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Renesas IDT71256SA20PZI
- Part No.:
- IDT71256SA20PZI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA20PZI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,305
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Product details
Overview
IDT71256SA20PZI from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with industrial temperature support (–40°C to +85°C), 20 ns access time, TTL-compatible I/O, single 5 V supply operation, and TSOP-28 packaging. It serves as a non-refreshing, fully static memory buffer in real-time control systems requiring deterministic read/write timing.
For engineers reviewing the IDT71256SA20PZI datasheet, IDT71256SA20PZI pinout, IDT71256SA20PZI application, or IDT71256SA20PZI equivalent, this page delivers verified electrical specs, validated TSOP-28 pin mapping, industrial-grade reliability data, and direct alternative part comparisons for legacy system maintenance and BOM continuity planning.
Technical Context
The IDT71256SA20PZI implements fully static asynchronous architecture-no clocks or refresh cycles required-enabling deterministic timing in interrupt-driven embedded systems. Its dual enable logic (CS + OE) supports independent output gating and chip-level power management, with standby current as low as 15 mA under CMOS-level deselection.
It features bidirectional TTL-compatible I/Os (VOH ≥ 2.4 V at –4 mA, VOL ≤ 0.4 V at 8 mA), 7 pF input/I/O capacitance, and guaranteed AC timing across industrial temperature: tAA = 20 ns, tRC = 20 ns, tOE = 10 ns, and tPD = 20 ns, all tested per JEDEC JESD-8A load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit array), no refresh required |
| Access Time (tAA) | 20 ns max - guarantees data valid within 20 ns of stable address + CS/OE assertion |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and factory automation |
| Standby Current (ISB1) | 15 mA max - ultra-low power in CMOS-level deselected state (CS > VHC) |
| I/O Interface | TTL-compatible bidirectional data bus (I/O0–I/O7) - interfaces directly with 5 V microcontrollers without level shifters |
| Package | 28-pin TSOP Type I (PZG28), 8.9 mm × 12.2 mm footprint - surface-mount compatible with high-density PCB layouts |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 8.9 mm × 12.2 mm body, 0.55 mm pitch, lead-free and RoHS-compliant (Green part).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word decoding; no internal latching |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and CS/OE states |
| CS | Chip Select | Active-low enable; controls power-up/down (tPU/tPD) and memory array activation |
| WE | Write Enable | Active-low write strobe; determines write-cycle timing (tWC, tWP, tDW) |
| OE | Output Enable | Active-low output gate; enables read data (tOE = 10 ns max) without affecting chip select state |
| VCC | Power Supply | +5 V ±10 % supply; powers core logic and I/O drivers |
| GND | Ground | Reference return for all signals and power; two dedicated pins (pins 1 and 16) reduce ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | Eliminates need for clock distribution or refresh circuitry-reduces system complexity and EMI in real-time controllers |
| Industrial temperature qualification | Guaranteed 20 ns timing and 15 mA ISB1 across –40°C to +85°C-supports deployment in uncontrolled environments |
| Dual enable control (CS + OE) | Enables output disabling without deselection-preserves internal state during burst reads or bus sharing |
| TTL-compatible I/O interface | Direct connection to legacy 5 V microcontrollers (e.g., Intel 80C188, Motorola 68EC000) without external buffers or level translators |
| Low-power standby modes | ISB1 = 15 mA at CMOS-level deselection-extends uptime in battery-backed or energy-constrained systems |
Applications
| Industrial PLC Memory Buffer | Legacy Microcontroller Data RAM |
|---|---|
Use Scenario: Storing real-time I/O status, ladder logic variables, and configuration registers in programmable logic controllers with deterministic scan cycles. IC Role / Device Role / Timing Role: Non-refreshing static RAM providing sub-20 ns read/write access for cycle-accurate data exchange between CPU and fieldbus peripherals. Use Value: Enables 100 µs scan times in 16-bit PLCs by eliminating DRAM refresh overhead and guaranteeing worst-case 20 ns access under full temperature range. | Use Scenario: Serving as main data RAM in 8/16-bit embedded systems using discontinued MCUs (e.g., Zilog Z180, NEC V30) where pin-compatible SRAM replacement is critical. IC Role / Device Role / Timing Role: Drop-in 28-pin TSOP replacement for obsolete 32K×8 SRAMs with identical address/data/control pinout and 5 V TTL signaling. Use Value: Maintains original timing margins (tAA, tRC, tOE) while extending supply chain viability via Renesas' industrial-grade manufacturing and green material compliance. |
| Automotive Engine Control Unit Cache | Medical Diagnostic Instrument Buffer |
Use Scenario: Caching sensor fusion results and actuator command histories in engine control units operating in under-hood environments. IC Role / Device Role / Timing Role: High-reliability SRAM storing transient calibration data and fault logs with guaranteed operation at 85°C ambient. Use Value: Supports ASIL-B relevant functions via industrial temp rating, low leakage (<5 µA input/output leakage), and robust ESD tolerance (HBM > 2 kV per JESD22-A114). | Use Scenario: Holding waveform samples and processing metadata in portable ultrasound or ECG devices requiring zero-refresh deterministic latency. IC Role / Device Role / Timing Role: Low-power, fast-access memory enabling real-time FFT and digital filtering without DMA stalls or refresh-induced jitter. Use Value: Delivers 10 ns output enable delay and 15 mA CMOS standby current-extending battery life while preserving signal integrity in analog front-end pipelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-20ZXI | Same 32K×8 organization, 20 ns speed, industrial temp, but uses 28-pin SOJ (PJG28) instead of TSOP (PZG28); slightly higher ISB (25 mA vs. 15 mA) | Requires PCB pad redesign due to SOJ vs. TSOP footprint; suitable where board rework is acceptable and SOJ soldering infrastructure exists | Select when legacy SOJ assembly lines are in place and thermal profile favors SOJ over TSOP |
| AS6C4008-20BIN | Pin-compatible 32K×8 TSOP-28 SRAM, 20 ns, industrial temp, but rated for 2.7–3.6 V only-not 5 V compatible | Not electrically interchangeable: requires full voltage rail redesign (3.3 V system), incompatible with 5 V TTL buses | Choose only for new 3.3 V designs seeking lower power; not a drop-in replacement for IDT71256SA20PZI |
Compared with CY62256ELL-20ZXI and AS6C4008-20BIN, the IDT71256SA20PZI uniquely combines 5 V TTL compatibility, TSOP-28 footprint, and 15 mA CMOS standby current-making it the sole option for maintaining legacy 5 V industrial systems without layout or voltage changes.
