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Renesas IDT71256SA15PZI
- Part No.:
- IDT71256SA15PZI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA15PZI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,325
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Product details
Overview
IDT71256SA15PZI from Renesas Electronics is a 32K × 8 (256 Kbit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 15 ns access time, TTL-compatible I/O, and single 5 V supply operation. It serves as main or buffer memory in embedded controllers, data acquisition systems, and legacy industrial PLCs requiring deterministic asynchronous read/write timing.
For engineers reviewing the IDT71256SA15PZI datasheet, IDT71256SA15PZI pinout, IDT71256SA15PZI application, or IDT71256SA15PZI equivalent, key selection criteria include guaranteed tAA ≤ 15 ns at –40°C to +85°C, ISB1 standby current of 15 mA max, TSOP-28 package footprint compatibility, and OE-controlled output enable timing for bus arbitration.
Technical Context
The IDT71256SA15PZI implements fully static asynchronous architecture-no clocks or refresh required-with independent chip select (CS) and output enable (OE) control enabling flexible memory mapping and multi-device bus sharing. Its bidirectional I/O pins support direct TTL-level interfacing without level-shifting.
Timing is defined by overlapping CS and WE transitions for write cycles, while read cycles rely on CS and OE coordination to manage output impedance states (Low-Z during valid data, High-Z otherwise). All AC parameters-including tCLZ = 4 ns and tOHZ = 6 ns-are specified across the full industrial temperature range and validated under VCC = 5.0 V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data transfers |
| Access Time (tAA) | 15 ns max at –40°C to +85°C; ensures deterministic read latency in real-time control loops |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic rails and legacy industrial power domains |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V; enables low-power hold mode when CS driven above VHC |
| 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) |
| Package | 28-pin TSOP Type I (PZG28); 400 mil body width, 0.050" lead pitch, surface-mount compatible |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, transportation, and harsh-environment deployments |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 400 mil body width, JEDEC MO-153 compliant, lead-free and RoHS-compliant (Green part).
| 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 parallel interface; drives or latches data based on CS/WE/OE state |
| CS | Chip Select | Active-low enable; places device in active or standby (ISB/ISB1) mode |
| WE | Write Enable | Active-low control; initiates write cycle when CS = L and WE = L |
| OE | Output Enable | Active-low control; enables outputs during read (CS = L, OE = L) or forces High-Z (OE = H) |
| VCC | Power Supply | +5 V supply pin; must be decoupled locally per high-speed RAM layout guidelines |
| GND | Ground | Reference return path for all signals and power; requires low-inductance connection |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh-simplifies timing-critical designs like motor control firmware buffers |
| Industrial Temperature Range | –40°C to +85°C qualification enables deployment in uncontrolled cabinet environments |
| Low Standby Power (ISB1) | 15 mA max at VCC = 5.5 V allows extended hold mode in battery-backed or energy-constrained systems |
| TTL-Compatible I/O | Direct interface to 5 V microcontrollers (e.g., 8051, PIC18F, legacy ARM7) without level shifters |
| TSOP-28 Packaging | Surface-mount footprint reduces PCB area vs. DIP/SOJ; supports automated assembly and reflow |
Applications
| Industrial PLC Data Buffer | Legacy Embedded Controller Memory |
|---|---|
Use Scenario: Storing real-time I/O scan data between CPU cycles in programmable logic controllers operating in factory-floor cabinets. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer holding 32 KB of process image data; accessed via 8-bit parallel bus with deterministic 15 ns read latency. Use Value: Enables deterministic scan-cycle execution without wait states, even at –40°C ambient where thermal derating affects DRAM reliability. | Use Scenario: Serving as main program/data memory in 8-bit/16-bit microcontroller-based instrumentation (e.g., digital panel meters, sensor transmitters). IC Role / Device Role / Timing Role: Non-refreshing code and variable storage for firmware executing from external memory space. Use Value: Eliminates DRAM controller complexity and refresh overhead, simplifying BOM and improving long-term field reliability. |
| Communications Protocol Stack Buffer | Test Equipment Pattern Memory |
Use Scenario: Holding protocol frame buffers (Modbus RTU, CANopen) in serial gateway devices deployed in railway signaling cabinets. IC Role / Device Role / Timing Role: Dual-port-like behavior enabled by OE/CS sequencing for concurrent host access and peripheral DMA reads. Use Value: Supports burst-mode packet assembly with sub-20 ns address-to-data timing, meeting strict inter-frame gap requirements. | Use Scenario: Storing stimulus/response patterns in automated test equipment (ATE) for semiconductor wafer probing. IC Role / Device Role / Timing Role: High-reliability pattern store accessed synchronously by FPGA sequencer using CS/OE strobes. Use Value: Guarantees 15 ns access repeatability across temperature extremes, critical for nanosecond-level timing margin validation. |
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 | 32K × 8, 45 ns access, 3.3 V only, SOIC-28 package | Requires voltage translation for 5 V systems; slower timing invalidates use in <20 ns-critical paths | Select only if migrating to 3.3 V architecture and timing budget permits ≥45 ns latency |
| AS6C4008-15ZIN | 512K × 8, 15 ns access, 5 V, TSOP-32 package | Higher density but incompatible pinout (32-pin vs. 28-pin); requires PCB redesign | Consider for capacity upgrade paths where board revision is feasible and 512 KB is needed |
Compared with CY62128EV30LL-45ZSXI and AS6C4008-15ZIN, the IDT71256SA15PZI uniquely delivers 15 ns performance at 5 V in a drop-in TSOP-28 footprint-preserving legacy timing margins and eliminating level-shifting or layout changes.
