Renesas 709079S15PF8

Overview

709079S15PF8 from Integrated Device Technology is a 32K × 8-bit synchronous dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address from left and right ports, 15 ns clock-to-data access (pipelined mode), 25 ns cycle time, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It serves in real-time interprocessor communication and high-speed buffer applications requiring deterministic latency.

For engineers reviewing the 709079S15PF8 datasheet, 709079S15PF8 pinout, 709079S15PF8 application, or 709079S15PF8 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 counter-enable/reset support for burst-addressing control in DSP or FPGA co-processor systems.

Technical Context

This device implements fully synchronous operation on both ports with registered address, data, and control inputs-ensuring 4 ns setup and 1 ns hold times relative to CLK. Its self-timed write mechanism enables fast cycle time independent of clock low time, while the address counter (CNTEN/CNTRST) supports automatic sequential addressing across bursts.

The dual-port architecture uses dedicated left/right I/O buses (I/O0L–I/O7L / I/O0R–I/O7R), separate clocks (CLKL/CLKR), and independent chip enables (CE0L/CE1L and CE0R/CE1R), allowing concurrent read/write operations across ports with port-to-port delay as low as 50 ns in flow-through mode.

Key Specifications

Pinout & Package

709079S15PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP, PN100) with exposed thermal pad (not electrically connected), 0.5 mm pitch, and pin 1 marked by corner dot. All VCC pins require local 0.1 µF decoupling; all GND pins must be tied to solid ground plane.

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 IDT70V9079S15PF8, the 709079S15PF8 uniquely delivers 5 V operation with integrated address counter and dual CE architecture - making it optimal for industrial 5 V systems requiring burst-mode buffering without external logic.

Availability

709079S15PF8 is available at Aetrix Electronics and suitable for industrial motion control, telecom packet buffering, real-time interprocessor communication, and FPGA-DSP co-processing applications requiring stable component supply across extended product lifecycles.

Supply support for 709079S15PF8 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, and RF power solutions for communications, computing, and industrial markets.

The IDT7090xx family was designed specifically for deterministic, low-latency shared-memory architectures in real-time embedded systems - emphasizing simultaneous dual-port access, synchronous timing control, and industrial-grade reliability.

FAQ

What is the maximum operating frequency of the 709079S15PF8 in pipelined mode?

The 709079S15PF8 supports a maximum clock frequency of 40 MHz in pipelined output mode, derived from its 25 ns clock cycle time (tCYC2). This is confirmed in Table 11 of the datasheet under "709089/79X15 Commercial Only" column. The device achieves this timing with 10 ns minimum clock high/low times and requires proper termination and layout to maintain signal integrity at full speed.

Does the 709079S15PF8 support independent power-down per port?

Yes, the 709079S15PF8 supports independent port power-down: asserting CE0 = VIH or CE1 = VIL for one clock cycle disables that port's internal circuitry, reducing standby current to 5 mW typ. per port. This is documented in the Features section and DC Electrical Characteristics Table 9, where ISB2 and ISB4 values confirm per-port low-power states.

Is A15 used as an address pin on the 709079S15PF8?

No, A15 is not used on the 709079S15PF8. Per Note 1 in the Pin Configuration diagram and Truth Table 1, A15X is designated "NC for IDT709079", confirming it is a no-connect pin. The device implements only a 32K × 8-bit (2¹⁵ = 32,768) address space, requiring only A0–A14 - consistent with its 709079 device type designation.

Can the left and right ports of the 709079S15PF8 operate at different clock frequencies?

Yes, the left and right ports of the 709079S15PF8 operate independently with separate clocks (CLKL and CLKR), allowing asynchronous or different-frequency operation. The Functional Description (page 15) states "All internal registers are clocked on the rising edge of the clock signal" per port, and timing parameters in Table 11 are specified per port without cross-port synchronization constraints.

What is the purpose of the ADS pin on the 709079S15PF8?

The ADS (Address Strobe) pin on the 709079S15PF8 loads the external address present on A0–A14 into the internal address latch on the next rising clock edge - overriding the internal address counter when asserted (VIL). As defined in Truth Table II and Figure 15, ADS enables external address control during burst sequences, ensuring deterministic address capture independent of counter state.