Renesas 7008L55G

Overview

7008L55G from IDT is a high-speed 64K × 8 true dual-ported static RAM with independent left/right ports, 55 ns max access time (commercial), 1 mW typical standby power, and full on-chip semaphore/arbitration logic - used in real-time interprocessor communication systems requiring concurrent read/write access to shared memory.

For engineers reviewing the 7008L55G datasheet, 7008L55G pinout, 7008L55G application, or 7008L55G equivalent, this page delivers verified timing specs, master/slave BUSY arbitration behavior, dual-port I/O control semantics, and industrial-grade packaging options for deterministic embedded system design.

Technical Context

The 7008L55G implements fully asynchronous dual-port operation with separate address, data, and control lines per port (A0L–A15L/I/O0L–I/O7L/R/WL/CE0L/CE1L/OEL/SEML/INTL/BUSYL on left; mirrored on right). It supports hardware semaphore signaling via A0–A2 addressing of eight flags and uses push-pull BUSY outputs (not open-drain) for port-to-port write arbitration.

When configured as Master (M/S = VIH), BUSYL/BUSYR are outputs asserting during address/contention conflict; as Slave (M/S = VIL), they become inputs that inhibit writes. Interrupts are triggered by writes to FFFE_H (left flag) or FFFF_H (right flag), with dedicated INTL/INTR outputs.

Key Specifications

Pinout & Package

7008L55G is packaged in a 100-pin TQFP (PNG100) with 0.5 mm pitch, body size ≈14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and IDT70V27L25PF, the 7008L55G uniquely delivers 5 V TTL compatibility, integrated BUSY arbitration, and semaphore logic in a commercial-grade 55 ns package - making it optimal for legacy 5 V embedded systems requiring deterministic dual-port coordination without external glue logic.

Availability

7008L55G is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing systems, industrial motion control, and avionics data acquisition requiring stable component supply and long-term obsolescence management.

Supply support for 7008L55G 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 IDT7008 product line was designed specifically for deterministic, low-latency interprocessor communication in 5 V embedded systems - emphasizing hardware arbitration, semaphore support, and seamless master/slave cascading without external logic.

FAQ

What is the maximum access time specification for the 7008L55G?

The 7008L55G has a maximum address access time (tAA) of 55 ns under commercial temperature conditions (0°C to +70°C) and 5.0 V ±10% supply. This value is production-tested and guaranteed across all operating corners, defining the delay from stable address assertion to valid output data on either port.

Does the 7008L55G support true simultaneous read operations from both ports?

Yes, the 7008L55G uses true dual-ported memory cells that permit simultaneous reads from the same or different addresses on left and right ports without contention or timing penalty - a core architectural feature confirmed in the Functional Description section of the datasheet.

How does the BUSY arbitration logic function in master vs. slave configuration for the 7008L55G?

When M/S = VIH (Master), BUSYL/BUSYR are push-pull outputs asserting LOW during address contention to block writes. When M/S = VIL (Slave), they become inputs that internally inhibit writes when driven LOW - enabling hierarchical arbitration in cascaded systems without external logic.

What are the valid interrupt mailbox addresses for the 7008L55G and how are they triggered?

The 7008L55G uses FFFE_H to set the left port interrupt flag (INTL) and FFFF_H to set the right port flag (INTR). INTL asserts when the right port writes to FFFE_H (CER = R/WR = VIL); INTR asserts when the left port writes to FFFF_H. Both flags clear on subsequent reads of their respective addresses.

Can the 7008L55G operate in a 16-bit data bus configuration?

Yes - the 7008L55G supports 16-bit expansion via Master/Slave cascading using the M/S pin. Two devices can be configured as Master and Slave to form a 64K × 16 memory without external decoding logic, maintaining full-speed operation and error-free arbitration as documented in the Functional Block Diagram and Description sections.