Renesas 70V24L20PFGI

Overview

70V24L20PFGI from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 20 ns maximum access time, 3.3 V single supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous reads/writes, on-chip semaphore arbitration, and master/slave cascading for wider bus expansion - used in real-time DSP co-processing, network packet buffering, and FPGA-based control systems.

For engineers reviewing the 70V24L20PFGI datasheet, 70V24L20PFGI pinout, 70V24L20PFGI application, or 70V24L20PFGI equivalent, key selection criteria include dual-port timing symmetry, BUSY/INT flag behavior, byte-select granularity (UBL/LBL), CE-controlled power-down, and PLCC-84 package compatibility with legacy board layouts.

Technical Context

The 70V24L20PFGI implements fully asynchronous dual-port operation with separate address, data, and control buses per port. Its on-chip arbitration logic resolves contention via BUSY flag assertion and supports eight hardware semaphores addressed by A0–A2 for inter-processor synchronization.

It uses LVTTL-compatible I/Os with 3.3 V ±0.3 V supply, features non-tri-stated push-pull BUSY and INT outputs, and provides separate upper-byte (I/O8–I/O15) and lower-byte (I/O0–I/O7) control for multiplexed bus compatibility - enabling seamless integration into 16-bit microcontroller or FPGA memory interfaces.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLG84) package, body size ≈ 1.15 in × 1.15 in × 0.17 in, with through-hole mounting and internal heat slug. All VDD pins require local 3.3 V decoupling; all VSS pins must be connected to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-20ZXI and IDT70V25L20PF, the 70V24L20PFGI uniquely delivers industrial-grade PLCC-84 packaging with guaranteed 20 ns timing and hardware semaphore support - making it irreplaceable for legacy through-hole systems requiring minimal BOM change.

Availability

70V24L20PFGI is available at Aetrix Electronics and suitable for real-time DSP co-processing, network packet buffering, and industrial PLC I/O expansion requiring stable component supply across extended product lifecycles.

Supply support for 70V24L20PFGI 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas in 2019. Known for high-reliability industrial memory products.

The IDT70V24 family targets deterministic, low-latency memory sharing between heterogeneous processors - designed specifically for embedded control, telecom infrastructure, and test equipment where timing predictability and bus compatibility are critical.

FAQ

What is the maximum operating frequency supported by the 70V24L20PFGI?

The 70V24L20PFGI does not specify a clock frequency but guarantees 20 ns maximum access time (tAA) and 20 ns read cycle time (tRC) under industrial conditions. This corresponds to a theoretical maximum sustained throughput of ~50 MHz for consecutive accesses, assuming optimal control signal timing and no wait states - verified in AC Electrical Characteristics Table 11d for the 70V24X20 speed grade.

Does the 70V24L20PFGI support simultaneous read and write to the same memory location?

Yes, the 70V24L20PFGI implements true dual-port SRAM cells that allow simultaneous reads from the same address on both ports. However, simultaneous write-to-same-address is resolved via on-chip arbitration: the BUSY flag asserts to delay the later-arriving write until completion, preventing corruption - as defined in Truth Table I and Timing Waveform descriptions.

How is semaphore functionality implemented in the 70V24L20PFGI?

The 70V24L20PFGI integrates eight dedicated hardware semaphore flags accessible via A0–A2 address lines. When SEM = VIL and CE = VIH (or UB & LB = VIH), I/O0 writes to the selected flag; all I/O pins (I/O0–I/O15) read its value. This eliminates software polling and enables atomic lock/unlock operations - confirmed in Truth Table II and Pin Names table footnote 1.

What is the role of the M/S pin on the 70V24L20PFGI?

The M/S pin configures the 70V24L20PFGI as either master (M/S = VIH) or slave (M/S = VIL) in cascaded systems. In master mode, BUSYR is an output flag; in slave mode, BUSYR becomes an input that synchronizes write arbitration across multiple devices - per Functional Block Diagram note 2 and Pin Names table.

Can the 70V24L20PFGI operate with mixed voltage interfaces (e.g., 3.3 V core, 5 V I/O)?

No - the 70V24L20PFGI is strictly LVTTL-compatible with 3.3 V ±0.3 V supply and input thresholds defined for 3.3 V logic (VIH ≥ 2.0 V, VIL ≤ 0.8 V). Driving inputs above VDD + 0.3 V violates Absolute Maximum Ratings and risks permanent damage, as stated in Table 4 and Note 2 of Recommended DC Operating Conditions.