Renesas 7130LA25L48B

Overview

7130LA25L48B from IDT (Integrated Device Technology) is a high-speed 1K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 25 ns maximum access time, 1 mW typical standby power, battery-backed data retention at 2 V, and TTL-compatible 5 V ±10% operation - used in real-time inter-processor communication systems requiring concurrent read/write access without external logic.

For engineers reviewing the 7130LA25L48B datasheet, 7130LA25L48B pinout, 7130LA25L48B application, or 7130LA25L48B equivalent, key selection considerations include BUSY-flag arbitration timing (tBAA ≤ 25 ns), dual-port I/O isolation, INT/INTR port-to-port signaling, 48-pin ceramic flatpack package compatibility, and LA-series low-power retention behavior under V_CC = 2 V.

Technical Context

The 7130LA25L48B implements fully asynchronous dual-port architecture with independent left/right address, control, and data buses. Its on-chip arbitration logic resolves simultaneous access to the same memory location by asserting BUSYL/BUSYR open-drain outputs, requiring external pull-up resistors per datasheet Note 1.

It supports MASTER-only functions: BUSY output (not input), automatic port priority resolution via tAPS ≥ 5 ns setup, and INTL/INTR flag generation for inter-port interrupt signaling. Battery backup mode enables data retention at 2 V with ICCDR ≤ 4000 µA (military grade) while maintaining full 25 ns read/write performance at nominal 5 V.

Key Specifications

Pinout & Package

48-pin ceramic flatpack (FP48) package with 0.75″ × 0.75″ body size and side-brazed leads; pin 1 index corner marked, all V_CC and GND pins require dedicated decoupling per datasheet Notes 1–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131-25ZXI, the 7130LA25L48B integrates arbitration and interrupt logic, reducing system-level complexity; compared with IDT7140LA25L48B, it provides MASTER-specific BUSY output and priority resolution essential for standalone dual-processor interfaces.

Availability

7130LA25L48B is available at Aetrix Electronics and suitable for real-time inter-processor communication, military avionics data logging, and industrial PLC redundancy modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7130LA25L48B 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 memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT7130/7140 family was designed specifically for deterministic dual-processor memory sharing in mission-critical systems where hardware arbitration, low-power retention, and MIL-PRF-38535 compliance are mandatory.

FAQ

What is the function of BUSYL and BUSYR on the 7130LA25L48B?

BUSYL and BUSYR are open-drain arbitration outputs on the 7130LA25L48B. When asserted LOW, they inhibit writes to the respective port during memory contention. Per datasheet Note 1, external pull-up resistors are required. These signals enable hardware-coordinated access without software polling or external logic - a core feature distinguishing the MASTER 7130LA25L48B from SLAVE variants like IDT7140LA25L48B.

Does the 7130LA25L48B support true simultaneous read/write operations?

Yes - the 7130LA25L48B supports fully asynchronous, independent read and write operations on left and right ports. If accesses target different addresses, both complete concurrently with 25 ns timing. If both ports access the same location, on-chip arbitration asserts BUSYL or BUSYR to delay the later request, ensuring data coherency. This behavior is intrinsic to the MASTER architecture and documented in Truth Table III and timing waveforms DRW12–DRW15.

What is the significance of the 'LA' suffix in 7130LA25L48B?

The 'LA' denotes Low-power Active/Standby and battery-backed data retention capability. Unlike 'SA' versions, the 7130LA25L48B draws only 1 mW typical in standby (vs. 5 mW for SA) and retains data at V_CC = 2.0 V - critical for systems requiring non-volatile memory hold during main power loss. This is verified in Table 07 (Data Retention Characteristics) and applies exclusively to LA-grade parts.

Can the 7130LA25L48B be used without external pull-up resistors on BUSY pins?

No - the 7130LA25L48B BUSYL and BUSYR pins are open-drain outputs and require external pull-up resistors to V_CC to generate valid HIGH logic levels. Datasheet Note 1 explicitly states this requirement. Omitting pull-ups results in undefined BUSY states, causing unreliable arbitration and potential data corruption during contention. Typical values range from 4.7 kΩ to 10 kΩ depending on bus capacitance and rise-time targets.

How does the 7130LA25L48B handle port-to-port interrupts?

The 7130LA25L48B uses dedicated INTL (left port) and INTR (right port) outputs to signal inter-port events. Writing to address 3FFH on one port sets the INTR flag on the opposite port; writing to 3FEH clears it - per Truth Table II. These active-HIGH flags eliminate software polling, enabling immediate ISR response. The 7130LA25L48B is the only variant in the family with this MASTER interrupt generation capability.