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White Electronic Designs - Asynchronous SRAM

Numéro de référence WED8L24258V
Description Asynchronous SRAM
Fabricant White Electronic Designs 
Logo White Electronic Designs 





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WED8L24258V fiche technique
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WED8L24258V
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
• Three Chip Enables for Byte 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 WED8L24258VxxBC 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
operating voltage, the WED8L24258V is ideal for creating a single chip
memory solution for the Motorola DSP5630x or a two chip solution
for the Analog Devices SHARCTM DSP.
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
manufacturing and inspection techniques as the Motorola DSP, which
is also in a BGA package.
FIG. 1
PIN CONFIGURATION
PIN SYMBOLS
12 3 45 67
A NC AO A1 A2 A3 A4 NC
B NC A5 A6 E0 A7 A8 NC
C I/012 N C E2 N C E3 N C 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 N C N C N C N C A17 I/011
T N C A9 A10
W A11 A12 N C
U N C A13 A14
G A15 A16 N C
A0-17
E
W
G
DQ0-23
VCC
GND
NC
PIN NAMES
Address Inputs
Chip Enable
Master Write Enable
Master Output Enable
Common Data Input/Output
Power (3.3V ±5%)
Ground
No Connection
BLOCK DIAGRAM
A0-A17
G
W
E0
E2
E3
18
256K x 24
Memory
Array
DQ0-7
DQ8-15
DQ16-23
July 2002 Rev. 0A
ECO #15432
1 White Electronic Designs Corporation • (508) 366-5151 • www.whiteedc.com

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