Renesas 7024S55GB

Overview

7024S55GB 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 7024S55GB datasheet, 7024S55GB pinout, 7024S55GB application, or 7024S55GB equivalent, key selection considerations include BUSY/INT flag timing, semaphore arbitration latency, byte-selectable I/O control, and battery-backed data retention at 2V - critical for fault-tolerant dual-CPU interlock and legacy military avionics memory subsystems.

Technical Context

The 7024S55GB implements full on-chip hardware semaphore signaling and port arbitration logic, enabling deterministic contention resolution without external logic. Its dual-port architecture allows concurrent reads/writes across independent address/control/I/O buses, with separate upper-byte (UBR/UBL) and lower-byte (LBR/LBL) enables for multiplexed bus compatibility.

It supports two distinct operational modes: RAM access (CE = VIL, SEM = VIH) and semaphore flag access (CE = VIH or UB&LB = VIH, SEM = VIL), each with dedicated timing parameters (e.g., tSAA ≤ 55 ns, tSWRD = 5 ns). BUSY flag behavior is configurable via M/S pin: output in Master mode (M/S = H), input in Slave mode (M/S = L).

Key Specifications

Pinout & Package

7024S55GB is packaged in a 100-pin TQFP (PNG100) with 0.5 mm pitch, 14 mm × 14 mm body, and 1.4 mm height. Pin functions are fully defined per IDT datasheet revision Feb.20.20, including dual-port I/O (I/O0L–I/O15L / I/O0R–I/O15R), independent control (CEL/CER, OEL/OER, R/WL/R/WR), and arbitration signals (BUSYL/BUSYR, INTL/INTR, SEML/SEMR, M/S).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-55AXC and AS7C34098B-55PCN, the 7024S55GB uniquely delivers integrated semaphore arbitration and 2 V battery retention in a drop-in 5 V TTL-compatible package - making it irreplaceable in legacy-reliant, safety-critical dual-CPU designs where external logic adds failure modes.

Availability

7024S55GB is available at Aetrix Electronics and suitable for real-time dual-CPU control, aerospace avionics data buffering, and industrial PLC memory coherency requiring stable component supply across extended production lifecycles.

Supply support for 7024S55GB 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 product line was designed specifically for deterministic, low-latency inter-processor communication in military, industrial, and telecom systems requiring hardware-enforced memory coherency without software overhead.

FAQ

What is the maximum operating speed of the 7024S55GB dual-port SRAM?

The 7024S55GB has a guaranteed maximum read cycle time of 55 ns across the industrial temperature range (–40°C to +85°C), corresponding to a theoretical maximum throughput of ~18.2 MHz for consecutive read operations. This timing is validated under VCC = 5.0 V ±10% and includes all setup/hold and propagation delays specified in the AC Electrical Characteristics tables.

Does the 7024S55GB support battery backup for data retention?

Yes, the 7024S55GB - as part of the IDT7024L family - supports data retention at VCC = 2.0 V with typical standby current of 0.2 mA (ISB3) under full CMOS-input standby conditions. This capability is explicitly documented in Table 10 (Data Retention Characteristics) and applies to the 'L' suffix variant, which 7024S55GB belongs to per its ordering code structure.

How does the BUSY signal function in master/slave configuration with the 7024S55GB?

In the 7024S55GB, the M/S pin configures BUSY behavior: when M/S = H, BUSY is an output flag indicating port contention; when M/S = L, BUSY is an input used by slave devices to block writes during master-initiated access. The timing parameters tBAA, tBDA, and tBDD (all ≤55 ns max) define response latency, and BUSY is implemented as a non-tri-stated push-pull driver per datasheet Note 2.

Can the 7024S55GB be used for semaphore-based resource locking between two processors?

Yes, the 7024S55GB integrates eight hardware semaphore flags accessible via I/O0–I/O15 using address lines A0–A2. Semaphore access uses dedicated timing (tSOP = 5 ns, tSAA ≤55 ns) and operates independently of RAM access (SEM = VIL vs. SEM = VIH). This eliminates external logic and guarantees atomic flag updates with deterministic priority resolution via tAPS = 5 ns.

What package type is used for the 7024S55GB and what are its key mechanical dimensions?

The 7024S55GB is supplied in a 100-pin Thin Quad Flatpack (TQFP) package designated PNG100, with body dimensions of 14 mm × 14 mm × 1.4 mm and 0.5 mm lead pitch. This surface-mount package is RoHS-compliant and optimized for automated placement and reflow soldering in high-reliability industrial and aerospace PCB assemblies.