Renesas 7006S35J

Overview

7006S35J from IDT is a high-speed 16K × 8 dual-port static RAM with true independent left/right port access, 35 ns max read cycle time (tRC), TTL-compatible 5V ±10% supply, and integrated semaphore/arbiration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7006S35J datasheet, 7006S35J pinout, 7006S35J application, or 7006S35J equivalent, this page delivers verified timing specs, master/slave BUSY arbitration behavior, industrial temperature support (–40°C to +85°C), and TQFP-64 package compatibility for deterministic multi-CPU memory sharing.

Technical Context

The 7006S35J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling simultaneous reads from identical memory locations without contention. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports semaphore signaling across eight flags addressed by A0–A2.

It operates in MASTER (M/S = H) or SLAVE (M/S = L) mode: MASTER asserts BUSY output on address or CE match; SLAVE uses BUSY as input to gate writes. All control signals-including CEL/CER, R/WL/R/WR, OEL/OER-are independently active per port, with no shared timing dependencies between ports.

Key Specifications

Pinout & Package

7006S35J is packaged in a 64-pin thin quad flatpack (TQFP), measuring 14 mm × 14 mm × 1.4 mm, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected). All VCC and GND pins must be decoupled locally per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-35JC and IDT70V27L25PF, the 7006S35J uniquely integrates BUSY arbitration and semaphore registers in a 5V/2V-retentive TQFP package-making it the only drop-in solution for industrial dual-CPU systems requiring deterministic conflict resolution without added components.

Availability

7006S35J is available at Aetrix Electronics and suitable for real-time industrial PLCs, avionics interface modules, dual-core DSP buffers, and redundant safety controllers requiring stable component supply across extended product lifecycles.

Supply support for 7006S35J 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 memory, timing, and interface solutions for communications, computing, and industrial markets.

The 7006S35J belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in mission-critical embedded systems where hardware arbitration and data retention are mandatory.

FAQ

What is the maximum operating frequency supported by the 7006S35J?

The 7006S35J supports a maximum read cycle time (tRC) of 35 ns, corresponding to a theoretical maximum operating frequency of 28.6 MHz for continuous sequential access. This value is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply. Actual system clock rate depends on address setup, hold, and enable timing margins-not just tRC-and must comply with all AC parameters in Tables 13b and 14b of the official datasheet.

Does the 7006S35J support battery backup operation?

Yes, the 7006S35J supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), as specified in Table 9. In data retention mode, ICCDR is typically 100 µA and up to 4000 µA over military/industrial temperature ranges. The device retains valid data without external refresh, making it suitable for applications like UPS-controlled systems or safety-critical black-box recorders where main power may fail unexpectedly.

How does the M/S pin affect BUSY signal behavior in the 7006S35J?

When M/S = H, the 7006S35J operates as MASTER: BUSYL and BUSYR become push-pull outputs that assert low on address or chip-enable match. When M/S = L, it operates as SLAVE: BUSYL and BUSYR become inputs used to gate writes-requiring external BUSY assertion from a MASTER device. This configuration enables hierarchical arbitration in multi-device systems without additional logic, and is fundamental to the 7006S35J's dual-port coherency model.

Can the 7006S35J perform simultaneous read operations from both ports to the same memory address?

Yes, the 7006S35J features true dual-port memory cells that allow simultaneous reads from identical memory locations on left and right ports without contention, arbitration delay, or data corruption. This capability is intrinsic to its cell architecture-not dependent on timing or external control-and is explicitly confirmed in the "Features" section of the datasheet. No BUSY assertion occurs during concurrent reads, and output validity follows standard tAA/tACE timing per port.

What package type is used for the 7006S35J, and what are its key mechanical dimensions?

The 7006S35J uses a 64-pin thin quad flatpack (TQFP) package, designated PNG64 in IDT documentation. Its body measures 14 mm × 14 mm × 1.4 mm with 0.5 mm lead pitch. The package includes exposed thermal pad (non-functional, no internal connection) and requires standard reflow profile for lead-free assembly. Pin 1 location is marked by a dot or notch, and all VCC/GND pins must be individually decoupled per datasheet layout recommendations.