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Renesas IDT71256SA25PZI
- Part No.:
- IDT71256SA25PZI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA25PZI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,550
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Product details
Overview
IDT71256SA25PZI from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with industrial temperature support (–40°C to +85°C), 25 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 embedded controllers, instrumentation front-ends, and legacy bus-based systems requiring deterministic read/write timing.
For engineers reviewing the IDT71256SA25PZI datasheet, IDT71256SA25PZI pinout, IDT71256SA25PZI application, or IDT71256SA25PZI equivalent, key selection criteria include industrial-grade reliability, 25 ns cycle time compliance, low standby current (ISB1 = 15 mA), and compatibility with 5 V TTL-level address/data/control buses in space-constrained PCB layouts using TSOP packaging.
Technical Context
The IDT71256SA25PZI 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) pins to manage read/write state transitions. Its bidirectional I/O architecture supports direct connection to 5 V TTL buses without level-shifting.
It features two standby modes: TTL-level standby (ISB = 40 mA at CS > VIH) and CMOS-level standby (ISB1 = 15 mA at CS > VHC), enabling power optimization based on system control voltage thresholds. All timing parameters-including tAA (25 ns), tRC (25 ns), and tOE (11 ns)-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 data transfers without multiplexing |
| Access Time (tAA) | 25 ns max; ensures deterministic read latency for real-time control loops |
| Cycle Time (tRC) | 25 ns max; defines minimum interval between successive read/write operations |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic rails and tolerant of ±10% regulation |
| Standby Current (ISB1) | 15 mA max at CMOS-level CS disable; enables low-power hold mode in battery-backed systems |
| I/O Compatibility | TTL-compatible inputs/outputs; eliminates need for external level translators in 5 V systems |
| Operating Temperature | –40°C to +85°C; qualified for industrial environments including factory automation and transportation electronics |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 8.1 mm × 13.4 mm body, 0.5 mm pitch, surface-mount, lead-free (Green) compliant.
| 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; high-impedance when CS or OE inactive |
| CS | Chip Select | Active-low enable controlling device selection and power state (ISB/ISB1) |
| OE | Output Enable | Active-low control for output drivers only; allows read data gating without deselecting chip |
| WE | Write Enable | Active-low signal defining write cycle boundaries; used with CS for write strobing |
| VCC, GND | Power Supply | Single 5 V supply with dedicated ground; decoupling required per high-speed RAM layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | No clock, no refresh, no wait states-simplifies timing-critical microcontroller or FPGA memory interfaces |
| Dual-enable control (CS + OE) | Enables selective output gating during reads while maintaining chip activation for burst access |
| CMOS-level standby (ISB1 = 15 mA) | Reduces power by ~63% vs. TTL-level standby, critical for thermally constrained industrial enclosures |
| Guaranteed 25 ns timing over –40°C to +85°C | Eliminates derating calculations for industrial thermal profiles; supports fixed-cycle firmware timing |
| TSOP-28 Green package | RoHS-compliant, surface-mountable footprint optimized for automated assembly and board density |
Applications
| Industrial PLC I/O Buffer | Medical Instrumentation Data Capture |
|---|---|
Use Scenario: Storing real-time sensor samples and control command queues in programmable logic controllers with deterministic scan cycles. IC Role / Device Role / Timing Role: Non-volatile-equivalent scratchpad memory holding input/output image tables during ladder logic execution. Use Value: 25 ns tAA guarantees sub-microsecond memory access within 100 µs PLC scan windows, avoiding pipeline stalls. | Use Scenario: Capturing analog-to-digital conversion results from multi-channel patient monitors before host processor transfer. IC Role / Device Role / Timing Role: High-reliability, zero-refresh FIFO buffer interfacing ADCs to ARM Cortex-M4 hosts via parallel bus. Use Value: Industrial temperature rating ensures stable operation inside sealed medical enclosures with ambient drift up to +85°C. |
| Legacy Avionics Display Controller | Test Equipment Pattern Generator |
Use Scenario: Holding frame buffers and character glyphs in DO-254-certifiable display subsystems using aging 5 V bus architectures. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for obsolete 28-pin SRAMs in MIL-STD-1553 or ARINC-429 interface modules. Use Value: TTL compatibility and 28-pin TSOP footprint enable direct substitution without PCB rework or signal integrity impact. | Use Scenario: Storing test vectors and expected response patterns in automated boundary-scan testers with fixed-cycle pattern engines. IC Role / Device Role / Timing Role: Deterministic-access memory providing glitch-free stimulus delivery synchronized to 40 MHz pattern clocks. Use Value: Guaranteed 25 ns tRC ensures consistent vector delivery timing across temperature extremes during burn-in testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256LL-25ZSXIT | Same 32K × 8 organization, 25 ns speed, but 32-pin SOIC package; higher ICC (160 mA vs. 145 mA) | Requires PCB layout change due to 32-pin SOIC vs. 28-pin TSOP; better suited for through-hole prototyping | Select if board redesign is acceptable and SOIC handling is preferred over TSOP reflow constraints |
| AS6C4008-25ZIN | 25 ns speed, industrial temp, but 32-pin SOP package; lower ISB1 (5 µA vs. 15 mA) | Ultra-low standby current ideal for battery-buffered systems; incompatible pinout prevents drop-in use | Choose when micropower standby dominates over footprint compatibility in portable diagnostic tools |
Compared with CY62256LL-25ZSXIT and AS6C4008-25ZIN, the IDT71256SA25PZI uniquely balances industrial temperature assurance, TSOP-28 space efficiency, and proven 5 V TTL interoperability-making it optimal for retrofitting legacy 5 V systems where board area and thermal margin are constrained.
