Renesas 7005S35PFG8

Overview

7005S35PFG8 from IDT is a high-speed 8K × 8 true dual-port static RAM with independent left/right ports, 35 ns max access time (commercial grade), TTL-compatible 5 V ±10% supply, and on-chip semaphore/arbitration logic for inter-port synchronization in real-time embedded systems.

For engineers reviewing the 7005S35PFG8 datasheet, 7005S35PFG8 pinout, 7005S35PFG8 application, or 7005S35PFG8 equivalent, this page delivers verified timing specs, Master/Slave port arbitration behavior, BUSY/INT signal timing, dual-port power-down modes, and TQFP-64 package layout - all critical for deterministic memory coherency in multiprocessor designs.

Technical Context

The 7005S35PFG8 implements fully asynchronous dual-port operation: each port (left/right) has dedicated address (A0L–A12L / A0R–A12R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, R/WL/R/WR, OEL/OER), enabling simultaneous reads to the same location without contention. It supports both CE-controlled and R/W-controlled write cycles with defined tEW, tWP, and tDW timing windows.

On-chip hardware includes priority-based port arbitration (via BUSYL/BUSYR flags), eight semaphore registers (addressed by A0–A2), and interrupt flag generation (INTL/INTR) triggered by writes to specific addresses (e.g., 1FFF_H sets INTR). M/S pin configures master (BUSY output) or slave (BUSY input) mode for cascaded 16-bit+ memory expansion.

Key Specifications

Pinout & Package

64-pin thin quad flatpack (TQFP) with 0.5 mm pitch; body size 14 mm × 14 mm × 1.4 mm. Pin 1 marked via corner notch; top view shown in datasheet drawing 2738 drw 03.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-35AXC and AS7C38099B-35JCIN, the 7005S35PFG8 uniquely integrates full hardware arbitration, semaphore registers, and interrupt flags in a compact 64-pin TQFP - reducing BOM count and PCB area while guaranteeing deterministic inter-processor communication in safety-critical systems.

Availability

7005S35PFG8 is available at Aetrix Electronics and suitable for industrial motion controllers, avionics data acquisition units, telecom baseband processors, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.

Supply support for 7005S35PFG8 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, RF, and high-performance silicon solutions for communications, computing, and industrial markets.

The IDT7005 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - delivering hardware-enforced memory coherency without software overhead.

FAQ

What is the maximum operating temperature range certified for the 7005S35PFG8?

The 7005S35PFG8 is rated for commercial temperature operation from 0°C to +70°C. This is explicitly confirmed in the datasheet's "Maximum Operating Temperature and Supply Voltage" table (2738 tbl 05) and applies to the "S" speed grade with 35 ns access time. Industrial (-40°C to +85°C) and military grades exist for other speed variants (e.g., 7005S20), but not for the 35 ns commercial version.

Does the 7005S35PFG8 support battery backup for data retention?

No, the 7005S35PFG8 does not support battery backup. Only the "L" (low-power) variant - such as IDT7005L35PFG8 - specifies 2 V data retention capability and 500 µW typical standby current from a 2 V battery source. The "S" suffix denotes standard power consumption (750 mW active, 5 mW standby), with no data retention specification below 4.5 V.

How does the M/S pin affect BUSY signal behavior on the 7005S35PFG8?

When M/S = H (high), the 7005S35PFG8 operates as a master: BUSYL and BUSYR are push-pull outputs that assert low to block writes during port contention. When M/S = L (low), it operates as a slave: BUSYL and BUSYR become inputs, and the device samples external BUSY signals to inhibit its own writes - enabling hierarchical arbitration in multi-device systems.

Can the 7005S35PFG8 perform simultaneous reads from both ports to the same memory address?

Yes, the 7005S35PFG8 supports true simultaneous reads to the same memory location from left and right ports without contention or timing penalty. This is a core feature of its "true dual-ported memory cells" architecture, explicitly stated in the Features section and enabled by independent sense amplifiers per port - no BUSY assertion or arbitration delay occurs during concurrent reads.

What are the valid address ranges for interrupt flag control on the 7005S35PFG8?

The 7005S35PFG8 uses fixed addresses to control interrupts: writing to address 1FFF_H (left port) or 1FFF_H (right port) sets the corresponding INTR or INTL flag; writing to 1FFE_H clears it. These addresses are hardwired per Truth Table III (2738 tbl 17) and do not depend on external decoding - simplifying interrupt service routine design in dual-processor systems.