Renesas 71256L20YGI8

Overview

71256L20YGI8 from Renesas Electronics is a 256K (32K × 8-bit) low-power CMOS static RAM with 20ns maximum address access time, TTL-compatible I/O, and industrial temperature range (–40°C to +85°C). It features battery-backed data retention at 2V, 5μW standby power, and SOJ-28 packaging - deployed in avionics control modules, ruggedized industrial PLCs, and legacy military communication subsystems requiring nonvolatile SRAM persistence.

For engineers reviewing the 71256L20YGI8 datasheet, 71256L20YGI8 pinout, 71256L20YGI8 application, or 71256L20YGI8 equivalent, key selection criteria include its 20ns read cycle timing, 2V data retention capability, industrial-grade thermal performance, SOJ-28 footprint compatibility, and CMOS/TTL interface interoperability in space-constrained embedded memory designs.

Technical Context

The 71256L20YGI8 implements a full CMOS static memory array with asynchronous parallel interface logic, supporting independent chip select (CS), output enable (OE), and write enable (WE) controls. Its architecture enables three distinct operational modes: active read/write, TTL-level standby (ISB), and CMOS-level full standby (ISB1), each with verified current consumption values across temperature grades.

Timing behavior is defined by strict AC parameters including tAA ≤ 20ns, tRC = 20ns, tCLZ = 5ns, and tCHZ ≤ 10ns - all guaranteed over –40°C to +85°C. The device uses standard address/data multiplexing-free 8-bit bidirectional I/O lines and 15 address inputs (A0–A14), with no internal refresh or clock required.

Key Specifications

Pinout & Package

71256L20YGI8 is housed in a 28-pin Small Outline J-Lead (SOJ) package (code PJG28), 300-mil body width, lead pitch 1.27mm, compliant with JEDEC MS-013AC. The package supports reflow soldering per IPC/JEDEC J-STD-020 and is rated for moisture sensitivity level MSL-3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 71256L20YGI8, CY62128EV30LL-45ZSXI trades speed and voltage compatibility for modern low-power process benefits, while AS6C4008-20TIN offers double density at same speed but requires PCB redesign and forfeits battery backup capability - making 71256L20YGI8 uniquely suited for legacy 5V industrial systems needing guaranteed 2V retention in SOJ-28 form factor.

Availability

71256L20YGI8 is available at Aetrix Electronics and suitable for avionics data logging, rugged industrial HMI, and military radio firmware caching requiring stable component supply, long-term obsolescence management, and traceable sourcing for safety-critical deployments.

Supply support for 71256L20YGI8 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 71256L20YGI8 belongs to Renesas' legacy high-reliability SRAM product line, designed specifically for mission-critical embedded systems demanding deterministic timing, extended temperature operation, and battery-backed nonvolatility without external support circuitry.

FAQ

What is the minimum VCC required for data retention in the 71256L20YGI8?

The 71256L20YGI8 guarantees data retention down to 2.0V VCC across its full industrial temperature range (–40°C to +85°C), as specified in Table 11 of the Renesas datasheet. This allows direct connection to primary lithium or supercapacitor backup sources without regulation. Operation below 2.0V risks data loss, and the device does not specify retention at 1.8V or lower. The 71256L20YGI8 achieves this using optimized CMOS leakage control in its low-power (L) variant.

Does the 71256L20YGI8 support true 5V TTL interface levels?

Yes, the 71256L20YGI8 features fully TTL-compatible inputs and outputs: VIH(min) = 2.2V, VIL(max) = 0.8V, VOH(min) = 2.4V at –4mA, and VOL(max) = 0.4V at 8mA - matching standard 74LS logic thresholds. No level shifters are needed when interfacing with legacy 5V microcontrollers, FPGAs, or bus transceivers. This compatibility is confirmed in Table 6 and Table 10 of the Renesas datasheet for the 71256L20YGI8.

What is the standby current consumption of the 71256L20YGI8 under full CMOS-level disable?

The 71256L20YGI8 draws 1.5μA typical (3μA max) in full standby mode (ISB1), activated when CS exceeds VHC (VCC – 0.2V) with no address or data activity. This is measured at VCC = 5.5V and TA = +25°C per Table 8. At industrial temperatures, ISB1 remains ≤5μA - enabling multi-year battery life in retention-critical applications. This ultra-low value distinguishes the 71256L20YGI8 from standard (S) variants, which draw 20mA in the same condition.

Is the 71256L20YGI8 pin-compatible with other members of the 71256 family?

The 71256L20YGI8 shares identical 28-pin SOJ (PJG28) pinout and signal assignment with all 71256L and 71256S variants in SOJ packaging, including 71256L25YGI8 and 71256L35YGI8. Pin functions (A0–A14, I/O0–I/O7, CS, WE, OE, VCC, GND) are electrically and physically identical. However, speed grade differences affect timing margins - substituting a slower variant may require system-level timing validation, though no PCB changes are needed.

What package type and dimensions does the 71256L20YGI8 use?

The 71256L20YGI8 uses a 28-pin Small Outline J-Lead (SOJ) package designated PJG28: 300-mil body width (7.62mm), 1.27mm lead pitch, and J-shaped leads for gull-wing soldering. Its footprint matches JEDEC MS-013AC and IPC-7351B SOIC-28 standards. The '8' suffix denotes tape-and-reel packaging (1,000 units per reel), while 'I' indicates industrial temperature grade - both encoded in the full 71256L20YGI8 orderable part number.