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Renesas IDT71256SA15PZ
- Part No.:
- IDT71256SA15PZ
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA15PZ.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,444
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Product details
Overview
IDT71256SA15PZ from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 15 ns access and cycle times, TTL-compatible I/O, single 5 V supply operation, and industrial-grade temperature support (–40°C to +85°C). It serves as a non-refreshing, fully static memory buffer in embedded controllers, legacy industrial PLCs, and instrumentation data acquisition systems requiring deterministic timing.
For engineers reviewing the IDT71256SA15PZ datasheet, IDT71256SA15PZ pinout, IDT71256SA15PZ application, or IDT71256SA15PZ equivalent, key selection criteria include verified 15 ns tAA/tRC timing under industrial conditions, TSOP-28 package compatibility with space-constrained PCB layouts, low ISB1 standby current (15 mA), and direct TTL-level interface without level-shifting.
Technical Context
The IDT71256SA15PZ implements fully static asynchronous architecture-no clocks or refresh cycles required-and uses dual-control enable logic with independent Chip Select (CS) and Output Enable (OE) inputs to manage read/write state transitions. Its bidirectional I/O bus supports true three-state output control via OE and CS, enabling clean bus sharing in multi-device systems.
It operates across 4.5 V to 5.5 V supply range with guaranteed VIH ≥ 2.2 V and VIL ≤ 0.8 V, ensuring robust noise margin in mixed-signal environments. Standby current drops to 15 mA (ISB1) when CS is held above VHC, making it suitable for intermittent-access applications like firmware scratchpad or configuration storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit array); supports byte-wide parallel data transfers without interleaving or banking logic |
| Access Time (tAA) | 15 ns max at VCC = 4.5–5.5 V, TA = –40°C to +85°C; enables 66.7 MHz burst read capability in synchronous glue logic |
| Cycle Time (tRC) | 15 ns max; defines minimum interval between successive read/write operations on same address |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails without regulation overhead |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V, f = 0; reduces power in idle states without sacrificing wake-up latency |
| I/O Compatibility | TTL-input and TTL-output levels; eliminates need for external level translators when interfacing with 74LS/ALS or microcontroller GPIO |
| Package | 28-pin TSOP Type I (PZG28); 8.1 mm × 13.4 mm footprint with 0.55 mm pitch, optimized for automated SMT assembly |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 8.1 mm × 13.4 mm body, 0.55 mm lead pitch, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting full 32K address space; no internal latching-address must be stable before CS/OE assertion |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; high-impedance when CS = high or OE = high during reads, tri-stated during writes when WE = low |
| CS | Chip Select | Active-low device enable; controls power-down (ISB1) when high and VCC ≥ 4.5 V; asserts internal standby mode |
| WE | Write Enable | Active-low write strobe; initiates write cycle only when CS = low; disables outputs during write (tWHZ = 6 ns max) |
| OE | Output Enable | Active-low output control; enables read data drive (tOE = 7 ns max) while CS = low; overrides WE during read |
| VCC | Power Supply | +5 V nominal supply input; decoupling capacitor required within 10 mm of pin per layout guidelines |
| GND | Ground Reference | Signal and power ground return; requires low-inductance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Zero-refresh static operation | Eliminates DRAM controller complexity and refresh overhead in microcontroller-based systems |
| Dual-enable read control (CS + OE) | Enables precise output gating-OE can disable outputs mid-cycle without deselecting chip, reducing bus contention |
| Low ISB1 standby current (15 mA) | Supports battery-backed or energy-sensitive applications where memory remains powered but inactive for extended periods |
| TTL-compatible I/O thresholds | Guarantees interoperability with legacy 5 V logic families without voltage translation circuitry |
| Industrial temperature range (–40°C to +85°C) | Validated for deployment in uncontrolled environments such as factory-floor HMIs, motor drives, and outdoor telemetry units |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Scratchpad |
|---|---|
Use Scenario: Real-time I/O scan buffers in programmable logic controllers where deterministic memory access is required between scan cycles. IC Role / Device Role / Timing Role: Static RAM providing zero-latency, non-refreshing storage for process image tables and intermediate calculation results. Use Value: 15 ns tAA ensures sub-microsecond data fetch within tight 100 µs scan windows, eliminating jitter from dynamic refresh arbitration. | Use Scenario: Temporary variable storage in 8-bit/16-bit MCUs lacking sufficient on-chip RAM for complex control algorithms. IC Role / Device Role / Timing Role: External scratchpad memory mapped into MCU address space via simple address decoding logic. Use Value: TTL-compatible I/O and 5 V operation allow direct connection to MCS-51, Z80, or HC11 buses without level shifters or glue logic. |
| Test Equipment Configuration Store | Avionics Maintenance Terminal Memory |
Use Scenario: Storing calibration coefficients, test sequences, and user preferences in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Nonvolatile-adjacent volatile storage holding runtime-configurable parameters accessed infrequently but with strict timing predictability. Use Value: ISB1 = 15 mA enables low-power retention during instrument standby, extending battery life in portable units. | Use Scenario: Supporting diagnostic software execution and temporary log storage in line-replaceable maintenance terminals aboard aircraft. IC Role / Device Role / Timing Role: High-reliability SRAM used in DO-254-compliant memory subsystems where radiation tolerance and thermal stability are critical. Use Value: Industrial-grade temperature rating (–40°C to +85°C) and tested AC timing across full range ensure operation in avionics bay thermal transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZSXI | 512K × 8-bit, 45 ns access, 3.3 V core (with 5 V tolerant I/O), TSOP-28 | Higher density but slower speed; requires 3.3 V supply rail and level-aware design | Select only if migrating to lower-voltage systems and additional memory capacity is needed |
| AS6C4008-15ZIN | 512K × 8-bit, 15 ns access, 5 V operation, TSOP-28, higher ICC (25 mA active) | Same speed and voltage, but larger capacity and higher active power draw | Prefer when board layout allows same footprint and >256 Kbit capacity is required |
Compared with IDT71256SA15PZ, CY62128EV30LL-45ZSXI trades speed for voltage scalability and density, while AS6C4008-15ZIN matches timing but increases capacity and active current-neither offers pin-to-pin compatibility, requiring address/data bus re-routing and timing validation.
