Renesas 7005S17J

Overview

7005S17J from IDT is a high-speed 8K × 8 (64 Kbit) true dual-port static RAM with independent left/right ports, 17 ns maximum access time (commercial grade), TTL-compatible 5 V ±10% supply, and on-chip semaphore/arbitration logic for inter-port synchronization - used in real-time embedded systems requiring concurrent memory access, such as digital signal processors interfacing with host controllers.

For engineers reviewing the 7005S17J datasheet, 7005S17J pinout, 7005S17J application, or 7005S17J equivalent, this page delivers verified electrical specs, dual-port timing behavior, BUSY/INT/SEM control semantics, package-confirmed pin mapping, and validated alternatives for master/slave memory expansion in industrial and communications equipment.

Technical Context

The 7005S17J implements fully asynchronous dual-port operation: each port (left/right) has dedicated address (A0L–A12L / A0R–A12R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, R/WL/R/WR, OEL/OER), enabling simultaneous reads to the same location without contention. It supports both RAM array access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW).

Hardware arbitration uses push-pull BUSY outputs (when M/S = HIGH) or BUSY inputs (M/S = LOW), with tAPS = 5 ns arbitration priority setup time and tBDD ≤ 18 ns busy-disable-to-valid-data delay. Interrupt flags (INTL/INTR) are set/cleared via dedicated addresses (1FFFh/1FFEh) and support edge-triggered signaling between ports.

Key Specifications

Pinout & Package

7005S17J is housed in a 64-pin thin quad flatpack (TQFP) with 0.5 mm pitch, JEDEC MO-159 compliant. All VCC pins require local decoupling; all GND pins must be connected to system ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15AXC and IDT70V25L15PF, the 7005S17J uniquely retains 5 V TTL compatibility, 17 ns commercial-grade speed, and 64-pin TQFP footprint - making it optimal for drop-in upgrades in legacy 5 V dual-processor systems without layout revision.

Availability

7005S17J is available at Aetrix Electronics and suitable for industrial automation controllers, telecommunications line cards, and embedded DSP co-processing systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 7005S17J 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 IDT7005 family was engineered for high-reliability dual-ported memory applications in real-time embedded systems - emphasizing deterministic arbitration, low-latency inter-processor communication, and seamless integration into 5 V legacy architectures.

FAQ

What is the maximum operating frequency supported by the 7005S17J?

The 7005S17J does not specify a clock frequency; it is an asynchronous SRAM. Its performance is defined by access timing: tRC (read cycle time) is 17 ns maximum, enabling effective throughput up to ~58.8 MHz in continuous read cycles. Write cycle time (tWC) is also 17 ns max, supporting matching write bandwidth without wait states.

Does the 7005S17J support battery backup for data retention?

The 7005S17J itself is the standard-power variant and does not guarantee data retention below 4.5 V. However, the pin-compatible IDT7005L series (e.g., 7005L17J) supports 2 V data retention with ≤5 µA standby current. For battery backup operation, the L-version must be selected - the S-version lacks optimized low-voltage retention circuitry.

How does the BUSY arbitration mechanism work in master vs. slave configuration for the 7005S17J?

When M/S = HIGH, the 7005S17J operates as master: BUSYL and BUSYR are push-pull outputs that assert LOW to block writes on the opposing port during address/contention. When M/S = LOW, it acts as slave: BUSYL/BUSYR become inputs, and external logic (e.g., another 7005S17J configured as master) drives them to control write permission - enabling hierarchical multi-device memory systems.

Can the 7005S17J be used in a 16-bit data bus configuration?

Yes - the 7005S17J supports 16-bit expansion via master/slave cascading. One device is configured as master (M/S = HIGH), another as slave (M/S = LOW). The M/S pin selects BUSY directionality, and the IDT MASTER/SLAVE architecture ensures full-speed, error-free 16-bit operation without external glue logic - as confirmed in the functional description and truth tables.

What are the valid interrupt address locations for setting and clearing INTL/INTR flags on the 7005S17J?

INTL and INTR flags are controlled via dedicated addresses: writing any value to address 1FFFh sets the opposite port's interrupt flag (e.g., left-port write to 1FFFh sets INTR), while writing to 1FFEh clears it. These addresses are fixed and decoded internally - no external decoding logic is needed, and the behavior is identical for both ports per Truth Table III.