Renesas 7025L20PFGI

Overview

7025L20PFGI from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent left/right ports, 20 ns max read cycle time, 1 mA typical standby current, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7025L20PFGI datasheet, 7025L20PFGI pinout, 7025L20PFGI application, or 7025L20PFGI equivalent, key selection criteria include dual-port arbitration latency, BUSY/INT flag timing, semaphore coherency under contention, battery backup data retention at 2V, and compatibility with TTL-level 5V ±10% supply.

Technical Context

The 7025L20PFGI implements fully asynchronous dual-port operation with on-chip port arbitration logic and hardware semaphore signaling across eight flags addressed via A0–A2. Its BUSY flag behavior depends on M/S pin state: when M/S = H, BUSY is an output indicating address/contention conflict; when M/S = L, BUSY serves as an input to block write operations on slave devices.

It supports two distinct memory access modes - standard RAM access (CE = VIL, UB/LB = VIL, SEM = VIH) and semaphore register access (CE = VIH or UB&LB = VIH, SEM = VIL) - with separate timing specifications for each, including tSAA (semaphore address access) ≤20 ns and tSWRD (semaphore write-to-read) = 5 ns.

Key Specifications

Pinout & Package

7025L20PFGI is housed in a 100-pin TQFP (PNG100) package with 0.5 mm pitch, compliant with JEDEC MO-158. Pin assignments follow symmetric dual-port layout: left port (L) and right port (R) each have dedicated address (A0L–A12L / A0R–A12R), data (I/O0L–I/O15L / I/O0R–I/O15R), and control (CEL/CER, R/WL/R/WR, OEL/OER, UBL/UBR, LBL/LBR) signals, plus shared M/S, INTL/INTR, BUSYL/BUSYR, SEML/SEMR, and power/ground pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-200BZXI and AS7C3256A-20JIN, the 7025L20PFGI uniquely delivers deterministic hardware semaphore coherency, 2V battery retention, and industrial-grade dual-port timing - making it irreplaceable in safety-critical real-time control where software arbitration introduces unacceptable jitter.

Availability

7025L20PFGI is available at Aetrix Electronics and suitable for motor control systems, avionics data recorders, and industrial PLC backplanes requiring stable component supply across extended product lifecycles.

Supply support for 7025L20PFGI 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 timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The 7025L20PFGI belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic real-time embedded systems requiring zero-software-overhead memory sharing between heterogeneous processors.

FAQ

What is the guaranteed data retention voltage for 7025L20PFGI?

The 7025L20PFGI guarantees data retention at VCC = 2.0 V minimum, with ICCDR ≤ 4000 µA across the full industrial temperature range. This specification is validated per IDT DSC 2683/13 and enables reliable operation during brownout conditions or battery-backed hold modes without external supervision circuitry. The 7025L20PFGI maintains stored contents indefinitely at this voltage provided CE remains asserted.

How does the M/S pin affect BUSY flag behavior in 7025L20PFGI?

In the 7025L20PFGI, the M/S pin configures BUSY as an output (M/S = H) for master devices asserting contention status, or as an input (M/S = L) for slave devices that halt writes upon BUSY assertion. This dual-role design enables automatic handshake in cascaded configurations - for example, when two 7025L20PFGI devices are linked, the master's BUSYR drives the slave's BUSYL to prevent conflicting writes. The timing tWB = 0 ns ensures immediate response.

Can 7025L20PFGI support simultaneous read and write to the same address?

Yes - the 7025L20PFGI's true dual-port architecture permits simultaneous read and write to identical addresses, but only if ports access different bytes (e.g., left port writes upper byte while right port reads lower byte). If both ports target the same byte, the BUSY flag activates to serialize access. This behavior is hardware-enforced with tBDD ≤ 30 ns, ensuring deterministic resolution without software intervention - a core capability confirmed in Truth Table I and Waveform 13.

What are the timing requirements for accessing semaphore registers in 7025L20PFGI?

Semaphore access in the 7025L20PFGI requires CE = VIH (or UB&LB = VIH) and SEM = VIL, with address A0–A2 selecting one of eight flags. Key timing parameters are tSAA ≤ 20 ns (address setup) and tSWRD = 5 ns (write-to-read delay), ensuring rapid inter-processor signaling. Unlike RAM access, semaphore reads return data on all 16 I/O lines simultaneously, and tSPS = 5 ns defines the minimum separation between competing semaphore requests to guarantee priority resolution.

Is 7025L20PFGI pin-compatible with other members of the IDT7025 family?

Yes - the 7025L20PFGI shares identical pinout and footprint with all IDT7025X20 variants (e.g., 7025S20PFGI, 7025L20PGI) in the 100-pin TQFP package. Differences are limited to internal power optimization (L vs S) and screening grade (commercial/industrial/military), not pin function or assignment. This allows direct substitution in existing designs when upgrading from S- to L-version for lower standby current or industrial qualification - verified in Pin Configurations section of DSC 2683/13.