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Renesas IDT71256SA12Y
- Part No.:
- IDT71256SA12Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
IDT71256SA12Y.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,546
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Product details
Overview
IDT71256SA12Y from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 12 ns access time, TTL-compatible I/O, single 5 V supply operation, and industrial-grade temperature range (–40°C to +85°C). It serves as a fast, fully static asynchronous memory buffer in embedded controllers, legacy industrial PLCs, and real-time data acquisition systems requiring deterministic read/write timing without refresh.
For engineers reviewing the IDT71256SA12Y datasheet, IDT71256SA12Y pinout, IDT71256SA12Y application, or IDT71256SA12Y equivalent, this device delivers verified 12 ns address access (tAA), 6 ns output enable delay (tOE), low-impedance bidirectional I/O, and dual standby current modes (ISB/ISB1) critical for power-sensitive edge nodes and long-lifecycle instrumentation.
Technical Context
The IDT71256SA12Y implements fully static asynchronous architecture-no clocks, no refresh cycles-enabling deterministic timing across all operating conditions. Its control logic supports independent chip select (CS) and output enable (OE) assertion, allowing partial-memory gating and multi-device bus sharing.
All 15 address inputs (A0–A14), 8 bidirectional data lines (I/O0–I/O7), and three control pins (CS, WE, OE) interface directly with TTL-level logic. The device guarantees tCLZ ≤ 4 ns and tOHZ ≤ 6 ns under industrial temperature and 5.0 V ±10% supply, ensuring reliable bus turnaround in high-speed microcontroller interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit array); enables byte-wide data transfers without external demultiplexing |
| Access Time (tAA) | 12 ns max at VCC = 4.5–5.5 V, TA = –40°C to +85°C; ensures sub-83 MHz random-read throughput |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic rails and tolerant of nominal ±10% regulation |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V, CS > VHC; enables ultra-low-power hold mode during CPU sleep states |
| I/O Compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOH ≥ 2.4 V @ –4 mA, VOL ≤ 0.4 V @ 8 mA) |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, motor drives, and outdoor telemetry hardware |
| Package | 28-pin 300-mil Plastic SOJ (PJG28); surface-mount compatible with legacy reflow profiles and manual repair |
Pinout & Package
Package: 28-pin 300-mil Plastic SOJ (PJG28), JEDEC MS-013AC compliant, body width 7.62 mm, lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus; selects one of 32,768 memory locations; latched on CS/WE transitions |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; high-impedance when CS = HIGH or OE = HIGH |
| CS | Chip Select Input | Active-low enable; places device in active or standby (ISB/ISB1) mode based on voltage threshold |
| WE | Write Enable Input | Active-low write strobe; controls data latch direction; must overlap CS LOW for valid write |
| OE | Output Enable Input | Active-low output gate; enables data output without deselecting chip; tOE = 6 ns max |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin per high-speed RAM layout guidelines |
| GND | Ground Reference | Signal and power return; requires low-inductance connection to minimize ground bounce during I/O switching |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns Access Time at Industrial Temp | Guaranteed tAA ≤ 12 ns over full –40°C to +85°C range-enables real-time firmware execution without wait states |
| Dual Standby Current Modes | ISB = 40 mA (TTL-level CS), ISB1 = 15 mA (CMOS-level CS); allows dynamic power scaling via control voltage selection |
| True Bidirectional I/O with TTL Compatibility | No external level shifters needed; supports direct interfacing to 8051, Z80, and 68K-family microcontrollers |
| No Clock or Refresh Required | Fully static design eliminates timing-critical refresh overhead and simplifies PCB layout for deterministic latency |
| Green Compliant Packaging | Pb-free, halogen-free SOJ package (PJG28) meets RoHS Directive 2011/65/EU and JIS C 0950 |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Memory Expansion |
|---|---|
Use Scenario: Real-time I/O scanning in programmable logic controllers where cycle time must remain stable under thermal stress. IC Role / Device Role / Timing Role: Primary scratchpad RAM holding process image data; accessed synchronously with scan loop clock. Use Value: 12 ns tAA and –40°C to +85°C rating ensure consistent 100 µs scan cycles across factory floor environments. |
Use Scenario: Adding external RAM to 8-bit MCUs (e.g., Intel 8031, Motorola 6805) with limited on-chip memory. IC Role / Device Role / Timing Role: Byte-wide memory-mapped expansion using standard address/data bus protocol. Use Value: TTL-compatible I/O and 5 V operation eliminate level-shifting components; PJG28 SOJ fits legacy through-hole-to-SMT transition layouts. |
| Telemetry Data Logger | Motor Drive Control FIFO |
Use Scenario: Buffered storage of sensor samples in battery-powered remote monitoring units deployed outdoors. IC Role / Device Role / Timing Role: Low-power data capture buffer; enters ISB1 mode between sampling intervals. Use Value: 15 mA ISB1 current extends battery life in intermittent-read applications while retaining data integrity. |
