Renesas 71V256SA15PZG

Overview

71V256SA15PZG from Renesas is a 3.3V CMOS static RAM organized as 32K × 8 (256K-bit), designed for secondary cache in high-performance 3.3V processor systems. It delivers 15ns access time, 2mA full-standby current, LVTTL-compatible I/O, and operates across commercial temperature range (0°C to +70°C) in a 28-pin TSOP Type I package.

For engineers reviewing the 71V256SA15PZG datasheet, 71V256SA15PZG pinout, 71V256SA15PZG application, or 71V256SA15PZG equivalent, key selection criteria include guaranteed 15ns read cycle time, CMOS-level full-standby power (≤2mA), TSOP-28 footprint compatibility, and support for CS-controlled write timing with tCW ≤15ns.

Technical Context

The 71V256SA15PZG implements a fully asynchronous SRAM architecture with independent chip select (CS), output enable (OE), and write enable (WE) controls. Its memory array uses high-reliability CMOS process technology and supports three distinct operational modes: active read/write, standby (CS HIGH), and full standby (CS at CMOS HIGH level, f = 0).

Timing behavior is defined by dual-cycle control: read cycles require CS and OE asserted low with WE high, while writes require simultaneous low CS and low WE. Output drive strength meets LVTTL specifications (VOH ≥2.4V at –4mA, VOL ≤0.4V at 8mA), ensuring interoperability with 3.3V logic families without level translation.

Key Specifications

Pinout & Package

71V256SA15PZG is housed in a 28-pin TSOP Type I (PZG28) package with 0.5mm lead pitch and JEDEC-standard footprint. Pin 1 is marked by a notch or dot; leads are gull-wing, suitable for automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62256ELL-45ZXI and AS6C4008-15TIN, the 71V256SA15PZG offers optimal fit for 3.3V, space-constrained, commercial-grade secondary cache where 15ns timing and TSOP-28 footprint are mandatory constraints.

Availability

71V256SA15PZG is available at Aetrix Electronics and suitable for desktop motherboard design, industrial PLC development, and medical imaging hardware requiring stable component supply and long-lifecycle support.

Supply support for 71V256SA15PZG 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 IDT71V256SA family was originally developed by Integrated Device Technology (acquired by Renesas in 2019) to deliver high-speed, low-power SRAM for 3.3V processor cache and buffering applications in commercial computing systems.

FAQ

What is the maximum operating frequency supported by the 71V256SA15PZG?

The 71V256SA15PZG does not operate on a clock signal-it is an asynchronous SRAM. Its performance is specified by access and cycle times: tRC = 15ns maximum read cycle time implies a theoretical upper limit of ~66.7 MHz for consecutive random accesses, but actual system throughput depends on bus protocol, controller timing margins, and CS/OE assertion latencies. The 71V256SA15PZG datasheet guarantees timing under worst-case VCC and temperature conditions.

Does the 71V256SA15PZG support battery backup operation?

Yes, the 71V256SA15PZG supports battery backup via its ultra-low full-standby current (ISB1 ≤2mA at VCC max and f = 0). When CS is held at CMOS HIGH level and all inputs are stable, the device enters full standby mode consuming minimal power-enabling retention of data for hours using a small coin-cell battery and diode-OR power switch circuit. This behavior is explicitly characterized in the DC Electrical Characteristics table.

Can the 71V256SA15PZG be used in place of the 71V256SA12PZG?

No-the 71V256SA15PZG has a guaranteed 15ns access time, while the 71V256SA12PZG guarantees 12ns. Substituting the 15ns part into a design timed for 12ns may cause setup/hold violations or data corruption under worst-case voltage and temperature conditions. The 71V256SA15PZG is not a drop-in replacement for the 12ns variant unless timing margins have been re-verified for the slower speed grade.

What is the meaning of "PZG" in the 71V256SA15PZG part number?

In the 71V256SA15PZG ordering code, "PZG" denotes the package type: P = plastic, Z = TSOP Type I, G = green (lead-free, RoHS-compliant) finish. The full suffix "PZG28" confirms it is a 28-pin TSOP Type I package with lead-free termination, as documented in the Renesas ordering information table. This matches the mechanical drawing PJ G28 referenced in the datasheet.

Is the 71V256SA15PZG pin-compatible with other 28-pin SRAMs like the 62256 series?

No-the 71V256SA15PZG uses a non-standard pinout optimized for high-speed operation: A14 is on pin 1, CS on pin 18, and WE on pin 17, differing from industry-standard 28-pin SRAMs (e.g., 62256 places A14 on pin 28, CS on pin 20, WE on pin 27). Direct substitution would require PCB redesign. Always verify pin mapping against the 71V256SA15PZG-specific top-view diagram (Figure 3101 drw 03) before layout reuse.