PDM34078SA10QA データシートの表示（PDF） - Paradigm Technology

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PDM34078SA10QA

3.3V 32K x 32 Fast CMOS Synchronous Static RAM with Burst Counter and Output Register

Paradigm Technology 

PDM34078

3.3V 32K x 32 Fast CMOS

Synchronous Static RAM

1 with Burst Counter

and Output Register

Features

n Interfaces directly with the x86, Pentium™, 680X0

and PowerPC™ processors

(100, 80, 66, 60, 50 MHz)

n Single 3.3V power supply

n Mode selectable for interleaved or linear burst:

Interleaved for x86 and Pentium

Linear for 680x0 and PowerPC

n High-speed clock cycle times:

10, 12.5, 15, 16.7 and 20 ns

n High-density 32K x 32 architecture with burst

address counter and output register

n Fully registered inputs and outputs for pipelined

operation

n High-output drive: 30 pF at rated TA

n Asynchronous output enable

n Self-timed write cycle

n Separate byte write enables and one global write

enable

n Internal burst read/write address counter

n Internal registers for address, data, controls

n Output data register

n Burst mode selectable

n Sleep mode

n Packages:

100-pin QFP - (Q)

100-pin TQFP - (TQ)

Description

2

The PDM34078 is a 1,048,576 bit synchronous

random access memory organized as 32,768 x 32

3 bits. This device designed with burst mode

capability and interface controls to provide high-

performance in second level cache designs for x86,

Pentium, 680x0, and PowerPC microprocessors.

4 Addresses, write data and all control signals except

output enable are controlled through positive edge-

triggered registers. Write cycles are self-timed and

are also initiated by the rising edge of the clock.

5 Controls are provided to allow burst reads and

writes of up to four words in length. A 2-bit burst

address counter controls the two least-significant

bits of the address during burst reads and writes.

6 The burst address counter selectively uses the 2-bit

counting scheme required by the x86 and Pentium

or 680x0 and PowerPC microprocessors as con-

trolled by the mode pin. Individual write strobes

provide byte write for the four 8-bit bytes of data.

7 An asynchronous output enable simplifies interface

to high-speed buses.

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TM i486, Pentium are trademarks of Intel Corp. PowerPC is a trademark of the International Business Machines Corporation.

Rev 1.0 - 5/01/98

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