Use Scenario: Holding PWM update commands in servo amplifier modules requiring jitter-free command delivery. IC Role / Device Role / Timing Role: First-in-first-out command queue synchronized to motion controller clock. Use Value: tOH = 3 ns and tDH = 0 ns guarantee setup/hold compliance for 20+ MHz control loops without added logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256LL-12ZXI | Same 32K × 8 organization, 12 ns speed, but uses 28-pin TSOP (SOIC-type) instead of SOJ; higher ICC (175 mA vs. 160 mA) | Preferred for new designs using fine-pitch surface mount; less suitable for hand-soldered or legacy SOJ footprints | Select if board layout supports TSOP and lower standby current is not critical |
| AS6C256-12ZIN | 12 ns access, industrial temp, but only offers ISB = 30 mA (no ISB1 mode); different pinout (A14/A13 swapped) | Requires PCB redesign due to non-identical address pin mapping; lacks dual-standby optimization for duty-cycled systems | Choose only when PJG28 footprint is unavailable and ISB1 functionality is unnecessary |
Compared with CY62256LL-12ZXI and AS6C256-12ZIN, the IDT71256SA12Y uniquely combines SOJ packaging compatibility, dual standby modes, and guaranteed 12 ns performance across industrial temperature-making it optimal for drop-in replacement in field-deployed equipment.
Availability
IDT71256SA12Y is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller systems, and telemetry data loggers requiring stable component supply across extended product lifecycles.
Supply support for IDT71256SA12Y 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 IoT applications.
IDT71256SA12Y belongs to Renesas' legacy high-speed SRAM product line, designed specifically for industrial and embedded systems demanding deterministic timing, wide temperature operation, and long-term supply stability.
FAQ
What is the maximum guaranteed access time for IDT71256SA12Y across its full operating temperature range?
The IDT71256SA12Y guarantees tAA ≤ 12 ns over the full industrial temperature range of –40°C to +85°C at VCC = 4.5 V to 5.5 V. This value is production-tested and specified in the AC Electrical Characteristics table under the "71256SA12" speed grade column. No derating is required for thermal variation within this grade.
Does IDT71256SA12Y require a clock signal or periodic refresh cycles?
No, the IDT71256SA12Y uses fully static CMOS circuitry and requires neither a clock nor refresh cycles. Data retention is maintained indefinitely as long as VCC remains within specification and CS is held active or in standby mode. This eliminates timing-critical refresh overhead in microcontroller-based systems.
What are the two standby current modes supported by IDT71256SA12Y, and how are they activated?
IDT71256SA12Y supports ISB (40 mA max) when CS > VIH (TTL-high), and ISB1 (15 mA max) when CS > VHC (CMOS-high, ≈ VCC – 0.2 V). ISB1 activation requires tighter control of the CS input voltage but delivers 62.5% lower current-ideal for battery-backed or energy-harvesting applications.
Is IDT71256SA12Y pin-compatible with other 28-pin 300-mil SOJ SRAMs such as the IDT71256SA15YG?
Yes, IDT71256SA12Y shares identical pinout, package (PJG28), and signal assignment with all IDT71256SA-x-YG variants-including IDT71256SA15YG. The only differences are speed grade and resulting AC timing parameters; no PCB changes are needed when upgrading from 15 ns to 12 ns within the same SOJ package and temperature grade.
What package type and lead finish does IDT71256SA12Y use, and is it RoHS-compliant?
IDT71256SA12Y uses a 28-pin 300-mil Plastic SOJ (PJG28) package with matte tin (Sn) lead finish. It is RoHS-compliant, Pb-free, and halogen-free per JIS C 0950 and EU Directive 2011/65/EU, as confirmed in the Renesas ordering information and green parts documentation.
IDT71256SA12Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 12ns
- Access Time:
- 12 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
IDT71256SA12Y FAQ
1.How can I place an order for IDT71256SA12Y through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA12Y on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for IDT71256SA12Y reliable?
The price and inventory of IDT71256SA12Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA12Y is usually 5 days.
3.What payment methods are accepted for IDT71256SA12Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA12Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA12Y?
IDT71256SA12Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA12Y order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for IDT71256SA12Y?
For technical support, including IDT71256SA12Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA12Y requirements.
6.How does Aetrix verify that IDT71256SA12Y is sourced from the original manufacturer or authorized distributors?
All IDT71256SA12Y products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IDT71256SA12Y meets industry standards.
7.What is the process for return or replacement of IDT71256SA12Y?
All IDT71256SA12Y units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA12Y, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The IDT71256SA12Y part is unused and in its original packaging.
Return procedure for IDT71256SA12Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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