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Renesas IDT71256SA15PZI8
- Part No.:
- IDT71256SA15PZI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA15PZI8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,631
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Product details
Overview
IDT71256SA15PZI8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) 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 TSOP-28 package. It serves as main or buffer memory in real-time control systems requiring deterministic, no-refresh asynchronous read/write.
For engineers reviewing the IDT71256SA15PZI8 datasheet, IDT71256SA15PZI8 pinout, IDT71256SA15PZI8 application, or IDT71256SA15PZI8 equivalent, key selection criteria include industrial-grade timing consistency, low standby current (ISB1 = 15 mA), bidirectional TTL I/O compatibility, and TSOP-28 footprint suitability for space-constrained embedded controllers.
Technical Context
The IDT71256SA15PZI8 implements fully static asynchronous circuitry-no clocks or refresh required-and uses dual-control enable logic with independent Chip Select (CS) and Output Enable (OE) inputs to manage data bus contention and power state transitions. Its architecture supports both CS-controlled and OE-controlled read cycles, enabling flexible timing integration in microprocessor and microcontroller bus interfaces.
It features two distinct standby modes: ISB (TTL-level CS deassertion, 40 mA max) and ISB1 (CMOS-level CS deassertion, 15 mA max), allowing system-level power optimization based on control signal drive capability. All 15 ns timing parameters-including tAA, tRC, tACS, and tOE-are guaranteed across the full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data transfer without multiplexing. |
| Access Time (tAA) | 15 ns max at VCC = 4.5–5.5 V and TA = –40°C to +85°C; ensures deterministic latency in hard real-time interrupt handlers. |
| Supply Voltage | 4.5 V to 5.5 V; compatible with legacy 5 V TTL/CMOS bus environments without level-shifting. |
| Standby Current (ISB1) | 15 mA max under CMOS-level CS deassertion; enables ultra-low-power sleep states in battery-backed controllers. |
| I/O Interface | TTL-compatible bidirectional data bus (I/O0–I/O7); directly interfaces with 5 V microcontrollers, FPGAs, and ASICs. |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, transportation, and outdoor instrumentation deployments. |
| Package | 28-pin TSOP Type I (PZG28); 8.1 mm × 13.4 mm footprint with gull-wing leads for reflow-solderable PCB assembly. |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 8.1 mm × 13.4 mm body, 0.5 mm lead pitch, gull-wing surface-mount terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting 0–32767 row/column decode; all inputs TTL-compatible with VIH ≥ 2.2 V. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; high-impedance when CS or OE inactive; drives/receives 5 V TTL levels. |
| CS | Chip Select | Active-low enable controlling device activation; dual-threshold support (TTL/CMOS) for ISB/ISB1 power modes. |
| OE | Output Enable | Active-low control of output drivers only; allows read operations while CS remains asserted. |
| WE | Write Enable | Active-low write strobe; initiates write cycle overlap with CS; determines tWP (10 ns min) and tDW (7 ns min). |
| VCC | Power Supply | +5 V ±10% supply input; decoupling required per high-speed RAM layout guidelines. |
| GND | Ground Reference | Signal and power return; separate ground plane recommended to minimize noise coupling into I/O paths. |
Key Features
| Feature | Design Value |
|---|---|
| Industrial temperature qualification | Guaranteed 15 ns timing and full functionality from –40°C to +85°C-enables deployment in uncontrolled environmental enclosures. |
| Dual standby current modes | ISB1 = 15 mA (CMOS-level CS) reduces idle power by 62.5% vs ISB = 40 mA (TTL-level CS), extending battery life in backup memory applications. |
| Asynchronous static operation | No clock, no refresh, no wait states-simplifies interface logic and eliminates timing jitter from dynamic memory controllers. |
| TTL-compatible I/O with 8 mA sink | Direct connection to legacy 5 V microprocessors (e.g., 80Cxx, Z80, 68K) without external buffers or level shifters. |
| TSOP-28 footprint | Compact 8.1 mm × 13.4 mm package supports high-density PCB layouts in programmable logic controllers and motor drives. |
Applications
| Programmable Logic Controller (PLC) Data Buffer | Industrial HMI Local Memory |
|---|---|
Use Scenario: Stores runtime variables, I/O image tables, and ladder logic state in DIN-rail mounted PLCs operating in factory-floor environments. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state read/write access to microcontroller during scan-cycle execution. Use Value: 15 ns tAA ensures <1 µs variable update latency; industrial temp rating prevents data corruption during summer ambient spikes. | Use Scenario: Holds display frame buffers, touch calibration data, and configuration settings in panel-mounted HMIs exposed to wide thermal swings. IC Role / Device Role / Timing Role: Non-refresh local memory mapped to ARM9 or Cortex-M4 AHB bus for fast GUI rendering and persistent parameter storage. Use Value: ISB1 = 15 mA enables >10-year battery-backed retention in maintenance-free installations. |
| Automated Test Equipment (ATE) Pattern Memory | Railway Signaling Control Module |
