Renesas 7027L35PF8

Overview

7027L35PF8 from IDT (Integrated Device Technology) is a high-speed 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address, 35 ns maximum access time, 1 mW typical standby power, and full on-chip semaphore and BUSY arbitration logic - used in real-time interprocessor communication systems requiring deterministic data coherency.

For engineers reviewing the 7027L35PF8 datasheet, 7027L35PF8 pinout, 7027L35PF8 application, or 7027L35PF8 equivalent, key selection considerations include its 100-pin TQFP package, master/slave cascading capability for 32-bit+ bus expansion, industrial temperature range (–40°C to +85°C), and hardware-supported port arbitration without external logic.

Technical Context

The 7027L35PF8 implements fully asynchronous dual-port operation with independent left/right control, address, and I/O buses. Its on-chip arbitration logic resolves contention via address-matching or chip-enable timing, generating BUSY flags to inhibit conflicting writes - with tBDD delay ensuring valid data before read completion.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2 addressing of eight shared flags, while interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (7FFE_H/7FFF_H) - all operating under single 5V ±10% TTL-compatible supply.

Key Specifications

Pinout & Package

7027L35PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with exposed thermal pad (Pb-free, RoHS-compliant). Pin numbering follows standard counter-clockwise top-view convention starting at index corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-35AXC and AS7C33256P-35JCIN, the 7027L35PF8 uniquely delivers 5 V TTL compatibility, integrated BUSY/semaphore arbitration, and industrial temperature support in a pin-compatible 100-pin TQFP - making it irreplaceable in legacy 5 V interprocessor systems requiring hardware-enforced coherency.

Availability

7027L35PF8 is available at Aetrix Electronics and suitable for industrial motion control, telecom infrastructure, real-time interprocessor communication, and digital signal processing subsystems requiring stable component supply and long-term obsolescence management.

Supply support for 7027L35PF8 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The 7027L35PF8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency interprocessor communication in industrial and telecom systems where hardware arbitration eliminates software overhead and timing uncertainty.

FAQ

What is the operating voltage range for the 7027L35PF8?

The 7027L35PF8 operates from 4.5 V to 5.5 V (5.0 V ±10%). It is strictly a 5 V TTL-compatible device with no 3.3 V or mixed-voltage support. All input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V) are specified relative to this 5 V supply, and operation outside this range may cause functional failure or damage. The 7027L35PF8 does not support voltage scaling or dual-supply operation.

Does the 7027L35PF8 support true simultaneous access to the same memory location?

Yes, the 7027L35PF8 uses true dual-ported memory cells that allow concurrent read and write operations to the exact same address by left and right ports. When contention occurs, on-chip arbitration logic asserts BUSY on the later-arriving port to block the write - preserving data integrity without external logic. This behavior is confirmed in the Functional Block Diagram and Truth Table V, and is a defining feature of the 7027L35PF8 architecture.

How does the master/slave configuration work on the 7027L35PF8?

The M/S pin configures the 7027L35PF8 as either master (M/S = VIH) or slave (M/S = VIL). In master mode, BUSYL and BUSYR are push-pull outputs indicating port contention; in slave mode, they become inputs that inhibit local writes when driven low by a master. This enables daisy-chained arbitration across multiple devices - a capability explicitly documented in the "Master/Slave Select" section and timing diagrams for 7027L35PF8.

What is the purpose of the semaphore function in the 7027L35PF8?

The 7027L35PF8 includes eight hardware semaphore flags accessed via A0–A2 and controlled by SEML/SEMR. These flags provide atomic resource locking between ports: writing '0' to I/O0 acquires a flag, writing '1' releases it. This eliminates race conditions in shared-resource access (e.g., shared peripherals or memory regions) without CPU intervention - a capability verified in Truth Table VI and the Functional Description section for 7027L35PF8.

Is the 7027L35PF8 available in an industrial temperature grade?

Yes, the 7027L35PF8 is rated for the industrial temperature range of –40°C to +85°C, as confirmed in the "Features" section ("Industrial temperature range (–40°C to +85°C) is available for selected speeds") and DC Electrical Characteristics table (Grade column lists Industrial with corresponding TA limits). This qualification applies specifically to the 'L' speed grade (35 ns), making the 7027L35PF8 suitable for harsh-environment applications like factory automation and outdoor telecom equipment.