Renesas 71124S12YG

Overview

71124S12YG from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with JEDEC center-power/ground pinout, 12 ns access time (commercial grade), 5 V single-supply operation, and TTL-compatible bidirectional I/O. It serves as fast, fully static main or cache memory in embedded controllers and data acquisition systems requiring deterministic timing without refresh.

For engineers reviewing the 71124S12YG datasheet, 71124S12YG pinout, 71124S12YG application, or 71124S12YG equivalent, key selection criteria include its 12 ns read cycle time, SOJ-32 package with center VCC/GND layout for noise reduction, low 160 mA dynamic current, and industrial-grade alternatives with relaxed timing.

Technical Context

The 71124S12YG implements fully static asynchronous logic-no clocks or refresh cycles required-and uses high-reliability CMOS fabrication to achieve stable operation across 0°C to +70°C. Its dual control architecture features independent Chip Select (CS) and Output Enable (OE), enabling fast output enable (6 ns) and chip-select access (12 ns).

JEDEC-standardized center-power/ground pinout minimizes simultaneous switching noise by separating supply and return paths at the package center. All inputs and outputs are TTL-compatible with VIH ≥ 2.2 V and VIL ≤ 0.8 V under 5 V ±10% supply conditions.

Key Specifications

Pinout & Package

71124S12YG is housed in a 32-pin 400-mil Plastic SOJ (package code PBG32), featuring JEDEC-revolutionary center-power/ground layout to suppress ground bounce and crosstalk in high-speed bus designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed parallel SRAM applications.

Compared with CY62128EV30LL-45ZSXIT and AS6C1008-12TIN, the 71124S12YG delivers fastest access in a legacy 5 V commercial environment but lacks extended temperature support - making AS6C1008-12TIN preferable for harsh environments, while CY62128EV30LL-45ZSXIT suits low-power 3.3 V redesigns.

Availability

71124S12YG is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical imaging frame stores, and avionics data loggers requiring stable component supply and long-term obsolescence management.

Supply support for 71124S12YG 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 71124S12YG belongs to Renesas' legacy high-speed parallel SRAM product line, designed specifically for deterministic, low-jitter memory interfacing in 5 V embedded control and instrumentation systems.

FAQ

What is the maximum access time specification for the 71124S12YG?

The 71124S12YG has a maximum address access time (tAA) of 12 ns under commercial temperature conditions (0°C to +70°C) and 5 V ±10% supply. This value is guaranteed across the full operating range and defines the worst-case delay from valid address assertion to stable data output during read cycles. The 71124S12YG achieves this performance using optimized CMOS circuit design and JEDEC center-power pinout to minimize noise-induced timing margin loss.

Does the 71124S12YG require a clock or refresh signal to operate?

No, the 71124S12YG uses fully static asynchronous circuitry and requires no clock or refresh signals. Its internal latches retain data indefinitely as long as power is applied and CS remains asserted during access. This eliminates timing complexity in microcontroller-based systems and ensures deterministic behavior in safety-critical applications like avionics data logging - a core design feature confirmed in the Renesas datasheet for the 71124S12YG.

What package type and pin count does the 71124S12YG use?

The 71124S12YG is packaged in a 32-pin 400-mil Plastic SOJ (Small Outline J-Lead), designated PBG32 in Renesas ordering nomenclature. Its JEDEC-standard pinout places VCC and GND at the center of the package (Pins 24 and 13 respectively) to reduce simultaneous switching noise - a verified mechanical and electrical characteristic documented for the 71124S12YG in the official Renesas datasheet revision dated February 27, 2020.

Can the 71124S12YG interface directly with 5 V TTL logic devices?

Yes, the 71124S12YG features fully TTL-compatible inputs and outputs: VIH is guaranteed ≥2.2 V, VIL ≤0.8 V, VOH ≥2.4 V at –4 mA, and VOL ≤0.4 V at 8 mA - all specified at VCC = 4.5 V to 5.5 V. This allows direct connection to legacy 5 V microcontrollers, FPGAs, and peripheral ICs without level-shifting circuitry, as confirmed in the DC Electrical Characteristics table of the 71124S12YG datasheet.

What is the standby current consumption of the 71124S12YG when deselected?

When Chip Select (CS) is driven HIGH, the 71124S12YG enters TTL-level standby mode with a maximum supply current (ISB) of 40 mA at VCC = 5.5 V and fMAX. In full CMOS-level standby (CS > VHC), ISB1 drops to 10 mA - both values measured across the commercial temperature range and explicitly specified in Table 7 of the 71124S12YG datasheet. This dual-mode standby supports flexible power management in burst-access memory architectures.