Renesas 71T75902S75PFGI

Overview

71T75902S75PFGI from IDT (now Renesas) is a 2.5V synchronous ZBT™ SRAM with 1M × 18-bit organization (18,874,368 bits), 100 MHz operation (7.5 ns clock-to-data access), flow-through outputs, and integrated burst counter. It supports zero bus turnaround between read/write cycles and operates across industrial temperature range (–40°C to +85°C) in a 100-pin TQFP package - used in high-speed packet buffering and network switch data planes.

For engineers reviewing the 71T75902S75PFGI datasheet, 71T75902S75PFGI pinout, 71T75902S75PFGI application, or 71T75902S75PFGI equivalent, key selection considerations include its synchronous ZBT architecture, 4-word burst capability (linear/interleaved), individual byte write control (BW1/BW2), JTAG IEEE 1149.1 compliance, and dual 2.5V supply (VDD/VDDQ) requirements.

Technical Context

The 71T75902S75PFGI implements a synchronous, clock-driven interface with all address/control inputs registered on the rising edge of CLK (except asynchronous OE). Its ZBT architecture eliminates dead cycles via internal burst counter and ADV/LD-controlled address loading or incrementing - enabling seamless back-to-back reads/writes without bus idle time.

It features three chip enables (CE1, CE2 active-low; CE2 active-high) for flexible depth expansion, flow-through output path (no output register), and full JTAG boundary-scan support (TMS/TDI/TCK/TDO/TRST). Sleep mode (ZZ input) reduces current to ≤60 mA in full standby while guaranteeing data retention.

Key Specifications

Pinout & Package

71T75902S75PFGI is packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, with 0.5 mm pitch. Pinout validated per IDT datasheet 5319 (Rev. Apr.07.20), PKG100 configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1301DV33-100AXC and AS7C31026B-10JIN, the 71T75902S75PFGI uniquely delivers industrial-temperature ZBT operation with JTAG and true flow-through outputs - making it optimal for telecom infrastructure where timing determinism, testability, and thermal resilience are non-negotiable.

Availability

71T75902S75PFGI is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, industrial PLC data exchange, high-speed test equipment memory, and embedded real-time control systems requiring stable component supply across extended temperature ranges.

Supply support for 71T75902S75PFGI 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance timing, memory interface, and RF solutions for communications and computing infrastructure.

The 71T75902S75PFGI belongs to IDT's ZBT SRAM product line, engineered specifically for zero-latency, high-throughput data buffering in networking ASICs, switches, and routers - emphasizing deterministic timing, burst efficiency, and industrial reliability.

FAQ

What is the maximum operating frequency of the 71T75902S75PFGI?

The 71T75902S75PFGI supports a maximum clock frequency of 100 MHz, corresponding to a minimum clock cycle time (tCYC) of 10 ns. This is validated across the industrial temperature range (–40°C to +85°C) with VDD and VDDQ at 2.5 V ±5%. The 7.5 ns clock-to-data access (tCD) ensures tight timing margins for high-speed interfaces.

Does the 71T75902S75PFGI support burst read and write operations?

Yes, the 71T75902S75PFGI supports 4-word burst operations for both reads and writes using its internal synchronous burst counter. The LBO pin selects between linear and interleaved burst sequences, and the ADV/LD signal controls whether a new external address is loaded (LOW) or the counter is incremented (HIGH).

What is the function of the ZZ pin on the 71T75902S75PFGI?

The ZZ pin on the 71T75902S75PFGI is the synchronous sleep mode input. When driven HIGH, it gates the internal clock and places the device into full sleep mode with supply current reduced to ≤60 mA (IZZ), while guaranteeing data retention. ZZ has an internal pulldown resistor and is sampled synchronously on the rising edge of CLK.

How does the 71T75902S75PFGI achieve zero bus turnaround (ZBT)?

The 71T75902S75PFGI achieves ZBT through its synchronous architecture with registered address/control inputs, flow-through outputs, and a dedicated burst counter. By allowing immediate transition from write to read (or vice versa) within a single clock cycle - without bus idle time - it eliminates dead cycles inherent in traditional pipelined SRAMs.

Is JTAG boundary scan supported on the 71T75902S75PFGI?

Yes, the 71T75902S75PFGI includes full IEEE 1149.1-compliant JTAG boundary-scan functionality with TMS, TDI, TCK, TDO, and optional TRST pins. This enables in-system test, interconnect verification, and debug without requiring physical probe access - critical for high-density telecom PCBs.