Renesas 709279L9PF8

Overview

709279L9PF8 from Integrated Device Technology is a high-speed 32K × 16-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from left and right ports, 9 ns clock-to-data access in pipelined mode, 15 ns cycle time at 67 MHz, and industrial temperature support (–40°C to +85°C) in a 100-pin TQFP package. It serves as shared memory buffer in real-time DSP systems requiring deterministic latency and concurrent read/write operations.

For engineers reviewing the 709279L9PF8 datasheet, 709279L9PF8 pinout, 709279L9PF8 application, or 709279L9PF8 equivalent, key selection criteria include pipelined vs. flow-through output timing modes, dual chip enable for depth expansion, separate upper/lower byte controls for bus matching, counter enable/reset functionality, and low-power standby consumption (1 mW typ.) under CE-controlled power-down.

Technical Context

The 709279L9PF8 implements fully synchronous operation on both ports with registered address, data, and control inputs-requiring only 4 ns setup and 1 ns hold relative to CLK. Its self-timed write architecture enables fast cycle times independent of clock low time, while the FT/PIPE pin selects between flow-through (no latency) and pipelined (1-cycle latency, 9 ns tCD2) output modes per port.

Dual chip enables (CE0X/CE1X) allow seamless depth expansion without external logic; counter enable (CNTENX) and reset (CNTRSTX) signals support burst-addressing applications; and separate upper-byte (UBX) and lower-byte (LBX) controls provide compatibility with multiplexed 16-bit buses and byte-level granularity during writes.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (PN100), 14 mm × 14 mm × 1.4 mm body, lead-free (Green) option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and IDT70V9279L15PF, the 709279L9PF8 uniquely combines 32K × 16-bit capacity, 9 ns pipelined access, integrated address counter, and 5 V TTL compatibility-making it optimal for high-performance, thermally constrained, and legacy-bus-compatible dual-processor systems.

Availability

709279L9PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, automotive ADAS, industrial PLC, and real-time DSP applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 709279L9PF8 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 IDT709279 family was designed specifically for high-bandwidth, low-latency shared-memory applications in dual-processor, DSP, and network processing systems-emphasizing true concurrency, deterministic timing, and robust 5 V operation.

FAQ

What is the maximum operating frequency of the 709279L9PF8 in pipelined mode?

The 709279L9PF8 achieves a 15 ns clock cycle time (tCYC2) in pipelined output mode, corresponding to a maximum operating frequency of 67 MHz. This is validated across the industrial temperature range (–40°C to +85°C) with 5.0 V ±10% supply. The 9 ns clock-to-data valid (tCD2) parameter ensures predictable read latency at this rate, making the 709279L9PF8 suitable for high-throughput inter-processor communication links.

Does the 709279L9PF8 support independent byte write masking on each port?

Yes, the 709279L9PF8 provides dedicated upper-byte (UBL/UBR) and lower-byte (LBL/LBR) select inputs for each port. When asserted low, these signals enable writes to the corresponding 8-bit segment (I/O8–I/O15 or I/O0–I/O7) while leaving the other byte unchanged. This eliminates read-modify-write cycles and supports efficient partial-word updates in mixed-data-width systems-confirmed in Truth Table I and functional description sections of the datasheet.

How does the FT/PIPE pin affect timing behavior of the 709279L9PF8?

The FT/PIPEL and FT/PIPER pins configure output latency per port: VIH selects pipelined mode (1-cycle latency, 9 ns tCD2, 15 ns tCYC2), while VIL selects flow-through mode (zero latency, 20 ns tCD1, 25 ns tCYC1). Critically, CE0X/CE1X become double-buffered in pipelined mode-requiring two clock cycles to fully deselect-whereas they remain single-buffered in flow-through mode. This behavior is explicitly defined in Note 3 of Table 1.

What is the standby power consumption of the 709279L9PF8, and how is it achieved?

The 709279L9PF8 consumes 1 mW typical standby power (ISB3) when both ports are fully deselected using CMOS-level inputs (CE0X > VCC − 0.2 V and CE1X < 0.2 V). This ultra-low quiescent power is enabled by its low-power "L" variant process and internal circuitry shutdown-distinct from the "S" variant's 5 mW standby. The datasheet confirms this value in Table 9 under ISB3 for 709279L9PF8 at TA = 25°C.

Can the 709279L9PF8 be used for depth expansion without external logic?

Yes, the 709279L9PF8 supports depth expansion using only its dual chip enables (CE0X/CE1X) per port-no external decoding logic required. As shown in Figure 4 of the datasheet, cascading multiple devices is accomplished by tying CE1 of one device to CE0 of the next, with common address and data buses. This architecture is validated for both pipelined and flow-through modes and maintains full timing compliance across expanded configurations.