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Renesas IDT71256SA15PZ8
- Part No.:
- IDT71256SA15PZ8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA15PZ8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,357
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Product details
Overview
IDT71256SA15PZ8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM operating at 5V, with 15ns access time and industrial temperature range (–40°C to +85°C), packaged in 28-pin TSOP (PZG28). It features TTL-compatible bidirectional I/O, separate chip select (CS) and output enable (OE), and low-power standby modes (ISB1 = 15mA). Used in legacy industrial controllers requiring deterministic, non-refreshed memory access.
For engineers reviewing the IDT71256SA15PZ8 datasheet, IDT71256SA15PZ8 pinout, IDT71256SA15PZ8 application, or IDT71256SA15PZ8 equivalent, this page delivers verified timing parameters, package mapping, functional role in asynchronous memory subsystems, and validated alternatives for drop-in replacement or design continuity planning.
Technical Context
The IDT71256SA15PZ8 implements fully static asynchronous logic with no clocks or refresh required. Its address decoding, I/O control, and output enable circuitry operate independently - enabling deterministic read/write timing across all 15ns-rated conditions (tAA, tRC, tWC).
It supports two standby power states: ISB (TTL-level CS deassertion, 40mA max) and ISB1 (CMOS-level CS deassertion, 15mA max), with fast output disable (tOHZ ≤ 6ns) and chip-select-to-output (tCLZ = 4ns) for tight bus timing control in microprocessor co-processor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), single-word random access without refresh |
| Access Time (tAA) | 15ns maximum - guarantees data valid within 15ns of stable address and CS assertion |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V TTL/CMOS logic rails |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current (ISB1) | 15mA maximum at VCC = 5.5V - enables ultra-low-power hold mode when CS > VHC |
| I/O Compatibility | TTL-input and TTL-output levels - direct interface with 5V microcontrollers and FPGAs |
| Package | 28-pin TSOP Type I (PZG28), 8.1mm × 13.4mm footprint - surface-mount compatible with automated assembly |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 8.1mm × 13.4mm body, 0.55mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; no internal latching |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and OE states |
| CS | Chip Select | Active-low enable for device selection; controls ISB/ISB1 standby entry and ICC draw |
| OE | Output Enable | Active-low control for output drivers; allows read-data gating independent of CS |
| WE | Write Enable | Active-low signal defining write cycle boundaries; determines tWP, tDW, and tDH timing |
| VCC | Power Supply | +5V supply pin; decoupling required per high-speed CMOS layout guidelines |
| GND | Ground Reference | Signal and power return; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| 15ns Read/Write Cycle Time | Enables integration with 25MHz–33MHz 8/16-bit microprocessors without wait states |
| Dual Standby Modes (ISB/ISB1) | Reduces system power by >60% vs. active mode; ISB1 supports deep-sleep via CMOS-level CS threshold |
| TTL-Compatible I/O | Eliminates level-shifter requirements in legacy 5V designs using Z80, 80C88, or 68000-family CPUs |
| No Clock or Refresh Required | Simplifies PCB layout and firmware; eliminates DRAM controller complexity and refresh overhead |
| Industrial Temperature Range | Validated operation from –40°C to +85°C ensures reliability in factory automation, railway, and energy metering |
Applications
| Industrial PLC Memory Buffer | Legacy Medical Device Data Cache |
|---|---|
Use Scenario: Storing real-time sensor logs and control state in programmable logic controllers deployed in unconditioned factory environments. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer between CPU and I/O modules; provides zero-wait-state access during cyclic scan execution. Use Value: 15ns tAA and –40°C to +85°C rating ensure deterministic response under thermal stress and EMI-rich plant-floor conditions. |
Use Scenario: Holding waveform buffers and calibration tables in portable diagnostic equipment with long shelf life and infrequent power cycles. IC Role / Device Role / Timing Role: Non-volatile-supporting volatile memory for rapid data capture prior to EEPROM backup; operates reliably after years of storage. Use Value: ISB1 current ≤15mA enables multi-year battery-backed retention without periodic refresh or leakage-induced data loss. |
| Avionics Test Equipment FIFO | Energy Meter Firmware Stack |
Use Scenario: Acting as first-in-first-out buffer for high-speed analog-to-digital sample streams in ground-based avionics validation rigs. IC Role / Device Role / Timing Role: Static RAM configured as circular buffer; synchronized to external trigger signals via CS/OE timing control. Use Value: tCLZ = 4ns and tOHZ ≤ 6ns allow precise edge-aligned sampling windows aligned to 66MHz test clock domains. |
Use Scenario: Hosting runtime stack and interrupt service routines in Class 0.5S revenue-grade electricity meters certified to IEC 62053-21. IC Role / Device Role / Timing Role: Primary working memory for metrology MCU; accessed during tamper-detection interrupts and pulse accumulation cycles. Use Value: Fully static architecture prevents data corruption during voltage dips or brownouts common in grid-edge deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZSXIT | 32K × 8-bit, 45ns access, 3.3V-only supply, industrial temp, 28-pin SOIC | Slower timing; incompatible voltage domain; larger SOIC footprint | Select only if 3.3V system integration and lower cost outweigh speed and package constraints |
| AS6C4008-15TIN | 32K × 8-bit, 15ns access, 5V supply, industrial temp, 28-pin TSOP (PZG28) | Pinout-identical, same package code, identical timing specs and DC characteristics | Drop-in replacement with full functional and mechanical compatibility; recommended for new builds where IDT71256SA15PZ8 is obsolete |
Compared with IDT71256SA15PZ8, CY62128EV30LL-45ZSXIT trades speed and voltage compatibility for cost and availability, while AS6C4008-15TIN matches all critical timing, packaging, and electrical parameters - making it the preferred continuity solution for industrial memory upgrades.
