Renesas 7006S55JI

Overview

IDT7006S55JI from Integrated Device Technology (IDT) is a high-speed 16K × 8 dual-port static RAM with true independent left/right port access, 55 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous reads/writes to the same memory location and supports master/slave cascading for 16-bit+ data bus expansion in real-time embedded control systems.

For engineers reviewing the IDT7006S55JI datasheet, IDT7006S55JI pinout, IDT7006S55JI application, or IDT7006S55JI equivalent, key selection criteria include BUSY/INT flag timing (tBAA ≤ 55 ns), semaphore arbitration latency (tSPS = 5 ns), dual-port power-down current (ISB3 = 1.0 mA typ.), and 64-pin TQFP package compatibility with PCB layout constraints for high-density memory subsystems.

Technical Context

The IDT7006S55JI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access without external arbitration logic. Its on-chip arbitration logic resolves contention via BUSY flag assertion and supports semaphore signaling across ports using A0–A2 address lines to select one of eight flags.

It features two independent chip enable (CEL/CER), read/write (R/WL/R/WR), and output enable (OEL/OER) controls, plus dedicated semaphore enable (SEML/SEMR), interrupt (INTL/INTR), and master/slave select (M/S) pins. The device operates in either master mode (BUSY output) or slave mode (BUSY input), with tWH = 25 ns write hold after BUSY assertion required for reliable contention resolution.

Key Specifications

Pinout & Package

Package: 64-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm. All VCC and GND pins must be connected per datasheet note requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and AS7C316000B-55JIN, the IDT7006S55JI delivers integrated hardware arbitration, reducing system-level design complexity and improving worst-case latency predictability in safety-critical embedded applications.

Availability

IDT7006S55JI is available at Aetrix Electronics and suitable for industrial motor control, avionics data acquisition, and programmable logic controller applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT7006S55JI 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

Integrated Device Technology (IDT) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.

The IDT7006 family was designed specifically for high-reliability dual-processor and real-time control systems requiring deterministic memory access, hardware-based arbitration, and industrial-grade thermal robustness.

FAQ

What is the maximum operating temperature range for the IDT7006S55JI?

The IDT7006S55JI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Maximum Operating Temperature and Supply Voltage" table (Table 7) and applies to all speed grades within the S-series, including the 55 ns variant. The device uses CMOS process technology optimized for thermal stability across this full range.

Does the IDT7006S55JI support battery backup for data retention?

No, the IDT7006S55JI does not support battery backup. Battery retention capability is exclusive to the L-version (e.g., IDT7006L55JI), which specifies 2V data retention and 100 µA typical ICCDR. The 'S' suffix denotes standard power operation, with 750 mW typical active power and 5 mW typical standby - no low-voltage retention circuitry is included in the S-series die.

How does the M/S pin configure arbitration behavior in the IDT7006S55JI?

When M/S = VIH, the IDT7006S55JI operates as a master: BUSYL is an output that asserts during port contention, and BUSYR is ignored. When M/S = VIL, it operates as a slave: BUSYR becomes an input used to block writes on the right port, while BUSYL remains unused. This configuration enables hierarchical master/slave cascading without external logic, as detailed in the Functional Block Diagram and Pin Names table.

What is the purpose of the semaphore enable pins (SEML/SEMR) on the IDT7006S55JI?

The SEML and SEMR pins enable access to the internal 8-bit semaphore register bank instead of the main RAM array. When SEM = VIL, address lines A0–A2 select one of eight semaphore flags, and I/O0–I/O7 read/write the flag state. This provides hardware-accelerated inter-processor synchronization without software polling or external latches, as defined in Truth Table II and the Semaphore Read/Write Control section.

Can the IDT7006S55JI be used in a single-port configuration?

Yes, the IDT7006S55JI can operate in single-port mode by tying one port's CE pin high (e.g., CER = VIH) and using only the left port (CEL, R/WL, OEL, A0L–A13L, I/O0L–I/O7L). In this mode, all right-port signals become inactive, and the device functions as a standard 16K × 8 SRAM with 55 ns access time and full ISB3 standby capability (1.0 mA typ.). No reconfiguration of M/S or semaphore pins is required.