Renesas 71V632S6PFGI

Overview

71V632S6PFGI from IDT is a 64K × 32-bit (2 Mbit), 3.3V synchronous SRAM with pipelined outputs, single-cycle deselect, and burst counter logic. It supports 100 MHz operation (5.5 ns clock access), operates across industrial temperature range (–40°C to +85°C), and features LBO-controlled interleaved/linear burst mode for Pentium™ and PowerPC™ processor cache interfaces.

For engineers reviewing the 71V632S6PFGI datasheet, 71V632S6PFGI pinout, 71V632S6PFGI application, or 71V632S6PFGI equivalent, this page delivers verified timing parameters, JEDEC-standard TQFP-100 package mapping, burst sequence behavior, power-down control via ZZ, and byte-write enable functionality - all critical for secondary cache design in legacy high-speed embedded systems.

Technical Context

The 71V632S6PFGI implements a synchronous, pipelined read architecture where the first output data appears one clock cycle after address presentation, enabling 3-1-1-1 burst performance. Its internal burst counter advances A0/A1 automatically based on LBO state, supporting both linear and interleaved addressing sequences without external logic.

Write operations are self-timed using global write (GW), byte write enable (BWE), and four independent byte write controls (BW1–BW4). The device integrates dedicated address, data, and control registers, with CE/CS0/CS1 chip select hierarchy and ADSP/ADSC dual address strobe support for flexible bus interfacing.

Key Specifications

Pinout & Package

71V632S6PFGI is packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body size, with 0.5 mm lead pitch. Pin 1 is located at top-left corner (marked by dot or bevel), and pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous SRAM applications.

Compared with CY7C1371DV33-100AXC and AS7C32099B-10JCN, the 71V632S6PFGI uniquely integrates pipelined burst logic and LBO-selectable addressing - making it irreplaceable for legacy Pentium/PowerPC secondary cache designs without redesigning timing control logic.

Availability

71V632S6PFGI is available at Aetrix Electronics and suitable for desktop motherboard repair, industrial PLC refurbishment, and legacy network equipment maintenance requiring stable component supply and long-term obsolescence mitigation.

Supply support for 71V632S6PFGI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

IDT (Integrated Device Technology) was a fabless semiconductor company specializing in timing, memory interface, and RF solutions before its acquisition by Renesas in 2019.

The 71V632S6PFGI belongs to IDT's high-speed synchronous SRAM product line, designed specifically to meet the burst-access and pipelining requirements of 1990s-era x86 and PowerPC microprocessors.

FAQ

What is the maximum operating frequency supported by the 71V632S6PFGI?

The 71V632S6PFGI supports up to 100 MHz operation, corresponding to a 5.5 ns clock access time. This speed grade is validated across the full industrial temperature range (–40°C to +85°C) and requires strict adherence to setup/hold timing on CLK, ADSP, and address inputs. Operation above 100 MHz is not guaranteed and may result in data corruption or timing violations.

Does the 71V632S6PFGI support true pipelined burst reads, and how does it differ from standard burst SRAMs?

Yes, the 71V632S6PFGI implements true pipelined burst reads: the first output appears on the second rising CLK edge after address presentation, followed by three more words on successive edges - achieving 3-1-1-1 timing. Unlike non-pipelined burst SRAMs, this eliminates pipeline stalls during cache line fills and aligns precisely with Pentium and PowerPC processor bus protocols.

How is burst address sequencing controlled on the 71V632S6PFGI, and what happens if the LBO pin is left unconnected?

Burst address sequencing is controlled by the LBO pin: tied to VSS for linear mode (00→01→10→11), or to VDD for interleaved mode (00→10→01→11). If left unconnected, LBO is internally pulled to VDD, defaulting to interleaved burst mode. This behavior is documented in the datasheet note on pin definitions and must be accounted for in PCB layout.

Can the 71V632S6PFGI be used in power-sensitive applications, and what is its standby current?

Yes, the 71V632S6PFGI supports low-power operation via the ZZ pin: asserting ZZ = HIGH places the device in sleep mode with typical ICC of 5 µA and maximum of 10 µA. Wake-up requires full deselection (CE/CS high) followed by reselection - no additional reset sequence is needed. This makes it suitable for battery-backed or thermally constrained industrial systems.

Is the 71V632S6PFGI pin-compatible with other members of the IDT 71V6xx family, such as the 71V656 or 71V676?

No, the 71V632S6PFGI is not pin-compatible with the 71V656 (64K × 16) or 71V676 (128K × 32), despite shared package and functional overlap. Differences in address width (A0–A15 vs. A0–A16), data bus width (32-bit vs. 16-bit), and control signal assignments prevent direct substitution. Each variant requires unique PCB layout and firmware configuration.