Renesas 7130SA55TF8

Overview

7130SA55TF8 from IDT (Integrated Device Technology) is a high-speed 1K × 8 dual-port static RAM with master arbitration logic, 55 ns maximum access time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous independent read/write access from left and right ports in real-time communication systems such as digital signal processors interfacing with microcontrollers.

For engineers reviewing the 7130SA55TF8 datasheet, 7130SA55TF8 pinout, 7130SA55TF8 application, or 7130SA55TF8 equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 55 ns), dual-port I/O drive capability (4 mA sink, 0.4 V VOL), standby current (ISB1 = 20 mA typ. at fMAX), and compatibility with MASTER/SLAVE expansion using IDT7140.

Technical Context

The 7130SA55TF8 implements fully asynchronous dual-port operation with separate address, control, and data buses for left (L) and right (R) ports. Its on-chip arbitration logic resolves contention via BUSYL/BUSYR open-drain outputs (requiring external pull-ups), with tAPS = 5 ns priority setup time and tBDD ≤ 55 ns disable-to-valid-data delay.

It supports R/W-controlled and CE-controlled write cycles, features INTL/INTR flags for port-to-port signaling, and maintains data integrity during concurrent access through hardware-enforced BUSY assertion-no external logic required for conflict resolution in 16-bit-or-wider memory expansions.

Key Specifications

Pinout & Package

7130SA55TF8 is packaged in a 64-pin STQFP (Small Thin Quad Flat Package), body size 10 mm × 10 mm × 1.4 mm, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1352KV18 and IDT7140SA55TF8, the 7130SA55TF8 uniquely delivers autonomous contention resolution, asynchronous operation, and self-contained MASTER functionality-enabling simpler, lower-latency designs in real-time embedded systems without external arbitration hardware.

Availability

7130SA55TF8 is available at Aetrix Electronics and suitable for industrial motor control, digital signal processing, programmable logic controller (PLC), and redundant safety controller applications requiring stable component supply and long-term lifecycle support.

Supply support for 7130SA55TF8 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 semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics.

The IDT7130 product line was designed specifically for deterministic, low-latency dual-processor communication in industrial and military embedded systems-emphasizing hardware arbitration, wide temperature operation, and drop-in replaceability in legacy 5V designs.

FAQ

What is the maximum operating temperature range for the 7130SA55TF8?

The 7130SA55TF8 is rated for industrial temperature operation from –40°C to +85°C, verified across all electrical parameters including access time (55 ns max), standby current (20 mA typ.), and BUSY arbitration timing (tBDD ≤ 55 ns). This range supports deployment in harsh environments such as factory automation controllers and outdoor telecom equipment without derating.

Does the 7130SA55TF8 require external pull-up resistors on BUSY pins?

Yes, the 7130SA55TF8 BUSYL and BUSYR pins are open-drain outputs and require external pull-up resistors to VCC. The datasheet specifies a 1.25 kΩ resistor for 5V operation with 100 pF load (55 ns version). Without pull-ups, BUSY signals remain floating and arbitration fails-this is mandatory for correct MASTER-mode operation.

Can the 7130SA55TF8 operate as a standalone 8-bit memory without a SLAVE device?

Yes, the 7130SA55TF8 functions as a complete stand-alone 1K × 8 dual-port SRAM. Its on-chip arbitration logic, BUSY outputs, and INT flags are fully operational without any SLAVE device. The SLAVE (IDT7140) is optional and used only when expanding data width beyond 8 bits-e.g., pairing one 7130SA55TF8 MASTER with two 7140SA55TF8 SLAVES for 24-bit word access.

What is the minimum pulse width required for a valid write cycle on the 7130SA55TF8?

The minimum write pulse width (tWP) for the 7130SA55TF8 is 30 ns, specified for the 55 ns speed grade. This applies to both R/W-controlled and CE-controlled write cycles. If OE is active (LOW) during the write, the effective pulse must be the larger of tWP or (tWZ + tDW) = 30 ns + 20 ns = 50 ns to ensure I/O drivers fully disable before data placement.

How does the 7130SA55TF8 handle simultaneous writes to the same memory location from both ports?

The 7130SA55TF8 uses hardware arbitration: when both ports attempt to write to the same address, the port that asserts its address and enable signals first (meeting tAPS ≥ 5 ns setup) wins. The losing port's BUSY pin goes LOW, internally inhibiting its write-no data corruption occurs. The winning port completes the write, and the losing port may retry after BUSY deasserts, ensuring deterministic, glitch-free conflict resolution.