Renesas 7005S35PF8

Overview

7005S35PF8 from IDT is a high-speed 8K × 8 (64 Kbit) true dual-port static RAM with independent left/right ports, 35 ns max read cycle time (tRC), TTL-compatible 5 V ±10% supply, and integrated hardware semaphore/arbitration logic for inter-port synchronization. It enables simultaneous asynchronous access to the same memory location and supports MASTER/SLAVE cascading for 16-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7005S35PF8 datasheet, 7005S35PF8 pinout, 7005S35PF8 application, or 7005S35PF8 equivalent, key selection criteria include its 35 ns speed grade, TQFP-64 package, dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S configuration, and battery-backed data retention capability at 2 V (IDT7005L variant).

Technical Context

The 7005S35PF8 implements fully asynchronous dual-port operation with separate address, data, and control lines per port (A0L–A12L/I/O0L–I/O7L/R/WL/CEL/OEL on left; A0R–A12R/I/O0R–I/O7R/R/WR/CER/OER on right). Its on-chip arbitration logic resolves port contention via BUSY flag assertion (push-pull output) and supports semaphore signaling using A0–A2 to select among eight flags.

It features automatic power-down via CE control, operates across commercial temperature range (0°C to +70°C), and uses CMOS process technology delivering 150 mA typical dynamic current (ICC) and 13 mA typical standby current (ISB1) at 35 ns speed. The device requires no external logic for MASTER/SLAVE configuration when expanding data width.

Key Specifications

Pinout & Package

7005S35PF8 is housed in a 64-pin thin quad flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body, and exposed thermal pad (not electrically connected). All VCC pins require local decoupling; all GND pins must be solidly tied to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-35JC and AS7C38097A-35PCN, the 7005S35PF8 delivers unique on-chip arbitration and semaphore capabilities in the same TQFP-64 footprint, enabling direct replacement in systems requiring deterministic inter-processor coordination without redesigning control logic.

Availability

7005S35PF8 is available at Aetrix Electronics and suitable for real-time industrial PLCs, digital signal processing buffers, avionics data concentrators, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for 7005S35PF8 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 high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT7005 family was designed specifically for deterministic real-time embedded systems requiring concurrent, conflict-free memory access between multiple processors or functional blocks.

FAQ

What is the maximum operating frequency supported by the 7005S35PF8?

The 7005S35PF8 does not specify a clock frequency but defines timing via cycle times. Its 35 ns maximum read cycle time (tRC) corresponds to a theoretical maximum sustained access rate of approximately 28.6 MHz. Actual system throughput depends on address/data setup/hold timing and bus protocol overhead, not a fixed clock input.

Does the 7005S35PF8 support battery backup for data retention?

The 7005S35PF8 is the standard-power "S" variant and does not support battery backup. Battery retention (2 V operation) is exclusive to the "L" variant (e.g., 7005L35PF8). The 7005S35PF8 requires continuous 5 V supply for data retention; loss of VCC results in immediate data loss.

How does the M/S pin affect BUSY signal behavior on the 7005S35PF8?

When M/S = HIGH, the 7005S35PF8 operates as a MASTER: BUSYL and BUSYR are push-pull outputs asserting LOW during port contention. When M/S = LOW, it operates as a SLAVE: BUSYL and BUSYR become inputs that must be driven LOW by an external MASTER to inhibit writes on the slave port.

Can the 7005S35PF8 be used in a single-port configuration?

Yes - either port (left or right) can be used independently while the other port remains unconnected or held inactive (CE high). The device retains full functionality as a standard 8K × 8 SRAM in single-port mode, with all timing parameters unchanged and no penalty in speed or power.

What is the purpose of the semaphore enable (SEML/SEMR) pins on the 7005S35PF8?

SEML and SEMR enable access to eight dedicated hardware semaphore flags. When asserted (LOW), address bits A0–A2 select one of eight flags, and I/O0–I/O7 read/write the flag state. This provides atomic inter-port synchronization without software intervention or external logic.