Renesas 7009L20PFGI

Overview

7009L20PFGI from IDT is a high-speed 128K × 8 true dual-ported static RAM with independent left/right ports, 20 ns max access time (industrial grade), TTL-compatible 5 V ±10% supply, and integrated hardware semaphore/INT/BUSY arbitration logic. It enables simultaneous read/write to same memory location in real-time interprocessor communication systems.

For engineers reviewing the 7009L20PFGI datasheet, 7009L20PFGI pinout, 7009L20PFGI application, or 7009L20PFGI equivalent, this device supports deterministic port-to-port synchronization in multi-CPU embedded control, industrial PLC backplanes, and high-throughput data acquisition where bus contention avoidance and mailbox-style interrupt signaling are required.

Technical Context

The 7009L20PFGI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no shared timing constraints between left (L) and right (R) sides. Its on-chip arbitration logic resolves simultaneous accesses via push-pull BUSY flag assertion (M/S = VIH) or BUSY input gating (M/S = VIL), with tBDD ≤ 17 ns propagation delay for port-to-port write-read coordination.

Hardware semaphore functionality uses dedicated A0–A2-addressed latches (8 flags) accessed via CE = VIH / SEM = VIL, enabling token-passing resource locking without software overhead. Interrupt flags (INTL/INTR) are triggered by writes to fixed addresses 1FFFEh (left sets right INT) and 1FFFFh (right sets left INT), with tINS/tINR ≤ 20 ns timing.

Key Specifications

Pinout & Package

7009L20PFGI is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet Note 1–2; NC pins are not internally bonded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-200BAXI and IS61WV1288EBLL-20NLI, the 7009L20PFGI uniquely integrates asynchronous dual-port access, hardware semaphore latches, and configurable BUSY arbitration in a single 100-pin TQFP - eliminating external logic while guaranteeing sub-20 ns deterministic interprocessor handshaking.

Availability

7009L20PFGI is available at Aetrix Electronics and suitable for industrial PLC backplanes, real-time multi-CPU control systems, and avionics data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7009L20PFGI 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

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in high-performance memory, timing, and interconnect solutions for communications, computing, and industrial markets.

The 7009L20PFGI belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor communication in safety-critical and real-time embedded systems.

FAQ

What is the maximum operating temperature range certified for the 7009L20PFGI?

7009L20PFGI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per datasheet Table 3 and applies to all AC/DC electrical parameters including 20 ns access time, BUSY arbitration timing, and semaphore functionality - no derating required within this range.

How does the M/S pin affect BUSY pin behavior in the 7009L20PFGI?

When M/S = VIH, BUSYL and BUSYR operate as push-pull outputs that assert LOW during address contention to stall the losing port. When M/S = VIL, both BUSY pins become inputs that must be driven externally to inhibit writes - enabling master/slave cascading without external AND gates. This dual-mode behavior is intrinsic to 7009L20PFGI's arbitration architecture.

Can the 7009L20PFGI perform simultaneous reads from both ports to the same memory address?

Yes - the 7009L20PFGI uses true dual-ported memory cells that permit concurrent reads to identical addresses on left and right ports with no timing penalty or BUSY assertion. This capability is explicitly guaranteed in the Functional Description section and enables mirrored register access in redundant control systems.

What addresses trigger interrupt flags INTL and INTR in the 7009L20PFGI?

INTL is asserted when the right port writes to address 1FFFEh (hex); INTR is asserted when the left port writes to address 1FFFFh (hex). Both interrupts are cleared by reading the same address - e.g., reading 1FFFEh clears INTL. These mailbox addresses are fixed and cannot be remapped in the 7009L20PFGI.

Does the 7009L20PFGI require external pull-up resistors on BUSY or INT pins?

No - BUSYL, BUSYR, INTL, and INTR are push-pull outputs in the 7009L20PFGI, as confirmed in Notes 1–2 of the Functional Block Diagram and Truth Table IV. External pull-ups are unnecessary and may cause contention; direct connection to CMOS inputs is supported.