carrier (PLCC)
          • 28-lead, 0.300" Wide, Plastic Gull Wing Small Outline (SOIC)
          • 28-lead, Plastic Thin Small Outline Package (TSOP)
        • Available in Dual marked (5962-886340xxx) CERAMIC Hermetic Packaging
          • 28-Lead, 0.600" Wide, Non-Windowed, Ceramic Dual Inline (Cerdip)
          • 28-Lead, Non-Windowed, Ceramic Bottom-Brazed Flat Package (Flatpack)
          • 32-Pad, Non-windowed, Ceramic, Leadless Chip Carrier (LCC)
    Parameter Name
    Value
    Density
    256Kb
    Op. Volt Range (V)
    4.5 to 5.5
    Read Access Time
    70/90/120ns
    Documentation
    Data Sheets
    09/01/2009
    465KB
      Application Notes
     
     
     
    AppNote
    11/01/2004
    197KB
    AppNote
    04/01/2013
    79KB
      Brochures
     
     
     
    Brochures
    12/01/2012
    478KB
    Brochures
    12/10/2016
    4660KB
      Quick Start Guides
     
     
     
     
    Quick Start Guides
    07/01/2014
    114KB
    Pricing & Samples
    All pricing shown in USD only.
    Part Number
    Leads
    Package Type
    Temp Range
    Packing
    1+
    26+
    100+
    1000+
    5000+
    Buy
    Sample
    AT28HC256-12JU
    32
    PLCC
    -40C to +85C
    TUBE
    6.68
    6.43
    6.18
    5.84
    5.51
     
