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Renesas IDT71256SA25Y8
- Part No.:
- IDT71256SA25Y8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
IDT71256SA25Y8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,192
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Product details
Overview
IDT71256SA25Y8 from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 25 ns access time, industrial temperature range (–40°C to +85°C), TTL-compatible I/O, and single 5 V supply operation. 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 IDT71256SA25Y8 datasheet, IDT71256SA25Y8 pinout, IDT71256SA25Y8 application, or IDT71256SA25Y8 equivalent, key selection criteria include industrial-grade timing consistency, 28-pin SOJ package compatibility, 5 V-only operation, and asynchronous static RAM interface behavior without refresh or clocking requirements.
Technical Context
The IDT71256SA25Y8 implements fully static asynchronous circuitry - no clocks, no refresh cycles - relying on address-stable read/write control via CS, OE, and WE. Its internal architecture includes a 262,144-bit memory array, address decoder, I/O control logic, and TTL-compatible input/output buffers.
All inputs meet VIH ≥ 2.2 V and VIL ≤ 0.8 V at VCC = 5.0 V ±10%; outputs drive VOH ≥ 2.4 V at –4 mA and VOL ≤ 0.4 V at 8 mA. Standby current drops to ISB1 = 15 mA under CMOS-level deselection (CS > VHC), enabling power-sensitive industrial hold states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), byte-wide parallel interface |
| Access Time (tAA) | 25 ns max - defines minimum address-to-data-valid delay in read cycles |
| Cycle Time (tRC) | 25 ns max - sets shortest interval between successive read or write operations |
| Supply Voltage | 4.5 V to 5.5 V - requires stable 5 V rail; no dual-supply or voltage scaling support |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Package | 28-pin 300-mil Plastic SOJ (PJG28) - surface-mount, gull-wing leads, JEDEC MO-029 compliant |
| Power Consumption | ISB1 = 15 mA max in CMOS-level standby - enables low-quiescent power during idle periods |
Pinout & Package
Package: 28-pin 300-mil Plastic SOJ (PJG28), gull-wing lead form, body width 300 mil (7.62 mm), lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus selecting one of 32,768 memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and CS |
| CS | Chip Select | Active-low enable; device enters standby (high-Z outputs) when high |
| OE | Output Enable | Active-low control for output drivers; allows read data gating independent of CS |
| WE | Write Enable | Active-low signal initiating write cycle; latches data on falling edge when CS is low |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin per layout guidelines |
| GND | Ground Reference | Signal and power ground return; must be low-impedance plane connection |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | No clocks or refresh needed - simplifies timing-critical control logic design |
| TTL-compatible I/O levels | Direct interfacing with 5 V microcontrollers and FPGAs without level-shifting |
| Dual standby modes (TTL/CMOS) | ISB = 40 mA (TTL-level CS) or ISB1 = 15 mA (CMOS-level CS) - selectable power savings |
| Industrial temperature qualification | Guaranteed 25 ns timing across –40°C to +85°C - suitable for uncontrolled ambient deployments |
| Green (RoHS-compliant) packaging | PJG28 package meets lead-free and halogen-free requirements per Renesas green policy |
Applications
| Industrial PLC Data Buffer | Legacy Medical Instrument Memory |
|---|---|
|
Use Scenario: Storing real-time sensor acquisition buffers and configuration registers in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Asynchronous SRAM providing deterministic 25 ns read/write latency for cyclic data logging without CPU intervention. Use Value: Enables deterministic response to fieldbus interrupts by eliminating DRAM refresh jitter and supporting direct bus-mastered access. |
Use Scenario: Holding calibration tables and waveform history in portable diagnostic devices requiring long-term reliability and thermal stability. IC Role / Device Role / Timing Role: Non-refreshing memory storing critical firmware parameters and patient data snapshots during battery-backed operation. Use Value: Maintains data integrity over extended thermal cycling (–40°C to +85°C) without periodic refresh overhead or capacitor-based backup. |
| Avionics Test Equipment Cache | Telecom Line Card Boot Memory |
|
Use Scenario: Acting as fast instruction/data cache in ground-support test systems verifying avionics LRUs before flight deployment. IC Role / Device Role / Timing Role: Byte-accessible SRAM interfaced directly to FPGA-based bus controllers for rapid register mapping and trace capture. Use Value: Delivers 25 ns access with zero wait states - accelerating self-test execution and reducing overall verification cycle time. |
Use Scenario: Storing boot code and initialization vectors for telecom line cards in carrier-grade DSLAMs and ONU hardware. IC Role / Device Role / Timing Role: Primary non-volatile boot memory accessed during cold start before flash controller initialization. Use Value: Provides immediate, deterministic access to first-stage bootloader - avoiding flash latency bottlenecks during power-up sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZSXIT | 32K × 8-bit, 45 ns access, 3.3 V only, TSOP-28 package | Requires 3.3 V supply and lacks industrial temp support at 45 ns speed grade | Select only if system uses 3.3 V logic and timing budget allows 45 ns latency |
| AS6C4008-25ZIN | 512K × 8-bit, 25 ns access, industrial temp, SOJ-28, 5 V compatible | Higher density (512K vs. 32K); pinout differs - not drop-in compatible | Choose when memory expansion is needed and board layout permits re-routing |
Compared with IDT71256SA25Y8, CY62128EV30LL-45ZSXIT trades speed and voltage compatibility for lower cost in 3.3 V systems, while AS6C4008-25ZIN offers greater capacity but requires PCB redesign due to different address/data pin mapping.
