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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.
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