IDT71V2556S166PFI datasheet, PDF

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IDT71V2556S166PFI: Description128K x 36, 256K x 18 3.3V Synchronous ZBT SRAMs 2.5V I/O, Burst Counter Pipelined Outputs; File Size537KB，28 Pages; ManufacturerIDT (Integrated Device Technology, Inc.); Websitehttp://www.idt.com/

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IDT71V2556S166PFI Overview

128K x 36, 256K x 18 3.3V Synchronous ZBT SRAMs 2.5V I/O, Burst Counter Pipelined Outputs

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128K x 36, 256K x 18

IDT71V2556S/XS

3.3V Synchronous ZBT™ SRAMs

IDT71V2558S/XS

2.5V I/O, Burst Counter

IDT71V2556SA/XSA

Pipelined Outputs

IDT71V2558SA/XSA

◆

Features

128K x 36, 256K x 18 memory configurations

Supports high performance system speed - 200 MHz

(3.2 ns Clock-to-Data Access)

ZBT

Feature - No dead cycles between write and read

cycles

Internally synchronized output buffer enable eliminates the

need to control

Single R/W (READ/WRITE) control pin

Positive clock-edge triggered address, data, and control

signal registers for fully pipelined applications

4-word burst capability (interleaved or linear)

Individual byte write (BW

) control (May tie active)

Three chip enables for simple depth expansion

3.3V power supply (±5%), 2.5V I/O Supply (V

DDQ)

Optional - Boundary Scan JTAG Interface (IEEE 1149.1

complaint)

Packaged in a JEDEC standard 100-pin plastic thin quad

flatpack (TQFP), 119 ball grid array (BGA) and 165 fine pitch

ball grid array (fBGA)

Description

The IDT71V2556/58 are 3.3V high-speed 4,718,592-bit (4.5 Mega-

bit) synchronous SRAMS. They are designed to eliminate dead bus cycles

when turning the bus around between reads and writes, or writes and

reads. Thus, they have been given the name ZBT

, or Zero Bus

Turnaround.

Address and control signals are applied to the SRAM during one clock

cycle, and two cycles later the associated data cycle occurs, be it read

or write.

The IDT71V2556/58 contain data I/O, address and control signal

registers. Output enable is the only asynchronous signal and can be used

to disable the outputs at any given time.

A Clock Enable (CEN) pin allows operation of the IDT71V2556/58 to

be suspended as long as necessary. All synchronous inputs are ignored

when (CEN) is high and the internal device registers will hold their previous

values.

There are three chip enable pins (CE

, CE

) that allow the user

to deselect the device when desired. If any one of these three are not

asserted when ADV/LD is low, no new memory operation can be initiated.

However, any pending data transfers (reads or writes) will be completed.

The data bus will tri-state two cycles after chip is deselected or a write is

initiated.

The IDT71V2556/58 has an on-chip burst counter. In the burst mode,

the IDT71V2556/58 can provide four cycles of data for a single address

presented to the SRAM. The order of the burst sequence is defined by the

LBO

input pin. The

LBO

pin selects between linear and interleaved burst

sequence. The ADV/LD signal is used to load a new external address

(ADV/LD = LOW) or increment the internal burst counter (ADV/LD =

HIGH).

The IDT71V2556/58 SRAMs utilize IDT's latest high-performance

CMOS process and are packaged in a JEDEC standard 14mm x 20mm

100-pin thin plastic quad flatpack (TQFP) as well as a 119 ball grid array

(BGA) and a 165 fine pitch ball grid array (fBGA).

Pin Description Summary

-A

, CE

R/W

CEN

CLK

ADV/LD

LBO

TMS

TDI

TCK

TDO

TRST

I/O

-I/O

, I/O

-I/O

, V

DDQ

Address Inputs

Chip Enables

Output Enable

Read/Write Signal

Clock Enable

Input

Output

Input

I/O

Supply

Synchronous

Asynchronous

Synchronous

N/A

Synchronous

Static

Synchronous

N/A

Synchronous

Asynchronous

Synchronous

Static

Individual Byte Write Selects

Clock

Advance burst address / Load new address

Linear / Interleaved Burst Order

Test Mode Select

Test Data Input

Test Clock

Test Data Output

JTAG Reset (Optional)

Sleep Mode

Data Input / Output

Core Power, I/O Power

Ground

MAY 2010

DSC-4875/11

4875 tbl 01

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