Availability
IDT71256SA15PZ is available at Aetrix Electronics and suitable for industrial automation, legacy embedded control, and test equipment applications requiring stable component supply, long-lifecycle support, and verified industrial-temperature performance.
Supply support for IDT71256SA15PZ 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, infrastructure, and IoT applications.
IDT71256SA15PZ belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for drop-in replacement of aging 28-pin 5 V memory in cost-sensitive, reliability-critical industrial systems.
FAQ
What is the operating temperature range for IDT71256SA15PZ?
IDT71256SA15PZ is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the datasheet's Recommended Operating Conditions table and applies to all AC/DC electrical parameters including tAA = 15 ns, ISB1 = 15 mA, and VIH/VIL thresholds. The part is not qualified for commercial-only grades (0°C to +70°C) in this specific PZ package variant.
Does IDT71256SA15PZ require a clock or refresh signal?
No, IDT71256SA15PZ uses fully static CMOS memory cells and requires no clock, refresh cycles, or periodic access to retain data. Its asynchronous interface responds solely to CS, OE, and WE control signals. This eliminates timing-critical refresh overhead in microcontroller or FPGA-based systems, simplifying memory controller design for IDT71256SA15PZ integration.
What is the maximum output drive capability of IDT71256SA15PZ I/O pins?
IDT71256SA15PZ guarantees VOL ≤ 0.4 V at IOL = 8 mA and VOH ≥ 2.4 V at IOH = –4 mA under VCC = 4.5 V minimum. These values confirm direct drive capability into standard TTL loads (e.g., 74LS inputs) without external buffers. The datasheet specifies |ILO| ≤ 5 µA leakage, ensuring minimal bus loading during high-Z states.
Can IDT71256SA15PZ be used with a 3.3 V microcontroller interface?
IDT71256SA15PZ is a 5 V-only device with VIH minimum = 2.2 V and VIL maximum = 0.8 V. While its inputs accept 3.3 V logic HIGH, its outputs swing to 5 V levels and may damage 3.3 V-only receivers. Direct interface requires level translation or bus isolation. For native 3.3 V systems, consider alternatives like CY62128EV30LL-45ZSXI-not IDT71256SA15PZ.
What package type does IDT71256SA15PZ use, and is it RoHS compliant?
IDT71256SA15PZ uses a 28-pin TSOP Type I (PZG28) package, 8.1 mm × 13.4 mm body size, 0.55 mm lead pitch. Per Renesas' ordering information and datasheet revision history (June 2020), this variant is a "Green" part-lead-free, halogen-free, and RoHS compliant, with packaging marked "G" in the orderable part number suffix.
IDT71256SA15PZ 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:
- 15ns
- Access Time:
- 15 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
IDT71256SA15PZ FAQ
1.How can I place an order for IDT71256SA15PZ through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA15PZ 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 IDT71256SA15PZ reliable?
The price and inventory of IDT71256SA15PZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA15PZ is usually 5 days.
3.What payment methods are accepted for IDT71256SA15PZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA15PZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA15PZ?
IDT71256SA15PZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA15PZ 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 IDT71256SA15PZ?
For technical support, including IDT71256SA15PZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA15PZ requirements.
6.How does Aetrix verify that IDT71256SA15PZ is sourced from the original manufacturer or authorized distributors?
All IDT71256SA15PZ 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 IDT71256SA15PZ meets industry standards.
7.What is the process for return or replacement of IDT71256SA15PZ?
All IDT71256SA15PZ units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA15PZ, 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 IDT71256SA15PZ part is unused and in its original packaging.
Return procedure for IDT71256SA15PZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA15PZ Tags
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M24C02-WMN6TP
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