AK491024S Datasheet, PDF (1/2 Pages) ACCUTEK MICROCIRCUIT CORPORATION – 1,048,576 Word x 9 Bit CMOS Dynamic Random Access Memory

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
30-Pin SIP
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
Data In / Data Out
Data In 9
PIN #
1
2
SYMBOL
Vcc
CAS
PIN #
16
17
Q9
A0 - A9
CAS, PCAS
Data Out 9
3
4
Address Inputs
5
Column Address Strobe ₆
DQ1
18
A0
19
A1
20
DQ2
21
RAS
WE
Vcc
Row Address Strobe
7
A2
22
Write Enable
5v Supply
8
A3
23
9
Vss
24
10
DQ3
25
Vss
Ground
NC
No Connect
11
A4
26
12
A5
27
13
DQ4
28
MODULE OPTIONS
14
A6
29
15
A7
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