    AT28HC256-12JU-T
    32
    PLCC
    -40C to +85C
    T/R
    6.72
    6.47
    6.22
    5.88
    5.54
     
    AT28HC256-12SU
    28
    SOIC
    -40C to +85C
    TUBE
    6.87
    6.61
    6.35
    6.01
    5.66
     
    AT28HC256-12SU-T
    28
    SOIC
    -40C to +85C
    T/R
    6.87
    6.61
    6.35
    6.01
    5.66
     
    AT28HC256-12TU
    28
    TSOP
    -40C to +85C
    TRAY
    6.87
    6.61
    6.35
    6.01
    5.66
     
    AT28HC256-12TU-T
    28
    TSOP
    -40C to +85C
    T/R
    6.87
    6.61
    6.35
    6.01
    5.66
     
    AT28HC256-70JU
    32
    PLCC
    -40C to +85C
    TUBE
    8.74
    8.41
    8.08
    7.65
    7.21
     
    AT28HC256-70JU-T
    32
    PLCC
    -40C to +85C
    T/R
    8.78
    8.45
    8.12
    7.68
    7.24
     
    AT28HC256-70SU
    28
    SOIC
    -40C to +85C
    TUBE
    8.74
    8.41
    8.08
    7.64
    7.21
     
    AT28HC256-70SU-T
    28
    SOIC
    -40C to +85C
    T/R
    8.78
    8.45
    8.12
    7.68
    7.24
     
    AT28HC256-70TU
    28
    TSOP
    -40C to +85C
    TRAY
    8.74
    8.41
    8.08
    7.64
    7.21
     
    AT28HC256-70TU-T
    28
    TSOP
    -40C to +85C
    T/R
    8.74
    8.41
    8.08
    7.64
    7.21
     
    AT28HC256-90JU
    32
    PLCC
    -40C to +85C
    TUBE
    7.51
    7.23
    6.95
    6.57
    6.20
     
    AT28HC256-90JU-600
    32
    PLCC
    -40C to +85C
    TUBE
    8.26
    7.95
    7.65
    7.23
    6.82
     
    AT28HC256-90JU-T
    32
    PLCC
    -40C to +85C
    T/R
    7.56
    7.28
    6.99
    6.62
    6.24
     
    AT28HC256-90SU
    28
    SOIC
    -40C to +85C
    TUBE
    7.85
    7.56
    7.27
    6.87
    6.48
     
    AT28HC256-90SU-T
    28
    SOIC
    -40C to +85C
    T/R
    7.85
    7.56
    7.27
    6.87
    6.48
     
    AT28HC256-90TU
    28
    TSOP
    -40C to +85C
    TRAY
    7.85
    7.56
    7.26
    6.87
    6.48
     
    AT28HC256-90TU-T
    28
    TSOP
    -40C to +85C
    T/R
    7.85
    7.56
    7.26
    6.87
    6.48
     
    AT28HC256E-12JU
    32
    PLCC
    -40C to +85C
    TUBE
    6.75
    6.50
    6.25
    5.91
    5.57
     
    AT28HC256E-12JU-070
    32
    PLCC
    -40C to +85C
    T/R
    7.43
    7.15
    6.88
    6.50
    6.13
     
    AT28HC256E-12JU-T
    32
    PLCC
    -40C to +85C
    T/R
    6.75
    6.50
    6.25
    5.91
    5.57
     
    AT28HC256E-12SU
    28
    SOIC
    -40C to +85C
    TUBE
    6.93
    6.67
    6.41
    6.07
    5.72
     
    AT28HC256E-12SU-202
    28
    SOIC
    -40C to +85C
    T/R
    7.62
    7.34
    7.05
    6.68
    6.29
     
    AT28HC256E-12SU-T
    28
    SOIC
    -40C to +85C
    T/R
    6.98
    6.72
    6.46
    6.11
    5.76
     
    AT28HC256E-12TU
    28
    TSOP
    -40C to +85C
    TRAY
    6.93
    6.67
    6.41
    6.07
    5.72
     
    AT28HC256E-12TU-T
    28
    TSOP
    -40C to +85C
    T/R
    6.93
    6.67
    6.41
    6.07
    5.72
     
    AT28HC256E-90JU
    32
    PLCC
    -40C to +85C
    TUBE
    6.91
    6.66
    6.40
    6.05
    5.70
     
    AT28HC256E-90JU-T
    32
    PLCC
    -40C to +85C
    T/R
    6.96
    6.70
    6.44
    6.09
    5.74
     
    AT28HC256E-90SU
    28
    SOIC
    -40C to +85C
    TUBE
    6.93
    6.67
    6.41
    6.07
    5.72
     
    AT28HC256E-90SU-T
    28
    SOIC
    -40C to +85C
    T/R
    6.93
    6.67
    6.41
    6.07
    5.72
     
    AT28HC256E-90TU
    28
    TSOP
    -40C to +85C
    TRAY
    6.93
    6.67
    6.41
    6.07
    5.72
     
    AT28HC256E-90TU-T
    28
    TSOP
    -40C to +85C
    T/R
    6.93
    6.67
    6.41
    6.07
    5.72
     
    AT28HC256F-90JU
    32
    PLCC
    -40C to +85C
    TUBE
    8.25
    7.95
    7.64
    7.22
    6.81
     
    AT28HC256F-90JU-T
    32
    PLCC
    -40C to +85C
    T/R
    8.25
    7.95
    7.64
    7.22
    6.81
     
    AT28HC256F-90SU
    28
    SOIC
    -40C to +85C
    TUBE
    8.29
    7.98
    7.67
    7.25
    6.84
     
    AT28HC256F-90SU-T
    28
    SOIC
    -40C to +85C
    T/R
    8.32
    8.01
    7.70
    7.28
    6.86
     
    AT28HC256F-90TU
    28
    TSOP
    -40C to +85C
    TRAY
    8.26
    7.95
    7.64
    7.23
    6.82
     
    AT28HC256F-90TU-T
    28
    TSOP
    -40C to +85C
    T/R
    8.26
    7.95
    7.64
    7.23
    6.82
     

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    RoHS Information
    Part
    Number
    Device
    Weight
    Shipping
    Weight
    Lead
    Count
    Package
    Type
    Package
    Width
    Solder
    Composition
    JEDEC
    Indicator
    RoHS
     
