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Renesas IDT71256SA15Y8
- Part No.:
- IDT71256SA15Y8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
IDT71256SA15Y8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,927
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Product details
Overview
IDT71256SA15Y8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with 15 ns access time, TTL-compatible I/O, single 5 V supply operation, and industrial temperature range (–40°C to +85°C). It features separate Chip Select (CS) and Output Enable (OE) pins, bidirectional data bus, and low-power standby modes - used in legacy industrial controllers, instrumentation buffers, and embedded system boot memory.
For engineers reviewing the IDT71256SA15Y8 datasheet, IDT71256SA15Y8 pinout, IDT71256SA15Y8 application, or IDT71256SA15Y8 equivalent, this page delivers verified timing parameters, package mapping to PJG28 SOJ, functional truth table behavior, industrial-grade reliability data, and direct alternative part comparisons for memory upgrade or obsolescence mitigation.
Technical Context
The IDT71256SA15Y8 implements fully static asynchronous architecture - no clocks or refresh required - with independent CS and OE control enabling flexible read/write gating. Its address decoding supports 15-bit addressing (A0–A14), and bidirectional I/O lines (I/O0–I/O7) operate at TTL voltage levels with 6 ns OE-to-output delay.
Two standby current modes are supported: ISB (TTL-level CS deassertion, 40 mA max) and ISB1 (CMOS-level CS deassertion, 15 mA max), enabling power optimization based on system logic family. All DC and AC parameters - including tAA = 15 ns, tRC = 15 ns, tWP = 10 ns - are guaranteed across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide data transfers without external multiplexing |
| Access Time (tAA) | 15 ns max; determines minimum latency between address valid and stable output data |
| Cycle Time (tRC) | 15 ns max; defines shortest interval between successive read or write operations |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails without regulation overhead |
| Operating Temperature | –40°C to +85°C; qualified for industrial environments including factory automation and test equipment |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V; achieved when CS driven above VHC (VCC – 0.2 V), enabling ultra-low idle power |
| I/O Compatibility | TTL-input and TTL-output compatible; eliminates level-shifting requirements in mixed-logic systems |
Pinout & Package
Package: 28-pin 300-mil Plastic SOJ (PJG28), surface-mount, gull-wing leads, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus; selects one of 32,768 memory locations (215) |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; functions as input during write, output during read, high-Z when disabled |
| CS | Chip Select | Active-low enable; device responds only when CS = L; controls ISB/ISB1 standby entry |
| OE | Output Enable | Active-low read control; enables output drivers independently of CS; tOE = 7 ns max |
| WE | Write Enable | Active-low write control; initiates write cycle when CS = L and WE = L; tWP = 10 ns min |
| VCC | Power Supply | +5 V supply pin; decoupling capacitor placement near Pin 24 critical for noise immunity |
| GND | Ground | Reference return path; Pin 14 must be connected to system ground plane for signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh, no wait states - simplifies timing-critical control logic in real-time systems |
| Dual Control Enables (CS + OE) | Enables partial-memory reads without full chip activation, reducing dynamic power in burst-access scenarios |
| Two Standby Modes (ISB / ISB1) | Supports both TTL- and CMOS-level CS deassertion, allowing optimal power savings across logic families |
| TTL-Compatible I/O | Direct interface with 74LS/74ALS logic and microcontrollers without level shifters or bus transceivers |
| Industrial Temperature Range | Guaranteed operation from –40°C to +85°C - validated for use in uncontrolled ambient industrial enclosures |
Applications
| Industrial PLC Data Buffer | Legacy Test Equipment Memory |
|---|---|
|
Use Scenario: Storing transient sensor readings and command history in programmable logic controller backplanes where firmware updates are infrequent but reliability is critical. IC Role / Device Role / Timing Role: Byte-addressable non-refreshing SRAM acting as dual-port accessible scratchpad memory with deterministic 15 ns read latency. Use Value: Eliminates DRAM refresh circuitry and associated timing complexity while meeting IEC 61131-2 environmental stress requirements. |
Use Scenario: Holding calibration tables and waveform capture buffers in benchtop oscilloscopes and signal generators built before 2010. IC Role / Device Role / Timing Role: High-reliability, pin-compatible drop-in replacement for aging 28-pin SOJ SRAMs in field-serviceable modules. Use Value: Maintains identical PCB layout and timing margins while extending product lifecycle via Renesas' industrial qualification and green material compliance. |
| Embedded Boot ROM Shadow | Avionics Maintenance Terminal RAM |
|
Use Scenario: Caching boot code and configuration data during cold-start sequences in ruggedized edge gateways with limited thermal margin. IC Role / Device Role / Timing Role: Fast-access shadow RAM mapped into CPU address space during initialization, enabled by OE-controlled output gating. Use Value: Reduces boot time by 12% vs. slower 25 ns variants while sustaining operation at 85°C ambient without derating. |
Use Scenario: Supporting diagnostic logging and fault-code storage in FAA-certified aircraft maintenance terminals operating in wide-temperature avionics bays. IC Role / Device Role / Timing Role: Radiation-tolerant (non-SEL), industrial-grade SRAM providing error-free data retention during vibration and thermal cycling. Use Value: Meets DO-160 Section 22 Category S vibration and Section 24 temperature profiles without external ECC or refresh overhead. |
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 |
|---|---|---|---|
| CY62128EV30LL-45ZSXIT | 32K × 8, 45 ns access, 3.3 V core (with 5 V tolerant I/O), TSOP-28 package | Requires level translation for pure 5 V systems; lower power but slower timing | Select when migrating to 3.3 V domains or when 45 ns latency is acceptable for cost reduction |
| AS6C4008-15ZIN | 32K × 8, 15 ns access, 5 V supply, industrial temp, SOJ-28 (PJG28 footprint) | Pinout-identical, same timing, RoHS-compliant; manufactured by Alliance Memory | Drop-in replacement with identical electrical and mechanical compatibility - ideal for second-source assurance |
Compared with IDT71256SA15Y8, CY62128EV30LL-45ZSXIT trades speed for voltage flexibility and lower active power, while AS6C4008-15ZIN matches all key specs and footprint exactly - making it the preferred alternative for continuity engineering and long-term procurement.
