January 2001 |
|
|
AS7C256 |
|
||
Advance Information |
|
AS7C3256 |
|
|||
|
® |
|
|
|
|
|
5V/3.3V 32K X 8 CMOS SRAM (Common I/O) |
|
|||||
|
|
|
|
|
|
|
Features |
|
|
|
|
|
|
• AS7C256 (5V version) |
- 7.2 mW (AS7C3256) / max CMOS I/O |
|
||||
• AS7C3256 (3.3V version) |
• 2.0V data retention |
|
||||
• Industrial and commercial temperature |
• Easy memory expansion with |
CE |
and |
OE |
inputs |
|
• Organization: 262,144 words × 16 bits |
• TTL-compatible, three-state I/O |
|
||||
• High speed |
• 28-pin JEDEC standard packages |
|
||||
- 12/15/20 ns address access time |
- 300 mil PDIP |
|
||||
- 5/6/7/9 ns output enable access time |
- 300 mil SOJ |
|
||||
• Very low power consumption: ACTIVE |
- 8 × 13.4 TSOP |
|
||||
- 660mW (AS7C256) / max @ 12 ns |
• ESD protection ≥ 2000 volts |
|
||||
- 216mW (AS7C3256) / max @ 12 ns |
• Latch-up current ≥ 200 mA |
|
||||
•Very low power consumption: STANDBY
- 22 mW (AS7C256) / max CMOS I/O
Logic block diagram |
Pin arrangement |
VCC
GND 
A0
A1
A2
A3
A4
A5
A6
A14
Row decoder
Input buffer |
|
|
|
I/O7 |
|
256 X 128 X 8 |
amp |
|
Array |
||
Sense |
||
(262,144) |
||
|
||
|
I/O0 |
|
Column decoder |
WE |
|
Control |
||
|
||
|
OE |
|
|
circuit |
CE
A A A A A A A 7 8 9 10 11 12 13
28-pin TSOP I (8×13.4) |
28-pin DIP, SOJ (300 mil) |
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
OE |
|
1 |
(22) |
|
(21) |
28 |
|
A10 |
|
A11 |
|
2 |
(23) |
|
(20) |
27 |
|
CE |
||
|
A9 |
|
3 |
(24) |
|
(19) |
26 |
|
I/O7 |
|
|
A8 |
|
4 |
(25) |
|
(18) |
25 |
|
I/O6 |
|
A13 |
|
5 |
(26) |
|
(17) |
24 |
|
I/O5 |
||
WE |
|
6 |
(27) |
|
(16) |
23 |
|
I/O4 |
||
VCC |
|
7 |
(28) |
AS7C256 |
(15) |
22 |
|
I/O3 |
||
|
|
|||||||||
A14 |
|
8 |
(1) |
AS7C3256 |
(14) |
21 |
|
GND |
||
A12 |
|
9 |
(2) |
(13) |
20 |
|
I/O2 |
|||
|
A7 |
|
10 |
(3) |
|
(12) |
19 |
|
I/O1 |
|
|
A6 |
|
11 |
(4) |
|
(11) |
18 |
|
I/O0 |
|
|
A5 |
|
12 |
(5) |
|
(10) |
17 |
|
A0 |
|
|
A4 |
|
13 |
(6) |
|
(9) |
16 |
|
A1 |
|
|
A3 |
|
14 |
(7) |
|
(8) |
15 |
|
A2 |
|
|
|
|
||||||||
Note: This part is compatible with both pin numbering conventions used by various manufacturers.
A14 |
|
1 |
|
||
A12 |
|
2 |
|
||
A7 |
|
3 |
|
||
A6 |
|
4 |
|
||
A5 |
|
5 |
|
||
A4 |
|
6 |
|
||
A3 |
|
7 |
|
||
A2 |
|
8 |
|
||
A1 |
|
9 |
|
||
A0 |
|
10 |
|
||
I/O0 |
|
11 |
|
||
I/O1 |
|
12 |
|
||
I/O2 |
|
13 |
|
||
GND |
|
14 |
|
||
|
|
|
AS7C256 |
AS7C3256 |
28 
VCC
27 
WE
26 
A13
25 
A8
24 
A9
23 
A11
22 
OE
21 
A10
20 
CE
19 
I/O7
18 
I/O6
17 
I/O5
16 
I/O4
15 
I/O3
Selection guide
|
|
AS7C256-10 |
AS7C256-12 |
AS7C256-15 |
AS7C256-20 |
|
|
|
AS7C3256-10 |
AS7C3256-12 |
AS7C3256-15 |
AS7C3256-20 |
Unit |
|
|
|
|
|
|
|
Maximum address access time |
|
10 |
12 |
15 |
20 |
ns |
|
|
|
|
|
|
|
Maximum output enable access time |
|
5 |
6 |
7 |
ns |
|
|
|
|
|
|
|
|
Maximum operating current |
AS7C256 |
|
120 |
115 |
110 |
mA |
|
|
|
|
|
|
|
AS7C3256 |
|
60 |
55 |
50 |
mA |
|
|
|
|||||
|
|
|
|
|
|
|
Maximum CMOS standby |
AS7C256 |
|
4 |
4 |
4 |
mA |
current |
|
|
|
|
|
|
AS7C3256 |
|
2 |
2 |
2 |
mA |
|
|
|
|
|
|
|
|
1/10/2001 |
Alliance Semiconductor |
P. 1 of 9 |
|
|
|
Copyright © Alliance Semiconductor. All rights reserved.