Renesas 7024S55PF

Overview

7024S55PF 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 on-chip semaphore arbitration logic. 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 7024S55PF datasheet, 7024S55PF pinout, 7024S55PF application, or 7024S55PF equivalent, key selection considerations include its 55 ns access timing, dual-port arbitration behavior, BUSY flag signaling mode (M/S-selectable), battery-backed data retention at 2V, and compatibility with industrial-temperature 84-pin PLCC packaging.

Technical Context

The 7024S55PF implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent reads/writes without external arbitration logic. Its on-chip arbitration resolves contention via BUSY flag assertion and supports semaphore flag exchange across ports using dedicated SEM pins and A0–A2 addressing.

It features two independent power-down modes: TTL-level standby (ISB1 = 13 mA max) and CMOS-level full standby (ISB3 = 1.0 mA typ / 5 µA max for L-version), with guaranteed 2V data retention in low-power (L) variants - though 7024S55PF is the S-version, confirming active-mode optimization over ultra-low standby.

Key Specifications

Pinout & Package

7024S55PF is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch and body size ≈1.15 in × 1.15 in × 0.17 in. Pin 1 is marked by a corner notch; all VCC and GND pins must be externally decoupled.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and AS7C34098B-55PC, the 7024S55PF delivers faster BUSY response (20 ns vs. 45/undefined), native semaphore registers, and configurable M/S arbitration - reducing BOM count and simplifying real-time inter-processor coordination.

Availability

7024S55PF is available at Aetrix Electronics and suitable for industrial motor control, PLC backplane interconnect, and redundant automotive communication controllers requiring stable component supply across extended product lifecycles.

Supply support for 7024S55PF 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.

The IDT7024 family was designed specifically for real-time embedded systems requiring deterministic dual-processor memory sharing, with emphasis on hardware arbitration, low-latency BUSY signaling, and industrial-grade reliability.

FAQ

What is the maximum operating frequency supported by the 7024S55PF?

The 7024S55PF does not operate on a clock signal - it is a fully asynchronous static RAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 55 ns, meaning it supports effective throughputs up to ~18.2 MHz in continuous read cycles. Write cycle time (tWC) is also 55 ns, ensuring symmetrical bandwidth for read/write operations without clock domain constraints. This makes the 7024S55PF ideal for systems where timing predictability matters more than synchronous clocking.

Does the 7024S55PF support battery backup for data retention?

The 7024S55PF is the "S" (standard power) variant of the IDT7024 family and does not guarantee 2V data retention. Only the "L" (low-power) versions (e.g., 7024L55PF) specify VDR = 2.0 V and ICCDR ≤ 4000 µA for data retention. The 7024S55PF requires VCC ≥ 4.5 V for full operation and enters undefined state below 4.5 V; it lacks the optimized leakage control of the L-version. For battery-backed applications, select 7024L55PF instead.

How does the M/S pin affect BUSY functionality in the 7024S55PF?

When M/S = HIGH, the 7024S55PF operates as a Master: BUSYL and BUSYR become push-pull outputs that assert within 20 ns (tBAA) upon same-address contention. When M/S = LOW, it operates as a Slave: BUSYL and BUSYR become inputs, allowing external BUSY signals from a Master device to gate local write operations. This configuration enables hierarchical arbitration in multi-device systems - e.g., one Master coordinates multiple Slaves - and is fundamental to the 7024S55PF's use in scalable memory architectures.

Can the 7024S55PF perform simultaneous reads from both ports to the same memory address?

Yes - the 7024S55PF uses true dual-port SRAM cells that permit completely independent, simultaneous reads from both left and right ports to the exact same memory location (e.g., A0L=A0R…A11L=A11R). No BUSY assertion occurs, no arbitration delay is introduced, and both ports deliver valid data within their respective tAA (20 ns max) and tAOE (13 ns max) windows. This capability is explicitly confirmed in the datasheet's "True Dual-Ported memory cells" feature and is foundational to its use in mirrored buffer and real-time logging applications.

What package type is used for the 7024S55PF and what are its mechanical characteristics?

The 7024S55PF uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, designated PLG84 in IDT documentation. Its body measures approximately 1.15 inches × 1.15 inches × 0.17 inches (29.2 mm × 29.2 mm × 4.3 mm), with J-leads for surface-mount assembly. Pin 1 is identified by a corner notch; all 12 VCC and 12 GND pins must be individually decoupled with 0.1 µF ceramics. This package provides superior thermal dissipation and mechanical reliability compared to SOIC alternatives, making it preferred for industrial and automotive applications where vibration and thermal cycling are concerns.