Renesas 709079S15PFI8

Overview

709079S15PFI8 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, and industrial temperature range (–40°C to +85°C). It operates on a single 5V ±10% supply and supports flow-through or pipelined output modes via FT/PIPE pin for high-speed data buffering in real-time interprocessor communication systems.

For engineers reviewing the 709079S15PFI8 datasheet, 709079S15PFI8 pinout, 709079S15PFI8 application, or 709079S15PFI8 equivalent, key selection criteria include pipelined vs. flow-through timing behavior, dual chip enable support for depth expansion, counter-enable/reset functionality for burst addressing, and TTL-compatible 5V operation with low standby power (1 mA typ.) in industrial environments.

Technical Context

The 709079S15PFI8 implements full synchronous operation on both ports with 4 ns setup and 1 ns hold times for all control, address, and data inputs. Its internal architecture includes dedicated address/data/control registers per port, self-timed write logic, and independent address strobe (ADS) and counter control (CNTEN/CNTRST) signals enabling external address loading or automatic incrementing without CPU intervention.

It supports two distinct output modes: flow-through (tCD1 = 30 ns max) and pipelined (tCD2 = 15 ns max), selected per port via FT/PIPEL and FT/PIPER pins. The device features dual chip enables (CE0/CE1) per port for seamless depth expansion and automatic power-down when either CE0 = VIH or CE1 = VIL, reducing active current to 190 mA (typ.) and full standby current to 0.2 mA (typ.) at 5V.

Key Specifications

Pinout & Package

709079S15PFI8 is housed in a 100-pin Thin Quad Flatpack (TQFP) package (PN100), with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. All VCC and GND pins must be connected per datasheet requirements; A15L and A15R are no-connects for this 32K variant.

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 IDT70V9089S15PFI, the 709079S15PFI8 uniquely balances 32K depth, 5V simplicity, per-port output mode control, and industrial qualification-making it optimal for cost-sensitive, space-constrained dual-CPU designs where pin compatibility and minimal BOM change are essential.

Availability

709079S15PFI8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, industrial PLC data exchange, and telecom packet buffering requiring stable component supply across extended product lifecycles.

Supply support for 709079S15PFI8 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.

The IDT7090xx family was designed specifically for high-reliability, synchronous dual-access memory applications in telecommunications, industrial automation, and military/aerospace systems demanding deterministic latency and robust temperature performance.

FAQ

What is the maximum operating frequency of the 709079S15PFI8 in pipelined mode?

The 709079S15PFI8 achieves a 25 ns clock cycle time in pipelined output mode, supporting up to 40 MHz operation. This is confirmed by AC Electrical Characteristics Table 11 (tCYC2 = 25 ns max for X15 speed grade) and applies when FT/PIPE = VIH on the active port. The device maintains full functionality-including dual-port concurrency and counter operations-at this rate under industrial temperature conditions.

Does the 709079S15PFI8 support independent output mode selection per port?

Yes, the 709079S15PFI8 supports independent flow-through or pipelined output mode on each port via dedicated FT/PIPEL (left) and FT/PIPER (right) pins. When FT/PIPEL = VIL and FT/PIPER = VIH, the left port operates in flow-through mode (tCD1 = 30 ns max) while the right port runs in pipelined mode (tCD2 = 15 ns max), enabling mixed-latency system architectures.

What is the function of the ADS pin on the 709079S15PFI8, and how does it interact with the address counter?

The ADS (Address Strobe) pin on the 709079S15PFI8 loads the external address presented on A0–A14 into the port's address register on the rising edge of CLK. When ADS = VIH, the internal address counter (enabled by CNTEN = VIL) increments automatically; when ADS = VIL, the external address overrides the counter. This dual-mode addressing is documented in Truth Table II and Figure 15 of the datasheet.

Is A15 used as an address line on the 709079S15PFI8?

No, A15 is a no-connect (NC) for the 709079S15PFI8. As explicitly stated in multiple datasheet notes ("A15X is a NC for IDT709079"), this device implements a 32K × 8-bit organization requiring only 15 address bits (A0–A14). A15L and A15R pins are unconnected internally and must be left floating or tied to ground per PCB design best practices.

How does the 709079S15PFI8 achieve low standby power, and what is the typical current draw?

The 709079S15PFI8 achieves low standby power through dual chip enable logic: asserting CE0 = VIH or CE1 = VIL disables the internal circuitry of the corresponding port. In full standby (both ports disabled with CMOS-level inputs), ISB3 = 0.2 mA typical at 5V, as specified in Table 9. This enables energy-efficient operation in battery-backed or thermally constrained industrial systems without data loss.