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DS1609 Datasheet

  • DS1609

  • Dual Port RAM

  • 81.48KB

  • Dallas

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DS1609
DS1609
Dual Port RAM
FEATURES
PIN ASSIGNMENT
PORT A
AD7
A
AD6
A
AD5
A
AD4
A
AD3
A
AD2
A
AD1
A
AD0
A
WE
A
CE
A
OE
A
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
PORT B
V
CC
OE
B
CE
B
WE
B
AD0
B
AD1
B
AD2
B
AD3
B
AD4
B
AD5
B
AD6
B
AD7
B
鈥?/div>
Totally asynchronous 256鈥揵yte dual port memory
鈥?/div>
Multiplexed address
low
and data bus keeps pin count
鈥?/div>
Dual
port memory cell allows random access with
minimum arbitration
nals
鈥?/div>
Each port has standard independent RAM control sig-
鈥?/div>
Fast access time
鈥?/div>
Low power CMOS design
鈥?/div>
24鈥損in DIP or 24鈥損in SOIC surface mount package
鈥?/div>
Both CMOS and TTL compatible
鈥?/div>
Operating temperature of 鈥?0掳C to +85掳C
鈥?/div>
Standby current of 100 nA @ 25掳C makes the device
ideal for battery backup or battery operate applica-
tions.
DS1609
24鈥揚IN DIP (600 MIL)
See Mech. Drawings
Section
PORT A
AD7
A
AD6
A
AD5
A
AD4
A
AD3
A
AD2
A
AD1
A
AD0
A
WE
A
CE
A
OE
A
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
PORT B
V
CC
OE
B
CE
B
WE
B
AD0
B
AD1
B
AD2
B
AD3
B
AD4
B
AD5
B
AD6
B
AD7
B
DS1609S
24鈥揚IN SOIC (300 MIL)
See Mech. Drawings
Section
PIN DESCRIPTION
AD0鈥揂D7
CE
WE
OE
V
CC
GND
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Port address/data
Port enable
Write enable
Output enable
+5 volt supply
Ground
DESCRIPTION
The DS1609 is a random access 256鈥揵yte 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鈥損in DIP and 24鈥損in SOIC. Output enable access
time of 50 ns is available when operating at 5 volts.
020499 1/7

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