Renesas 70V27L20PFI8

Overview

IDT70V27L20PFI8 from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 20 ns maximum read cycle time (tRC), industrial temperature range (–40°C to +85°C), and ultra-low standby power of 660 μW (typ.). It serves as a master/slave-configurable memory buffer in real-time inter-processor communication systems.

For engineers reviewing the IDT70V27L20PFI8 datasheet, IDT70V27L20PFI8 pinout, IDT70V27L20PFI8 application, or IDT70V27L20PFI8 equivalent, key selection criteria include bus-matching byte controls (UBL/LBL), on-chip semaphore arbitration, BUSY/INT flag signaling, and TQFP-100 packaging compatible with 32-bit memory expansion architectures.

Technical Context

The IDT70V27L20PFI8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses - supporting concurrent read/write operations without external arbitration logic. Its on-chip port arbitration logic resolves contention via address-match or chip-enable timing, with BUSY outputs asserted in master mode (M/S = VIH) and accepted as inputs in slave mode (M/S = VIL).

It integrates full hardware semaphore support across eight flags (addressed by A0–A2), enabling atomic resource locking between ports. The device uses LVTTL-compatible 3.3V ±0.3V single-supply operation and features separate upper-byte (UB) and lower-byte (LB) enables for flexible data bus interfacing in mixed-width systems.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (PN100-1), 14 mm × 14 mm × 1.4 mm body, lead finish SnPb (EOL per June 2018 LTBD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and R1EX24032ASAS-20, the IDT70V27L20PFI8 uniquely delivers integrated semaphore arbitration, master/slave configuration, and 660 μW standby in a compact 100-pin TQFP - reducing BOM count and improving real-time determinism in safety-critical systems.

Availability

IDT70V27L20PFI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.

Supply support for IDT70V27L20PFI8 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

Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70V27L20PFI8 belongs to IDT's high-speed dual-port SRAM family, engineered specifically for deterministic, low-latency inter-processor data exchange in real-time embedded systems.

FAQ

What is the maximum operating frequency supported by the IDT70V27L20PFI8?

The IDT70V27L20PFI8 supports a maximum read cycle time (tRC) of 20 ns, corresponding to a theoretical maximum sustained access rate of 50 MHz per port. This is not a clocked interface - it operates asynchronously, so actual throughput depends on address/control setup/hold timing and bus turnaround. The 20 ns specification is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±0.3 V supply.

How does the BUSY arbitration mechanism work in the IDT70V27L20PFI8?

In master mode (M/S = VIH), the IDT70V27L20PFI8 asserts BUSYL or BUSYR when address contention occurs - i.e., both ports attempt access to the same memory location simultaneously. BUSY disables writes on the losing port until the winning port completes its cycle. In slave mode (M/S = VIL), BUSY is an input that must be driven externally to inhibit writes. The arbitration priority is determined by relative timing of address and enable signals, with tAPS (5 ns min) defining setup window for deterministic resolution.

Can the IDT70V27L20PFI8 be used in a 32-bit data bus configuration?

Yes - the IDT70V27L20PFI8 supports 32-bit expansion via master/slave cascading. When two devices are connected, the M/S pin configures one as master (BUSY output) and the other as slave (BUSY input). Using CE1L/CE1R and internal logic, the pair presents a unified 32K × 32 memory map without external decoding logic. This capability is explicitly documented in the functional description and pin configuration diagrams for IDT70V27L20PFI8.

What is the purpose of the semaphore function in the IDT70V27L20PFI8?

The IDT70V27L20PFI8 integrates eight hardware semaphore flags accessible via A0–A2 address lines and controlled by SEM pins. These flags enable atomic "test-and-set" operations between ports - allowing one port to claim exclusive access to a shared resource (e.g., a peripheral register or memory region) before the other port can proceed. This eliminates race conditions and replaces software-based mutexes with deterministic, zero-overhead hardware synchronization.

Does the IDT70V27L20PFI8 support partial-word writes?

Yes - the IDT70V27L20PFI8 provides independent upper-byte (UBL/UBR) and lower-byte (LBL/LBR) enable controls. When only UBL is active (and LBL inactive), writes affect only I/O8–I/O15; when only LBL is active, writes affect only I/O0–I/O7. This allows precise 8-bit updates within the 16-bit word without read-modify-write cycles - essential for interfacing with legacy 8-bit peripherals or packing multiple data fields into one memory location.