Renesas 7007L15J

Overview

IDT7007L15J from IDT (now Renesas) is a high-speed 32K × 8 true dual-port static RAM with independent left/right ports, 15 ns max access time (commercial grade), TTL-compatible 5 V ±10% supply, and integrated hardware semaphore and interrupt logic - used in real-time inter-processor communication systems such as industrial PLCs and telecom line cards.

For engineers reviewing the IDT7007L15J datasheet, IDT7007L15J pinout, IDT7007L15J application, or IDT7007L15J equivalent, key selection considerations include port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S configuration, dual-port power-down current (ISB3 = 0.2 mA typ.), and compatibility with 68-pin PLCC footprint for legacy board reuse.

Technical Context

The IDT7007L15J implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY assertion (push-pull, not open-drain) when both ports access the same address, with priority determined by tAPS setup timing.

It supports two distinct memory access modes: standard RAM access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW), using A0–A2 to select among eight semaphore flags. Interrupt flags (INTL/INTR) are set/cleared by writes to dedicated mailbox addresses (7FFEh/7FFFh).

Key Specifications

Pinout & Package

68-pin PLCC package with 0.95″ × 0.95″ footprint and J-lead geometry; requires all VCC (pins 12, 24, 36, 48, 60) and GND (pins 11, 23, 35, 47, 59) pins to be connected to respective rails.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C33256P-15JC, the IDT7007L15J uniquely integrates arbitration, semaphore, and interrupt logic in a drop-in PLCC package - reducing BOM count and eliminating timing-critical FPGA glue logic for inter-processor coordination.

Availability

IDT7007L15J is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line cards, avionics data concentrators, and medical imaging subsystems requiring stable component supply and long-term obsolescence mitigation.

Supply support for IDT7007L15J 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

Renesas Electronics (formerly Integrated Device Technology) is a global semiconductor leader specializing in high-performance memory, timing, and embedded processing solutions for industrial, communications, and automotive markets.

The IDT7007L15J belongs to the IDT7000 family of dual-port SRAMs, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and mailbox functionality are essential.

FAQ

What is the maximum operating frequency supported by the IDT7007L15J?

The IDT7007L15J does not operate on a clock signal - it is an asynchronous SRAM. Its 15 ns access time (tAA) supports read cycle rates up to approximately 66.7 MHz when interfaced with logic meeting AC timing requirements (e.g., tRC ≥ 15 ns). Actual system frequency depends on address/control setup/hold margins and bus loading.

Does the IDT7007L15J require external pull-up resistors on BUSY or INT pins?

No. The IDT7007L15J features push-pull outputs on BUSYL, BUSYR, INTL, and INTR - no external pull-ups are needed. These pins drive actively high or low depending on arbitration state or interrupt condition, unlike open-drain alternatives that mandate external termination.

How is semaphore functionality accessed on the IDT7007L15J?

Semaphore registers are accessed by asserting SEM = LOW and CE = HIGH on the desired port, then using A0–A2 to select one of eight flags while reading/writing I/O0–I/O7. This mode is electrically and logically isolated from main memory access (which requires SEM = HIGH, CE = LOW), preventing accidental flag corruption.

Can the IDT7007L15J be used in a single-port configuration?

Yes. Either port (left or right) can be used independently by tying its CE pin HIGH (disabling that port) and operating only the other. All control, address, and I/O pins for the disabled port may be left unconnected or tied to valid logic levels - no special configuration is required beyond CE deassertion.

What is the significance of the 'L' suffix in IDT7007L15J?

The 'L' denotes low-power variant - confirmed by ISB3 = 0.2 mA typical (vs 1.0 mA for 'S' version) and ICC dynamic current of 190 mA typical (vs 325 mA for 'S'). This reflects optimized CMOS design for reduced active and standby power, critical in thermally constrained or battery-backed systems.