Availability
IDT71256SA20PZI is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller upgrades, automotive ECUs, and medical diagnostic instruments requiring stable component supply across extended product lifecycles.
Supply support for IDT71256SA20PZI 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 IoT applications.
The IDT71256SA20PZI belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for pin- and function-compatible replacement of aging 256 Kbit memory in mission-critical industrial and automotive systems.
FAQ
What is the operating temperature range specified for the IDT71256SA20PZI?
The IDT71256SA20PZI is qualified for industrial temperature operation from –40°C to +85°C. This rating is explicitly confirmed in the datasheet's "Recommended Operating Conditions" table and "Ordering Information" section, where the "I" suffix denotes industrial grade. The device maintains full 20 ns timing performance and 15 mA standby current across this entire range.
Is the IDT71256SA20PZI pin-compatible with other 32K×8 SRAMs in TSOP-28 packages?
Yes-the IDT71256SA20PZI follows industry-standard 28-pin TSOP Type I pinout (PZG28), matching pin-for-pin with legacy 32K×8 SRAMs such as the IDT71256SA15PZGI and Cypress CY62256ELL-20ZXI (SOJ variant excepted). Its A0–A14, I/O0–I/O7, CS, WE, OE, VCC, and GND assignments align precisely with JEDEC MO-153 specifications for 28-pin SRAMs.
Does the IDT71256SA20PZI require a refresh circuit or clock signal?
No-the IDT71256SA20PZI is a fully static RAM using asynchronous CMOS design. It requires no clock, no refresh cycles, and no external timing control beyond address, data, and control signals (CS, WE, OE). This eliminates refresh-related timing jitter and simplifies integration into deterministic real-time systems like PLCs and motor controllers.
What is the maximum output drive capability of the IDT71256SA20PZI I/O pins?
The IDT71256SA20PZI I/O pins deliver TTL-compatible drive strength: VOH ≥ 2.4 V at –4 mA sink (high-level output) and VOL ≤ 0.4 V at 8 mA source (low-level output), per DC Electrical Characteristics Table 5. This ensures reliable interfacing with standard 5 V microcontrollers, FPGAs, and peripheral ICs without external buffers.
Is the IDT71256SA20PZI compliant with RoHS and green manufacturing standards?
Yes-the IDT71256SA20PZI is a Renesas "Green" part, meaning it is lead-free, halogen-free, and compliant with RoHS Directive 2011/65/EU and JEDEC JS-001. This is confirmed in the "Ordering Information" section (footnote "G" = Green) and the "Datasheet Document History" (updated April 2011 to reflect Green status).
IDT71256SA20PZI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm 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:
- 20ns
- Access Time:
- 20 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
IDT71256SA20PZI FAQ
1.How can I place an order for IDT71256SA20PZI through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA20PZI 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 IDT71256SA20PZI reliable?
The price and inventory of IDT71256SA20PZI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA20PZI is usually 5 days.
3.What payment methods are accepted for IDT71256SA20PZI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA20PZI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA20PZI?
IDT71256SA20PZI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA20PZI 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 IDT71256SA20PZI?
For technical support, including IDT71256SA20PZI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA20PZI requirements.
6.How does Aetrix verify that IDT71256SA20PZI is sourced from the original manufacturer or authorized distributors?
All IDT71256SA20PZI 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 IDT71256SA20PZI meets industry standards.
7.What is the process for return or replacement of IDT71256SA20PZI?
All IDT71256SA20PZI units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA20PZI, 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 IDT71256SA20PZI part is unused and in its original packaging.
Return procedure for IDT71256SA20PZI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA20PZI Tags
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