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Renesas IDT71256SA25Y
- Part No.:
- IDT71256SA25Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
IDT71256SA25Y.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,509
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Product details
Overview
IDT71256SA25Y from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with 25 ns access time, industrial temperature range (–40°C to +85°C), TTL-compatible I/O, single 5 V supply operation, and 28-pin 300-mil plastic SOJ (PJG28) package. It serves as a non-refreshing, fully static memory buffer in embedded controllers and legacy industrial systems requiring deterministic timing.
For engineers reviewing the IDT71256SA25Y datasheet, IDT71256SA25Y pinout, IDT71256SA25Y application, or IDT71256SA25Y equivalent, key selection criteria include guaranteed tAA ≤ 25 ns at –40°C to +85°C, ISB1 standby current of 15 mA, bidirectional TTL-compatible I/Os, CS/OE dual-enable read control, and compatibility with legacy 5 V bus architectures.
Technical Context
The IDT71256SA25Y implements fully static asynchronous circuitry-no clocks or refresh required-with independent chip select (CS) and output enable (OE) controls enabling flexible read gating. Its address decoder supports 15-bit addressing (A0–A14) for 32K word selection, and bidirectional I/O lines (I/O0–I/O7) share a common data bus with TTL-level thresholds (VIH = 2.2 V min, VIL = 0.8 V max).
It operates across VCC = 4.5 V to 5.5 V with dynamic ICC = 145 mA at fMAX and ultra-low ISB1 = 15 mA when CS is held above VHC (CMOS-level deselect), making it suitable for low-power active-standby cycling in programmable logic controllers and instrumentation front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data transfers without interleaving or banking logic |
| Access Time (tAA) | 25 ns max over –40°C to +85°C; ensures predictable read latency in real-time control loops |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails and legacy power domains |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V, CMOS-level CS deselect; enables low-power sleep modes without external regulators |
| I/O Interface | TTL-compatible inputs/outputs (VIH ≥ 2.2 V, VIL ≤ 0.8 V); eliminates level-shifting in mixed-logic systems |
| Operating Temperature | –40°C to +85°C industrial grade; validated for deployment in factory automation and outdoor telemetry enclosures |
| Package | 28-pin 300-mil plastic SOJ (PJG28); surface-mount compatible with wave-solder and reflow profiles per JEDEC MS-012 |
Pinout & Package
Package: 28-pin 300-mil plastic SOJ (PJG28), gull-wing lead form, body width 300 mil, compliant with JEDEC MO-050AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit unidirectional address bus; latched internally on CS low transition; no external address latch required |
| I/O0–I/O7 | Bidirectional Data I/O | 8-bit shared data path; direction controlled by WE and CS; TTL-compatible drive strength (IOH = –4 mA, IOL = 8 mA) |
| CS | Chip Select | Active-low primary enable; device enters high-Z standby (ISB1) when > VHC; enables multi-chip memory decoding |
| OE | Output Enable | Active-low secondary read control; allows output gating independent of CS; tOE = 11 ns max ensures fast read strobing |
| WE | Write Enable | Active-low write control; initiates write cycle only when CS = L; tWP = 20 ns min prevents partial writes |
| VCC | Power Supply | +5 V supply pin; decoupling capacitor (0.1 µF) recommended within 10 mm of pin for noise immunity |
| GND | Ground Reference | Signal and power ground return; must be connected to system ground plane with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Zero-refresh static architecture | Eliminates external refresh circuitry and timing constraints-ideal for FPGA-based controllers with limited resource headroom |
| Dual-enable read control (CS + OE) | Enables precise output gating for shared-bus arbitration without bus contention during multi-device reads |
| CMOS-level standby (ISB1) | Reduces quiescent current to 15 mA when CS > VHC, supporting energy-aware wake-on-event designs |
| TTL-compatible I/O thresholds | Direct interface with 74LS/74ALS logic families and microcontroller GPIOs without level translators |
| Industrial temperature validation | Guaranteed AC/DC parameters across –40°C to +85°C-qualified for DIN rail-mounted PLC modules and motor drives |
Applications
| Programmable Logic Controller (PLC) Data Buffer | Legacy Industrial HMI Memory |
|---|---|
Use Scenario: Stores I/O mapping tables and runtime variable buffers in modular PLC backplanes operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile shadow RAM holding configuration data; accessed asynchronously during scan cycles with strict 25 ns tAA timing budget. Use Value: Eliminates need for external wait-state generators due to guaranteed 25 ns access across full industrial temperature range. |
Use Scenario: Serves as display frame buffer and command queue memory in panel-mounted HMIs using 8051 or Z80 derivatives. IC Role / Device Role / Timing Role: Byte-accessible scratchpad memory interfaced directly to 8-bit data bus; enabled via discrete CS/OE decoding. Use Value: TTL-compatible I/Os and 5 V operation allow drop-in replacement of obsolete 27C256 EPROMs in field-upgraded units. |
| Test Equipment Pattern Memory | Avionics Maintenance Terminal RAM |
Use Scenario: Holds digital stimulus patterns and expected response vectors in automated test sets for PCB functional verification. IC Role / Device Role / Timing Role: High-reliability static RAM used in pattern sequencer subsystem; accessed under tight timing windows during vector execution. Use Value: 25 ns tAA and 25 ns tWC guarantee deterministic pattern delivery without pipeline stalls or retry logic. |
