Renesas 7027S25PFI

Overview

7027S25PFI 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, 25 ns maximum access time, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables error-free 32-bit-or-wider memory systems via MASTER/SLAVE cascading in real-time control and multiprocessing applications.

For engineers reviewing the 7027S25PFI datasheet, 7027S25PFI pinout, 7027S25PFI application, or 7027S25PFI equivalent, key selection criteria include bus-matching byte controls (UBL/LBL), on-chip semaphore arbitration, BUSY flag timing under M/S = VIH/VIL, dual chip enable depth expansion, and full asynchronous operation without external logic.

Technical Context

The 7027S25PFI implements fully independent left/right port control logic with separate CE0/CE1, R/W, OE, address, and I/O buses - enabling concurrent read/write operations to identical addresses only when BUSY arbitration resolves contention. Its on-chip hardware semaphore logic uses A0–A2 addressing to manage eight shared flags via I/O0 write and full I/O0–I/O15 read.

Arbitration operates via two modes: address-match-driven BUSY assertion (tBAA ≤ 20 ns) for master configuration (M/S = VIH), and chip-enable-driven arbitration (tBAC ≤ 20 ns); slave mode (M/S = VIL) accepts BUSY as input to inhibit writes, with tWB = 0 ns propagation. All I/Os are TTL-compatible push-pull outputs with VOH ≥ 2.4 V and VOL ≤ 0.4 V at ±4 mA.

Key Specifications

Pinout & Package

7027S25PFI 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; package includes dedicated power/ground pairs for noise suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC and IDT70V27L15PF, the 7027S25PFI uniquely delivers 25 ns performance with industrial temperature support and native 5 V operation - making it the optimal choice for retrofitting legacy industrial controllers and avionics platforms where voltage compatibility and environmental robustness are non-negotiable.

Availability

7027S25PFI is available at Aetrix Electronics and suitable for industrial motion control, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 7027S25PFI 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 timing, memory interface, RF, and sensor solutions, acquired by Renesas Electronics in 2019.

The IDT7027 family was designed specifically for deterministic inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, mailbox interrupts, and seamless 5 V bus integration without external logic.

FAQ

What is the maximum operating temperature range for the 7027S25PFI?

7027S25PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the DC and AC electrical characteristics tables in the official IDT datasheet DSC3199/12, and applies to all speed grades including the 25 ns version. The device uses CMOS process technology optimized for thermal stability across this full range.

Does the 7027S25PFI support true simultaneous access to the same memory address?

Yes, the 7027S25PFI implements true dual-port memory cells that permit simultaneous access to identical addresses. When contention occurs, on-chip arbitration asserts BUSY on the later-arriving port. In master mode (M/S = VIH), BUSY is an output; in slave mode (M/S = VIL), it is an input that inhibits writes - ensuring deterministic resolution without external logic.

How does the semaphore function work on the 7027S25PFI?

The 7027S25PFI provides eight hardware semaphore flags accessed via A0–A2 addressing. Writing to I/O0 while SEM = VIL and CE = VIH sets a flag; reading any I/O0–I/O15 returns the flag value. Truth Table VI in the datasheet defines token-passing sequences. This logic enables lock-free resource sharing between processors without software overhead or race conditions.

Can the 7027S25PFI be used in a 32-bit memory system?

Yes, the 7027S25PFI supports 32-bit-or-wider systems via MASTER/SLAVE cascading. When configured as master (M/S = VIH), BUSY is output; as slave (M/S = VIL), BUSY is input. Multiple devices can be stacked using CE0/CE1 and M/S to form wider data paths - e.g., two 7027S25PFI units yield 32K × 32 - with full-speed operation and no external logic.

What are the power consumption characteristics of the 7027S25PFI in standby mode?

In full standby (ISB3), the 7027S25PFI draws 1.0 mA typical (15 mA max) when both ports are disabled with CMOS-level inputs. With one port active and TTL-level inputs (ISB4), it consumes 100 mA typical (170 mA max). These values are measured at VCC = 5.0 V and TA = +25°C per Table 10a in the datasheet - enabling precise power budgeting for industrial systems.