Renesas 7024S55PFI8

Overview

7024S55PFI8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns max read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7024S55PFI8 datasheet, 7024S55PFI8 pinout, 7024S55PFI8 application, or 7024S55PFI8 equivalent, key selection considerations include BUSY-flag arbitration timing (tBDD ≤ 30 ns), on-chip semaphore support (8 flags via A0–A2), battery-backed data retention at 2V (IDT7024L variant), and compatibility with 84-pin PLCC packaging for legacy industrial PCB layouts.

Technical Context

The 7024S55PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent read/write operations without external arbitration logic. Its on-chip port arbitration logic resolves contention via BUSY flag signaling and supports both master (BUSY output) and slave (BUSY input) configurations using the M/S pin.

It integrates full hardware semaphore signaling across ports using SEM/SEML/SEMR pins and dedicated I/O0–I/O15 lines for flag read/write, with tSWRD = 5 ns semaphore write-to-read latency. The device operates in standard TTL voltage levels and includes separate upper-byte (UBR/UBL) and lower-byte (LBR/LBL) enables for multiplexed bus interfacing.

Key Specifications

Pinout & Package

7024S55PFI8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC) with 0.050" lead pitch, body size ≈ 1.15 in × 1.15 in × 0.17 in. Pin 1 is marked by a corner notch; all VCC and GND pins require local decoupling per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-55AXC and AS7C34096B-55PCN, the 7024S55PFI8 delivers native 5V operation and hardware arbitration in a drop-in PLCC package-reducing system-level complexity and validation effort for industrial retrofits and avionics upgrades.

Availability

7024S55PFI8 is available at Aetrix Electronics and suitable for industrial PLC memory buffers, dual-CPU real-time control systems, legacy avionics data recorders, and test equipment pattern memory requiring stable component supply across extended product lifecycles.

Supply support for 7024S55PFI8 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 since 2019.

The IDT7024 family was engineered for deterministic, low-latency shared memory in hard real-time systems-targeting industrial automation, military computing, and telecommunications infrastructure where bus contention must be resolved in hardware.

FAQ

What is the maximum operating speed of the 7024S55PFI8?

The 7024S55PFI8 has a guaranteed maximum read cycle time of 55 ns across the industrial temperature range (–40°C to +85°C), supporting sustained random-access throughput up to 18.2 MHz. This specification is validated under VCC = 5.0 V ±10% and includes margin for worst-case process, voltage, and temperature corners. The 7024S55PFI8 does not require clocking-it operates asynchronously, so timing is governed solely by signal propagation and setup/hold constraints.

Does the 7024S55PFI8 support battery backup for data retention?

The 7024S55PFI8 is the "S" (standard power) variant and does not support battery backup data retention. Only the "L" variant (e.g., 7024L55PFI8) guarantees data retention at 2V with typical standby current of 5 µA. The 7024S55PFI8 draws ~13 mA in ISB1 standby mode and requires continuous 5V supply to maintain memory state. For battery-backed applications, the 7024L55PFI8 must be selected instead.

How does the M/S pin affect BUSY signal behavior in the 7024S55PFI8?

In the 7024S55PFI8, the M/S pin configures BUSY pin direction: when M/S = HIGH, BUSYL and BUSYR function as open-collector outputs indicating port contention (Master mode); when M/S = LOW, they become inputs accepting BUSY assertions from another device (Slave mode). This enables daisy-chained master/slave configurations for wider data buses-e.g., two 7024S55PFI8 devices can form a 4K × 32 system with automatic arbitration.

Can the 7024S55PFI8 be used in a single-port configuration?

Yes-the 7024S55PFI8 can operate as a single-port SRAM by tying one port's CE (e.g., CER) permanently HIGH and using only the other port's address, data, and control lines. All internal resources remain functional, but arbitration, semaphore, and BUSY features are inactive unless both ports are enabled. This mode reduces power consumption and simplifies interface logic for applications needing only one active controller.

What package type is used for the 7024S55PFI8?

The 7024S55PFI8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, identified by suffix "PFI8". Its body dimensions are approximately 1.15 in × 1.15 in × 0.17 in with J-lead geometry. This package is RoHS-compliant, surface-mountable, and compatible with standard reflow profiles. Pin 1 is located at the corner notch; VCC and GND pins are distributed across the perimeter to minimize noise coupling.