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Renesas IDT71256SA15YI8
- Part No.:
- IDT71256SA15YI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
IDT71256SA15YI8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,957
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Product details
Overview
IDT71256SA15YI8 from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 15 ns access time, TTL-compatible I/O, single 5 V supply operation, and dual enable control (CS and OE). It serves as main or cache memory in embedded controllers, data acquisition systems, and real-time communication buffers requiring deterministic, no-refresh asynchronous access.
For engineers reviewing the IDT71256SA15YI8 datasheet, IDT71256SA15YI8 pinout, IDT71256SA15YI8 application, or IDT71256SA15YI8 equivalent, this device delivers verified 15 ns read/write cycle timing, low-standby current (ISB1 = 15 mA), and industrial-grade reliability in 28-pin SOJ packaging - critical for legacy industrial control upgrades and long-lifecycle instrumentation designs.
Technical Context
The IDT71256SA15YI8 implements fully static asynchronous architecture with no clocks or refresh required. Its address decoding, I/O control, and output enable logic are integrated on-die, supporting independent chip select (CS) and output enable (OE) assertion for flexible bus arbitration and partial-memory disable.
It operates across VCC = 4.5 V to 5.5 V with TTL-level input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and guarantees bidirectional I/O drive strength (IOL = 8 mA, IOH = –4 mA). Standby modes include TTL-level ISB (40 mA) and CMOS-level ISB1 (15 mA), activated by CS high at VIH or VHC respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data interface without external data multiplexing |
| Access Time (tAA) | 15 ns max; ensures deterministic read latency under worst-case industrial temperature and voltage conditions |
| Read Cycle Time (tRC) | 15 ns max; defines minimum interval between successive read operations on same address space |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS system rails without regulation overhead |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V; enables low-power hold mode when CS driven above VHC (VCC – 0.2 V) |
| I/O Compatibility | TTL-input and TTL-output compatible; eliminates level-shifting requirements in mixed-logic systems |
| Operating Temperature | –40°C to +85°C; qualified for deployment in uncontrolled industrial enclosures and outdoor telemetry hardware |
Pinout & Package
IDT71256SA15YI8 is packaged in a 28-pin 300-mil Plastic SOJ (PJG28), with gull-wing leads, JEDEC MO-050 compliant footprint, and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting full 32K-word range; latched internally on CS or WE transition |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by CS/WE/OE states per truth table |
| CS | Chip Select | Active-low enable for memory access; deassertion places outputs in high-Z and enters standby (ISB or ISB1) |
| OE | Output Enable | Active-low control of data output drivers only; allows write operations while disabling reads (e.g., bus sharing) |
| WE | Write Enable | Active-low signal qualifying write cycles; combined with CS LOW to initiate data latch into memory array |
| VCC | Power Supply | +5 V supply pin; requires local 0.1 µF ceramic decoupling per JEDEC guidelines |
| GND | Ground | Signal and power return reference; must be connected to system ground plane with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh, no wait states - simplifies timing-critical control firmware and eliminates DRAM controller overhead |
| Dual Enable Architecture (CS + OE) | Enables selective read gating without disabling writes, supporting shared-bus protocols like ISA or custom backplanes |
| Industrial Temperature Range | –40°C to +85°C qualification ensures functional stability in factory automation PLCs and railway signaling hardware |
| Low CMOS Standby Current (ISB1) | 15 mA max enables energy-efficient sleep modes in battery-backed data loggers and portable test equipment |
| TTL-Compatible Interface | Direct connection to legacy microcontrollers (e.g., 8051, Z80, 68K) and FPGAs without level translators or bus buffers |
Applications
| Industrial PLC Memory Expansion | Medical Instrumentation Data Buffer |
|---|---|
Use Scenario: Adding non-volatile-capable fast memory to programmable logic controller modules for recipe storage and real-time tag history. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state read/write access to CPU during scan-cycle execution and interrupt servicing. Use Value: 15 ns tAA ensures deterministic response within 100 µs scan cycles; industrial temp rating avoids derating in cabinet-mounted controllers. |
Use Scenario: Capturing high-fidelity analog waveform samples from ECG or EEG front-ends before DSP processing or storage. IC Role / Device Role / Timing Role: High-speed circular buffer holding up to 32 KB of raw sensor data with burst-write capability and glitch-free readout. Use Value: Bidirectional I/O and OE-controlled output disable prevent bus contention during concurrent ADC sampling and CPU readback. |
| Avionics Test Equipment Firmware Cache | Legacy Communication Protocol Bridge |
Use Scenario: Caching configuration tables and lookup data for airborne diagnostic units operating under DO-254 constraints. IC Role / Device Role / Timing Role: Read-only cache for FPGA-based protocol engines, accessed via dedicated address/data bus with fixed latency. Use Value: 15 ns tAA and tRC guarantee predictable timing margins for safety-critical timing analysis; green (RoHS) compliance meets aerospace material specs. |
Use Scenario: Interfacing legacy RS-232/422 UART peripherals to modern ARM-based host processors in telecom line cards. IC Role / Device Role / Timing Role: Glue logic memory for protocol translation state machines, storing command/response templates and CRC tables. Use Value: TTL compatibility eliminates level shifters; SOJ package supports rework-friendly through-hole replacement in field-upgradeable modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZAXI | 32K × 8-bit, 45 ns access, 3.3 V core (with 5 V tolerant I/O), industrial temp, 28-pin TSOP | Lower speed but lower voltage; requires level translation if interfaced to pure 5 V systems | Select when migrating to 3.3 V systems or when 45 ns latency is acceptable for cost reduction |
| AS6C4008-15ZIN | 32K × 8-bit, 15 ns access, 5 V operation, industrial temp, 28-pin SOJ - pinout identical to IDT71256SA15YI8 | Drop-in replacement with same timing, package, and pinout; validated for extended life-cycle support | Preferred for new designs where IDT71256SA15YI8 availability is constrained; no PCB changes required |
Compared with CY62128EV30LL-45ZAXI and AS6C4008-15ZIN, the IDT71256SA15YI8 offers guaranteed 15 ns performance at 5 V with proven industrial reliability, while AS6C4008-15ZIN provides seamless migration path and CY62128EV30LL-45ZAXI enables voltage scaling at latency cost.
