Renesas 70V25L15J

Overview

IDT70V25L15J from Integrated Device Technology is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 15 ns read cycle time (commercial/industrial), 3.3 V single-supply operation, and on-chip semaphore arbitration-designed for real-time inter-processor communication in embedded control systems.

For engineers reviewing the IDT70V25L15J datasheet, IDT70V25L15J pinout, IDT70V25L15J application, or IDT70V25L15J equivalent, key selection criteria include simultaneous asynchronous access capability, BUSY/INT flag signaling, byte-selectable I/O control, low-power standby (660 µW typ.), and TQFP-100 packaging compatible with industrial temperature range (–40°C to +85°C).

Technical Context

The IDT70V25L15J implements fully asynchronous dual-port architecture with separate address, control, and data buses per port, enabling concurrent read/write operations-even to the same memory location-without external arbitration logic. Its on-chip port arbitration resolves contention via hardware BUSY flag assertion and supports master/slave cascading for wider bus expansion.

It integrates full semaphore logic with eight dedicated flags accessible via A0–A2, supporting atomic read-modify-write operations across ports. All control signals-including CE, R/W, OE, UB/LB, and SEM-are TTL-compatible and operate at 3.3 V ±0.3 V, with output drivers rated for ±4 mA drive strength and 0.4 V VOL / 2.4 V VOH levels.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant green variant available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15AXC and AS7C34096A-15JC, the IDT70V25L15J uniquely delivers integrated semaphore addressing, master/slave pin configuration, and guaranteed simultaneous read/write access-making it the only option among the three that eliminates external arbitration components in tightly coupled multi-processor designs.

Availability

IDT70V25L15J is available at Aetrix Electronics and suitable for industrial PLC communication, real-time DSP co-processing, avionics data concentrators, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.

Supply support for IDT70V25L15J 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance computing solutions.

The IDT70V25L15J belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in safety-critical industrial and aerospace systems where latency, reliability, and hardware-level synchronization are mandatory.

FAQ

What is the maximum operating frequency supported by the IDT70V25L15J?

The IDT70V25L15J supports a 15 ns read cycle time (tRC), enabling reliable operation at up to 66.7 MHz in commercial and industrial temperature ranges. This timing is guaranteed under VDD = 3.3 V ±0.3 V and applies to both ports independently. The device does not require clock input-it operates asynchronously, so maximum throughput depends on system-level control signal timing margins rather than a fixed clock frequency. Real-world sustained bandwidth exceeds 100 MB/s when both ports are active.

Does the IDT70V25L15J support simultaneous write operations to the same memory address from both ports?

No-the IDT70V25L15J prevents data corruption during simultaneous writes to the same address using hardware arbitration. When contention occurs, the BUSY flag asserts on the requesting port, halting the write until the other port completes its access. This behavior is documented in Truth Table I and the BUSY timing diagrams. The IDT70V25L15J guarantees safe concurrent reads to the same location, but writes require explicit coordination via semaphore flags or BUSY polling.

How is semaphore functionality implemented in the IDT70V25L15J?

The IDT70V25L15J implements eight hardware semaphore flags accessible via A0–A2 address lines and controlled by the SEM pin. When SEM = VIL and CE = VIH (or UB & LB = VIH), the I/O pins reflect the current semaphore state; writing to I/O0 updates the selected flag. This logic operates independently per port and requires no external logic. The tSWRD parameter (5 ns min.) defines the minimum delay between semaphore write and subsequent read, ensuring atomicity across ports.

What is the function of the M/S pin on the IDT70V25L15J?

The M/S (Master/Slave) pin configures the IDT70V25L15J for cascaded multi-device systems. When M/S = VIH, the device operates as a master: BUSY is an output that signals arbitration status to downstream slaves. When M/S = VIL, it operates as a slave: BUSY becomes an input accepting handshake signals from the master. This enables seamless 32-bit+ bus expansion using multiple IDT70V25L15J units without external control logic-documented in the functional block diagram and pin description table.

Can the IDT70V25L15J operate with mixed voltage interfaces (e.g., 3.3 V core with 1.8 V I/O)?

No-the IDT70V25L15J is strictly a 3.3 V LVTTL-compatible device. All inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V, and outputs drive to VOH ≥ 2.4 V and VOL ≤ 0.4 V under ±4 mA load. It does not support mixed-voltage operation or level translation. Interfacing with 1.8 V logic requires external voltage translators or bus switches; the IDT70V25L15J itself has no built-in I/O voltage flexibility.