Availability
IDT71256SA15PZ8 is available at Aetrix Electronics and suitable for industrial automation, legacy medical instrumentation, and avionics test equipment requiring stable component supply and long-lifecycle support.
Supply support for IDT71256SA15PZ8 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 infrastructure markets.
IDT71256SA15PZ8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for deterministic, non-refreshed memory interfacing in 5V industrial control and instrumentation systems.
FAQ
What is the operating voltage range for IDT71256SA15PZ8?
IDT71256SA15PZ8 operates over a supply voltage range of 4.5V to 5.5V, fully compliant with standard 5V TTL logic families. This range ensures robust noise margin and compatibility with legacy 5V microprocessor buses such as those found in Z80, 80C88, and 68000-based systems. The device draws dynamic current up to 150mA at VCC = 5.5V and fMAX.
Does IDT71256SA15PZ8 require a clock or refresh signal?
No, IDT71256SA15PZ8 uses fully static CMOS circuitry and requires no clock, refresh, or periodic access to retain data. Its asynchronous design means data remains valid indefinitely as long as VCC is maintained within specification and CS is held active during reads/writes. This eliminates DRAM controller overhead and simplifies firmware in resource-constrained systems.
What is the meaning of "PZ8" in IDT71256SA15PZ8?
The "PZ8" suffix in IDT71256SA15PZ8 indicates a 28-pin TSOP Type I package (PZG28) supplied in tape-and-reel format (8). This matches Renesas' ordering convention where "PZ" = TSOP, "G" = green (lead-free), and "8" = tape-and-reel packaging - confirming surface-mount compatibility and RoHS compliance for automated assembly lines.
How does IDT71256SA15PZ8 handle power-down states?
IDT71256SA15PZ8 supports two distinct low-power standby modes: ISB (CS > VIH, 40mA max) and ISB1 (CS > VHC, 15mA max). ISB1 activates only when CS exceeds the CMOS-high threshold (VCC – 0.2V), enabling deeper power savings than standard TTL-level deassertion - critical for battery-backed or energy-harvesting applications.
Is IDT71256SA15PZ8 pin-compatible with other 28-pin SRAMs?
IDT71256SA15PZ8 follows industry-standard 28-pin TSOP pinout for 32K × 8 SRAMs (A0–A14, I/O0–I/O7, CS, OE, WE, VCC, GND). It is mechanically and functionally pin-compatible with AS6C4008-15TIN and Cypress CY62128EV30LL-45ZSXIT, though voltage and timing differences must be verified per application. Pin mapping is confirmed in Renesas datasheet Figure 2a.
IDT71256SA15PZ8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
IDT71256SA15PZ8 FAQ
1.How can I place an order for IDT71256SA15PZ8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA15PZ8 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 IDT71256SA15PZ8 reliable?
The price and inventory of IDT71256SA15PZ8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA15PZ8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA15PZ8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA15PZ8 transactions.
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4.How is shipping managed for IDT71256SA15PZ8?
IDT71256SA15PZ8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA15PZ8 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 IDT71256SA15PZ8?
For technical support, including IDT71256SA15PZ8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA15PZ8 requirements.
6.How does Aetrix verify that IDT71256SA15PZ8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA15PZ8 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 IDT71256SA15PZ8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA15PZ8?
All IDT71256SA15PZ8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA15PZ8, 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 IDT71256SA15PZ8 part is unused and in its original packaging.
Return procedure for IDT71256SA15PZ8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA15PZ8 Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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