Renesas 7024S55PFI

Overview

7024S55PFI from IDT is a high-speed 4K × 16 true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports master/slave cascading for 32-bit+ bus expansion and on-chip semaphore arbitration-used in real-time DSP inter-processor communication buffers and military-grade avionics shared-memory subsystems.

For engineers reviewing the 7024S55PFI datasheet, 7024S55PFI pinout, 7024S55PFI application, or 7024S55PFI equivalent, key selection considerations include BUSY-flag port arbitration timing (tBDD ≤ 30 ns), dual-byte enable (UB/LB) for multiplexed bus compatibility, battery-backed data retention at 2V (L-version), and 100-pin TQFP packaging with verified 14 mm × 14 mm footprint.

Technical Context

The 7024S55PFI implements fully asynchronous dual-port access with separate address, control, and I/O buses per port, enabling simultaneous reads of identical memory locations. Its on-chip arbitration logic resolves contention via BUSY flag signaling and supports semaphore flag read/write using A0–A2 addressing with dedicated SEM pins.

It features two distinct power modes: active operation (typ. 150 mA ICC for 7024S variant) and full standby (ISB3 ≤ 1.0 mA) with CMOS-level input hold. The device uses standard TTL voltage thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and guarantees 55 ns tRC across –40°C to +85°C.

Key Specifications

Pinout & Package

7024S55PFI is packaged in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body, and exposed thermal pad. Pin functions are symmetrically distributed across four sides to support balanced PCB routing for dual-port bus interfaces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-55AXI and AS7C34098B-55BIN, the 7024S55PFI uniquely delivers integrated hardware semaphore arbitration, master/slave cascading capability, and guaranteed 55 ns dual-port timing within a single 5V package-enabling simpler, more deterministic system designs for real-time embedded applications.

Availability

7024S55PFI is available at Aetrix Electronics and suitable for avionics shared memory, DSP inter-processor buffering, industrial PLC memory hubs, and military crypto module interfaces requiring stable component supply across extended product lifecycles.

Supply support for 7024S55PFI 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 high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 7024S55PFI belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic real-time inter-processor communication in aerospace, defense, and industrial control systems.

FAQ

What is the maximum operating temperature range for the 7024S55PFI?

The 7024S55PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and validated across all AC/DC electrical parameters in the datasheet. The 'I' suffix in 7024S55PFI explicitly denotes industrial grade qualification. No derating is required within this range for tRC ≤ 55 ns or ISB3 ≤ 1.0 mA performance.

Does the 7024S55PFI support battery backup data retention?

Yes, the 7024S55PFI supports data retention at 2.0 V VCC with typical current draw of 100 µA (max 4000 µA) under full standby conditions. This capability is documented in Table 10 (Data Retention Characteristics) and applies to the 'L' version; however, the 'S' in 7024S55PFI indicates standard power, and retention is still functional per datasheet Section 6, though with higher current than L-versions.

How does the M/S pin configure master versus slave operation in the 7024S55PFI?

When M/S = HIGH, the 7024S55PFI operates as Master: BUSYL and BUSYR become output signals indicating port contention. When M/S = LOW, it operates as Slave: BUSYL and BUSYR become inputs accepting BUSY assertions from a Master device. This configuration is mandatory for cascaded systems and directly controls arbitration priority per the Functional Block Diagram and Truth Tables 3–4.

What package type is used for the 7024S55PFI, and what are its mechanical dimensions?

The 7024S55PFI uses a 100-pin Thin Quad Flatpack (TQFP) package, designated PNG100 in IDT documentation. Its body measures 14 mm × 14 mm × 1.4 mm with 0.5 mm lead pitch. Pin 1 location and thermal pad layout match JEDEC MO-153 standards, and the package is RoHS-compliant and lead-free.

Can the 7024S55PFI perform simultaneous reads from both ports to the same memory address?

Yes, the 7024S55PFI features true dual-ported memory cells that allow simultaneous reads from both left and right ports to the exact same address location without contention, arbitration, or timing penalty. This behavior is explicitly stated in the Features section ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location") and is fundamental to its architecture.