Availability
IDT71256SA15PZI is available at Aetrix Electronics and suitable for industrial automation, legacy embedded control, and test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for IDT71256SA15PZI 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 IDT71256SA15PZI belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for industrial and embedded systems needing reliable, pin-compatible 5 V memory with guaranteed timing across extended temperature ranges.
FAQ
What is the maximum operating temperature range for the IDT71256SA15PZI?
The IDT71256SA15PZI is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC parameters in the datasheet, including tAA ≤ 15 ns and ISB1 ≤ 15 mA. The "I" suffix in the part number explicitly denotes industrial grade qualification, verified per Renesas' extended temperature test protocols.
Does the IDT71256SA15PZI require a clock or refresh circuit?
No, the IDT71256SA15PZI uses fully static CMOS design and requires no clock signal or periodic refresh cycles. Its operation is purely asynchronous-address, CS, WE, and OE transitions directly control read/write behavior. This eliminates timing controller overhead and makes the IDT71256SA15PZI ideal for simple microcontroller interfaces and deterministic real-time systems.
What package type does the IDT71256SA15PZI use, and is it RoHS-compliant?
The IDT71256SA15PZI uses a 28-pin TSOP Type I (PZG28) package with 400 mil body width and 0.050" lead pitch. Per Renesas' ordering information and datasheet revision history, this variant is a Green part-lead-free and RoHS-compliant, with no restricted hazardous substances. The "G" in the package code confirms compliance.
Can the IDT71256SA15PZI operate from a 3.3 V supply?
No-the IDT71256SA15PZI is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive capability (VOH ≥ 2.4 V @ –4 mA) are optimized for 5 V TTL logic families. Attempting 3.3 V operation will violate DC operating conditions and result in undefined behavior or functional failure of the IDT71256SA15PZI.
How does the Output Enable (OE) pin function in the IDT71256SA15PZI?
In the IDT71256SA15PZI, OE is an active-low control that independently gates output drivers. When CS = L and OE = L, data appears on I/O0–I/O7 within tOE ≤ 7 ns. When OE = H (even if CS = L), outputs enter High-Z state-enabling shared bus operation without requiring external tri-state logic. This behavior is confirmed in the Truth Table and timing waveforms of the official Renesas datasheet for IDT71256SA15PZI.
IDT71256SA15PZI 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
IDT71256SA15PZI FAQ
1.How can I place an order for IDT71256SA15PZI through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA15PZI 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 IDT71256SA15PZI reliable?
The price and inventory of IDT71256SA15PZI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA15PZI is usually 5 days.
3.What payment methods are accepted for IDT71256SA15PZI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA15PZI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA15PZI?
IDT71256SA15PZI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA15PZI 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 IDT71256SA15PZI?
For technical support, including IDT71256SA15PZI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA15PZI requirements.
6.How does Aetrix verify that IDT71256SA15PZI is sourced from the original manufacturer or authorized distributors?
All IDT71256SA15PZI 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 IDT71256SA15PZI meets industry standards.
7.What is the process for return or replacement of IDT71256SA15PZI?
All IDT71256SA15PZI units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA15PZI, 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 IDT71256SA15PZI part is unused and in its original packaging.
Return procedure for IDT71256SA15PZI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA15PZI Tags
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M24C02-WMN6TP
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