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IDT70V3389S Datasheet(PDF) 15 Page - Integrated Device Technology

Part No. IDT70V3389S
Description  HIGH-SPEED 3.3V SYNCHRONOUS PIPELINED DUAL-PORT STATIC RAM
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Maker  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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IDT70V3389S Datasheet(HTML) 15 Page - Integrated Device Technology

 
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6.42
IDT70V3389S
High-Speed 64K x 18 3.3V Dual-Port Synchronous Pipelined Static RAM
Industrial and Commercial Temperature Ranges
15
Func t iona l De sc ript ion
The IDT70V3389 provides a true synchronous Dual-Port Static
RAM interface. Registered inputs provide minimal set-up and hold
times on address, data, and all critical control inputs. All internal
registers are clocked on the rising edge of the clock signal, however,
the self-timed internal write pulse is independent of the LOW to HIGH
transition of the clock signal.
An asynchronous output enable is provided to ease asynchro-
nous bus interfacing. Counter enable inputs are also provided to stall
the operation of the address counters for fast interleaved memory
applications.
A HIGHon CE0or a LOWon CE1 for one clock cycle will power down
the internal circuitry to reduce static power consumption. Multiple chip
enables allow easier banking of multiple IDT70V3389s for depth expan-
sion configurations. Two cycles are required with CE0 LOW and CE1
HIGHto re-activate the outputs.
4832 drw 14
IDT70V3389
CE0
CE1
CE1
CE0
CE0
CE1
A16
CE1
CE0
VDD
VDD
IDT70V3389
IDT70V3389
IDT70V3389
Control Inputs
Control Inputs
Control Inputs
Control Inputs
UB, LB
R/W,
OE,
CLK,
ADS,
CNTRST,
CNTEN
.
De pt h a nd Widt h Ex pa nsion
The IDT70V3389 features dual chip enables (refer to Truth
Table I) in order to facilitate rapid and simple depth expansion with no
requirements for external logic. Figure 4 illustrates how to control the
various chip enables in order to expand two devices in depth.
TheIDT70V3389canalsobeusedinapplicationsrequiringexpanded
width,asindicatedinFigure4.Throughcombiningthecontrolsignals,the
devices can be grouped as necessary to accommodate applications
needing 36-bits or wider.
Figure 4. Depth and Width Expansion with IDT70V3389


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