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Número de pieza | AK491024G | |
Descripción | 1048576 Word x 9 Bit CMOS Dynamic Random Access Memory | |
Fabricantes | ACCUTEK | |
Logotipo | ||
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No Preview Available ! ACCUTEK
MICROCIRCUIT CORPORATION
DESCRIPTION
The Accutek AK491024 high density memory module is a random
access memory organized in 1 Meg x 9 bit words. The assembly
consists of nine standard 1 Meg x 1 DRAMs in plastic leaded chip
carriers (SOJ) mounted on the front side of a printed circuit board.
The module can be configured as a leadless 30 pad SIM or a leaded
30 pin SIP. This packaging approach provides a 6 to 1 density in-
crease over standard DIP packaging.
The operation of the AK491024 is identical to nine 1 Meg x 1
DRAMs. For the lower eight bits data input is tied to the data output
and brought out separately for each device, with common RAS,
CAS control. This common I/O feature dictates the use of
early-write cycles to prevent contention of D and Q. Since the
Write-Enable (WE) signal must always go low before CAS in a write
cycle, Read-Write and Read-Modify-Write operation is not possible.
For the ninth bit, the data input (D9) and the data output (Q9) pins are
brought out separately and controlled by a separate PCAS for that
bit. Bit nine is generally used for parity.
FEATURES
· 1,048,576 x 9 bit organization
· Optional 30 Pad leadless SIM (Single In-Line Module) or 30
Pin leaded SIP (Single In-Line Package)
· JEDEC standard pinout
· Common CAS and RAS control for the lower eight bits
· Separate PCAS control for D9 and Q9
· CAS-before-RAS refresh
AK491024S / AK491024G
1,048,576 Word x 9 Bit CMOS
Dynamic Random Access Memory
Front View
30-Pin SIM
1
30-Pin SIP
30
1
· Power
3.465 Watt Max Active (80 nSEC)
2.97 Watt Max Active (100 nSEC)
2.475 Watt Max Active (120 nSEC)
49.5 mW Max Standby
· Operating free air temperature 00C to 700C
· Upward compatible with AK594096 and AK5916384
· Downward compatible with AK49256
PIN NOMENCLATURE
PIN ASSIGNMENT
DQ1 - DQ8
D9
Q9
A0 - A9
CAS, PCAS
RAS
WE
Vcc
Vss
NC
Data In / Data Out
Data In 9
Data Out 9
Address Inputs
Column Address Strobe
Row Address Strobe
Write Enable
5v Supply
Ground
No Connect
MODULE OPTIONS
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SYMBOL
Vcc
CAS
DQ1
A0
A1
DQ2
A2
A3
Vss
DQ3
A4
A5
DQ4
A6
A7
PIN #
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Leadless SIM: AK491024S
Leaded SIP: AK491024G
SYMBOL
DQ5
A8
A9
NC
DQ6
WE
Vss
DQ7
NC
DQ8
Q9
RAS
PCAS
D9
Vcc
FUNCTIONAL DIAGRAM
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Páginas | Total 2 Páginas | |
PDF Descargar | [ Datasheet AK491024G.PDF ] |
Número de pieza | Descripción | Fabricantes |
AK491024G | 1048576 Word x 9 Bit CMOS Dynamic Random Access Memory | ACCUTEK |
AK491024S | 1048576 Word x 9 Bit CMOS Dynamic Random Access Memory | ACCUTEK |
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