Renesas 7028L15PF

Overview

7028L15PF from IDT (Integrated Device Technology) is a high-speed, 64K × 16-bit true dual-ported static RAM with independent left/right ports, 15 ns max access time (commercial grade), TTL-compatible 5V ±10% supply, and integrated hardware semaphore/arbiter logic for interprocessor communication. It enables simultaneous read/write to the same memory location and supports MASTER/SLAVE cascading for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7028L15PF datasheet, 7028L15PF pinout, 7028L15PF application, or 7028L15PF equivalent, this page delivers verified timing specs, dual-port arbitration behavior, BUSY/INT/SEM signal semantics, TQFP-100 package mapping, and validated alternatives for multi-processor shared-memory designs requiring deterministic latency and conflict-free resource handshaking.

Technical Context

The 7028L15PF implements fully asynchronous dual-port operation with separate address, data, and control buses per port - no internal clock required. Its on-chip arbitration logic 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.

Hardware semaphore functionality operates independently of the main memory array using eight dedicated latches addressed by A0–A2; access requires CE = VIH and SEM = VIL. Interrupt flags (INTL/INTR) are software-triggered via writes to fixed addresses FFFE_H (left port sets right INTR) and FFFF_H (right port sets left INTL), with no hardware dependency on BUSY state.

Key Specifications

Pinout & Package

7028L15PF is housed in a 100-pin TQFP (Thin Quad Flatpack) with 0.5 mm pitch, 14 mm × 14 mm body, and exposed thermal pad (not electrically connected). Pin numbering follows standard counter-clockwise convention from top-left corner (Pin 1 = GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-15ZXI and AS7C362000B-15TIN, the 7028L15PF uniquely integrates arbitration, semaphore, and interrupt logic in a single 5 V device - eliminating board space, BOM count, and timing uncertainty associated with external coordination circuitry.

Availability

7028L15PF is available at Aetrix Electronics and suitable for real-time multi-processor control, DSP co-processing, industrial PLC redundancy, and telecom packet buffering requiring stable component supply and long-term obsolescence management.

Supply support for 7028L15PF 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), now part of Renesas Electronics, specialized in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets before acquisition in 2019.

The 7028L15PF belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor communication in safety-critical and high-throughput embedded systems.

FAQ

What is the maximum operating temperature range supported by the 7028L15PF?

The 7028L15PF is specified for commercial temperature range only: 0°C to +70°C. It is not rated for industrial operation (−40°C to +85°C); that capability applies only to the 7028L20 variant. Using the 7028L15PF outside its rated range may cause timing violations or increased leakage current. Always verify ambient conditions against the 7028L15PF datasheet's Absolute Maximum Ratings table.

Does the 7028L15PF support true simultaneous read/write to the same memory address?

Yes, the 7028L15PF implements true dual-ported SRAM cells that allow concurrent reads from the same location on both ports without conflict. However, simultaneous write-to-write or read-to-write to the same address triggers BUSY arbitration - the 7028L15PF will permit one access and assert BUSY on the contending port to stall the second operation until completion.

How does the M/S pin affect BUSY pin functionality on the 7028L15PF?

When M/S = VIH, BUSYL and BUSYR operate as push-pull outputs indicating address contention; when M/S = VIL, they become inputs that inhibit writes when driven low. This lets the 7028L15PF function as either a master (driving BUSY signals) or slave (responding to external BUSY) in cascaded configurations - a key enabler for depth-expanded memory arrays.

Can the 7028L15PF's semaphore flags be used without enabling the main memory array?

Yes - semaphore access is decoupled from main memory operation. To use semaphores, set CE = VIH (port disabled) and SEM = VIL (semaphore enabled); address A0–A2 selects one of eight latches, and I/O0 writes the flag while all I/Os (I/O0–I/O15) read it. This allows token-passing coordination even when the 7028L15PF's RAM is powered down or unused.

What is the purpose of the INTL and INTR pins on the 7028L15PF, and how are they triggered?

INTL and INTR are non-tri-state totem-pole interrupt flags. INTL asserts when the right port writes to address FFFE_H; INTR asserts when the left port writes to FFFF_H. Both are cleared by reading those same addresses. These are software-defined mailbox triggers - the 7028L15PF does not auto-clear or auto-set them based on BUSY or semaphore state.