Renesas 70V25L25PF8

Overview

70V25L25PF8 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 access time (commercial grade), 3.3 V single-supply operation, and on-chip semaphore arbitration logic. It enables simultaneous read/write access to shared memory in real-time inter-processor communication systems such as telecom line cards and industrial PLCs.

For engineers reviewing the 70V25L25PF8 datasheet, 70V25L25PF8 pinout, 70V25L25PF8 application, or 70V25L25PF8 equivalent, key selection criteria include dual-port timing symmetry, BUSY/INT flag behavior, byte-select control for multiplexed bus compatibility, and low-power standby current (660 µA typ.) in L-version devices.

Technical Context

The 70V25L25PF8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling concurrent read/write operations without external arbitration logic. Its on-chip port arbitration resolves contention via BUSY flag assertion and supports master/slave cascading for 32-bit+ data width expansion.

It integrates full hardware semaphore signaling across both ports using A0–A2 address lines to select one of eight flags, with dedicated SEM enable pins and deterministic write-to-read latency (tSWRD = 5 ns). All I/Os are LVTTL-compatible and operate from a single 3.3 V ±0.3 V supply.

Key Specifications

Pinout & Package

70V25L25PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm, and exposed thermal pad (not electrically connected). Pin 1 is located at top-left corner (marking dot adjacent).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-25AXC and IDT70V24L25PF, the 70V25L25PF8 uniquely combines 100-pin TQFP packaging, M/S-configurable cascading, and 660 µA standby current - making it optimal for space-constrained, multi-device, low-power embedded systems requiring seamless bus-width scalability.

Availability

70V25L25PF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, medical imaging, and avionics applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 70V25L25PF8 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 power management ICs for communications, computing, and industrial markets.

The IDT70V25/24 family was designed specifically for high-reliability, real-time dual-processor systems requiring deterministic memory access, hardware arbitration, and low-power operation - targeting telecom line cards, PLCs, and embedded instrumentation.

FAQ

What is the maximum operating frequency supported by the 70V25L25PF8?

The 70V25L25PF8 does not specify a maximum clock frequency because it is an asynchronous SRAM. Its performance is defined by timing parameters: 25 ns maximum access time (tAA, tACE, tABE) and 25 ns read cycle time (tRC) under commercial conditions. System-level throughput depends on external controller timing margins and bus protocol - not an internal clock.

Does the 70V25L25PF8 support simultaneous read and write to the same memory location?

Yes, the 70V25L25PF8 supports true simultaneous access to the same address - but only as read-from-both-ports. A simultaneous read and write to the same location triggers port arbitration: the BUSY flag asserts on the contending port, and the write completes only after BUSY deasserts. This prevents data corruption while maintaining deterministic behavior.

How is the semaphore function implemented in the 70V25L25PF8?

The 70V25L25PF8 implements eight hardware semaphore flags accessed via A0–A2 address lines. When SEM is low (active), writes to I/O0 set the flag; reads return the flag state across all I/O lines (I/O0–I/O15). The tSWRD parameter (5 ns) guarantees minimum delay between flag write and subsequent read visibility - enabling fast, lock-free synchronization.

What is the role of the M/S pin in 70V25L25PF8 system design?

The M/S pin configures the 70V25L25PF8 as either Master (M/S = VIH → BUSY is output) or Slave (M/S = VIL → BUSY is input). In cascaded configurations, one Master drives BUSY to multiple Slaves, enabling coordinated access to wider memory arrays (e.g., 32-bit) without external logic - simplifying PCB layout and reducing BOM count.

Can the 70V25L25PF8 operate with mixed voltage interfaces (e.g., 3.3 V core, 1.8 V I/O)?

No - the 70V25L25PF8 requires a single 3.3 V ±0.3 V supply (VDD) for all functions. Its inputs are LVTTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and outputs swing rail-to-rail (VOH ≥ 2.4 V, VOL ≤ 0.4 V). Direct interfacing with 1.8 V logic requires level-shifting circuitry; the device itself has no multi-voltage I/O capability.