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DS1609 Datasheet(PDF) 1 Page - Dallas Semiconductor

Part No. DS1609
Description  Dual Port RAM
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Maker  DALLAS [Dallas Semiconductor]
Homepage  http://www.dalsemi.com
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DS1609 Datasheet(HTML) 1 Page - Dallas Semiconductor

   
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DS1609
Dual Port RAM
DS1609
020499 1/7
FEATURES
Totally asynchronous 256–byte dual port memory
Multiplexed address and data bus keeps pin count
low
Dual port memory cell allows random access with
minimum arbitration
EachporthasstandardindependentRAMcontrolsig-
nals
Fast access time
Low power CMOS design
24–pin DIP or 24–pin SOIC surface mount package
Both CMOS and TTL compatible
Operating temperature of –40°C to +85°C
Standby current of 100 nA @ 25°C makes the device
ideal for battery backup or battery operate applica-
tions.
PIN ASSIGNMENT
DS1609S
24–PIN SOIC (300 MIL)
VCC
OEB
CEB
WEB
AD0B
AD1B
AD2B
AD3B
AD4B
AD5B
AD6B
AD7B
AD7A
AD6A
AD5A
AD4A
AD3A
AD2A
AD1A
AD0A
WEA
CEA
OEA
GND
PORT A
DS1609
24–PIN DIP (600 MIL)
PORT A
PORT B
VCC
OEB
CEB
WEB
AD0B
AD1B
AD2B
AD3B
AD4B
AD5B
AD6B
AD7B
AD7A
AD6A
AD5A
AD4A
AD3A
AD2A
AD1A
AD0A
WEA
CEA
OEA
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
See Mech. Drawings
Section
See Mech. Drawings
Section
PORT B
PIN DESCRIPTION
AD0–AD7
– Port address/data
CE
– Port enable
WE
– Write enable
OE
– Output enable
VCC
– +5 volt supply
GND
– Ground
DESCRIPTION
The DS1609 is a random access 256–byte dual port
memory designed to connect two asyncronous ad-
dress/data buses together with a common memory ele-
ment.
Both ports have unrestricted access to all
256 bytes of memory, and with modest system disci-
pline no arbitration is required. Each port is controlled
by three control signals: output enable, write enable,
and port enable. The device is packaged in plastic
24–pin DIP and 24–pin SOIC. Output enable access
time of 50 ns is available when operating at 5 volts.


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