Use Scenario: Stores digital stimulus/response vectors in high-speed boundary-scan testers where deterministic access timing is critical for pass/fail decisions. IC Role / Device Role / Timing Role: Byte-wide pattern store accessed synchronously with test clock via simple address counter and CS/OE gating. Use Value: Equal tAA = tRC = 15 ns eliminates setup/hold violations across full address range, ensuring bit-perfect vector replay. | Use Scenario: Maintains fail-safe interlocking logic state and sensor history logs in EN 5012x-certified signaling cabinets installed along rail corridors. IC Role / Device Role / Timing Role: Safety-critical volatile memory holding real-time track occupancy status with hardware-enforced write protection via WE timing. Use Value: Guaranteed operation at –40°C ensures cold-weather reliability; green (halogen-free) packaging meets railway RoHS compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZAXI | 45 ns access time; 3.3 V supply only; 32K × 8 organization; SOIC-28 package. | Requires voltage translation in 5 V systems; slower timing limits use in sub-µs response loops. | Select only if migrating to 3.3 V architecture and timing budget allows ≥45 ns latency. |
| AS6C4008-15ZIN | 15 ns access time; 5 V supply; 512K × 8 organization; TSOP-32 package. | Larger density and different pinout (32-pin vs 28-pin); not drop-in compatible due to extra address lines and VPP pin. | Consider for new designs needing >256K capacity-but requires PCB redesign and firmware address map update. |
Compared with CY62128EV30LL-45ZAXI and AS6C4008-15ZIN, the IDT71256SA15PZI8 uniquely delivers 15 ns industrial-grade performance in a pin-compatible 28-pin TSOP footprint with native 5 V operation-making it the only direct replacement for legacy 5 V SRAM-based control systems requiring no layout or voltage rail changes.
Availability
IDT71256SA15PZI8 is available at Aetrix Electronics and suitable for industrial automation, railway signaling, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for IDT71256SA15PZI8 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 trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.
The IDT71256SA15PZI8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for deterministic, no-refresh memory interfacing in mission-critical industrial control and instrumentation systems.
FAQ
What is the guaranteed access time for IDT71256SA15PZI8 across its full operating temperature range?
IDT71256SA15PZI8 guarantees a maximum address access time (tAA) of 15 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 71256SA15 speed grade column.
Does IDT71256SA15PZI8 require a refresh circuit or clock signal to retain data?
No, IDT71256SA15PZI8 is a fully static RAM using asynchronous CMOS circuitry. It retains data indefinitely as long as VCC is applied and CS is held high (deselected) or low (selected) - no clocks, timers, or external refresh logic are needed. This simplifies design in microcontroller-based systems lacking DRAM controllers.
What is the difference between ISB and ISB1 standby current specifications for IDT71256SA15PZI8?
IDT71256SA15PZI8 defines two standby modes: ISB (40 mA max) activates when CS exceeds VIH (TTL threshold), while ISB1 (15 mA max) activates when CS exceeds VHC (CMOS threshold, ~VCC–0.2 V). ISB1 enables deeper power savings but requires cleaner, rail-to-rail CS drive-critical for battery-backed applications.
Can IDT71256SA15PZI8 be used with a 3.3 V microcontroller interface?
IDT71256SA15PZI8 operates exclusively from a 5 V supply (4.5–5.5 V) and has TTL-compatible I/O thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V). While it can accept 3.3 V logic HIGH inputs safely, its outputs swing to 5 V levels. Direct connection to 3.3 V-only I/O ports requires level-shifting or series resistors to avoid damage or excessive current draw.
Is IDT71256SA15PZI8 compliant with modern environmental regulations such as RoHS and REACH?
Yes, IDT71256SA15PZI8 is a green (halogen-free) device compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The datasheet explicitly states "Green parts available" and confirms restricted hazardous substance compliance in the Ordering Information section.
IDT71256SA15PZI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm 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-TSOP
IDT71256SA15PZI8 FAQ
1.How can I place an order for IDT71256SA15PZI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA15PZI8 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 IDT71256SA15PZI8 reliable?
The price and inventory of IDT71256SA15PZI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA15PZI8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA15PZI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA15PZI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA15PZI8?
IDT71256SA15PZI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA15PZI8 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 IDT71256SA15PZI8?
For technical support, including IDT71256SA15PZI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA15PZI8 requirements.
6.How does Aetrix verify that IDT71256SA15PZI8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA15PZI8 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 IDT71256SA15PZI8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA15PZI8?
All IDT71256SA15PZI8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA15PZI8, 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 IDT71256SA15PZI8 part is unused and in its original packaging.
Return procedure for IDT71256SA15PZI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA15PZI8 Tags
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