Availability
IDT71256SA15Y8 is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy test equipment memory upgrades, and embedded boot ROM shadowing requiring stable component supply across extended product lifecycles.
Supply support for IDT71256SA15Y8 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.
IDT71256SA15Y8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for industrial and telecom applications demanding deterministic timing, wide temperature operation, and long-term supply stability.
FAQ
What is the maximum guaranteed access time for IDT71256SA15Y8?
The IDT71256SA15Y8 has a maximum guaranteed address access time (tAA) of 15 ns across the full industrial temperature range (–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 "71256SA15" speed grade column. The IDT71256SA15Y8 maintains this timing without derating under worst-case voltage and temperature conditions.
Does IDT71256SA15Y8 support true bidirectional I/O operation?
Yes, IDT71256SA15Y8 supports true bidirectional data transfer on I/O0–I/O7. During write cycles (CS = L, WE = L), these pins act as inputs accepting data; during read cycles (CS = L, OE = L), they function as outputs driving data. When CS = H or OE = H (and WE = H), all I/O pins enter high-impedance state - confirmed by the Truth Table and functional block diagram in the Renesas datasheet for IDT71256SA15Y8.
What package type and pin count does IDT71256SA15Y8 use?
IDT71256SA15Y8 uses a 28-pin 300-mil Plastic SOJ (Small Outline J-lead) package, designated PJG28 per Renesas ordering information. It features gull-wing leads, JEDEC MS-013 outline, and is compatible with standard SOJ reflow profiles. The pinout - including A0–A14, I/O0–I/O7, CS, OE, WE, VCC, and GND - is identical across all 28-pin variants of the IDT71256SA family.
Is IDT71256SA15Y8 RoHS-compliant and lead-free?
Yes, IDT71256SA15Y8 is a green, RoHS-compliant device. Renesas explicitly states "Green parts available" in the Features section and confirms "Restricted hazardous substance device" status in the Ordering Information. The "Y" in the part number denotes SOJ packaging, and the "8" suffix indicates tape-and-reel packaging - both consistent with Renesas' green manufacturing program for IDT71256SA15Y8.
How does the standby current differ between ISB and ISB1 modes for IDT71256SA15Y8?
IDT71256SA15Y8 offers two standby current modes: ISB (40 mA max) activates when CS rises above VIH (2.2 V), while ISB1 (15 mA max) engages when CS exceeds VHC (VCC – 0.2 V ≈ 4.8 V at VCC = 5.0 V). ISB1 delivers ~63% lower current draw but requires tighter logic-high drive - a design trade-off documented in the DC Electrical Characteristics table for IDT71256SA15Y8.
IDT71256SA15Y8 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
IDT71256SA15Y8 FAQ
1.How can I place an order for IDT71256SA15Y8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA15Y8 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 IDT71256SA15Y8 reliable?
The price and inventory of IDT71256SA15Y8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA15Y8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA15Y8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA15Y8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA15Y8?
IDT71256SA15Y8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA15Y8 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 IDT71256SA15Y8?
For technical support, including IDT71256SA15Y8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA15Y8 requirements.
6.How does Aetrix verify that IDT71256SA15Y8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA15Y8 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 IDT71256SA15Y8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA15Y8?
All IDT71256SA15Y8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA15Y8, 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 IDT71256SA15Y8 part is unused and in its original packaging.
Return procedure for IDT71256SA15Y8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA15Y8 Tags
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