AK594096BS / AK594096BG
4,194,304 Word by 9 Bit CMOS
Dynamic Random Access Memory
ACCUTEK
MICROCIRCUIT CORPORATION
Front View
30-Pin SIM
DESCRIPTION
The Accutek AK594096 high density memory module is a CMOS
random access memory organized in 4 Meg x 9 bit words. The as-
sembly consists of two 4 Meg x 4 and one 4 Meg x 1 DRAMs,
mounted on the front side of a printed circuit board in 30 pad SIM
(leadless) or 30 pin SIP (leaded) configuration with
JEDEC-standard pinouts. Designed especially for low-height appli-
cations such as VMEbus boards, this low profile module is 0.550
inch high.
+
+
1
30
30-Pin SIP
+
1
+
The operation is identical to nine 4 Meg x 1 DRAMs. For the lower
eight bits, data input is tied to data output and brought out separately
for each bit, with common RAS and CAS control. This common I/O
feature dictates the use of early-writecycles to prevent contention of
data In and data out. Since the Write-Enable (WE)i signal must al-
ways go low before CAS in a write cycle, Read-Write and
Read-Modify-Write operation is not possible. For the ninth bit, data
in (D9) and data out (Q9) pins are brought our separately and con-
trolled by a separate PCAS for that bit.
· Refresh cycle 2048 cycles in 32 mSEC
· Power
FEATURES
1.450 Watt Max Active, 70 nSEC
1.610 Watt Max Active, 60 nSEC
16.5 mWatt Max Standy
· 4,194,304 x 9 bit organization
· Low Profile 30 pad (SIM) Single In-Line Memory
· Low Profile 30 pin (SIP) Single In-Line package
· JEDEC standard pinout
· Operating free air temperature 00C to 700C
· Downward compatible with AK591024 and AK59256
· Upward compatible with AK5916384
· Common CAS, RAS and WE for the lower eight bits
· CAS-before-RAS refresh
· Fast Page Mode and Static Column Mode versions available,
nibble mode is not possible
PIN NOMENCLATURE
PIN ASSIGNMENT
FUNCTIONAL DIAGRAM
Pin #
1
Symbol
Vcc
CAS
DQ1
A0
Pin #
16
Symbol
DQ5
A8
A0 - A10
A0 - A10
RAS0
CAS
WE
Address Inputs
+
A0 - A10
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4
11
RAS
CAS
WE
+
+
+
*
*
*
Row Address Strobe
Column Address Strobe
Write Enable
Output Enable
Data In/Data Out
Data In
2
17
3
18
A9
DQ1 +
*
DQ2
DQ3
DQ4
+
+
+
*
*
*
4
19
A10
DQ6
WE
5
A1
20
OE
OE
Q
*
OE
6
DQ2
A2
21
7
22
Vss
DQ1 - DQ8
D9
8
A3
23
DQ7
NC
A0 - A9
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4
*
*
*
9
Vss
DQ3
A4
24
10
11
12
13
14
15
25
DQ8
NC
Q9
Data Out
DQ5 +
*
26
DQ6
DQ7
DQ8
+
+
+
Vcc
5v Supply
*
*
*
A5
27
RAS0
NC
*
Vss
Ground
DQ4
A6
28
29
NC
NC
No Connect
A7
30
Vcc
A0 - A11
RAS
CAS
*
*
PCAS
+
MODULE OPTIONS
* WE
Leadless SIM: AK594096BS
Leaded SIP: AK594096BG
D9
Q9
+
+
D
*
*