Renesas 7005L35JI

Overview

7005L35JI from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 35 ns max read cycle time (tRC), 2V data retention capability, and integrated hardware semaphore/arbitration logic for concurrent access coordination. It operates on a single 5V ±10% supply and supports industrial temperature range (−40°C to +85°C), making it suitable for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7005L35JI datasheet, 7005L35JI pinout, 7005L35JI application, or 7005L35JI equivalent, key selection considerations include its 35 ns access timing, low standby current (1 µA typ.), dual-port arbitration behavior under BUSY/INT/SEM control, and TQFP-64 package compatibility with memory coherency designs requiring simultaneous read/write without external logic.

Technical Context

The 7005L35JI implements fully asynchronous dual-port architecture with separate address, data, and control buses for left (L) and right (R) ports. Its on-chip arbitration logic resolves contention via BUSY flag assertion (output when M/S = H, input when M/S = L) and supports master/slave cascading for 16-bit+ word systems using the M/S pin.

It provides dedicated semaphore registers (8 flags, addressed by A0–A2) with atomic read/write control via SEM and OE pins, and interrupt generation (INTL/INTR) triggered by writes to specific addresses (e.g., 1FFF_H sets INTR). All I/Os are TTL-compatible, and the device guarantees 2V data retention during battery backup operation.

Key Specifications

Pinout & Package

7005L35JI is housed in a 64-pin thin quad flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. Pin 1 is marked by a dot or beveled corner; all V_CC and GND pins must be externally decoupled per 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 IDT70V25L35PF, the 7005L35JI uniquely combines 5V operation, 2V data retention, hardware semaphore, and TQFP-64 in a single device-making it optimal for industrial battery-backed dual-CPU systems where pin count, power, and integration are constrained.

Availability

7005L35JI is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC memory coherency, and redundant control system data sharing requiring stable component supply across extended product lifecycles.

Supply support for 7005L35JI 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 since 2019.

The IDT7005 family was designed specifically for high-reliability dual-processor systems requiring deterministic, hardware-managed memory access-targeting industrial automation, telecom infrastructure, and military computing.

FAQ

What is the maximum operating temperature range for the 7005L35JI?

The 7005L35JI is rated for industrial temperature operation from −40°C to +85°C. This range is validated per the datasheet's "Maximum Operating Temperature and Supply Voltage" table and applies to all DC and AC specifications at 35 ns speed grade. Operation outside this range may result in timing violations or data retention failure.

Does the 7005L35JI support true simultaneous read operations on both ports?

Yes, the 7005L35JI implements true dual-port memory cells that allow concurrent reads from the same or different addresses on left and right ports with no arbitration delay. This is explicitly stated in the "Features" section and confirmed by the "Truth Table I" where CE = L, R/W = H, OE = L on both ports yields valid DATAOUT simultaneously.

How does the BUSY signal function in master versus slave configuration for the 7005L35JI?

When M/S = H (master), BUSYL and BUSYR are push-pull outputs that assert low to block writes on the opposite port during contention. When M/S = L (slave), BUSYL and BUSYR become inputs; a low level from the master inhibits local writes. This behavior is defined in Note 1 of the Pin Names table and Figure 13 timing waveforms.

What is the purpose of the SEM pin on the 7005L35JI, and how is it used?

The SEM (semaphore enable) pin selects between memory array access (SEM = H) and semaphore register access (SEM = L). When SEM = L, writes to I/O0 and reads from I/O0–I/O7 target one of eight hardware semaphore flags addressed by A0–A2. This enables atomic resource locking without software intervention or external logic.

Can the 7005L35JI retain data when powered down to 2V, and what conditions apply?

Yes, the 7005L35JI guarantees data retention at V_CC = 2V, as specified in "Data Retention Characteristics" (Table 9). This requires CE ≥ V_HC (≥ V_CC − 0.2V) and all inputs held at valid TTL levels (V_IN > V_HC or < V_LC). The typical retention current is 100 µA, enabling long-term backup with small batteries.