Renesas 70V26L25J8

Overview

70V26L25J8 from Integrated Device Technology is a high-speed 3.3V 16K × 16 true dual-port static RAM with 25 ns maximum access time, 660 µW standby power, and integrated hardware semaphore logic for inter-processor resource coordination in real-time embedded systems.

For engineers reviewing the 70V26L25J8 datasheet, 70V26L25J8 pinout, 70V26L25J8 application, or 70V26L25J8 equivalent, this device supports simultaneous asynchronous reads/writes on independent left/right ports, full port arbitration, byte-selectable I/O, and MASTER/SLAVE cascading for 32-bit+ memory expansion without external logic.

Technical Context

The 70V26L25J8 implements fully asynchronous dual-port operation with separate address, control, and bidirectional data buses per port. Its on-chip arbitration logic resolves contention via BUSY flag assertion based on address match or chip enable timing, with configurable MASTER (BUSY output) or SLAVE (BUSY input) mode via M/S pin.

Hardware semaphore functionality operates in a dedicated 3-bit address space (A0–A2), enabling eight independent token-passing latches accessible only when SEM = VIL and CE = VIH. Semaphore read/write timing is decoupled from main memory access, with tSAA ≤ 35 ns and tSOP = 15 ns.

Key Specifications

Pinout & Package

70V26L25J8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package measuring approximately 1.15 in × 1.15 in × 0.17 in. All VDD pins require connection to 3.3 V supply; all VSS pins must be grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-25JC and AS7C3256B-25JC, the 70V26L25J8 uniquely delivers 16K × 16 density at 25 ns with 3.3 V operation and integrated semaphores - making it optimal for new industrial and avionics designs requiring deterministic low-latency inter-processor communication.

Availability

70V26L25J8 is available at Aetrix Electronics and suitable for industrial PLC backplane interconnect, real-time avionics data buffering, and medical imaging frame store applications requiring stable component supply across extended production lifecycles.

Supply support for 70V26L25J8 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, and RF solutions for high-performance computing and communications.

The 70V26L25J8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for real-time multiprocessing systems requiring hardware-coordinated shared memory access without CPU overhead.

FAQ

What is the operating voltage range for the 70V26L25J8?

The 70V26L25J8 operates from 3.0 V to 3.6 V, with nominal 3.3 V ± 0.3 V specified. It is TTL-compatible and requires no external level shifters when interfaced with 3.3 V logic families. Operation outside this range may cause functional failure or permanent damage, as defined in the absolute maximum ratings table of the official datasheet.

Does the 70V26L25J8 support simultaneous read operations on both ports to the same memory location?

Yes, the 70V26L25J8 supports true simultaneous reads to the same memory location on both left and right ports without contention or BUSY assertion. This behavior is explicitly guaranteed in the functional description and truth tables, distinguishing it from pseudo-dual-port devices that restrict concurrent access.

How does the semaphore function work in the 70V26L25J8?

The 70V26L25J8 contains eight independent semaphore latches accessed via A0–A2 when SEM = VIL and CE = VIH. Writing '0' requests the token; writing '1' releases it. Semaphores reside in a separate address space from main memory and support atomic set/test sequences to coordinate resource access between processors without software arbitration overhead.

What is the difference between the 'S' and 'L' suffixes in the 70V26 family?

The 'S' denotes standard power (3.3 mW standby), while 'L' indicates low-power operation (660 µW standby). Both variants share identical timing (e.g., 70V26L25J8 and 70V26S25J8 both have 25 ns access), pinout, and feature set - differing only in quiescent current consumption under full standby conditions.

Can the 70V26L25J8 be used in MASTER/SLAVE configurations for 32-bit data bus expansion?

Yes, the 70V26L25J8 supports width expansion using the M/S pin: one device configured as MASTER (M/S = VIH) provides BUSY arbitration output, while others configured as SLAVE (M/S = VIL) accept BUSY as a write-inhibit input. This enables seamless 32-bit-or-wider memory interfaces without external logic or timing penalties.