Renesas 70V9079L15PF

Overview

70V9079L15PF from IDT (now Renesas) is a high-speed 32K × 8-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, 15 ns clock-to-data access in pipelined mode, LVTTL-compatible 3.3 V ±0.3 V operation, and integrated address counter with reset/enable-used in real-time DSP co-processing buffers and FPGA-based communication protocol accelerators.

For engineers reviewing the 70V9079L15PF datasheet, 70V9079L15PF pinout, 70V9079L15PF application, or 70V9079L15PF equivalent, key selection criteria include pipelined vs. flow-through output timing, dual-port depth expansion capability via CE0/CE1 control, industrial temperature support (–40°C to +85°C), and low-power standby current of 0.4 mA (typ.) under CMOS-level inputs.

Technical Context

This device implements fully synchronous dual-port architecture with independent clocked registers on all address, data, and control inputs (4 ns setup / 1 ns hold), self-timed internal write pulse decoupled from clock edge, and asynchronous OE for flexible bus interfacing. The address counter advances on rising CLK when CNTEN = L, independent of chip enable states.

It supports two configurable output modes: pipelined (FT/PIPE = H, tCD2 = 9 ns max, tCYC2 = 25 ns min) and flow-through (FT/PIPE = L, tCD1 = 20 ns max, tCYC1 = 35 ns min), with port-to-port delay tCWDD ≤ 50 ns and clock-to-clock setup tCCS ≥ 20 ns for inter-port synchronization in shared-memory systems.

Key Specifications

Pinout & Package

100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm; all VDD pins require local 3.3 V decoupling, all VSS pins must connect to 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 AS7C33256P-15JCIN, the 70V9079L15PF uniquely delivers integrated address counter, dual-mode output timing (pipelined/flow-through), and guaranteed industrial temperature operation - making it optimal for resource-constrained, latency-sensitive embedded systems requiring deterministic dual-port behavior.

Availability

70V9079L15PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, FPGA acceleration, and DSP co-processing applications requiring stable component supply across extended product lifecycles.

Supply support for 70V9079L15PF 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V9079L15PF belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for real-time embedded systems requiring zero-wait-state shared memory between heterogeneous processors or logic blocks.

FAQ

What is the maximum operating frequency of the 70V9079L15PF in pipelined output mode?

The 70V9079L15PF supports up to 40 MHz operation in pipelined mode, derived from its minimum clock cycle time (tCYC2) of 25 ns as specified in the industrial-grade AC characteristics table. This timing is valid across the full –40°C to +85°C temperature range with 3.3 V ±0.3 V supply, and applies when FT/PIPE = VIH on the active port. The 70V9079L15PF achieves this performance through registered inputs and self-timed write circuitry.

Does the 70V9079L15PF support depth expansion without external logic?

Yes, the 70V9079L15PF supports seamless depth expansion using its dual chip enable pins (CE0L/CE1L and CE0R/CE1R) per port. By tying CE0 of one device to CE1 of the next, and decoding higher-order address bits to select CE0/CE1 pairs, multiple 70V9079L15PF units can be stacked to increase memory depth - no external gate logic is required, as confirmed in the Functional Description and Figure 4 of the datasheet.

What is the function of the ADS pin on the 70V9079L15PF?

The ADS (Address Strobe) pin on the 70V9079L15PF controls whether the internal address register loads the external address bus (ADS = L) or increments the on-chip address counter (ADS = H). When ADS = L, the rising edge of CLK captures A0–A14; when ADS = H and CNTEN = L, the counter advances automatically. This dual-mode addressing is explicitly defined in Truth Table II and Timing Waveforms 14–17 of the 70V9079L15PF datasheet.

Can the left and right ports of the 70V9079L15PF operate at different clock frequencies?

Yes, the 70V9079L15PF allows independent clocking of the left (CLKL) and right (CLKR) ports at different frequencies, as both ports feature fully separate synchronous register sets. The datasheet confirms full independence in the "Full synchronous operation on both ports" feature and specifies timing parameters separately per port (e.g., tSA, tCD1, tCD2). This enables use cases such as bridging a 50 MHz DSP bus to a 25 MHz microcontroller bus without clock domain synchronization logic.

Is the 70V9079L15PF RoHS-compliant and halogen-free?

Yes, the 70V9079L15PF is RoHS-compliant and halogen-free, as stated in the "Green parts available" feature line and ordering information section of the official IDT datasheet (DSC 3750/14, September 2019). The "L" suffix in the part number denotes the lead-free, green packaging variant, and the 100-pin TQFP package meets JEDEC J-STD-609A Class 1 requirements for bromine and chlorine content.