Renesas 7005L20PFGI

Overview

7005L20PFGI from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 20 ns max read cycle time (tRC), 1 mW typical standby power, and industrial temperature range (–40°C to +85°C). It integrates on-chip semaphore logic, interrupt flags, and BUSY arbitration for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7005L20PFGI datasheet, 7005L20PFGI pinout, 7005L20PFGI application, or 7005L20PFGI equivalent, this device supports simultaneous asynchronous access, master/slave cascading for 16-bit+ data width, battery-backed data retention at 2 V, and full hardware semaphore signaling - critical for deterministic multi-CPU memory sharing.

Technical Context

The 7005L20PFGI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port (A0L–A12L/I/O0L–I/O7L and A0R–A12R/I/O0R–I/O7R), enabling concurrent read/write operations without external logic. Its on-chip arbitration uses push-pull BUSY outputs (M/S = H) or BUSY inputs (M/S = L) to resolve port contention at the memory-cell level.

It supports two distinct memory access modes: RAM mode (CE = VIL, SEM = VIH) and semaphore mode (CE = VIH, SEM = VIL), with dedicated timing parameters (e.g., tSAA ≤ 20 ns, tSOP = 10 ns) and eight addressable semaphore flags (A0–A2). The device operates from a single 5.0 V ±10% supply and retains data down to 2 V in low-power mode.

Key Specifications

Pinout & Package

64-pin TQFP package (PNG64), RoHS-compliant, with 4 ground pins (pins 3, 4, 22, 34), 4 VCC pins (pins 8, 27, 46, 64), and dual-port signal segregation to minimize crosstalk.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C38098B-20TIN, the 7005L20PFGI uniquely delivers integrated semaphore registers, push-pull BUSY signaling, and M/S-selectable cascading - reducing BOM count and eliminating timing-critical external logic in multi-processor shared-memory architectures.

Availability

7005L20PFGI is available at Aetrix Electronics and suitable for industrial automation, avionics control, and network infrastructure applications requiring stable component supply across extended product lifecycles.

Supply support for 7005L20PFGI 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) is a fabless semiconductor company specializing in timing, memory interface, and RF solutions, now part of Renesas Electronics.

The IDT7005 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, battery backup, and seamless master/slave scalability.

FAQ

What is the guaranteed maximum access time for the 7005L20PFGI?

The 7005L20PFGI has a guaranteed maximum read cycle time (tRC) of 20 ns across the full industrial temperature range (–40°C to +85°C), verified per AC Electrical Characteristics Table 13a. This ensures reliable operation in 50 MHz synchronous bus environments without wait-state insertion. The 7005L20PFGI achieves this with 700 mW typical active power consumption and maintains compatibility with TTL-level signaling.

Does the 7005L20PFGI support true simultaneous read operations from both ports to the same memory address?

Yes, the 7005L20PFGI implements true dual-port SRAM cells that allow concurrent reads from both left and right ports to identical or overlapping addresses without contention or arbitration delay. This capability is intrinsic to its cell architecture - confirmed in the Features section and Functional Block Diagram - and does not require BUSY assertion or semaphore intervention, making it ideal for mirrored buffer applications.

How does the M/S pin affect BUSY signal behavior on the 7005L20PFGI?

When M/S = H, the 7005L20PFGI operates as a master: BUSYL and BUSYR are push-pull outputs that actively drive LOW during port contention to block conflicting writes. When M/S = L, it operates as a slave: BUSYL and BUSYR become inputs that must be driven LOW by an external master to inhibit local writes. This configuration enables hierarchical arbitration in multi-device systems without external logic.

Can the 7005L20PFGI retain data during power loss, and at what voltage?

Yes, the 7005L20PFGI supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), as specified in DC Electrical Characteristics Table 9. In data retention mode (CE > VHC, VIN > VHC or < VLC), it draws ≤4000 µA in military grade and ≤1500 µA in commercial grade - enabling long-term hold using small backup batteries or supercapacitors without external regulators.

What is the function of the SEM pin on the 7005L20PFGI, and how does it differ from CE?

The SEM (Semaphore Enable) pin selects between RAM mode (SEM = VIH) and semaphore register mode (SEM = VIL). When SEM = VIL and CE = VIH, the device accesses eight internal semaphore flags via I/O0–I/O7 and A0–A2 - enabling atomic set/clear operations. Unlike CE, which gates memory access, SEM reconfigures the entire data path and requires distinct timing (e.g., tSAA ≤ 20 ns, tSOP = 10 ns) per AC Table 13a.