AM29F400AT Datasheet, PDF (33/35 Pages) Advanced Micro Devices – 4 Megabit (524,288 x 8-Bit/262,144 x 16-Bit) CMOS 5.0 Volt-only, Sector Erase Flash Memory

SWITCHING WAVEFORMS
Addresses
WE
5555H
t_WC
PRELIMINARY
PA
t_AS ^tAH
Data Polling
PA
t_GHEL
OE
CE
Data
5.0 Volt
t_CP
t_WS
t_DS
t_CPH
A0H
t_DH
PD
t_WHWH1
DQ7 ^DOUT
Notes:
1. PA is address of the memory location to be programmed.
2. PD is data to be programmed at byte address.
3. DQ7 is the output of the complement of the data written to the device.
4. D_OUT is the output of the data written to the device.
5. Figure indicates last two bus cycles of four bus cycle sequence.
6. These waveforms are for the x16 mode.
Figure 19. Alternate CE Controlled Program Operation Timings
20380B-26
ERASE AND PROGRAMMING PERFORMANCE
Limits
Parameter
Typ (Note 1)
Max
Sector Erase Time
1.0
8
Chip Erase Time
11
88
Byte Programming Time
7
300 (Note 3)
Word Programming Time
14
600
Chip Programming Time
3.6
10.8 (Notes 3, 5)
Unit
Comments
sec Excludes 00H programming prior to erasure
sec Excludes 00H programming prior to erasure
µs Excludes system-level overhead (Note 4)
µs Excludes system-level overhead (Note 4)
sec Excludes system-level overhead (Note 4)
Notes:
1. 25°C, 5.0 V V_CC, 100,000 cycles.
2. Although Embedded Algorithms allow for longer chip program and erase time, the actual time will be considerably less since
bytes program or erase significantly faster than the worst case byte.
3. Under worst case condition of 90°C, 4.5 V V_CC, 100,000 cycles.
4. System-level overhead is defined as the time required to execute the four bus cycle command necessary to program each
byte. In the preprogramming step of the Embedded Erase algorithm, all bytes are programmed to 00H before erasure.
5. The Embedded Algorithms allow for 2.5 ms byte program time. DQ5 = “1” only after a byte takes the theoretical maximum time
to program. A minimal number of bytes may require significantly more programming pulses than the typical byte. The majority
of the bytes will program within one or two pulses. This is demonstrated by the Typical and Maximum Programming Times
listed above.
Am29F400AT/Am29F400AB
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