Renesas 7024S15J8

Overview

7024S15J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 15 ns maximum read cycle time (commercial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic - enabling simultaneous asynchronous access in real-time inter-processor communication systems.

For engineers reviewing the 7024S15J8 datasheet, 7024S15J8 pinout, 7024S15J8 application, or 7024S15J8 equivalent, this page delivers verified timing specs, validated dual-port arbitration behavior, battery-backed data retention at 2V, and precise package mapping for PGA84 footprint integration.

Technical Context

The 7024S15J8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, supporting concurrent read/write to identical memory locations without external logic. Its on-chip arbitration resolves port contention via BUSY flag signaling and master/slave configuration (M/S pin).

It integrates full hardware semaphore support across eight flags (addressed by A0–A2), with dedicated SEM, INT, and BUSY signals per port. The device supports byte-level control (UBL/LBR, UBR/LBR) and operates across commercial temperature range (0°C to +70°C) with 2V data retention capability in low-power mode.

Key Specifications

Pinout & Package

7024S15J8 is packaged in an 84-pin ceramic Pin Grid Array (PGA), designated PLG84 per IDT documentation, with 0.100" pin pitch and body dimensions ~1.15" × 1.15" × 0.17". All VCC and GND pins require decoupling per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-15VC, 7024S15J8 reduces system-level arbitration complexity via on-chip semaphores and BUSY signaling; versus IDT7025S15J, it offers optimized cost and footprint for 64 Kbit requirements without over-provisioning memory.

Availability

7024S15J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC memory expansion requiring stable component supply across long production lifecycles.

Supply support for 7024S15J8 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 since 2019.

The IDT7024 product line was engineered for deterministic, low-latency shared-memory architectures in embedded control and communications systems - emphasizing hardware arbitration, dual-port concurrency, and 5V system compatibility.

FAQ

What is the maximum operating frequency supported by the 7024S15J8?

The 7024S15J8 supports a maximum read cycle time (tRC) of 15 ns, enabling sustained operation at 66.7 MHz per port. This is not a clocked device - its speed is defined by asynchronous timing parameters including tAA (15 ns), tACE (15 ns), and tAOE (10 ns), all validated for commercial temperature range (0°C to +70°C). The 7024S15J8 does not require an external clock signal.

Does the 7024S15J8 support battery backup operation, and what voltage is required?

Yes, the 7024S15J8 supports battery backup operation with data retention down to 2.0 V (VDR), as specified in Table 10. In this mode, standby current (ISB3) drops to ≤ 0.2 mA typical, allowing extended retention from a coin-cell or backup rail. This capability applies specifically to the 'L' variant suffix - confirmed by the 'S' in 7024S15J8 indicating standard power, yet data retention remains functional per IDT characterization.

How does the Master/Slave (M/S) pin affect BUSY signal behavior on the 7024S15J8?

When M/S = HIGH, the 7024S15J8 configures as Master: BUSYL and BUSYR become push-pull outputs that assert during port contention. When M/S = LOW, it configures as Slave: BUSYL and BUSYR become inputs, accepting BUSY signals from a Master device to gate writes. This pin enables cascaded dual-port configurations - e.g., two 7024S15J8 devices forming a 32-bit wide memory with automatic arbitration.

Can the 7024S15J8 perform simultaneous reads from both ports to the same memory address?

Yes, the 7024S15J8 implements true dual-port memory cells that allow fully asynchronous, simultaneous reads from both left and right ports to identical addresses without conflict or delay. This is a core architectural feature - distinct from pseudo-dual-port or pipelined SRAMs - and is explicitly guaranteed in the datasheet's "Features" section and functional block diagram.

What package type is used for the 7024S15J8, and are there pin-compatible alternatives in different packages?

The 7024S15J8 uses an 84-pin ceramic Pin Grid Array (PGA), identified as PLG84 in IDT documentation. While IDT offered the same 7024S15 speed grade in Flatpack (FP84), PLCC, and TQFP (PNG100), these are not pin-compatible - each has distinct pinouts and signal assignments. No drop-in package substitution exists; migration requires PCB redesign and validation of thermal and signal integrity per package form factor.