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Renesas IDT71256SA20PZ
- Part No.:
- IDT71256SA20PZ
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA20PZ.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,340
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Product details
Overview
IDT71256SA20PZ from Renesas Electronics is a 32K × 8 (256 Kbit) high-speed CMOS static RAM with 20 ns access time, industrial temperature range (–40°C to +85°C), TSOP-28 package, TTL-compatible I/O, and single 5 V supply operation. It serves as main or cache memory in embedded controllers, industrial PLCs, and legacy instrumentation requiring deterministic asynchronous read/write timing.
For engineers reviewing the IDT71256SA20PZ datasheet, IDT71256SA20PZ pinout, IDT71256SA20PZ application, or IDT71256SA20PZ equivalent, key selection criteria include guaranteed tAA ≤ 20 ns at industrial temperature, CS/OE dual-enable control logic, low ISB1 standby current (15 mA), and compatibility with legacy 5 V bus architectures without level shifting.
Technical Context
The IDT71256SA20PZ implements fully static asynchronous circuitry-no clocks or refresh required-and uses high-reliability CMOS technology for stable operation across its full industrial temperature range. Its control logic supports independent chip select (CS) and output enable (OE) pins, enabling flexible memory mapping and partial address decoding.
Timing is defined by overlapping CS and WE assertions for write cycles, with OE-controlled output gating during reads. The device guarantees tCLZ ≤ 4 ns and tOHZ ≤ 10 ns under industrial conditions, ensuring tight bus turnaround in real-time systems with minimal wait-state overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (256 Kbit); supports byte-wide data bus interfacing without multiplexing |
| Access Time (tAA) | 20 ns max at VCC = 4.5–5.5 V, TA = –40°C to +85°C; enables 50 MHz burst-free CPU interface |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails without regulation |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V, CMOS-level CS deassertion; reduces power in sleep modes |
| I/O Compatibility | TTL-input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOH ≥ 2.4 V @ –4 mA, VOL ≤ 0.4 V @ 8 mA) |
| Operating Temperature | –40°C to +85°C industrial grade; qualified for use in uncontrolled industrial enclosures |
| Package | 28-pin TSOP Type I (PZG28), 300-mil width; surface-mount compatible with standard reflow profiles |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 300-mil body width, JEDEC MO-147 compliant, lead-free (Green) option available.
| 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 TTL-compatible data path; high-impedance when CS or OE inactive |
| CS | Chip Select | Active-low enable; device enters standby (ISB1) when high; controls power state |
| OE | Output Enable | Active-low read control; gates outputs independently of CS; enables shared bus arbitration |
| WE | Write Enable | Active-low write strobe; latches data on falling edge when CS is low |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin per high-speed RAM layout rules |
| GND | Ground | Signal and power return; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | No clock, no refresh, no dynamic timing constraints-simplifies system timing design |
| Dual-enable control (CS + OE) | Enables selective output gating without disabling chip; supports multi-drop bus sharing |
| Low-power standby (ISB1 = 15 mA) | Reduces system idle power vs. standard ISB (40 mA); critical for battery-backed or fanless systems |
| TTL-compatible I/O | Direct interface to 5 V microcontrollers, FPGAs, and ASICs without level translators |
| Industrial temperature qualification | Guaranteed 20 ns performance across –40°C to +85°C; eliminates derating calculations |
Applications
| Industrial PLC Memory Buffer | Legacy Test Equipment Data Cache |
|---|---|
|
Use Scenario: Storing real-time I/O scan data and ladder logic variables in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer between CPU and field I/O modules; provides zero-wait-state access for deterministic scan cycle execution. Use Value: 20 ns tAA ensures sub-1 µs variable read/write latency, meeting IEC 61131-3 cycle time requirements for safety-critical motion control. |
Use Scenario: Holding waveform samples and calibration coefficients in benchtop oscilloscopes and signal generators with aging 5 V bus architectures. IC Role / Device Role / Timing Role: High-reliability data cache for ADC/DAC co-processing; operates continuously across thermal cycling without refresh-induced glitches. Use Value: Industrial temp rating and 15 mA ISB1 allow uninterrupted operation in non-air-conditioned lab environments with ambient swings up to 85°C. |
| Avionics Maintenance Terminal RAM | Medical Imaging Control Board Memory |
|
Use Scenario: Supporting diagnostic firmware execution and configuration storage in portable aircraft maintenance laptops exposed to wide ambient temperature excursions. IC Role / Device Role / Timing Role: Non-refreshing program/data memory for ARM7/8-based diagnostics engines; interfaces directly to legacy 5 V peripheral buses. Use Value: TSOP-28 package enables compact layout; guaranteed 20 ns timing at –40°C validates cold-soak startup reliability per DO-160 Section 24. |
Use Scenario: Storing real-time image processing buffers and lookup tables in ultrasound and X-ray control boards where EMI resilience and long-term data integrity are critical. IC Role / Device Role / Timing Role: Deterministic-access scratchpad memory for FPGA-accelerated image pipelines; synchronized via CS/OE handshaking to avoid bus contention. Use Value: Low output leakage (|ILO| ≤ 5 µA) and high noise margin prevent bit corruption in high-noise medical RF environments. |
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-45ZSXI | 32K × 8, 45 ns access, 3.3 V only, SOIC-28 package | Requires voltage translation for 5 V systems; unsuitable for legacy 5 V bus designs | Select only if migrating to 3.3 V architecture and board redesign is acceptable |
| AS6C4008-20TIN | 512K × 8, 20 ns, 3.3 V core with 5 V tolerant I/O, TSOP-32 | Higher density but larger footprint and incompatible pin count; not drop-in | Consider for new designs needing >256 Kbit, but requires PCB revision and I/O voltage validation |
Compared with CY62128EV30LL-45ZSXI and AS6C4008-20TIN, the IDT71256SA20PZ uniquely delivers 20 ns 5 V operation in a pin-compatible TSOP-28 footprint-enabling direct replacement in existing industrial and avionics hardware without layout changes or voltage rail modifications.
