Renesas 7024S17J8

Overview

7024S17J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 17 ns maximum read cycle time (commercial grade), on-chip semaphore and arbitration logic, and TTL-compatible 5V ±10% operation - used in real-time inter-processor communication, video frame buffers, and military-grade avionics data exchange systems.

For engineers reviewing the 7024S17J8 datasheet, 7024S17J8 pinout, 7024S17J8 application, or 7024S17J8 equivalent, key selection criteria include dual-port contention resolution timing (tBDD ≤ 18 ns), battery-backed data retention at 2V (IDT7024L variant), master/slave BUSY flag behavior, and 84-pin PGA package compatibility with legacy MIL-STD-883 layouts.

Technical Context

The 7024S17J8 implements fully asynchronous dual-port access with separate address, control, and I/O buses per port, enabling simultaneous reads from the same memory location. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports semaphore signaling across both ports using dedicated SEM/INT pins.

It operates in two distinct modes: as a standalone 64K-bit dual-port RAM or as part of a master/slave cascaded configuration for 32-bit+ bus expansion. The M/S pin configures BUSY as output (master) or input (slave), and interrupt flags (INTL/INTR) provide cross-port event notification without external logic.

Key Specifications

Pinout & Package

7024S17J8 is packaged in an 84-pin ceramic Pin Grid Array (PLG84), body size ≈ 1.15 in × 1.15 in × 0.17 in, with all VCC and GND pins requiring direct connection to respective supply rails per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15JC and IDT70V24L17PF, the 7024S17J8 uniquely combines 84-pin ceramic PGA packaging, 5V TTL compatibility, and MIL-STD-883 qualification - making it irreplaceable in legacy avionics and radiation-tolerant upgrades where socket reuse and hermetic sealing are mandatory.

Availability

7024S17J8 is available at Aetrix Electronics and suitable for avionics data exchange, industrial PLC memory buffering, and military radar signal processing requiring stable component supply across extended product lifecycles.

Supply support for 7024S17J8 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, now part of Renesas Electronics.

The IDT7024 family was designed for deterministic inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, low-latency dual access, and ruggedized packaging for aerospace and defense applications.

FAQ

What is the maximum operating speed of the 7024S17J8?

The 7024S17J8 has a maximum read cycle time of 17 ns, supporting up to 58.8 MHz effective throughput per port under commercial temperature conditions (0°C to +70°C). This value is guaranteed across the full operating voltage range of 4.5 V to 5.5 V and reflects worst-case propagation delay including address, chip enable, and output enable timing paths. The 7024S17J8 does not require a clock signal - its speed is governed entirely by asynchronous timing parameters such as tRC, tAA, and tACE.

Does the 7024S17J8 support battery backup operation?

The 7024S17J8 itself is the "S" (standard power) variant and does not support battery backup data retention. However, the pin-compatible IDT7024L17J8 variant - which shares identical timing, pinout, and functionality - guarantees data retention down to 2 V VCC. The 7024S17J8 datasheet explicitly states that only the "L" version provides this capability, and the "S" suffix denotes 750 mW typical active power with 5 mW standby, versus 500 µW standby for the L version.

How does the BUSY flag function in master/slave configurations with the 7024S17J8?

In the 7024S17J8, the M/S pin determines BUSY behavior: when high, BUSY is an output flag indicating port contention; when low, BUSY becomes an input that must be monitored before initiating a write. For example, in a master/slave pair, the master asserts BUSYR to block the slave's right-port write if both attempt access to the same address simultaneously. The slave samples BUSYR and delays its write until the signal deasserts - ensuring atomicity without software intervention. This is documented in Truth Table I and Figure 14 of the datasheet.

Can the 7024S17J8 be used in a 32-bit data bus configuration?

Yes - the 7024S17J8 supports 32-bit expansion via master/slave cascading using the M/S pin and BUSY flag. Two devices can be configured as master and slave, with the master's BUSY output driving the slave's BUSY input. This enables coordinated access across 32-bit word boundaries without external arbitration logic. The datasheet confirms this capability in the "Description" section and highlights that it delivers "full-speed, error-free operation" - meaning no performance penalty or added latency beyond the intrinsic tBDD parameter (≤18 ns).

What package type is used for the 7024S17J8?

The 7024S17J8 uses an 84-pin ceramic Pin Grid Array (PLG84) package, with dimensions approximately 1.15 in × 1.15 in × 0.17 in. This hermetically sealed PGA variant is MIL-STD-883 qualified and explicitly listed in the "Pin Configurations" section of the datasheet. It differs from the PLCC, Flatpack, and TQFP variants offered in the broader IDT7024 family - confirming that the "J8" suffix in 7024S17J8 denotes the PLG84 ceramic PGA option.