Renesas 70V9079L7PFG8

Overview

70V9079L7PFG8 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, 12ns max clock-to-data access in industrial temperature range (−40°C to +85°C), LVTTL-compatible 3.3V ±0.3V supply, and pipelined or flow-through output mode selection via FT/PIPE pin - used in real-time DSP inter-processor communication buffers and FPGA-based protocol bridging systems.

For engineers reviewing the 70V9079L7PFG8 datasheet, 70V9079L7PFG8 pinout, 70V9079L7PFG8 application, or 70V9079L7PFG8 equivalent, key selection criteria include guaranteed industrial-temp operation, dual-port synchronous timing compliance (tCYC2 ≤ 20ns pipelined), on-chip address counter with CNTEN/CNTRST control, depth-expansion support via dual CE0/CE1 enables, and TQFP-100 package compatibility with legacy IDT dual-port SRAM layouts.

Technical Context

This device implements fully synchronous dual-port architecture with independent clock inputs (CLKL/CLKR), registered address/data/control inputs, and self-timed write logic decoupled from clock edge timing. Each port features dedicated address strobe (ADSL/ADSR), counter enable (CNTENL/CNTENR), and reset (CNTRSTL/CNTRSTR) signals for autonomous burst addressing.

It supports two distinct output modes: flow-through (FT/PIPE = VIL, tCD1 ≤ 25ns) and pipelined (FT/PIPE = VIH, tCD2 ≤ 12ns), with separate CE0/CE1 enables per port enabling selective power-down of inactive ports. A15X is no-connect for 70V9079L, confirming its 32K × 8 (15-bit address) configuration versus 64K × 8 variants.

Key Specifications

Pinout & Package

70V9079L7PFG8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with exposed thermal pad, body dimensions 14mm × 14mm × 1.4mm. All VDD pins must be connected to 3.3V supply; all VSS pins to ground. A15R and A15L are no-connect (NC) pins, confirming the 32K address space.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C33256PFSIG, the 70V9079L7PFG8 uniquely delivers industrial temperature operation, on-chip address counter, and selectable pipelined/flow-through output modes - making it the sole option for deterministic-latency, burst-capable dual-port buffering in harsh environments.

Availability

70V9079L7PFG8 is available at Aetrix Electronics and suitable for real-time DSP inter-processor buffers, FPGA-based protocol bridges, and industrial motion controllers requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V9079L7PFG8 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 70V9079L7PFG8 belongs to IDT's synchronous dual-port SRAM product line, designed specifically for deterministic-latency, high-bandwidth inter-processor communication in real-time embedded systems where concurrent access and precise timing control are critical.

FAQ

What is the maximum operating frequency of the 70V9079L7PFG8 in pipelined mode?

The 70V9079L7PFG8 supports up to 50MHz operation in pipelined output mode, derived from its 20ns maximum clock cycle time (tCYC2). This is validated across the full industrial temperature range (−40°C to +85°C) with 3.3V ±0.3V supply. The device achieves this using registered outputs and self-timed write logic, ensuring timing predictability without external wait-state insertion. The 70V9079L7PFG8 maintains this frequency under worst-case voltage and temperature conditions as specified in Table 11b of the datasheet.

Does the 70V9079L7PFG8 support depth expansion without external logic?

Yes, the 70V9079L7PFG8 supports depth expansion without external logic via its dual chip enable inputs (CE0L/CE1L and CE0R/CE1R) per port. As shown in Figure 4 of the datasheet, cascading multiple devices requires only routing A15 (or higher) address bits to CE inputs - eliminating external decoders. This capability is confirmed for both commercial and industrial versions and applies identically to the 70V9079L7PFG8, which uses A15 as NC to denote its 32K configuration while retaining full CE-based expansion control.

What is the function of the FT/PIPE pin on the 70V9079L7PFG8?

The FT/PIPE pin on the 70V9079L7PFG8 selects between two output timing architectures: when driven low (VIL), it configures flow-through mode with combinatorial output (tCD1 ≤ 25ns); when high (VIH), it enables pipelined mode with registered output (tCD2 ≤ 12ns). Critically, this setting is per-port - FT/PIPEL controls the left port, FT/PIPER the right port - allowing asymmetric timing configurations. The pin must remain stable during operation as it is treated as a DC control signal, not a dynamic input.

How does the address counter in the 70V9079L7PFG8 operate?

The 70V9079L7PFG8 integrates independent address counters on each port, controlled by CNTENL/CNTENR (enable) and CNTRSTL/CNTRSTR (reset) inputs. When CNTEN = VIL on the rising clock edge, the counter advances regardless of CE state, generating the next sequential address. Reset forces the counter to A0. This functionality is confirmed in Truth Table II and Figures 15–17, and operates identically on both ports. For the 70V9079L7PFG8, the counter spans the full 32K address space (0x0000–0x7FFF) since A15 is NC.

Is the 70V9079L7PFG8 pin-compatible with other IDT dual-port SRAMs?

The 70V9079L7PFG8 is pin-compatible with the IDT70V9089/79 family in the 100-pin TQFP package, including 70V9089L7PFG8. Key compatibility markers are identical pin count, matching power/ground distribution, and shared signal naming (e.g., CLKL/CLKR, ADSL/ADSR, CNTENL/CNTENR). However, A15R/A15L are NC on 70V9079L7PFG8 (32K) versus functional on 70V9089L7PFG8 (64K), requiring minor address decoding adjustments. No PCB redesign is needed for drop-in replacement in 32K-configured systems.