Renesas 7006S55PFI8

Overview

7006S55PFI8 from 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 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It integrates on-chip arbitration, semaphore logic, and BUSY/INT flags for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7006S55PFI8 datasheet, 7006S55PFI8 pinout, 7006S55PFI8 application, or 7006S55PFI8 equivalent, key selection criteria include simultaneous asynchronous port operation, 55 ns access timing, master/slave cascading capability, battery-backed data retention at 2 V, and support for semaphore-based resource sharing in multi-CPU architectures.

Technical Context

The 7006S55PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent read/write operations without external logic. Its on-chip arbitration resolves contention via BUSY flag assertion (M/S = H) or BUSY input (M/S = L), while semaphore registers (A0–A2 addressed) provide hardware-mapped mutual exclusion across ports.

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), with dedicated timing parameters (tSAA, tSOP, tSWRD) validated for 55 ns speed grade. Power management includes four standby current states (ISB1–ISB4), with full CMOS-level standby drawing as low as 0.2 mA typ.

Key Specifications

Pinout & Package

7006S55PFI8 is packaged in a 64-pin thin quad flatpack (TQFP), measuring 14 mm × 14 mm × 1.4 mm, with 0.5 mm lead pitch and exposed thermal pad. All VCC and GND pins require direct connection to respective power planes 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 AS7C316000PFSI-55, the 7006S55PFI8 uniquely combines 5 V compatibility, hardware semaphore support, master/slave cascading, and industrial temperature rating-making it irreplaceable in legacy 5 V multi-CPU systems requiring minimal external logic.

Availability

7006S55PFI8 is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, medical imaging buffers, and test equipment requiring stable component supply across extended product lifecycles.

Supply support for 7006S55PFI8 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, RF, and sensor solutions, now part of Renesas Electronics.

The 7006S55PFI8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems requiring hardware-enforced resource sharing and seamless 5 V integration.

FAQ

What is the maximum operating frequency supported by the 7006S55PFI8?

The 7006S55PFI8 does not operate at a fixed clock frequency-it is an asynchronous SRAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 55 ns, corresponding to a theoretical maximum sustained access rate of ~18.2 MHz. Actual system throughput depends on address/data setup/hold times and bus protocol overhead, not a clock signal.

Does the 7006S55PFI8 support battery backup operation, and what voltage is required?

Yes, the 7006S55PFI8 supports battery backup data retention. When main VCC drops below 2.0 V, the device retains stored data as long as the backup supply remains ≥2.0 V. This is specified in the Data Retention Characteristics table (Table 9), with typical ICCDR of 100 µA at 2 V-enabling years of retention on small coin cells.

How does the M/S pin affect BUSY signal behavior on the 7006S55PFI8?

When M/S = H (master), BUSYL and BUSYR are outputs that assert low during port contention to block conflicting accesses. When M/S = L (slave), BUSYL and BUSYR become inputs-allowing external arbitration signals to control local port activity. This dual-role design enables flexible master/slave configurations in multi-chip systems without redesigning the PCB.

Can the 7006S55PFI8 be used in a 16-bit data bus configuration?

Yes, the 7006S55PFI8 supports 16-bit expansion via master/slave cascading. Two devices are connected with M/S = H on the master and M/S = L on the slave; the master's BUSY output drives the slave's BUSY input. This configuration uses the internal arbitration logic to synchronize access across both chips, delivering full-speed 16-bit operation without external glue logic.

What are the key differences between the 'S' and 'L' variants in the 7006S55PFI8 family?

The 'S' suffix denotes standard power (750 mW active, 5 mW standby), while 'L' indicates low-power (700 mW active, 1 mW standby) with enhanced 2 V data retention. The 7006S55PFI8 is the 'S' variant-optimized for performance-critical applications where faster wake-up from standby and higher drive strength are prioritized over ultra-low quiescent current.