6.42

IDT70121/IDT70125

High-Speed 2K x 9 Dual-Port Static RAM with Busy & Interrupt

Industrial and Commercial Temperature Ranges

2

Description

The IDT70121/IDT70125 are high-speed 2K x 9 Dual-Port Static

RAMs.TheIDT70121isdesignedtobeusedasastand-alone9-bitDual-

PortRAMorasa“MASTER”Dual-PortRAMtogetherwiththeIDT70125

“SLAVE”Dual-Portin18-bit-or-morewordwidthsystems.UsingtheIDT

MASTER/SLAVE Dual-Port RAM approach in 18-bit-or-wider memory

systemapplicationsresultsinfull-speed,error-freeoperationwithoutthe

needforadditionaldiscretelogic.

Both devices provide two independent ports with separate control,

address,andI/Opinsthatpermitindependent,asynchronousaccessfor

reads or writes to any location in memory. An automatic power-down

feature,controlledbyCE,permitstheon-chipcircuitryofeachporttoenter

a very low standby power mode.

The IDT70121/IDT70125 utilizes a 9-bit wide data path to allow for

Data/Controlandparitybitsattheuser’soption. Thisfeatureisespecially

usefulindatacommunicationsapplicationswhereitisnecessarytousea

paritybitfortransmission/receptionerrorchecking.

Fabricated using CMOS high-performance technology, these

devices typically operate on only 675mW of power. Low-power (L)

versions offer battery backup data retention capability with each port

typicallyconsuming200µWfroma2Vbattery.

The IDT70121/IDT70125 devices are packaged in a 52-pin PLCC.

NOTES:

2. All GND pins must be connected to ground supply.

3. Package body is approximately .75 in x .75 in x .17 in.

4. This package code is used to reference the package diagram.

5. This text does not indicate orientation of the actual part-marking.