Accutek
Microcircuit
Corporation
AK594096BS / AK594096BG
4,194,304 Word by 9 Bit CMOS
Dynamic Random Access Memory
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 sepa-
rately for each bit, with common RAS and CAS control. This com-
mon I/O feature dictates the use of early-write cycles to prevent
contention of data In and data out. Since the Write-Enable (WE)i
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,
data in (D9) and data out (Q9) pins are brought our separately and
controlled by a separate PCAS for that bit
· Power
1.450 Watt Max Active, 70 nSEC
1.610 Watt Max Active, 60 nSEC
16.5 mWatt Max Standy
FEATURES
· 4,194,304 x 9 bit organization
· Operating free air temperature 00C to 700C
· Low Profile 30 pad (SIM) Single In-Line Memory
· Low Profile 30 pin (SIP) Single In-Line package
· JEDEC standard pinout
· 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
· Refresh cycle 2048 cycles in 32 mSEC
PIN NOMENCLATURE
PIN ASSIGNMENT
FUNCTIONAL DIAGRAM
A0 - A10
A0 - A10
RAS0
CAS
WE
Address Inputs
+
A0 - A10
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4
11
RAS
CAS
WE
1
2
Vcc
CAS
DQ1
A0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
DQ5
A8
+
+
+
*
*
*
Row Address Strobe
Column Address Strobe
Write Enable
Output Enable
Data In/Data Out
Data In
3
A9
DQ1 +
*
DQ2
DQ3
DQ4
+
+
+
*
*
*
4
A10
DQ6
WE
Vss
DQ7
NC
5
A1
OE
OE
Q
*
OE
6
DQ2
A2
7
DQ1 - DQ8
D9
8
A3
A0 - A9
RAS
CAS
WE
DQ1
DQ2
DQ3
DQ4
*
*
*
9
Vss
DQ3
A4
10
11
12
13
14
15
DQ8
NC
Q9
Data Out
DQ5 +
*
DQ6
DQ7
DQ8
+
+
+
*
*
*
Vcc
5v Supply
A5
RAS0
NC
*
DQ4
A6
Vss
Ground
NC
NC
No Connect
A7
Vcc
A0 - A11
RAS
CAS
*
*
PCAS
+
MODULE OPTIONS
* WE
Leadless SIM: AK594096BS
Leaded SIP: AK594096BG
D9
Q9
+
+
D
*
*