Материал: 28040
AC Write Characteristics
Symbol |
Parameter |
Min |
Max |
Units |
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tAS, tOES |
Address, OE Set-up Time |
0 |
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ns |
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tAH |
Address Hold Time |
50 |
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ns |
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tCS |
Chip Select Set-up Time |
0 |
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ns |
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tCH |
Chip Select Hold Time |
0 |
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ns |
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tWP |
Write Pulse Width (WE or CE) |
100 |
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ns |
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tDS |
Data Set-up Time |
50 |
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ns |
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tDH, tOEH |
Data, OE Hold Time |
0 |
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ns |
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AC Write Waveforms
WE Controlled
CE Controlled
2-260 AT28C040 
AT28C040
Page Mode Characteristics
Symbol |
Parameter |
Min |
Max |
Units |
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tWC |
Write Cycle Time |
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10 |
ms |
tAS |
Address Set-up Time |
0 |
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ns |
tAH |
Address Hold Time |
50 |
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ns |
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tDS |
Data Set-up Time |
50 |
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ns |
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tDH |
Data Hold Time |
0 |
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ns |
tWP |
Write Pulse Width |
100 |
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ns |
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tBLC |
Byte Load Cycle Time |
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150 |
μs |
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tWPH |
Write Pulse Width High |
50 |
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ns |
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Page Mode Write Waveforms (1, 2)
Notes: 1. A8 through A18 must specify the page address during each high to low transition of WE (or CE). 2. OE must be high only when WE and CE are both low.
2-261
Software Data
Protection Enable Algorithm (1)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
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LOAD DATA A0 |
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TO |
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ADDRESS 5555 |
WRITES ENABLED (2) |
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LOAD DATA XX |
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TO |
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ANY ADDRESS (4) |
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LOAD LAST BYTE |
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TO |
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LAST ADDRESS |
ENTER DATA |
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PROTECT STATE |
Notes:
1.Data Format: I/O7 - I/O0 (Hex); Address Format: A14 - A0 (Hex).
2.Write Protect state will be activated at end of write even if no other data is loaded.
3.Write Protect state will be deactivated at end of write period even if no other data is loaded.
4.1 to 256-bytes of data are loaded.
Software Data
Protection Disable Algorithm (1)
LOAD DATA AA |
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TO |
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ADDRESS 5555 |
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LOAD DATA 55 |
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TO |
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ADDRESS 2AAA |
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LOAD DATA 80 |
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TO |
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ADDRESS 5555 |
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LOAD DATA AA |
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TO |
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ADDRESS 5555 |
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LOAD DATA 55 |
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TO |
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ADDRESS 2AAA |
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LOAD DATA 20 |
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TO |
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ADDRESS 5555 |
EXIT DATA |
LOAD DATA XX |
PROTECT STATE (3) |
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TO |
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ANY ADDRESS (4) |
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LOAD LAST BYTE
TO
LAST ADDRESS
Software Protected Program Cycle Waveform (1, 2, 3)
Notes: 1. A0 - A14 must conform to the addressing sequence for 3. OE must be high only when WE and CE are both low. the first 3-bytes as shown above.
2.After the command sequence has been issued and a page write operation follows, the page
address inputs (A8 - A18) must be the same for each high to low transition of WE (or CE).
2-262 AT28C040 
AT28C040
Data Polling Characteristics (1)
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Symbol |
Parameter |
Min |
Typ |
Max |
Units |
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tDH |
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Data Hold Time |
10 |
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ns |
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tOEH |
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OE Hold Time |
10 |
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ns |
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to Output Delay (2) |
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tOE |
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OE |
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ns |
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tWR |
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Write Recovery Time |
0 |
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ns |
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Notes: 1. These parameters are characterized and not 100% tested. |
2. See AC Read Characteristics. |
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Data Polling Waveforms
Toggle Bit Characteristics (1)
Symbol |
Parameter |
Min |
Typ |
Max |
Units |
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tDH |
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Data Hold Time |
10 |
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ns |
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tOEH |
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OE Hold Time |
10 |
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ns |
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to Output Delay (2) |
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tOE |
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OE |
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ns |
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tOEHP |
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OE High Pulse |
150 |
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ns |
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tWR |
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Write Recovery Time |
0 |
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ns |
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Notes: 1. These parameters are characterized and not 100% tested. |
2. See AC Read Characteristics. |
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Toggle Bit Waveforms (1, 2, 3)
Notes: 1. Toggling either OE or CE or both OE and CE will operate toggle bit.
2. Beginning and ending state of I/O6 will vary.
3.Any address location may be used but the address should not vary.
2-263
Ordering Information (1)
tACC |
ICC (mA) |
Ordering Code |
Package |
Operation Range |
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(ns) |
Active |
Standby |
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150 |
80 |
0.3 |
AT28C040-15BC |
32B |
Commercial |
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AT28C040-15FC |
32F |
(0° to 70°C) |
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AT28C040-15LC |
44L |
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80 |
0.3 |
AT28C040-15BI |
32B |
Industrial |
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AT28C040-15FI |
32F |
(-40° to 85°C) |
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AT28C040-15LI |
44L |
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80 |
0.3 |
AT28C040-15BM |
32B |
Military |
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AT28C040-15FM |
32F |
(-55°C to 125°C) |
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AT28C040-15LM |
44L |
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80 |
0.3 |
AT28C040-15BM/883 |
32B |
Military/883C |
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AT28C040-15FM/883 |
32F |
Class B, Fully Compliant |
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AT28C040-15LM/883 |
44L |
(-55°C to 125°C) |
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200 |
80 |
0.3 |
AT28C040-20BC |
32B |
Commercial |
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AT28C040-20FC |
32F |
(0° to 70°C) |
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AT28C040-20LC |
44L |
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80 |
0.3 |
AT28C040-20BI |
32B |
Industrial |
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AT28C040-20FI |
32F |
(-40° to 85°C) |
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AT28C040-20LI |
44L |
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80 |
0.3 |
AT28C040-20BM |
32B |
Military |
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AT28C040-20FM |
32F |
(-55°C to 125°C) |
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AT28C040-20LM |
44L |
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80 |
0.3 |
AT28C040-20BM/883 |
32B |
Military/883C |
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AT28C040-20FM/883 |
32F |
Class B, Fully Compliant |
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AT28C040-20LM/883 |
44L |
(-55°C to 125°C) |
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250 |
80 |
0.3 |
AT28C040-25BC |
32B |
Commercial |
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AT28C040-25FC |
32F |
(0° to 70°C) |
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AT28C040-25LC |
44L |
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80 |
0.3 |
AT28C040-25BI |
32B |
Industrial |
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AT28C040-25FI |
32F |
(-40° to 85°C) |
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AT28C040-25LI |
44L |
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80 |
0.3 |
AT28C040-25BM |
32B |
Military |
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AT28C040-25FM |
32F |
(-55°C to 125°C) |
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AT28C040-25LM |
44L |
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80 |
0.3 |
AT28C040-25BM/883 |
32B |
Military/883C |
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AT28C040-25FM/883 |
32F |
Class B, Fully Compliant |
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AT28C040-25LM/883 |
44L |
(-55°C to 125°C) |
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Note: 1. See Valid Part Numbers on next page.
2-264 AT28C040 