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WED8L24257V Datasheet(PDF) 1 Page - White Electronic Designs Corporation

Part No. WED8L24257V
Description  Asynchronous SRAM, 3.3V, 256Kx24
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Maker  WEDC [White Electronic Designs Corporation]
Homepage  http://www.whiteedc.com
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WED8L24257V Datasheet(HTML) 1 Page - White Electronic Designs Corporation

   
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White Electronic Designs Corporation • (508) 366-5151 • www.whiteedc.com
July 2002 Rev. 1A
ECO #15432
WED8L24257V
FIG. 1
PIN NAMES
BLOCK DIAGRAM
PIN SYMBOLS
PIN CONFIGURATION
Asynchronous SRAM, 3.3V, 256Kx24
FEATURES
n 256Kx24 bit CMOS Static
n Random Access Memory Array
• Fast Access Times: 10, 12, and 15ns
• Master Output Enable and Write Control
• TTL Compatible Inputs and Outputs
• Fully Static, No Clocks
n Surface Mount Package
• 119 Lead BGA (JEDEC MO-163), No. 391
• Small Footprint, 14mmx22mm
• Multiple Ground Pins for Maximum Noise Immunity
n Single +3.3V (±5%) Supply Operation
n DSP Memory Solution
• Motorola DSP5630x
• Analog Devices SHARCTM
DESCRIPTION
The WED8L24257VxxBC is a 3.3V, twelve megabit SRAM con-
structed with three 256Kx8 die mounted on a multi-layer laminate
substrate. With 10 to 15ns access times, x24 width and a 3.3V
operatingvoltage,theWED8L24257Visidealforcreatingasinglechip
memory solution for the Motorola DSP5630x (Figure 8) or a two chip
solution for the Analog Devices SHARCTM DSP (Figure 9).
The single or dual chip memory solutions offer improved system
performance by reducing the length of board traces and the number
of board connections compared to using multiple monolithic devices.
The JEDEC Standard 119 lead BGA provides a 69% space savings
over using six 256Kx4, 300 mil wide SOJs and the BGA package
has a maximum height of 110 mils compared to 148 mils for the SOJ
packages. The BGA package also allows the use of the same
manufacturingandinspectiontechniquesastheMotorolaDSP,which
is also in a BGA package.
A0-17
Address Inputs
E
Chip Enable
W
Master Write Enable
G
Master Output Enable
DQ0-23
Common Data Input/Output
VCC
Power (3.3V ±5%)
GND
Ground
NC
No Connection
1
234
56
7
A
NC
AO
A1A2
A3A4
NC
B
NC
A5
A6
E
A7
A8
NC
C
I/012
NC
NC
NC
NC
NC
I/00
D
I/013
VCC
GND
GND
GND
VCC
I/01
E
I/014
GND
VCC
GND
VCC
GND
I/02
F
I/015
VCC
GND
GND
GND
VCC
I/03
G
I/016
GND
VCC
GND
VCC
GND
I/04
H
I/017
VCC
GND
GND
GND
VCC
I/05
J
NC
GND
VCC
GND
VCC
GND
NC
K
I/018
VCC
GND
GND
GND
VCC
I/06
L
I/019
GND
VCC
GND
VCC
GND
I/07
M
I/020
VCC
GND
GND
GND
VCC
I/08
N
I/021
GND
VCC
GND
VCC
GND
I/09
P
I/022
VCC
GND
GND
GND
VCC
I/010
R
I/023
NC
NC
NC
NC
A17
I/011
T
NC
A9
A10
W
A11
A12
NC
UNC
A13
A14
G
A15
A16
NC
256K x 24
Memory
Array
18
A0-A17
G
W
E
DQ0-7
DQ8-15
DQ16-23


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