High Performance
AS29F400
512K×8/256K×16
5V CMOS Flash EEPROM
®
512K×8/256K×16 CMOS Flash EEPROM
Preliminary information
Features
• Organization: 512K×8 or 256K×16
• Low power consumption
- 35 mA maximum read current
- 60 mA maximum program current
- 1 µA typical standby current (RESET = 0)
• JEDEC standard software, packages and pinouts
- 48-pin TSOP
• Sector architecture
- One 16K; two 8K; one 32K; and seven 64K byte sectors
- Boot code sector architecture—T (top) or B (bottom)
- Erase any combination of sectors or full chip
• Single 5.0±0.5V power supply for read/write operations
• Sector protection
- 44-pin SO
• Detection of program/erase cycle completion
- DQ7 DATA polling
- DQ6 toggle bit
- RY/BY output
• Erase suspend/resume
• High speed 55/70/90/120/150 ns address access time
• Automated on-chip programming algorithm
- Automatically programs/verifies data at specified address
• Automated on-chip erase algorithm
- Automatically preprograms/erases chip or specified sectors
- Supports reading data from or programming data to a sector
not being erased
• 10,000 write/erase cycle endurance
• Hardware RESET pin
- Resets internal state machine to read mode
• Low V write lock-out below 3.2V
CC
Logic block diagram
Pin arrangement
48-pin TSOP
44-pin SO
Sector protect
switches
RY/BY
DQ0–DQ15
V
CC
NC
RY/BY
A17
A7
1
44
RESET
WE
V
SS
2
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
Erase voltage
generator
Input/output
buffers
3
A8
RESET
4
A9
A6
5
A10
Program/erase
control
A5
6
A11
WE
BYTE
A4
7
A12
A3
8
A13
Program voltage
generator
Command
register
A2
9
A14
AS29F400
A1
A0
10
11
12
13
14
15
16
17
18
19
20
21
22
A15
A16
STB
Chip enable
Output enable
Logic
Data latch
CE
BYTE
VSS
CE
OE
A-1
VSS
OE
DQ15/A-1
DQ7
DQ14
DQ6
DQ13
DQ5
DQ12
DQ4
VCC
DQ0
DQ8
DQ1
DQ9
DQ2
DQ10
DQ3
DQ11
Y decoder
Y gating
STB
V
detector
Timer
CC
X decoder
Cell matrix
A0–A17
Selection guide
29F400-55 29F400-70 29F400-90 29F400-120 29F400-150 Unit
Maximum access time
t
t
t
55
55
25
70
70
30
90
90
35
120
120
50
150
150
55
ns
ns
ns
AA
CE
OE
Maximum chip enable access time
Maximum output enable access time
ALLIANCE SEMICONDUCTOR
1