Renesas 709289L9PFI

Overview

IDT709289L9PFI from Integrated Device Technology is a high-speed 64K × 16-bit synchronous pipelined dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from both ports, 9 ns max clock-to-data access in pipelined mode, industrial temperature range (–40°C to +85°C), and TTL-compatible 5 V ±10% supply - deployed in real-time DSP co-processing and FPGA-based communication protocol bridging.

For engineers reviewing the IDT709289L9PFI datasheet, IDT709289L9PFI pinout, IDT709289L9PFI application, or IDT709289L9PFI equivalent, key selection criteria include pipelined vs. flow-through output timing, dual-chip-enable depth expansion capability, counter-enabled burst addressing, separate upper/lower byte controls for bus matching, and industrial-grade reliability under concurrent read/write operation.

Technical Context

The IDT709289L9PFI implements fully synchronous dual-port architecture with registered address, data, and control inputs on both left and right ports, all clocked on the rising edge of CLKL/CLKR. It supports two distinct output modes-flow-through (FT/PIPE = VIL) and pipelined (FT/PIPE = VIH)-with independent configuration per port via FT/PIPEL and FT/PIPER pins.

Each port features dedicated address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and counter reset (CNTRSTL/CNTRSTR) signals enabling automatic address incrementing without external logic. Dual chip enables (CE0/CE1 per port) allow seamless depth expansion, while separate UBL/UBR and LBL/LBR controls support multiplexed 16-bit bus interfacing with byte-level granularity.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), 14 mm × 14 mm × 1.4 mm body, lead-free and RoHS-compliant (Green part).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-100BZXI and AS7C362000B-10JIN, the IDT709289L9PFI uniquely combines industrial temperature rating, pipelined 83 MHz operation, hardware address counters, and dual chip enables - making it the only option for deterministic, low-overhead dual-processor memory sharing in harsh environments.

Availability

IDT709289L9PFI is available at Aetrix Electronics and suitable for real-time DSP co-processing, FPGA-based protocol bridging, motor drive control loop buffering, and base station channel processing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for IDT709289L9PFI 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 sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT709289L9PFI belongs to IDT's high-performance synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between heterogeneous processors, FPGAs, and ASICs in real-time embedded systems.

FAQ

What is the maximum operating frequency of the IDT709289L9PFI in pipelined mode?

The IDT709289L9PFI supports up to 83 MHz operation in pipelined output mode, corresponding to a minimum clock cycle time of 12 ns (tCYC2). This is validated across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply. The 9 ns maximum clock-to-data access time (tCD2) ensures predictable timing for high-throughput burst transfers in applications like DSP co-processing and FPGA buffering.

Does the IDT709289L9PFI support independent output modes on left and right ports?

Yes, the IDT709289L9PFI supports independent output mode selection per port via dedicated FT/PIPEL (left) and FT/PIPER (right) pins. Setting FT/PIPEL = VIH configures the left port for pipelined operation (7.5 ns clock-to-data, 12 ns cycle), while FT/PIPER = VIL sets the right port to flow-through mode (18 ns clock-to-data, 22 ns cycle). This enables mixed-timing system integration, such as connecting a fast FPGA to a slower microcontroller over shared memory.

How does the address counter function in the IDT709289L9PFI, and what signals control it?

The IDT709289L9PFI integrates a hardware address counter per port, controlled by CNTENL/CNTENR and CNTRSTL/CNTRSTR. When CNTEN = VIL on the rising edge of CLK, the internal address increments automatically. ADS = VIL loads an external address into the counter, overriding auto-increment. This eliminates host CPU overhead in DMA or burst transfer scenarios - for example, enabling continuous 64-word FFT buffer fills with a single setup command.

What is the purpose of dual chip enables (CE0 and CE1) on each port of the IDT709289L9PFI?

The dual chip enables (CE0X and CE1X, where X = L/R) on each port of the IDT709289L9PFI enable seamless depth expansion without external logic. Per Truth Table I, CE0X = VIL and CE1X = VIH activates the port; CE0X = VIH or CE1X = VIL places it in power-down mode. This allows stacking multiple IDT709289L9PFI devices - e.g., four units yield 256K × 16 - using only decoded higher-order address bits to drive CE pairs, reducing board complexity in large memory subsystems.

Is the IDT709289L9PFI pin-compatible with other speed grades in the same family?

Yes, the IDT709289L9PFI is pin-compatible with other speed variants in the IDT709289L family (e.g., IDT709289L7PFI and IDT709289L12PFI), all housed in the same 100-pin TQFP package. Electrical characteristics differ only in AC timing parameters (e.g., tCD2 = 7.5 ns max for -7, 9 ns max for -9, 12 ns max for -12), while DC specs, pin functions, and thermal ratings remain identical - enabling drop-in timing upgrades or derating for cost optimization without PCB redesign.