Renesas 70V38L20PFGI8

Overview

70V38L20PFGI8 from Integrated Device Technology is a high-speed 3.3V 64K × 18 true dual-port static RAM with independent left/right ports, 20 ns max access time (industrial grade), LVTTL-compatible I/O, and on-chip semaphore/arbiter logic for multi-processor synchronization. It enables simultaneous read/write to the same memory location in master/slave or stand-alone configurations, used in real-time embedded control systems requiring deterministic inter-processor communication.

For engineers reviewing the 70V38L20PFGI8 datasheet, 70V38L20PFGI8 pinout, 70V38L20PFGI8 application, or 70V38L20PFGI8 equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = VIH/VIL, semaphore update pulse width (tSOP = 10 ns), and industrial-grade 20 ns access across –40°C to +85°C.

Technical Context

The 70V38L20PFGI8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port - no shared timing constraints between left and right sides. Its hardware arbitration uses push-pull BUSY outputs (not open-drain) and supports both master-mode (BUSY as output) and slave-mode (BUSY as write-inhibit input) via the M/S pin.

On-chip semaphore logic provides eight dedicated binary flags (addressed by A0–A2), accessible only when CE = VIH and SEM = VIL, with tSWRD = 5 ns write-to-read latency and tSPS = 5 ns contention window. Interrupt flags (INTL/INTR) are triggered by writes to FFFE_H (left) or FFFF_H (right), with tINS/tINR ≤ 20 ns.

Key Specifications

Pinout & Package

70V38L20PFGI8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body, and exposed thermal pad (not electrically connected). Pin numbering follows standard counter-clockwise top-view layout starting at pin 1 (OER) in bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1372KV18 and IDT70V27L25PFGI, the 70V38L20PFGI8 uniquely delivers industrial-grade 20 ns timing with integrated semaphore and BUSY logic in a 64K × 18 configuration - eliminating external arbitration components while supporting full-temperature operation in safety-critical systems.

Availability

70V38L20PFGI8 is available at Aetrix Electronics and suitable for real-time multi-processor control, digital signal processing co-processing, and industrial PLC communication bridge applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V38L20PFGI8 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 real-time interconnect solutions for communications, computing, and industrial markets.

The 70V38L20PFGI8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and semaphore support reduce software complexity and improve system predictability.

FAQ

What is the operating temperature range certified for the 70V38L20PFGI8?

The 70V38L20PFGI8 is specified for industrial temperature operation from –40°C to +85°C, validated per its Absolute Maximum Ratings and DC/AC Electrical Characteristics tables. This rating applies to all timing parameters including tAA = 20 ns max, tAPS = 5 ns, and tSOP = 10 ns, ensuring reliable performance in harsh environments without derating.

How does the BUSY arbitration logic function in master versus slave mode on the 70V38L20PFGI8?

In master mode (M/S = VIH), BUSYL and BUSYR are push-pull outputs that assert when address contention occurs, stalling the delayed port's write. In slave mode (M/S = VIL), they become write-inhibit inputs - tying BUSYL low blocks left-port writes regardless of CE/R/W state. The 70V38L20PFGI8 requires no external pull-ups in either configuration.

Can the 70V38L20PFGI8 be used for 36-bit or wider data bus expansion, and how is it implemented?

Yes - the 70V38L20PFGI8 supports 36-bit+ expansion via its Master/Slave cascading architecture. One device operates as master (M/S = VIH), others as slaves (M/S = VIL); shared address/control lines with independent CE0/CE1 enable full-speed operation without added logic. The 70V38L20PFGI8's dual CE per port and UBL/LBL controls ensure byte-aligned data routing.

What are the electrical requirements for accessing the semaphore flags on the 70V38L20PFGI8?

Semaphore access requires CE = VIH and SEM = VIL (per Truth Table III), with A0–A2 selecting one of eight flags. I/O0 writes the flag value; all I/Os (I/O0–I/O17) read it back. Timing mandates tSOP = 10 ns pulse width and tSWRD = 5 ns write-to-read latency. Voltage levels follow standard LVTTL: VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 3.3 V.

Does the 70V38L20PFGI8 support power-down modes, and what are the typical current draws?

Yes - the 70V38L20PFGI8 offers four standby modes. Full standby (both ports CMOS-inactive) draws 0.2 mA typ (3.0 mA max). Partial standby (one port active) draws 90 mA typ (140 mA max, industrial). Active mode draws 135 mA typ (205 mA max) at fMAX. Power-down is controlled independently per port via CE0/CE1 assertion.