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AK59256AS_09

AK59256AS_09首页预览图
型号: AK59256AS_09
PDF文件:
  • AK59256AS_09 PDF在线浏览
功能描述: Dynamic Random Access Memory
PDF文件大小: 88.31 Kbytes
PDF页数: 共2页
制造商: ACCUTEK[ACCUTEK MICROCIRCUIT CORPORATION]
制造商LOGO: ACCUTEK[ACCUTEK MICROCIRCUIT CORPORATION] LOGO
制造商网址: http://www.accutekmicro.com
捡单宝
PDF页面索引
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DESCRIPTION
The Accutek AK59256A high density memory modules is a random
access memory organized in 256K x 9 bit words. The assembly
consists of two 256K x 4 and one 256K x 1 DRAMs in surface mount
packages mounted to 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 better than 6 to 1 den
-
sity increase over standard DIP packaging.
The operation of the AK59256A is identical to two 256K x 4 DRAMs
plus one 256K x 1 DRAM. For the lower eight bits data input is tied to
data output and brought out separately for each 256K x 4 device,
with common RAS
, CAS and WE control. The OE pins are tied to
Vss which dictates the use of early-write cycles to prevent conten
-
tion 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 (D
9)
and
data output (Q
9
) pins are brought out separately and controlled by a
separate PCAS
for that bit. Bit nine is generally used for parity.
FEATURES
· 262,144 x 9 bit organization
· Optional 30 Pad SIM (Single In-Line Module) or 30 Pin leaded
SIP (Single In-Line Package)
· JEDEC standard pinout
· Common CAS
, RAS and WE control for the lower eight bits
· Separate PCAS
control for D
9
and Q
9
· Power:
1.26 Watt Max Active (70 nSEC)
1.10 Watt Max Active (80 nSEC)
.935 Wat Max Active (100 nSEC)
22 mWatt Standby (Max)
· Operating free air temperature: 0
o
to 70
o
C
· Upward compatible with AK491024, AK591024, AK594096 and
AK5916384
· Functionally and Pin compatible with AK49256
· Available with access times of 60 nSEC to 100 nSEC
ACCUTEK
MICROCIRCUIT CORPORATION
AK59256AS / AK59256AG
262,144 Word by 9 bit, CMOS
Dynamic Random Access Memory
1
30
+ +
1
++
Front View
30-Pin SIM
30-Pin SIP
PIN NOMENCLATURE
DQ
1
-DQ
8
Data In / Data Out
D
9
Data In
Q
9
Data Out
A
0
-A
9
Address Inputs
CAS, PCAS Column Address Strobe
RAS Row Address Strobe
WE Write Enable
Vcc 5v Supply
Vss Ground
NC No Connect
MODULE OPTIONS
Leadless SIM: AK59256AS
Leaded SIP: AK59256AG
PIN ASSIGNMENT
PIN # SYMBOL PIN # SYMBOL
1 Vcc 16 DQ5
2 CAS 17 A8
3 DQ1 18 NC
4A019NC
5 A1 20 DQ6
6 DQ2 21 WE
7 A2 22 Vss
8 A3 23 DQ7
9 Vss 24 NC
10 DQ3 25 DQ8
11 A4 26 Q9
12 A5 27 RAS
13 DQ4 28 PCAS
14 A6 29 D9
15 A7 30 Vcc
FUNCTIONAL DIAGRAM
*
A0 - A8
DQ1
DQ2
DQ3
DQ4
RAS
CAS
WE
OE
*
*
*
A0 - A8
DQ1
DQ2
DQ3
DQ4
RAS
CAS
WE
OE
*
*
*
A0 - A8
D
RAS
CAS
WE
Q
*
*
*
+
WE
+
+
CAS
RAS
A0 - A8
+
*
*
*
*
+
+
+
+
*
*
*
+
+
+
*
+
*
+
*
+
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ8
D9
Q9
*
+
PCAS
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