Renesas 7027L55PF8

Overview

IDT7027L55PF8 from IDT (Integrated Device Technology) is a high-speed 32K × 16 dual-port static RAM with true simultaneous access to the same memory location from independent left and right ports, 55 ns maximum access time, 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-or-wider memory systems for real-time inter-processor communication.

For engineers reviewing the IDT7027L55PF8 datasheet, IDT7027L55PF8 pinout, IDT7027L55PF8 application, or IDT7027L55PF8 equivalent, key selection criteria include port arbitration timing (tBDD ≤ 55 ns), BUSY flag behavior under M/S = VIH/VIL configuration, semaphore address mapping (A0–A2), low standby current (1 µA typical), and TQFP-100 package compatibility with board-level signal integrity constraints.

Technical Context

The IDT7027L55PF8 implements full on-chip hardware semaphore signaling using eight dedicated flags addressed by A0–A2, with read/write control via SEM and CE pins. Its arbitration logic resolves contention via address-match or chip-enable timing, generating BUSY outputs (push-pull, non-tri-state) that inhibit writes when asserted.

It supports asynchronous operation from either port, with separate upper-byte (UB/UBR) and lower-byte (LB/LBR) controls enabling flexible bus matching. The Master/Slave select (M/S) pin configures BUSY as output (VIH) or input (VIL), enabling depth expansion without external logic and supporting cascaded 32-bit+ word systems.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm; all VCC and GND pins require proper decoupling per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and R1EX24032AS0I-55, the IDT7027L55PF8 delivers integrated arbitration, hardware semaphores, and TQFP-100 packaging - reducing system-level BOM cost by eliminating discrete logic and enabling scalable 32-bit+ memory architectures.

Availability

IDT7027L55PF8 is available at Aetrix Electronics and suitable for real-time motion control, industrial PLC communication modules, avionics data concentrators, and digital signal processing co-processing applications requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT7027L55PF8 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 timing, memory interface, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7027L55PF8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in industrial automation, aerospace, and test equipment where hardware-enforced memory coherency is mandatory.

FAQ

What is the maximum operating temperature range for the IDT7027L55PF8?

The IDT7027L55PF8 is rated for industrial temperature operation from –40°C to +85°C, verified across all electrical parameters including access time (55 ns max), standby current (1 µA typ), and BUSY arbitration timing (tBDD ≤ 55 ns). This range is explicitly confirmed in the DC Electrical Characteristics table (Table 10a/b) and Absolute Maximum Ratings section of the official datasheet.

Does the IDT7027L55PF8 support true simultaneous read/write to the same memory address?

Yes, the IDT7027L55PF8 features true dual-ported memory cells enabling simultaneous access to the same memory location from left and right ports. When contention occurs, on-chip arbitration logic asserts BUSY to inhibit the later-arriving write, preserving data integrity - a capability confirmed in the Functional Block Diagram and Truth Table V (Address Bus Arbitration).

How does the M/S pin affect BUSY functionality in the IDT7027L55PF8?

When M/S = VIH, BUSYL and BUSYR operate as push-pull outputs indicating arbitration status; when M/S = VIL, they become inputs used by slave devices to wait for master-granted access. This dual-mode behavior is defined in Note 1 of the Pin Configurations section and validated in Timing Waveforms 11–13 for both M/S = VIH and M/S = VIL configurations.

What are the valid addresses for interrupt flag triggering in the IDT7027L55PF8?

The IDT7027L55PF8 uses fixed addresses 7FFEh (hex) to set the left-port interrupt flag (INTL) and 7FFFh (hex) to set the right-port flag (INTR), as specified in Truth Table IV - Interrupt Flag and the Functional Description section. These locations function as user-defined mailboxes when interrupts are enabled, and as standard SRAM otherwise.

Can the IDT7027L55PF8 be used in a 32-bit data path without external logic?

Yes, the IDT7027L55PF8 supports 32-bit expansion via its Master/Slave select (M/S) feature: two devices can be cascaded - one configured as Master (M/S = VIH) and the other as Slave (M/S = VIL) - enabling full-speed, error-free 32-bit word access without additional discrete logic, as detailed in the Features section and Figure 1 (Functional Block Diagram).