Availability
IDT71256SA25PZI is available at Aetrix Electronics and suitable for industrial PLCs, medical instrumentation, legacy avionics displays, and automated test equipment requiring stable component supply under extended temperature operation.
Supply support for IDT71256SA25PZI 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 is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.
The IDT71256SA25PZI belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for 5 V parallel-bus systems needing deterministic, zero-refresh memory in harsh thermal environments.
FAQ
What is the operating voltage range for the IDT71256SA25PZI?
The IDT71256SA25PZI operates from 4.5 V to 5.5 V DC, fully compliant with standard 5 V TTL logic supply tolerances. This range ensures robust functionality across industrial power rails with ±10% regulation, and all AC/DC specifications-including 25 ns access time and 15 mA ISB1-are guaranteed across this voltage window and the full –40°C to +85°C temperature range.
Does the IDT71256SA25PZI require a clock or refresh signal?
No, the IDT71256SA25PZI uses fully static CMOS design and requires neither a clock nor periodic refresh. Its asynchronous operation means data retention is maintained indefinitely as long as VCC is applied and CS remains active or in CMOS-level standby (ISB1). This eliminates timing overhead in microcontroller or FPGA memory controllers and simplifies system-level design.
What is the meaning of "PZI" in the part number IDT71256SA25PZI?
In IDT71256SA25PZI, "PZ" denotes TSOP Type I package (PZG28), and "I" indicates Industrial temperature grade (–40°C to +85°C). The "25" specifies 25 ns access time, "SA" identifies the advanced high-speed CMOS SRAM family, and "IDT71256" is the base device type. Thus, IDT71256SA25PZI is the industrial-grade, 25 ns, TSOP-packaged variant of the 32K × 8 SRAM.
Can the IDT71256SA25PZI be used in place of faster 12 ns or 15 ns variants?
Yes, the IDT71256SA25PZI is functionally compatible with faster variants (e.g., IDT71256SA15PZGI) in pinout and interface, but its 25 ns timing limits maximum bus throughput. System timing margins must be recalculated-especially tRC and tAA-to ensure setup/hold compliance. It is commonly selected where cost, availability, or thermal/power trade-offs favor relaxed timing over peak speed.
Is the IDT71256SA25PZI RoHS-compliant and halogen-free?
Yes, the IDT71256SA25PZI is a Green-part designation per Renesas' ordering information, confirming compliance with RoHS Directive 2011/65/EU and halogen-free material requirements. The TSOP-28 (PZG28) package uses lead-free terminations and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) for standard SMT assembly processes.
IDT71256SA25PZI 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:
- 25ns
- Access Time:
- 25 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
IDT71256SA25PZI FAQ
1.How can I place an order for IDT71256SA25PZI through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA25PZI 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 IDT71256SA25PZI reliable?
The price and inventory of IDT71256SA25PZI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA25PZI is usually 5 days.
3.What payment methods are accepted for IDT71256SA25PZI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA25PZI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA25PZI?
IDT71256SA25PZI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA25PZI 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 IDT71256SA25PZI?
For technical support, including IDT71256SA25PZI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA25PZI requirements.
6.How does Aetrix verify that IDT71256SA25PZI is sourced from the original manufacturer or authorized distributors?
All IDT71256SA25PZI 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 IDT71256SA25PZI meets industry standards.
7.What is the process for return or replacement of IDT71256SA25PZI?
All IDT71256SA25PZI units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA25PZI, 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 IDT71256SA25PZI part is unused and in its original packaging.
Return procedure for IDT71256SA25PZI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA25PZI Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
Microchip Technology
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Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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Microchip Technology
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Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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