AT28HC256 ATMEL Corporation, AT28HC256 Datasheet
AT28HC256
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AT28HC256 Summary of contents
Page 1
... Read Only Memory. Its 256K of memory is organized as 32,768 words by 8 bits. Manufactured with Atmel’s advanced nonvolatile CMOS technology, the AT28HC256 offers access times with power dissipation of just 440 mW. When the AT28HC256 is deselected, the standby current is less than 5 mA. Pin Configurations Pin Name ...
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... Description (Continued) The AT28HC256 is accessed like a Static RAM for the read or write cycle without the need for external compo- nents. The device contains a 64-byte page register to al- low writing 64-bytes simultaneously. During a write cycle, the address and 1 to 64-bytes of data are in- ternally latched, freeing the addresses and data bus for other operations ...
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... WC tected against inadvertent write operations. It should be noted, that once protected the host may still perform a byte or page write to the AT28HC256. This is done by pre- ceding the data to be written by the same 3-byte command sequence. Once set, SDP will remain active unless the disable com- mand sequence is issued ...
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... MHz OUT AT28HC256-12 0°C - 70°C -40°C - 85°C -55°C - 125°C 10% 5V 10 OUT High High Z V High Z IL 0.5V. Min Max 10 10 AT28HC256-90, -12 3 AT28HC256-70 60 AT28HC256-90, -12 300 80 0.8 2.0 .45 2.4 Units ...
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... ACC after the falling 4. This parameter is characterized and is not 100% tested ACC OE . ACC Output Test Load (1) Typ Max AT28HC256 AT28C256-90 AT28HC256-12 Min Max Min Max 90 120 90 120 Units Conditions ...
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... Chip Select Hold Time CH t Write Pulse Width ( Data Set-up Time Data, OE Hold Time DH OEH t Time to Data Valid DV Note Restriction AC Write Waveforms WE Controlled CE Controlled AT28HC256 2-284 Min Max Units 100 (1) NR ...
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... Notes through A14 must specify the same page address during each high to low transition of WE (or CE must be high only when WE and CE are both low. Chip Erase Waveforms sec (min msec (min 12.0V 0.5V H Min AT28HC256 AT28HC256F 100 50 (1, 2) AT28HC256 Typ Max Units 3 150 s ns 2-285 ...
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... Software Protected Write Cycle Waveforms Notes through A14 must specify the same page address during each high to low transition of WE (or CE) after the software code has been entered must be high only when WE and CE are both low. AT28HC256 2-286 Software Data (1) ...
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... Beginning and ending state of I/O6 will vary (1) Min See AC Read Characteristics. (1) Min 10 10 (2) 150 0 2. See AC Read Characteristics. 3. Any address location may be used but the AT28HC256 Typ Max Typ Max address should not vary. Units Units ...
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... AT28HC256 2-288 ...
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... AT28HC256(E,F)-90PI AT28HC256(E,F)-90DM/883 AT28HC256(E,F)-90FM/883 AT28HC256(E,F)-90LM/883 AT28HC256(E,F)-90UM/883 AT28HC256(E,F)-12JC AT28HC256(E,F)-12PC AT28HC256(E,F)-12SC AT28HC256(E,F)-12TC AT28HC256(E,F)-12JI AT28HC256(E,F)-12PI AT28HC256(E,F)-12SI AT28HC256(E,F)-12TI AT28HC256(E,F)-12DM/883 AT28HC256(E,F)-12FM/883 AT28HC256(E,F)-12LM/883 AT28HC256(E,F)-12UM/883 5962-88634 03 UX 5962-88634 03 XX 5962-88634 03 YX 5962-88634 03 ZX ...
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... Ordering Information Note Previous data sheets included the low power suffixes L, LE and LF on the AT28HC256 for 120 ns and 90 ns speeds. The low power parameters are now standard ; therefore, the L, LE and LF suffixes are no longer required. Valid Part Numbers The following table lists standard Atmel products that can be ordered. ...