Renesas 7008L15JG8

Overview

IDT7008L15JG8 from IDT (now Renesas) is a high-speed 64K × 8 true dual-port static RAM with independent left/right ports, 15 ns max access time (commercial grade), TTL-compatible 5V ±10% supply, and integrated port arbitration logic. It enables simultaneous read/write access to the same memory location and supports MASTER/SLAVE cascading for 16-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the IDT7008L15JG8 datasheet, IDT7008L15JG8 pinout, IDT7008L15JG8 application, or IDT7008L15JG8 equivalent, key selection considerations include BUSY-flag arbitration timing (tBDD ≤15 ns), semaphore flag support (8 flags via A0–A2), dual chip-enable depth expansion, industrial-grade standby power (1 mW typ.), and TQFP-100 package compatibility with PCB layout for multi-processor shared-memory subsystems.

Technical Context

The IDT7008L15JG8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port - enabling concurrent reads/writes without internal synchronization clocks. Its on-chip arbitration logic resolves contention via push-pull BUSY outputs (not open-drain) and supports both address-match and CE-controlled BUSY assertion modes.

It integrates full hardware semaphore signaling (8 flags addressed by A0–A2), interrupt flag generation (INTL/INTR triggered at FFFE/FFFFH), and automatic power-down via CE0/CE1 enables - allowing per-port standby states with ISB3 ≤5 µA (CMOS-level inputs). The device uses CMOS process technology and requires no external logic for MASTER/SLAVE configuration when cascading.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size ≈14 mm × 14 mm × 1.4 mm, lead-free (green) option available per ordering info.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C364B-15JCIN, the IDT7008L15JG8 uniquely integrates hardware semaphore, BUSY arbitration, and interrupt signaling in a 5V 64K×8 footprint - reducing BOM count and eliminating timing-critical firmware arbitration loops required by alternatives.

Availability

IDT7008L15JG8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC dual-core coordination requiring stable component supply across extended production lifecycles.

Supply support for IDT7008L15JG8 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and RF power solutions for high-performance computing and communications infrastructure.

The IDT7008L15JG8 belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency shared-memory architectures in multi-processor embedded systems where hardware arbitration and interrupt signaling are essential.

FAQ

What is the maximum operating frequency supported by the IDT7008L15JG8?

The IDT7008L15JG8 does not operate on a clock; it is fully asynchronous. Its 15 ns maximum access time enables reliable read cycles up to approximately 66.7 MHz when using optimal setup/hold timing. Actual system throughput depends on CE, OE, and address stability margins - the device guarantees tRC ≤15 ns under commercial temperature and 5V ±10% conditions. IDT7008L15JG8 performance remains stable without clock distribution networks or skew management.

How does the BUSY arbitration logic work in the IDT7008L15JG8?

In IDT7008L15JG8, BUSY arbitration resolves port contention via hardware detection of address matches or overlapping CE assertions. When M/S = VIH (Master), BUSYL/BUSYR are outputs that assert low to block writes on the contending port. tAPS = 5 ns minimum ensures priority resolution, and tBDD ≤15 ns defines the delay from BUSY deassertion to valid read data. As Slave (M/S = VIL), BUSY pins become inputs that internally inhibit writes - no external pull-ups required since outputs are push-pull.

Can the IDT7008L15JG8 be used in a 16-bit data bus configuration?

Yes - the IDT7008L15JG8 supports 16-bit expansion via MASTER/SLAVE cascading. Two IDT7008L15JG8 devices can be configured with one as Master (M/S = VIH) and the other as Slave (M/S = VIL), sharing BUSY lines to coordinate access. This yields a 64K × 16-bit memory without external logic, maintaining full-speed operation and error-free handshaking as specified in the functional description. Each IDT7008L15JG8 retains its independent 8-bit I/O ports in this configuration.

What are the power consumption characteristics of the IDT7008L15JG8 in standby mode?

IDT7008L15JG8 offers multiple standby modes: ISB3 (full standby, both ports disabled with CMOS inputs) is 1 µA typical; ISB1 (both ports TTL-disabled) is 40 mA typical; ISB4 (one port active, one in CMOS standby) is 80 mA typical. The 1 µA ISB3 value enables ultra-low-power retention in battery-backed systems. All values are measured at VCC = 5.0 V, TA = +25°C, and reflect actual silicon characterization - not datasheet limits.

Does the IDT7008L15JG8 support semaphore operations, and how are they implemented?

Yes - IDT7008L15JG8 includes eight dedicated hardware semaphore flags accessed via A0–A2 when SEM = VIL and CE = VIH. Writing to I/O0 sets/clears each flag; reading returns the flag state on all I/O0–I/O7 pins. Semaphore timing includes tSOP = 10 ns (update pulse) and tSPS = 5 ns (contention window), ensuring atomic lock acquisition. This eliminates software-based test-and-set routines and prevents race conditions in multi-processor environments using IDT7008L15JG8.