Availability
IDT71256SA25Y8 is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy medical instrument memory, avionics test equipment caching, and telecom line card boot memory requiring stable component supply across extended temperature ranges.
Supply support for IDT71256SA25Y8 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 is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.
IDT71256SA25Y8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for industrial and telecom applications demanding deterministic timing, 5 V compatibility, and long-lifecycle availability.
FAQ
What is the operating voltage range for IDT71256SA25Y8?
IDT71256SA25Y8 operates from 4.5 V to 5.5 V DC. It is strictly a 5 V device - no 3.3 V or mixed-voltage operation is supported. The datasheet specifies VIH ≥ 2.2 V and VIL ≤ 0.8 V under these conditions, ensuring reliable TTL-level interfacing with legacy 5 V microcontrollers and FPGAs. Operation outside this range may cause data corruption or permanent damage.
Does IDT71256SA25Y8 require a clock or refresh signal?
No, IDT71256SA25Y8 uses fully static asynchronous circuitry and requires neither a clock nor periodic refresh. Data retention is maintained as long as VCC remains within specification and CS is held active (low) during access. This eliminates timing constraints associated with DRAM controllers and simplifies integration into FPGA- or microcontroller-based systems with tight timing budgets.
What package type does IDT71256SA25Y8 use?
IDT71256SA25Y8 is packaged in a 28-pin 300-mil Plastic SOJ (PJG28), a gull-wing surface-mount package compliant with JEDEC MO-029. It features 1.27 mm lead pitch and is RoHS-compliant (green). This package is compatible with standard reflow profiles and supports automated optical inspection (AOI) due to its exposed lead geometry.
Is IDT71256SA25Y8 suitable for industrial temperature applications?
Yes, IDT71256SA25Y8 is explicitly qualified for the industrial temperature range of –40°C to +85°C. All AC and DC specifications - including 25 ns access time, ISB1 = 15 mA standby current, and TTL-compatible I/O thresholds - are guaranteed across this full range. No derating or additional thermal margining is required for deployment in uncontrolled ambient environments.
How does the Output Enable (OE) pin function in IDT71256SA25Y8?
In IDT71256SA25Y8, the OE pin is an active-low signal that independently controls output driver enablement during read cycles. When CS is low and OE is low, data appears on I/O0–I/O7 within tOE (max 11 ns). When OE is high, outputs enter high-impedance state regardless of CS status - enabling multi-drop bus sharing and clean read/write isolation without toggling CS.
IDT71256SA25Y8 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:
- 25ns
- Access Time:
- 25 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
IDT71256SA25Y8 FAQ
1.How can I place an order for IDT71256SA25Y8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA25Y8 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 IDT71256SA25Y8 reliable?
The price and inventory of IDT71256SA25Y8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA25Y8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA25Y8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA25Y8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA25Y8?
IDT71256SA25Y8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA25Y8 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 IDT71256SA25Y8?
For technical support, including IDT71256SA25Y8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA25Y8 requirements.
6.How does Aetrix verify that IDT71256SA25Y8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA25Y8 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 IDT71256SA25Y8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA25Y8?
All IDT71256SA25Y8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA25Y8, 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 IDT71256SA25Y8 part is unused and in its original packaging.
Return procedure for IDT71256SA25Y8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA25Y8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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