Renesas 7132SA100L48B

Overview

7132SA100L48B from IDT is a high-speed 2K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, BUSY output flag (open-drain), 100 ns max read/write cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables full-speed 16-bit-or-wider memory expansion when paired with IDT7142 SLAVE devices in real-time embedded control systems.

For engineers reviewing the 7132SA100L48B datasheet, 7132SA100L48B pinout, 7132SA100L48B application, or 7132SA100L48B equivalent, key selection criteria include BUSY arbitration timing (tBAA ≤ 50 ns), dual-port asynchronous access capability, low-power standby current (ISB3 = 1.0 mA typ.), and flatpack package compatibility with high-reliability military/industrial PCB layouts.

Technical Context

The 7132SA100L48B implements independent left/right port control with separate address (A0–A10), data (I/O0–I/O7), and control lines (CEL/CER, OEL/OER, R/WL/R/WR, BUSYL/BUSYR). Its on-chip arbitration logic resolves simultaneous accesses to identical addresses by asserting BUSY outputs to stall the later-arriving write-based solely on chip enable and address signal timing, not R/W state.

As a MASTER-only device, it features open-drain BUSY outputs requiring 270 Ω pull-up resistors, supports battery backup data retention only in LA variants (not applicable here), and delivers 100 ns access in industrial-grade operation with ISB1 = 20 mA max (both ports TTL-level standby) and ICC = 65 mA typ. (both ports active).

Key Specifications

Pinout & Package

48-pin flatpack (FP48) package with 0.050″ lead pitch, body dimensions ≈ 0.75″ × 0.75″ × 0.11″, and index mark at Pin 1. All VCC pins (Pins 24, 48) require local decoupling; all GND pins (Pins 1, 25) must connect to solid ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-100AXC, the 7132SA100L48B integrates arbitration to reduce component count and improve determinism; compared with IDT7142SA100L48B, it serves as the sole decision point in multi-SRAM arrays-making it irreplaceable in MASTER role implementations.

Availability

7132SA100L48B is available at Aetrix Electronics and suitable for real-time motor control, avionics data buffering, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles.

Supply support for 7132SA100L48B 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 IDT7132 family was designed specifically for deterministic dual-processor memory sharing in safety-critical embedded systems-emphasizing hardware arbitration, industrial temperature reliability, and MIL-PRF-38535-compliant packaging.

FAQ

What is the function of BUSYL and BUSYR on the 7132SA100L48B?

BUSYL and BUSYR are open-drain output flags indicating port contention on the left and right ports respectively. When both ports attempt access to the same memory address, the 7132SA100L48B asserts the corresponding BUSY pin LOW to stall the later-arriving write. External 270 Ω pull-up resistors to VCC are mandatory for proper operation-without them, BUSY signals remain undefined and arbitration fails.

Can the 7132SA100L48B operate as a standalone dual-port RAM without pairing with IDT7142?

Yes, the 7132SA100L48B functions fully as a standalone 2K × 8 dual-port SRAM with independent left/right access. Its MASTER designation refers to its ability to control arbitration in expanded arrays-not a dependency on SLAVE devices. Standalone use is common in dual-CPU systems where both processors share the same memory space without width expansion.

What is the maximum clock frequency supported by the 7132SA100L48B in synchronous interface mode?

The 7132SA100L48B does not include an internal clock; it operates asynchronously. However, its 100 ns read cycle time (tRC) supports a maximum effective interface clock of 10 MHz when used with external timing control-provided address and control setup/hold times (e.g., tAS = 0 ns, tDH = 0 ns) are met. This enables direct connection to microcontrollers with programmable wait-state generators.

How does the 7132SA100L48B handle simultaneous read and write operations to the same address?

When simultaneous access occurs, the 7132SA100L48B uses on-chip arbitration logic to determine the winner based on relative timing of address and chip enable signals. The winning port proceeds; the losing port receives a BUSY assertion that gates its write signal internally. Read operations are never blocked-only writes are inhibited, ensuring data integrity without corrupting existing memory contents.

Is the 7132SA100L48B pin-compatible with other speed grades in the IDT7132SA/LA family?

Yes, all IDT7132SA/LA variants-including 7132SA20, 7132SA25, 7132SA35, and 7132SA100-share identical 48-pin flatpack pinouts and electrical interface definitions. Speed grade differences affect only timing parameters (e.g., tRC, tAA); no PCB redesign is needed when upgrading or downgrading within the SA series, provided system timing margins accommodate the selected grade.