Renesas IDT71016S12Y

Overview

IDT71016S12Y from Integrated Device Technology is a 64K × 16-bit (1 Mbit) high-speed CMOS static RAM with 12 ns access time, TTL-compatible I/O, single 5 V supply operation, and dual byte enable (BHE/BLE) for flexible 8-bit or 16-bit data bus interfacing - used in legacy industrial controllers and embedded memory subsystems requiring deterministic asynchronous timing.

For engineers reviewing the IDT71016S12Y datasheet, IDT71016S12Y pinout, IDT71016S12Y application, or IDT71016S12Y equivalent, key selection criteria include verified 12 ns commercial-grade timing at 5 V, SOJ-44 package compatibility, byte-selectable write capability, and support for no-refresh static operation in real-time control buffers and FPGA configuration storage.

Technical Context

The IDT71016S12Y implements fully static asynchronous architecture with no clocks or refresh required. Its address decoding, sense amplifiers, and bidirectional I/O drivers are all CMOS-based and operate across 0°C to +70°C (Commercial grade), with TTL-level input thresholds and output drive strength compliant to ±4 mA VOH/8 mA VOL.

It supports three independent write control modes: chip-select–driven, write-enable–driven, and byte-enable–driven - each with defined setup/hold and pulse-width constraints (e.g., tWP ≥ 9 ns). Output enable propagation delay is guaranteed ≤7 ns, enabling tight timing closure in microprocessor co-processor interfaces.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 44-pin Plastic SOJ (SO44-1), 400-mil body width, with gull-wing leads and pin 1 index notch. Pin 1 is A0; pins 23 and 32 are VCC; pins 11 and 24 are VSS; pin 3 is A12; pin 44 is A5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed static RAM applications.

Compared with CY7C1016D-12ZXC and IS61LV1024-12ML, the IDT71016S12Y uniquely retains SOJ-44 compatibility, true dual-byte enable logic, and documented 12 ns timing across its full commercial spec - making it the only option for drop-in replacement in legacy 400-mil SOJ sockets with x86-aligned byte control.

Availability

IDT71016S12Y is available at Aetrix Electronics and suitable for industrial PLC memory buffers, FPGA configuration storage, and legacy x86 co-processor cache applications requiring stable component supply and long-lifecycle support.

Supply support for IDT71016S12Y 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

Integrated Device Technology (IDT) was a U.S.-based fabless semiconductor company specializing in timing, memory, and interface ICs before its acquisition by Renesas in 2019. It pioneered high-speed SRAM architectures for embedded computing.

The IDT71016S12Y belongs to IDT's flagship 71000-series high-speed CMOS SRAM family, designed specifically for deterministic, no-refresh memory interfacing in microprocessor, controller, and FPGA-based systems operating at 5 V.

FAQ

What is the maximum operating frequency supported by the IDT71016S12Y?

The IDT71016S12Y does not operate on a clock signal - it is an asynchronous static RAM. Its performance is specified by timing parameters, not frequency. With a 12 ns read cycle time (tRC), it supports up to approximately 83 MHz effective throughput in continuous sequential reads, assuming ideal bus turnaround and no wait states. The IDT71016S12Y achieves this using fully static CMOS circuitry without clocks or refresh cycles.

Does the IDT71016S12Y require external refresh circuitry?

No, the IDT71016S12Y is a true static RAM and requires no refresh circuitry. Its memory cells retain data as long as power is applied, eliminating the need for periodic refresh cycles that complicate system timing. This makes the IDT71016S12Y ideal for real-time control applications where deterministic latency is mandatory, such as industrial PLC scan buffers and test equipment pattern stores.

Can the IDT71016S12Y be used with a 3.3 V microcontroller interface?

No - the IDT71016S12Y is strictly a 5 V device with TTL-compatible I/O thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and requires VCC = 4.5–5.5 V. Direct connection to 3.3 V logic risks violating input voltage limits and may cause unreliable operation. If interfacing with 3.3 V systems, level-shifting circuitry or a 3.3 V–compatible SRAM like the IDT71V1024 is required instead of the IDT71016S12Y.

What is the function of the BHE and BLE pins on the IDT71016S12Y?

BHE (High Byte Enable) and BLE (Low Byte Enable) are independent active-low write control inputs that allow selective writing to the upper (I/O8–I/O15) or lower (I/O0–I/O7) byte of the 16-bit data bus. When only BHE is asserted, only the high byte is written; when only BLE is asserted, only the low byte is written. This enables efficient 8-bit peripheral interfacing without read-modify-write cycles - a key feature of the IDT71016S12Y in x86 and ISA bus designs.

Is the IDT71016S12Y still recommended for new designs?

No - the IDT71016S12Y was officially marked "Not recommended for new designs" in August 2000 (per datasheet revision history), and that notice was removed in February 2001. While still available through legacy channels like Aetrix Electronics, it is considered obsolete for new product development. Engineers designing new systems should evaluate modern low-voltage, higher-density alternatives - though the IDT71016S12Y remains viable for repair, replacement, and long-term maintenance of existing equipment.