Renesas 71024S15TYG

Overview

71024S15TYG from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with 15 ns access and cycle times, commercial temperature range (0°C to +70°C), single 5V supply operation, and TTL-compatible bidirectional I/O. It serves as a fast, fully static asynchronous memory buffer in embedded controllers, industrial PLCs, and legacy communication interface modules.

For engineers reviewing the 71024S15TYG datasheet, 71024S15TYG pinout, 71024S15TYG application, or 71024S15TYG equivalent, key selection criteria include access time consistency across CS1/CS2 enable logic, low-Z output enable timing (tOE ≤ 7 ns), standby current (ISB1 = 10 mA), and SOJ-32 package compatibility with legacy board layouts.

Technical Context

The 71024S15TYG implements fully static asynchronous architecture-no clocks or refresh required-with dual chip select (CS1, CS2) and dedicated output enable (OE) for precise bus control. Its address access time (tAA = 15 ns) matches its read cycle time (tRC = 15 ns), ensuring deterministic timing in burst-free memory interfaces.

All inputs and outputs are TTL-compatible (VIH ≥ 2.2 V, VIL ≤ 0.8 V), and the device supports three power states: active read/write (ICC = 155 mA), TTL-level standby (ISB = 40 mA), and CMOS-level deep standby (ISB1 = 10 mA), enabling dynamic power management in battery-backed systems.

Key Specifications

Pinout & Package

71024S15TYG is housed in a 32-pin Plastic Small Outline J-Lead (SOJ) package, 300 mil body width (PJG32), with gull-wing leads optimized for wave soldering and legacy PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62128EV30LL-45ZSXIT and AS6C1008-15TIN, the 71024S15TYG uniquely delivers 15 ns performance in a legacy-compatible 300-mil SOJ package with dual-CS decode logic-making it the only drop-in replacement for fielded systems requiring unchanged footprint and timing-critical operation.

Availability

71024S15TYG is available at Aetrix Electronics and suitable for industrial PLCs, legacy telecom line cards, medical control panels, and avionics display interfaces requiring stable component supply and long-term obsolescence mitigation.

Supply support for 71024S15TYG 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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 71024S15TYG belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for pin-compatible replacement and long-life support in 5V industrial control and communications equipment.

FAQ

What is the operating voltage range for the 71024S15TYG?

The 71024S15TYG operates from a single 5V supply with a specified range of 4.5 V to 5.5 V (VCC = 5.0 V ± 10%). This tolerance ensures reliable functionality across varying 5V rail conditions in industrial environments. All DC and AC parameters-including tAA = 15 ns and ISB1 = 10 mA-are guaranteed across this full voltage range at commercial temperature (0°C to +70°C). The 71024S15TYG does not support 3.3V or mixed-voltage operation.

Does the 71024S15TYG require refresh circuitry or clock signals?

No, the 71024S15TYG uses fully static CMOS architecture and requires no refresh cycles, clocks, or external timing signals. Data retention is indefinite as long as VCC remains within specification and temperature stays within 0°C to +70°C. This eliminates refresh overhead in microcontroller-based systems and simplifies PCB layout by removing clock distribution traces. The 71024S15TYG functions purely on address, CS, OE, and WE edge transitions.

What is the meaning of "TYG" in the part number 71024S15TYG?

In the 71024S15TYG ordering code, "T" denotes tape-and-reel packaging, "Y" specifies the 300-mil Plastic SOJ (PJG32) package, and "G" indicates RoHS-compliant "Green" construction (lead-free, halogen-free). This exact variant is rated for commercial temperature (0°C to +70°C) and 15 ns speed grade. The 71024S15TYG is distinct from industrial-grade variants (e.g., 71024S15TYGI) which substitute "I" for temperature grade.

How does the dual chip select (CS1/CS2) logic work on the 71024S15TYG?

The 71024S15TYG uses CS1 (active-low) and CS2 (active-high) together to enable the device: both must be asserted simultaneously (CS1 = LOW, CS2 = HIGH) for read or write operations. This dual-signal scheme prevents spurious activation during power-up or bus contention. When either CS is inactive, the device enters standby (ISB = 40 mA) or deep standby (ISB1 = 10 mA), depending on input voltage thresholds-enabling robust hierarchical memory decoding in multi-chip systems.

Can the 71024S15TYG be used in place of faster or slower speed grades like 71024S12TYG or 71024S20TYG?

Yes-71024S15TYG is pin- and functionally compatible with other 71024SxxTYG variants (e.g., 71024S12TYG, 71024S20TYG) in the same SOJ-32 package. All share identical pinout, voltage specs, and timing architecture; only access/cycle times differ (12 ns, 15 ns, or 20 ns). A 15 ns part may replace a 20 ns part without issue, but substituting a 12 ns part requires verifying that downstream timing margins accommodate tighter windows. The 71024S15TYG itself is not a drop-in for non-SOJ packages (e.g., PBG32).