Renesas 70V24L25PF

Overview

70V24L25PF from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 25 ns maximum read cycle time, 3.3 V ±0.3 V single supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous read/write access, on-chip semaphore arbitration, and master/slave cascading for wider bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 70V24L25PF datasheet, 70V24L25PF pinout, 70V24L25PF application, or 70V24L25PF equivalent, key selection criteria include its 84-pin PLCC package, low standby current (660 µW typ.), BUSY/INT flag signaling, LVTTL-compatible I/O, and full hardware semaphore support for lock-free resource sharing between heterogeneous processors.

Technical Context

The 70V24L25PF implements fully asynchronous dual-port architecture with separate address, control, and data buses per port-enabling concurrent access without external arbitration logic. Its on-chip arbitration resolves port contention via BUSY flag assertion and supports semaphore read/write operations using A0–A2 addressing and SEM enable.

It operates exclusively at 3.3 V with TTL-level input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), features non-tri-stated push-pull BUSY and INT outputs, and uses dedicated upper/lower byte enables (UB/LB) for multiplexed bus compatibility. A12 is no-connect per datasheet Note 1.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLG84) package with 1.15 in × 1.15 in body size and 0.17 in height. All VDD pins require 3.3 V supply connection; 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, the 70V24L25PF enables lower-power 3.3 V operation and hardware semaphore coherency; versus IDT70V25L25PF, it offers identical performance in a smaller, through-hole-compatible PLCC package - critical for ruggedized or legacy-compatible deployments.

Availability

70V24L25PF is available at Aetrix Electronics and suitable for industrial PLC communication buffers, avionics flight control data exchange, and medical imaging real-time FIFOs requiring stable component supply across extended product lifecycles.

Supply support for 70V24L25PF 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs, acquired by Renesas in 2019.

The IDT70V24 family delivers high-speed, low-power dual-port SRAMs optimized for real-time inter-processor communication in industrial control, aerospace, and medical systems requiring deterministic latency and hardware-enforced resource sharing.

FAQ

What is the maximum operating frequency supported by the 70V24L25PF?

The 70V24L25PF has a 25 ns maximum read cycle time (tRC), supporting up to 40 MHz sustained operation per port. This timing applies across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply, with no derating required. The device does not use a clock input - its asynchronous design relies on setup/hold timing of CE, R/W, and address signals rather than a system clock frequency.

Does the 70V24L25PF support hardware semaphore functionality, and how is it accessed?

Yes, the 70V24L25PF includes full on-chip hardware semaphore logic with eight dedicated flags. Semaphores are accessed by setting SEMx = VIL (low), asserting CE = VIH or both UB and LB = VIH, and using A0–A2 to select the flag. I/O0 writes the flag value; all I/O pins (I/O0–I/O15) read the flag value. The tSOP pulse width is 10 ns minimum, and tSAA access time is 25 ns max.

What is the role of the M/S pin on the 70V24L25PF, and how does it affect BUSY behavior?

The M/S pin configures the 70V24L25PF as master (M/S = VIH) or slave (M/S = VIL) in cascaded dual-port systems. In master mode, BUSYL/BUSYR are outputs that assert when local port access conflicts with remote port activity. In slave mode, BUSYL/BUSYR become inputs - allowing the master to drive BUSY state and coordinate arbitration across multiple devices for 32-bit+ bus expansion.

Can the 70V24L25PF operate with mixed voltage interfaces, such as 3.3 V core and 1.8 V I/O?

No, the 70V24L25PF requires a single 3.3 V ±0.3 V supply (VDD) and is LVTTL-compatible only. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V at ±4 mA) are specified strictly for 3.3 V operation. Interfacing with 1.8 V logic requires external level translators - the device has no built-in voltage translation or multi-rail support.

Is A12 used as an address pin on the 70V24L25PF?

No, A12L and A12R are no-connect (NC) pins on the 70V24L25PF, as confirmed in the datasheet Notes section (Note 1: "A12 is a NC for IDT70V24"). The device implements only 12 address bits per port (A0L–A11L and A0R–A11R), sufficient for its 4K × 16 organization. These pins must remain unconnected and should not be tied to VDD, VSS, or any control signal.