W24257AS-20 Datasheet PDF - Winbond
| Part Number | W24257AS-20 | |
| Description | 32K X 8 High Speed CMOS Static RAM | |
| Manufacturers | Winbond | |
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W24257A
32K × 8 HIGH SPEED CMOS STATIC RAM
GENERAL DESCRIPTION
The W24257A is a high speed, low power CMOS static RAM organized as 32768 × 8 bits that
operates on a single 5-volt power supply. This device is manufactured using Winbond's high
performance CMOS technology.
FEATURES
• High speed access time: 10/12/15/20 nS (max.)
• Low power consumption:
− Active: 400 mW (typ.)
• Single +5V power supply
• Fully static operation
• All inputs and outputs directly TTL compatible
• Three-state outputs
• Available packages: 28-pin 300 mil SOJ, 330
mil SOP, skinny DIP and standard type one
TSOP (8 mm × 13.4 mm)
PIN CONFIGURATIONS
BLOCK DIAGRAM
A14 1
A12 2
28 VDD
27 WE
A7 3
26 A13
A6 4
25 A8
A5 5
24 A9
A4 6
23 A11
A3 7
22 OE
28-pin
A2 8
DIP
21
A10
A1 9
20 CS
A0 10
19 I/O8
I/O1 11
18 I/O7
I/O2 12
17 I/O6
I/O3 13
16 I/O5
V SS
14
15 I/O4
OE
A11
A9
A8
A13
WE
VDD
A14
A12
A7
A6
A5
A4
A3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28-pin
TSOP
28 A10
27 CS
26 I/O8
25 I/O7
24 I/O6
23 I/O5
22 I/O4
21 VSS
20 I/O3
19 I/O2
18 I/O1
17 A0
16 A1
15 A2
VDD
VSS
A0
. DECODER
.
A14
CORE
ARRAY
CS
OE CONTROL
WE
DATA I/O
I/O1
.
.
I/O8
PIN DESCRIPTION
SYMBOL
DESCRIPTION
A0−A14 Address Inputs
I/O1−I/O8 Data Inputs/Outputs
CS Chip Select Input
WE Write Enable Input
OE Output Enable Input
VDD Power Supply
VSS Ground
Publication Release Date: May 1997
- 1 - Revision A14
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W24257A
AC CHARACTERISTICS
(VDD = 5V ±10%, VSS = 0V, TA = 0 to 70° C)
Read Cycle
PARAMETER
Read Cycle Time
Address Access Time
Chip Select Access Time
Output Enable to Output Valid
Chip Selection to Output in Low Z
Output Enable to Output in Low Z
Chip Deselection to Output in High Z
Output Disable to Output in High Z
Output Hold from Address Change
SYM.
TRC
TAA
TACS
TAOE
TCLZ∗
TOLZ∗
TCHZ∗
TOHZ∗
TOH
W24257A-10
MIN. MAX.
10 -
- 10
- 10
-5
3-
W24257A-12
MIN. MAX.
12 -
- 12
- 12
-6
3-
W24257A-15
MIN. MAX.
15 -
- 15
- 15
-7
3-
W24257A-20
MIN. MAX.
20 -
- 20
- 20
- 10
3-
UNIT
nS
nS
nS
nS
nS
0 - 0 - 0 - 0 - nS
- 5 - 6 - 7 - 10 nS
- 5 - 6 - 7 - 10 nS
3 - 3 - 3 - 3 - nS
∗ These parameters are sampled but not 100% tested.
Write Cycle
PARAMETER
SYM.
W24257A-10
MIN. MAX.
Write Cycle Time
TWC 10 -
Chip Selection to End of Write
TCW 9 -
Address Valid to End of Write
TAW 9 -
Address Setup Time
TAS 0 -
Write Pulse Width
TWP 9 -
Write Recovery Time
CS , WE TWR
0
-
Data Valid to End of Write
Data Hold from End of Write
Write to Output in High Z
Output Disable to Output in High Z
Output Active from End of Write
TDW
TDH
TWHZ∗
TOHZ∗
TOW
6
0
-
-
0
-
-
6
6
-
∗ These parameters are sampled but not 100% tested.
W24257A-12
MIN. MAX.
12 -
10 -
10 -
0-
10 -
0-
7-
0-
-7
-7
0-
W24257A-15
MIN. MAX.
15 -
13 -
13 -
0-
10 -
0-
9-
0-
-8
-8
0-
W24257A-20
MIN. MAX.
20 -
17 -
17 -
0-
12 -
0-
10 -
0-
- 10
- 10
0-
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
Publication Release Date: May 1997
- 5 - Revision A14
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for W24257AS-20 electronic component. |
| Information | Total 11 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ W24257AS-20.PDF Datasheet ] | |
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