Renesas 70V9279S7PRFI

Overview

70V9279S7PRFI from IDT (now part of Renesas) is a high-speed 32K × 16-bit synchronous dual-port SRAM with true dual-ported memory cells enabling simultaneous read/write access to the same address from left and right ports, 10 ns pipelined cycle time at 100 MHz, LVTTL-compatible 3.3 V ±0.3 V operation, and industrial temperature range (–40°C to +85°C). It serves as on-chip buffer memory in real-time digital signal processors and FPGA-based communication controllers.

For engineers reviewing the 70V9279S7PRFI datasheet, 70V9279S7PRFI pinout, 70V9279S7PRFI application, or 70V9279S7PRFI equivalent, key selection considerations include pipelined vs. flow-through output mode timing, port-to-port delay (tCWDD ≤ 35 ns), dual chip enable depth expansion capability, counter-enabled burst addressing, and TQFP-128 package thermal and layout constraints.

Technical Context

This device implements fully synchronous dual-port architecture with independent clock inputs (CLKL/CLKR), separate address/data/control registers per port, and self-timed write logic enabling minimal cycle time. Each port supports programmable output mode (flow-through or pipelined) via FT/PIPE pin, with pipelined mode delivering 6.5 ns clock-to-data-out and 10 ns cycle time.

It integrates address strobe (ADSL/ADSR), counter enable/reset (CNTENL/CNTRSTL, CNTENR/CNTRSTR), and byte-select controls (UBL/LBL, UBR/LBR) for multiplexed bus compatibility. Power management includes four standby current modes (ISB1–ISB4), with full CMOS-level standby drawing only 0.4 mA typical.

Key Specifications

Pinout & Package

70V9279S7PRFI is housed in a 128-pin Thin Quad Flatpack (TQFP) package, body size 14 mm × 20 mm × 1.4 mm, with 0.4 mm lead pitch and exposed thermal pad (not electrically connected). All VDD pins require local 3.3 V decoupling; all VSS pins must be solidly grounded.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C1371BV33-100AXC and AS7C33256PFS-10BIN, the 70V9279S7PRFI uniquely combines industrial temperature rating, integrated address counter, dual-mode output timing, and TQFP-128 footprint - making it the only option supporting synchronized burst streaming in harsh-environment real-time systems.

Availability

70V9279S7PRFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and embedded vision applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 70V9279S7PRFI 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, and interface solutions for communications, computing, and industrial markets.

The 70V9279S7PRFI belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for real-time embedded systems requiring deterministic, low-latency, and concurrent memory access across independent clock domains.

FAQ

What is the maximum operating frequency of the 70V9279S7PRFI in pipelined mode?

The 70V9279S7PRFI supports up to 100 MHz operation in pipelined output mode, corresponding to a 10 ns clock cycle time (tCYC2). This is guaranteed over the full industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply, with all AC timing parameters validated per datasheet Table 11a for the 70V9279/69X7 speed grade.

Does the 70V9279S7PRFI support simultaneous read and write to the same memory address?

Yes, the 70V9279S7PRFI uses true dual-ported memory cells that allow simultaneous read from one port and write to the same address on the other port. This capability is fundamental to its architecture and is explicitly confirmed in the Functional Block Diagram and Description sections of the datasheet.

How does the address counter function in the 70V9279S7PRFI, and what signals control it?

The 70V9279S7PRFI includes an autonomous 15-bit address counter per port, controlled by CNTENL/CNTENR (enable) and CNTRSTL/CNTRSTR (reset) inputs. When CNTENX = VIL on the rising edge of CLKX, the counter advances regardless of CE, UB/LB, or OE state - enabling burst sequential access without host address updates.

What is the purpose of the dual chip enable (CE0/CE1) configuration on the 70V9279S7PRFI?

The dual chip enable (CE0X and CE1X) configuration on the 70V9279S7PRFI enables depth expansion across multiple devices without external logic. Selection requires CE0X = VIL and CE1X = VIH; CE0X = VIH or CE1X = VIL places the port in power-down mode. This architecture simplifies memory bank design in systems requiring >32K × 16 capacity.

Is the 70V9279S7PRFI pin-compatible with other members of the IDT70V92xx family?

No, the 70V9279S7PRFI is not universally pin-compatible across the IDT70V92xx family. While it shares the 128-pin TQFP package with variants like 70V9269, pin functions differ - notably A14 is functional on 70V9279 (supporting 32K) but NC on 70V9269 (16K). Always verify pin mapping against the specific variant's datasheet before substitution.