Availability
IDT71256SA15YI8 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, avionics test equipment, and legacy communication protocol bridge designs requiring stable component supply and long-term obsolescence management.
Supply support for IDT71256SA15YI8 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, infrastructure, and IoT applications.
IDT71256SA15YI8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for industrial and communications systems needing reliable, no-refresh, 5 V-compatible memory with deterministic timing and extended temperature operation.
FAQ
What is the maximum operating frequency supported by IDT71256SA15YI8?
IDT71256SA15YI8 does not use a clock and therefore has no operating frequency specification. Its performance is defined by timing parameters: minimum read cycle time (tRC) is 15 ns, enabling up to ~66.7 MHz burst access rate in ideal conditions. Real-world throughput depends on system bus protocol, address setup, and control signal timing margins - all specified in the AC Electrical Characteristics table of the Renesas datasheet for IDT71256SA15YI8.
Does IDT71256SA15YI8 require external refresh circuitry?
No, IDT71256SA15YI8 is a fully static RAM and requires no refresh circuitry. Its internal CMOS latches retain data indefinitely as long as VCC is maintained within 4.5 V–5.5 V and ambient temperature remains within –40°C to +85°C. This eliminates refresh overhead in firmware and simplifies hardware design versus DRAM solutions - a key feature confirmed in the Functional Description section of the IDT71256SA15YI8 datasheet.
Can IDT71256SA15YI8 operate with a 3.3 V supply?
No, IDT71256SA15YI8 is specified only for 4.5 V to 5.5 V operation. Applying 3.3 V violates the Absolute Maximum Ratings and will result in undefined behavior, including failure to meet 15 ns timing, increased leakage, or inability to retain data. For 3.3 V systems, consider functionally similar alternatives like the AS6C4008-15ZIN (5 V tolerant) or CY62128EV30LL-45ZAXI (3.3 V core), both documented as alternatives for IDT71256SA15YI8.
What is the meaning of "YI8" in the part number IDT71256SA15YI8?
In IDT71256SA15YI8, "Y" denotes 28-pin 300-mil Plastic SOJ (PJG28) package, "I" indicates Industrial temperature grade (–40°C to +85°C), and "8" specifies tape-and-reel packaging format. This coding aligns with Renesas' Ordering Information table, where YGI8 explicitly maps to PJG28 SOJ, Industrial temp, and tape-and-reel - confirming the physical and environmental specifications of the IDT71256SA15YI8 unit shipped by Aetrix Electronics.
Is IDT71256SA15YI8 RoHS compliant and lead-free?
Yes, IDT71256SA15YI8 is a green (RoHS-compliant and lead-free) device, as stated in the Renesas datasheet revision dated June 29, 2020, under "Ordering Information" and "Features". The "G" suffix in package codes (e.g., PZG, YG) explicitly denotes green compliance, and IDT71256SA15YI8 carries the "Green parts available" designation - meeting EU RoHS Directive 2011/65/EU and JEDEC JS-001 ESD standards without exemption.
IDT71256SA15YI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
IDT71256SA15YI8 FAQ
1.How can I place an order for IDT71256SA15YI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA15YI8 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 IDT71256SA15YI8 reliable?
The price and inventory of IDT71256SA15YI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA15YI8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA15YI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA15YI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA15YI8?
IDT71256SA15YI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA15YI8 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 IDT71256SA15YI8?
For technical support, including IDT71256SA15YI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA15YI8 requirements.
6.How does Aetrix verify that IDT71256SA15YI8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA15YI8 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 IDT71256SA15YI8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA15YI8?
All IDT71256SA15YI8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA15YI8, 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 IDT71256SA15YI8 part is unused and in its original packaging.
Return procedure for IDT71256SA15YI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA15YI8 Tags
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AT24C02C-XHM-T
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