Availability
IDT71256SA20PZ is available at Aetrix Electronics and suitable for industrial automation, legacy test equipment, and medical imaging systems requiring stable component supply and long-lifecycle support for 5 V memory interfaces.
Supply support for IDT71256SA20PZ 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.
IDT71256SA20PZ belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for industrial and avionics systems demanding deterministic 5 V asynchronous memory with extended temperature reliability.
FAQ
What is the maximum guaranteed access time for IDT71256SA20PZ across its full industrial temperature range?
The IDT71256SA20PZ guarantees tAA ≤ 20 ns at VCC = 4.5–5.5 V and TA = –40°C to +85°C, as specified in the AC Electrical Characteristics table. This value is production-tested and applies to all units shipped-no derating is required for operation at temperature extremes. The IDT71256SA20PZ maintains this timing without refresh or clocking overhead.
Does IDT71256SA20PZ support true bidirectional I/O without external transceivers?
Yes, the IDT71256SA20PZ features internally controlled bidirectional I/O lines (I/O0–I/O7) that automatically switch between input and output states based on CS, WE, and OE logic levels. No external direction-control signals or transceivers are needed-the IDT71256SA20PZ handles bus direction internally per the Truth Table in the datasheet.
Can IDT71256SA20PZ be used in systems powered by 5 V ±5% supplies?
Yes, the IDT71256SA20PZ is fully specified for VCC = 4.5 V to 5.5 V, covering the full 5 V ±5% tolerance band. All DC and AC parameters-including VIH, VOL, tAA, and ISB1-are guaranteed across this range at industrial temperature, making the IDT71256SA20PZ suitable for unregulated 5 V rails common in legacy industrial designs.
What is the difference between ISB and ISB1 standby current for IDT71256SA20PZ?
ISB (40 mA max) applies when CS is pulled to TTL-high (>2.2 V), while ISB1 (15 mA max) applies when CS is driven to CMOS-high (>VCC–0.2 V). The IDT71256SA20PZ achieves lower power in deep sleep only when the host controller can assert a clean CMOS-level high on CS-critical for battery-backed or energy-sensitive applications.
Is IDT71256SA20PZ RoHS-compliant and halogen-free?
Yes, IDT71256SA20PZ is a Green part per Renesas' ordering information, meaning it complies with RoHS Directive 2011/65/EU and is halogen-free (per IEC 61249-2-21). The "G" suffix in the package code (PZG28) explicitly denotes this compliance, and material declarations are available upon request from Renesas.
IDT71256SA20PZ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
IDT71256SA20PZ FAQ
1.How can I place an order for IDT71256SA20PZ through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA20PZ 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 IDT71256SA20PZ reliable?
The price and inventory of IDT71256SA20PZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA20PZ is usually 5 days.
3.What payment methods are accepted for IDT71256SA20PZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA20PZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA20PZ?
IDT71256SA20PZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA20PZ 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 IDT71256SA20PZ?
For technical support, including IDT71256SA20PZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA20PZ requirements.
6.How does Aetrix verify that IDT71256SA20PZ is sourced from the original manufacturer or authorized distributors?
All IDT71256SA20PZ 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 IDT71256SA20PZ meets industry standards.
7.What is the process for return or replacement of IDT71256SA20PZ?
All IDT71256SA20PZ units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA20PZ, 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 IDT71256SA20PZ part is unused and in its original packaging.
Return procedure for IDT71256SA20PZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA20PZ Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24C04C-SSHM-T
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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