Renesas 7027S35PF

Overview

7027S35PF 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 (commercial grade), TTL-compatible 5 V ±10% supply, and integrated hardware semaphore and BUSY arbitration logic. It serves as a stand-alone or master/slave cascaded memory in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 7027S35PF datasheet, 7027S35PF pinout, 7027S35PF application, or 7027S35PF equivalent, key selection considerations include its 100-pin TQFP package, dual independent asynchronous ports with separate CE/R/W/OE controls, on-chip port arbitration, and support for 32-bit-or-wider bus expansion via MASTER/SLAVE configuration.

Technical Context

The 7027S35PF implements fully asynchronous dual-port operation with independent left/right address buses (A0L–A14L / A0R–A14R), control sets (CE0L/CE1L/R/WL/OEL vs. CE0R/CE1R/R/WR/OER), and 16-bit bidirectional I/O banks. Its on-chip arbitration logic resolves contention using either address-match detection (M/S = VIH) or chip-enable timing (M/S = VIL), generating BUSY flags to stall conflicting writes.

Hardware semaphore signaling operates across eight dedicated flags addressed by A0–A2, written via I/O0 and readable on all 16 I/O lines, enabling lock-step synchronization between processors without external logic. The device supports byte-selectable access (UBL/LBR, UBL/LBL) and full standby power-down modes controlled independently per port via CE0/CE1 levels.

Key Specifications

Pinout & Package

7027S35PF is housed in a 100-pin TQFP (Thin Quad Flatpack) package measuring approximately 14 mm × 14 mm × 1.4 mm. All VCC pins require connection to 5 V supply; all GND pins must be tied to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC and IDT70V27L15PF, the 7027S35PF uniquely maintains 5 V TTL compatibility, commercial temperature range, and proven field reliability in legacy industrial systems-making it the sole drop-in option for 5 V dual-processor upgrades without board rework.

Availability

7027S35PF is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, dual-core DSP subsystems, and avionics interfaces requiring stable component supply over extended production lifecycles.

Supply support for 7027S35PF 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 high-performance timing, memory, and interface ICs before its acquisition by Renesas Electronics in 2019.

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

FAQ

What is the maximum operating frequency supported by the 7027S35PF?

The 7027S35PF does not specify a clock frequency because it is an asynchronous SRAM. Its performance is defined by access time: 35 ns maximum read cycle time (tRC) at 5 V and 0°C to +70°C. This corresponds to a theoretical maximum sustained throughput of ~28.6 MHz for consecutive accesses, but actual system speed depends on controller timing margins and bus protocol overhead. The 7027S35PF requires no external clock signal.

Does the 7027S35PF support both master and slave configurations in the same system?

Yes, the 7027S35PF supports configurable master/slave operation via the M/S pin. When M/S = VIH, BUSYL and BUSYR function as push-pull outputs asserting busy during contention; when M/S = VIL, they become inputs accepting busy signals from upstream masters. This enables daisy-chained configurations-for example, one 7027S35PF as master driving BUSY to a second 7027S35PF configured as slave-without external logic.

How does the semaphore functionality work on the 7027S35PF?

The 7027S35PF implements eight hardware semaphore flags accessed by setting A0–A2 to select a flag (0–7), then writing to I/O0 while CE = VIH and SEM = VIL. All 16 I/O lines reflect the flag value on read. Semaphores operate independently of main memory-no address collision risk-and provide atomic set/clear operations essential for lock-free inter-processor synchronization in real-time systems using the 7027S35PF.

Can the 7027S35PF be used in a 3.3 V system?

No, the 7027S35PF is specified only for 5.0 V ±10% operation (4.5 V to 5.5 V). Its input thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and output drive strength are optimized for TTL-level signaling. Applying 3.3 V to VCC violates absolute maximum ratings and will cause functional failure. For 3.3 V systems, consider the IDT70V27L series or Cypress CY7C028V, which are not pin-compatible with the 7027S35PF.

What is the purpose of the CE0 and CE1 pins on the 7027S35PF?

The CE0L/CE1L and CE0R/CE1R pins provide hierarchical chip enable control per port. CE0 and CE1 combinations determine operational state: CE0 = VIL/CE1 = VIH selects the port; CE0 = VIH/CE1 = VIH places it in TTL-level standby (ISB1); CE0 > VCC−0.2 V/CE1 > VCC−0.2 V forces full CMOS standby (ISB3 ≈ 0.2 mA). This enables fine-grained power management-e.g., idling one port while the other remains active-extending battery life in portable dual-processor systems using the 7027S35PF.