Renesas 709279L15PFI

Overview

709279L15PFI from Integrated Device Technology 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, 15ns pipelined clock-to-data access (max), 25ns flow-through cycle time, and industrial temperature support (–40°C to +85°C). It serves as on-chip buffer or inter-processor communication memory in real-time DSP systems requiring deterministic latency.

For engineers reviewing the 709279L15PFI datasheet, 709279L15PFI pinout, 709279L15PFI application, or 709279L15PFI equivalent, key selection criteria include pipelined vs. flow-through output mode configuration via FT/PIPE pin, dual chip enable architecture for depth expansion without external logic, and TTL-compatible 5V ±10% single-supply operation with low standby power (1mW typ).

Technical Context

The 709279L15PFI implements fully synchronous operation on both ports with 4ns setup / 1ns hold timing on all control, address, and data inputs, using internal registers clocked on the rising edge of CLKL/CLKR. Its self-timed write mechanism enables fast 15ns cycle time in pipelined mode at 67MHz operation.

It supports independent byte controls (UBL/LBL and UBR/LBR) for multiplexed bus compatibility, address counter with CNTEN/CNTRST for burst addressing, and asynchronous OE for flexible bus interfacing. The FT/PIPE pin selects between flow-through (data appears one cycle after address) and pipelined (data appears two cycles after address) output modes per port.

Key Specifications

Pinout & Package

709279L15PFI is housed in a 100-pin Thin Quad Flatpack (TQFP) package, body size 14mm × 14mm × 1.4mm, lead finish SnPb (obsolete) or green RoHS-compliant variant. All VCC and GND pins must be connected per datasheet layout rules to ensure signal integrity and thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 709279L15PFI, CY7C1362BV33-166AXC demands full system voltage redesign and offers less capacity, whereas IDT70V9279L15PFIG delivers identical performance with updated environmental compliance - making it the recommended upgrade path for production continuity.

Availability

709279L15PFI is available at Aetrix Electronics and suitable for real-time digital signal processing, inter-processor communication buffers, and high-speed data acquisition front-ends requiring stable component supply across extended industrial lifecycles.

Supply support for 709279L15PFI 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.

The IDT709279 family was designed specifically for deterministic, low-latency inter-processor and DSP subsystem memory buffering - emphasizing simultaneous access, configurable timing modes, and industrial-grade reliability in 5V systems.

FAQ

What is the maximum operating frequency of the 709279L15PFI in pipelined mode?

The 709279L15PFI supports up to 67MHz operation in pipelined output mode, derived from its 15ns maximum clock-to-data valid time (tCD2) and 20ns minimum clock cycle time (tCYC2). This frequency assumes proper signal integrity, 5V ±10% supply, and industrial temperature conditions (–40°C to +85°C). The 709279L15PFI achieves this rate without external PLLs or clock doublers due to its self-timed write architecture.

Does the 709279L15PFI support independent byte write operations?

Yes, the 709279L15PFI supports independent upper- and lower-byte writes via dedicated UBL/LBL (left port) and UBR/LBR (right port) control signals. When UBL = L and LBL = H, only the lower byte (I/O0L–I/O7L) is written; when UBL = H and LBL = L, only the upper byte (I/O8L–I/O15L) is written. This capability is confirmed in Truth Table I and enables efficient 8-bit peripheral interfacing without data masking overhead in the 709279L15PFI.

How does the address counter function in the 709279L15PFI, and what controls it?

The 709279L15PFI includes a synchronous 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 from An to An+1 regardless of CE or OE state. A low pulse on CNTRSTX resets the counter to address 0. This feature is documented in Truth Table II and Figure 3243 tbl 03, enabling automatic burst addressing in the 709279L15PFI without external increment logic.

Can the left and right ports of the 709279L15PFI operate at different output modes simultaneously?

Yes, the 709279L15PFI allows independent configuration of flow-through or pipelined output mode on each port via separate FT/PIPEL (left) and FT/PIPER (right) pins. When FT/PIPEL = VIL and FT/PIPER = VIH, the left port operates in flow-through mode (0-cycle latency) while the right port uses pipelined mode (1-cycle latency). This flexibility is explicitly stated in AC Electrical Characteristics Note 2 and enables asymmetric timing optimization in heterogeneous system architectures using the 709279L15PFI.

What is the standby power consumption of the 709279L15PFI, and how is it achieved?

The 709279L15PFI achieves 1mW typical standby power (ISB3) by fully deselecting both ports - setting CE0X > VCC − 0.2V and CE1X < 0.2V per port while holding all inputs at CMOS thresholds. This places internal circuitry in deep sleep, verified in DC Electrical Characteristics Table 3243 tbl 09. The 709279L15PFI's low standby current is a key differentiator from standard SRAMs and supports energy-sensitive industrial applications where power cycling is impractical.