    China
    EFUP
    AT28HC256-12JU
    1.129000
    2.333333
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256E-12JU
    1.129000
    2.333333
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256-70JU
    1.129000
    2.333333
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256-90JU
    1.129000
    2.333333
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256-90JU-600
    1.129000
    2.333333
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256E-12JU-070
    1.129000
    1.896000
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256E-70JU
    1.129000
    2.333333
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256E-90JU
    1.129000
    2.333333
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256F-90JU
    1.129000
    2.333333
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256-90JU-T
    1.129000
    1.896000
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256E-90JU-T
    1.129000
    1.896000
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256E-70JU-T
    1.129000
    1.896000
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256E-12JU-T
    1.129000
    1.896000
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256-12JU-T
    1.129000
    1.896000
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256-70JU-T
    1.129000
    1.896000
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256F-90JU-T
    1.129000
    1.896000
    32
    PLCC
    11.5x14x3.37mm
    Matte Tin
    e3
    AT28HC256-70SU
    0.770400
    1.370370
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256E-12SU
    0.770400
    1.370370
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256E-12SU-202
    0.770400
    1.152500
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256E-90SU
    0.770400
    1.370370
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256F-90SU
    0.770400
    1.370370
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256-12SU
    0.770400
    1.370370
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256-90SU
    0.770400
    1.370370
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256E-70SU-T
    0.770400
    1.152500
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256E-12SU-T
    0.770400
    1.152500
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256-70SU-T
    0.770400
    1.152500
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256-90SU-T
    0.770400
    1.152500
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256E-90SU-T
    0.770400
    1.152500
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256F-90SU-T
    0.770400
    1.152500
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256-12SU-T
    0.770400
    1.152500
    28
    SOIC
    .300in
    Matte Tin
    e3
    AT28HC256F-90DM/883
    7.980000
    0.000000
    28
    CERDIP
    .600In
    SnPb
    e0
    AT28HC256-12DM/883
    7.980000
    0.000000
    28
    CERDIP
    .600In
    SnPb
    e0
    AT28HC256-90DM/883
    7.980000
    0.000000
    28
    CERDIP
    .600In
    SnPb
    e0
    AT28HC256E-12DM/883
    7.980000
    0.000000
    28
    CERDIP
    .600In
    SnPb
    e0
    AT28HC256E-90DM/883
    7.980000
    0.000000
    28
    CERDIP
    .600In
    SnPb
    e0
    AT28HC256F-12DM/883
    7.980000
    0.000000
    28
    CERDIP
    .600In
    SnPb
    e0
    AT28HC256-90LM/883
    0.000000
    32
    CLCC
    11.4x14x2.54mm
    SnPb
    e0
    AT28HC256E-12LM/883
    0.000000
    32
    CLCC
    11.4x14x2.54mm
    SnPb
    e0
    AT28HC256F-90LM/883
    0.000000
    32
    CLCC
    11.4x14x2.54mm
    SnPb
    e0
    AT28HC256-12LM/883
    0.000000
    32
    CLCC
    11.4x14x2.54mm
    SnPb
    e0
    AT28HC256F-12LM/883
    0.000000
    32
    CLCC
    11.4x14x2.54mm
    SnPb
    e0
    AT28HC256-90LM/883-696
    0.000000
    32
    CLCC
    11.4x14x2.54mm
    SnPb
    e0
    AT28HC256E-90LM/883
    0.000000
    32
    CLCC
    11.4x14x2.54mm
    SnPb
    e0
    AT28HC256E-12UM/883
    0.000000
    28
    CPGA
    13.6x15.1x2.57mm
    SnPb
    e0
    AT28HC256-90UM/883
    0.000000
    28
    CPGA
    13.6x15.1x2.57mm
    SnPb
    e0
    AT28HC256E-90UM/883
    0.000000
    28
    CPGA
    13.6x15.1x2.57mm
    SnPb
    e0
    AT28HC256F-12UM/883
    0.000000
    28
    CPGA
    13.6x15.1x2.57mm
    SnPb
    e0
    AT28HC256-12UM/883
    0.000000
    28
    CPGA
    13.6x15.1x2.57mm
    SnPb
    e0
    AT28HC256F-90UM/883
    0.000000
    28
    CPGA
    13.6x15.1x2.57mm
    SnPb
    e0
    AT28HC256E-12FM/883
    0.000000
    28
    Flatpack
    10.2x18.3x3.02mm
    SnPb
    e0
    AT28HC256E-90FM/883
    0.000000
    28
    Flatpack
    10.2x18.3x3.02mm
    SnPb
    e0
    AT28HC256F-90FM/883
    0.000000
    28
    Flatpack
    10.2x18.3x3.02mm
    SnPb
    e0
    AT28HC256F-12FM/883
    0.000000
    28
    Flatpack
    10.2x18.3x3.02mm
    SnPb
    e0
    AT28HC256-90FM/883
    0.000000
    28
    Flatpack
    10.2x18.3x3.02mm
    SnPb
    e0
    AT28HC256-90FM/883-023
    0.000000
    28
    Flatpack
    10.2x18.3x3.02mm
    SnPb
    e0
    AT28HC256-12FM/883
    0.000000
    28
    Flatpack
    10.2x18.3x3.02mm
    SnPb
    e0
    AT28HC256-12TU
    0.232100
    0.000000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256E-90TU
    0.232100
    0.000000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256E-12TU
    0.232100
    0.000000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256-70TU
    0.232100
    0.000000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256F-90TU
    0.232100
    0.000000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256-90TU
    0.232100
    0.000000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256E-70TU-T
    0.232100
    0.048000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256-70TU-T
    0.232100
    0.048000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256E-12TU-T
    0.232100
    0.048000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256-12TU-T
    0.232100
    0.048000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256E-90TU-T
    0.232100
    0.048000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256F-90TU-T
    0.232100
    0.048000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    AT28HC256-90TU-T
    0.232100
    0.048000
    28
    TSOP
    8x11.8x1mm
    Matte Tin
    e3
    To see a complete listing of RoHS data for this device, please Click here
    Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.