Renesas 7027L55PFI

Overview

IDT7027L55PFI from IDT (now Renesas) 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, 55 ns maximum access time, 1 mW typical standby power, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It serves as a stand-alone 512 Kbit dual-port SRAM or master/slave pair in 32-bit+ bus systems for real-time interprocessor communication.

For engineers reviewing the IDT7027L55PFI datasheet, IDT7027L55PFI pinout, IDT7027L55PFI application, or IDT7027L55PFI equivalent, key selection considerations include port arbitration timing (tBDD = 55 ns), BUSY flag behavior under M/S = VIH/VIL, semaphore flag update pulse (tSOP = 15 ns), and dual chip-enable support for depth expansion without external logic.

Technical Context

The IDT7027L55PFI 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-match or chip-enable timing, generating BUSY flags with tBAA ≤ 45 ns and tBDD ≤ 55 ns when configured as Master (M/S = VIH).

It supports semaphore signaling across eight flags addressed by A0–A2, with tSWRD = 5 ns SEM write-to-read latency and tSPS = 5 ns contention window. The device uses CMOS high-performance fabrication and features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) controls for flexible bus matching.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm; all VCC pins require connection to 5 V supply, all GND pins to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and IS61WV3216EBLL-10MI, the IDT7027L55PFI delivers native 5 V dual-port operation with integrated arbitration, semaphore, and M/S cascading - reducing system-level complexity and validation effort for industrial real-time interprocessor communication.

Availability

IDT7027L55PFI is available at Aetrix Electronics and suitable for industrial PLC communication, real-time motor control, and avionics data concentrators requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for IDT7027L55PFI 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, is a fabless semiconductor company specializing in timing, memory interface, and RF solutions for high-performance computing and communications.

The IDT7027L55PFI belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic interprocessor communication in industrial automation, aerospace, and medical imaging systems where hardware-enforced atomicity and low-latency access are mandatory.

FAQ

What is the maximum access time specification for IDT7027L55PFI?

The IDT7027L55PFI has a maximum access time of 55 ns under commercial and industrial temperature conditions, measured as tAA (address access time), tACE (chip enable access time), and tAOE (output enable access time). This value is guaranteed across the full operating range of –40°C to +85°C and 4.5 V to 5.5 V supply voltage, ensuring deterministic timing for real-time embedded applications.

How does the BUSY arbitration mechanism work in IDT7027L55PFI?

In IDT7027L55PFI, BUSY arbitration operates differently based on M/S pin state: when M/S = VIH (Master), BUSYL/BUSYR are outputs asserting on address or chip-enable match; when M/S = VIL (Slave), they become inputs that inhibit writes. The tBDD parameter (≤55 ns) defines the delay from BUSY assertion to valid read data, ensuring safe inter-port synchronization without software intervention.

Can IDT7027L55PFI be used in a 32-bit data path configuration?

Yes, IDT7027L55PFI supports 32-bit expansion via its Master/Slave cascading architecture. When two devices are connected with M/S = VIH on the master and M/S = VIL on the slave, the BUSY and INT signals coordinate access across both chips, enabling full 32-bit word transfers without external logic or timing penalties - a capability confirmed in the functional description and pin configuration diagrams.

What is the standby power consumption of IDT7027L55PFI?

IDT7027L55PFI consumes 1 mW typical standby power (ISB3 condition), corresponding to ~0.2 mA at 5 V, as specified in Table 10a for the "L" speed grade. This ultra-low quiescent current is achieved when both ports are fully deselected (CE > VCC − 0.2 V) and all inputs are at valid CMOS levels, making it suitable for always-on industrial monitoring nodes.

Does IDT7027L55PFI support byte-level write operations?

Yes, IDT7027L55PFI supports independent upper- and lower-byte writes via UBL/LBL (left port) and UBR/LBR (right port) control signals. When UB = L and LB = H, only upper-byte data (I/O8–I/O15) is written; when UB = H and LB = L, only lower-byte data (I/O0–I/O7) is written - enabling precise peripheral register updates without disturbing adjacent fields.