Renesas 70V9279S15PRFI8

Overview

70V9279S15PRFI8 from IDT (now Renesas) is a high-speed 32K × 16-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address from left and right ports, 15 ns pipelined clock-to-data access, 10 ns cycle time at 100 MHz, and LVTTL-compatible 3.3 V ±0.3 V operation - deployed in real-time DSP inter-processor communication buffers and FPGA co-processor data exchange subsystems.

For engineers reviewing the 70V9279S15PRFI8 datasheet, 70V9279S15PRFI8 pinout, 70V9279S15PRFI8 application, or 70V9279S15PRFI8 equivalent, this page delivers verified functional identity, industrial-grade timing specs (–40°C to +85°C), TQFP-128 package mapping, flow-through/pipelined output mode control, and two validated alternative parts for depth-expansion or power-optimized designs.

Technical Context

This device implements fully synchronous dual-port architecture with independent clock, address, data, and control registers on both ports - supporting 4 ns setup / 1 ns hold timing on all inputs. It features dual chip enables (CE0/CE1) for seamless depth expansion without external logic and separate upper-byte (UB) and lower-byte (LB) controls for multiplexed bus compatibility.

The integrated address counter supports automatic address increment via CNTEN/CNTRST signals, and FT/PIPE pin selects between flow-through (tCD1 ≤ 20 ns) and pipelined (tCD2 ≤ 9 ns) output modes - with CE0/CE1 double-buffering enabled only in pipelined mode per port.

Key Specifications

Pinout & Package

70V9279S15PRFI8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package with exposed thermal pad (PKG128). All VDD pins require local 3.3 V decoupling; all VSS pins must be solidly grounded. Pin 1 is marked by corner cut or dot; orientation follows JEDEC MO-153 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C33256P-15JCIN, the 70V9279S15PRFI8 uniquely integrates address counter, dual chip enables, and per-port FT/PIPE control - reducing FPGA logic utilization and enabling tighter real-time determinism in multi-processor architectures.

Availability

70V9279S15PRFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive ADAS applications requiring stable component supply across extended product lifecycles.

Supply support for 70V9279S15PRFI8 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, specializes in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V9279S15PRFI8 belongs to IDT's high-speed synchronous dual-port SRAM product line, engineered for deterministic, low-latency inter-processor communication in real-time embedded systems with strict timing budgets.

FAQ

What is the maximum operating frequency of the 70V9279S15PRFI8 in pipelined mode?

The 70V9279S15PRFI8 supports up to 100 MHz operation in pipelined output mode, corresponding to a 10 ns clock cycle time (tCYC2 = 10 ns min). This is confirmed in Table 11a for the X7 speed grade under industrial temperature conditions. The 70V9279S15PRFI8 achieves this with 4 ns clock high/low times and full synchronous register-to-register timing.

Does the 70V9279S15PRFI8 support independent byte-write control on each port?

Yes, the 70V9279S15PRFI8 provides independent upper-byte (UB) and lower-byte (LB) select inputs on both left and right ports. When UB is asserted, I/O8–I/O15 are enabled; when LB is asserted, I/O0–I/O7 are enabled - allowing simultaneous or selective 8-bit writes without affecting the opposite byte lane. This is documented in Truth Table I and Pin Names table.

How does the address counter function on the 70V9279S15PRFI8, and what signals control it?

The 70V9279S15PRFI8 includes a per-port address counter controlled by CNTEN (enable) and CNTRST (reset) inputs. When CNTEN = low on the rising CLK edge, the internal address increments automatically. CNTRST = low forces the counter to reset to address 0 on the next clock. ADS remains high during counter operation to prevent external address loading - verified in Truth Table II and Figure 15.

What is the power consumption profile of the 70V9279S15PRFI8 in standby mode?

In full standby (ISB3), the 70V9279S15PRFI8 draws just 0.4 mA typical (1.32 mW at 3.3 V) when both ports are disabled with CMOS-level inputs. This is specified in Table 9a for the 'L' power variant under commercial temperature. Standby current rises to 65 mA (ISB1) under TTL-level disable conditions - confirming aggressive power gating per port.

Can the 70V9279S15PRFI8 be used in depth-expanded configurations, and how is that implemented?

Yes, the 70V9279S15PRFI8 supports depth expansion using its dual chip enable (CE0/CE1) architecture. By tying CE0 of one device to CE1 of the next and cascading address lines, multiple 70V9279S15PRFI8 units can be stacked to increase memory depth without external decode logic - explicitly stated in the Features section and Truth Table I.