Use Scenario: Provides volatile working memory in portable avionics line-replaceable units (LRUs) performing diagnostic boot sequences. IC Role / Device Role / Timing Role: Primary RAM for BIOS-like startup code execution; powered from regulated 5 V aircraft bus with thermal derating. Use Value: –40°C to +85°C qualification and ISB1 = 15 mA support cold-soak start-up and extended idle periods between maintenance checks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256BNLL-70SNXC | 70 ns access time, 32K × 8, 5 V, SOJ-28; higher tAA limits use in timing-critical control loops | Targeted at cost-sensitive consumer electronics-not qualified for industrial temperature operation | Select only if system timing budget exceeds 70 ns and ambient temperature stays within 0°C to 70°C |
| AS6C4008-25ZIN | 25 ns access, 512K × 8, 3.3 V core; requires level shifters for 5 V bus interfaces and has different pinout | Designed for modern low-voltage embedded systems; lacks industrial temp grade and TTL compatibility | Use only with voltage translation and layout revision; not a drop-in replacement for IDT71256SA25Y |
Compared with CY62256BNLL-70SNXC and AS6C4008-25ZIN, the IDT71256SA25Y uniquely delivers 25 ns access at industrial temperature with native 5 V TTL I/O-enabling direct integration into legacy 5 V control systems without redesign or voltage adaptation.
Availability
IDT71256SA25Y is available at Aetrix Electronics and suitable for programmable logic controllers, industrial HMIs, automated test equipment, and avionics maintenance terminals requiring stable component supply across extended product lifecycles.
Supply support for IDT71256SA25Y 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 IDT71256SA25Y belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for industrial and aerospace applications demanding deterministic timing, wide temperature operation, and long-term supply stability.
FAQ
What is the maximum guaranteed access time for IDT71256SA25Y across its full operating temperature range?
The IDT71256SA25Y guarantees tAA ≤ 25 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 per AC Electrical Characteristics Table 9 in the Renesas datasheet, ensuring deterministic read latency without derating in harsh environments where the IDT71256SA25Y is deployed.
Does IDT71256SA25Y require an external clock or refresh signal to retain data?
No, the IDT71256SA25Y uses fully static CMOS memory cells and requires no clock, refresh, or periodic access to retain data. As long as VCC remains within 4.5 V to 5.5 V and temperature stays within –40°C to +85°C, data persists indefinitely in standby-making the IDT71256SA25Y ideal for battery-backed or intermittently powered systems.
Can IDT71256SA25Y be interfaced directly with a 3.3 V microcontroller without level shifting?
No-IDT71256SA25Y is a 5 V-only device with TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and 5 V output swing. Driving its inputs from a 3.3 V MCU may violate VIH minimum under worst-case conditions; likewise, its 5 V outputs exceed 3.3 V I/O absolute maximum ratings. A level translator is required for safe interfacing with 3.3 V logic, unlike the IDT71256SA25Y's native 5 V domain.
What is the difference between ISB and ISB1 current specifications for IDT71256SA25Y?
ISB (50 mA max) applies when CS is pulled to TTL-high (> VHC ≈ 4.8 V at VCC = 5.5 V), while ISB1 (15 mA max) applies when CS is driven to CMOS-high (> VHC = VCC – 0.2 V). The IDT71256SA25Y achieves lower standby power only when CS is actively driven to near-VCC-enabling deeper power savings in systems with programmable GPIOs capable of full-rail control of the IDT71256SA25Y's chip select line.
Is IDT71256SA25Y RoHS-compliant and halogen-free?
Yes-the IDT71256SA25Y is a "Green" part per Renesas ordering information, meaning it meets RoHS Directive 2011/65/EU and is halogen-free (Br < 900 ppm, Cl < 900 ppm, total halogens < 1500 ppm). This compliance is verified in the "Ordering Information" section of the June 2020 Renesas datasheet, confirming suitability for environmentally regulated industrial and medical equipment using the IDT71256SA25Y.
IDT71256SA25Y 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:
- 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
IDT71256SA25Y FAQ
1.How can I place an order for IDT71256SA25Y through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA25Y 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 IDT71256SA25Y reliable?
The price and inventory of IDT71256SA25Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA25Y is usually 5 days.
3.What payment methods are accepted for IDT71256SA25Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA25Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA25Y?
IDT71256SA25Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA25Y 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 IDT71256SA25Y?
For technical support, including IDT71256SA25Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA25Y requirements.
6.How does Aetrix verify that IDT71256SA25Y is sourced from the original manufacturer or authorized distributors?
All IDT71256SA25Y 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 IDT71256SA25Y meets industry standards.
7.What is the process for return or replacement of IDT71256SA25Y?
All IDT71256SA25Y units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA25Y, 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 IDT71256SA25Y part is unused and in its original packaging.
Return procedure for IDT71256SA25Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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