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Renesas IDT71256SA25PZI8
- Part No.:
- IDT71256SA25PZI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA25PZI8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,674
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Product details
Overview
IDT71256SA25PZI8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 25 ns access time, TTL-compatible I/O, and single 5 V supply operation. It features separate Chip Select (CS) and Output Enable (OE) pins, fully static asynchronous design (no clock or refresh required), and low-power standby modes (ISB1 = 15 mA). Used in legacy industrial controllers and embedded systems requiring deterministic, non-volatile-access memory.
For engineers reviewing the IDT71256SA25PZI8 datasheet, IDT71256SA25PZI8 pinout, IDT71256SA25PZI8 application, or IDT71256SA25PZI8 equivalent, key selection considerations include industrial-grade timing consistency (tAA = 25 ns max), TSOP-28 package compatibility, bidirectional TTL-level data bus interface, and dual standby current modes (ISB vs ISB1) for power-state optimization.
Technical Context
The IDT71256SA25PZI8 implements a fully static memory array with asynchronous read/write control logic, using no internal clocks or refresh circuitry. Its address decoder supports 15-bit addressing (A0–A14), and I/O control enables high-impedance tri-state outputs during deselect or OE-high conditions.
It operates under two distinct standby modes: ISB (TTL-level CS deassertion, 40 mA max) and ISB1 (CMOS-level CS deassertion with input voltage thresholds VLC/VHC, 15 mA max), enabling precise power management in mixed-signal environments where input logic levels are tightly controlled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data transfers without multiplexing. |
| Access Time (tAA) | 25 ns max at VCC = 4.5–5.5 V; guarantees deterministic read latency for real-time control loops. |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails without level-shifting. |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, motor drives, and outdoor instrumentation. |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V; enables ultra-low-power hold state when CS driven above VHC threshold. |
| I/O Compatibility | TTL-compatible inputs and outputs; interfaces directly with 74LS/74F logic and microcontroller data buses. |
| Package | 28-pin TSOP Type I (PZG28); surface-mount footprint optimized for high-density PCB layouts. |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 8.1 mm × 13.4 mm body, 0.55 mm pitch, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit unidirectional address bus; selects one of 32,768 memory locations. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; transitions to high-Z when CS or OE inactive. |
| CS | Chip Select | Active-low enable; controls device selection and power mode (ISB/ISB1). |
| OE | Output Enable | Active-low; enables output drivers independently of CS for read gating. |
| WE | Write Enable | Active-low; initiates write cycle when CS = L; disables outputs during write (tWHZ ≤ 11 ns). |
| VCC | Power Supply | +5 V supply pin; must be decoupled locally to suppress switching noise on data/address lines. |
| GND | Ground Reference | Signal and power ground; requires low-impedance connection to minimize read/write timing skew. |
Key Features
| Feature | Design Value |
|---|---|
| Fully static operation | No clocks or refresh cycles required-simplifies system timing design and eliminates hidden refresh overhead. |
| Dual standby current modes | ISB1 = 15 mA (CMOS-level CS) enables deeper sleep than ISB = 40 mA (TTL-level CS), improving power budgeting. |
| Separate OE and CS pins | Allows independent control of output drivers and chip activation-enables memory-mapped I/O sharing and burst-read optimization. |
| TTL-compatible I/O | Direct interface with legacy 5 V microcontrollers (e.g., Intel 80Cxx, Motorola 68K) without level translators. |
| Industrial temperature grade | Validated operation from –40°C to +85°C-suitable for DIN-rail PLCs, factory-floor HMIs, and transportation electronics. |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Memory Expansion |
|---|---|
Use Scenario: Storing I/O scan data and ladder logic variables in a DIN-rail mounted programmable logic controller operating in factory environments. IC Role / Device Role / Timing Role: Non-refreshing, byte-accessible SRAM providing deterministic 25 ns read/write cycles for cyclic process data exchange. Use Value: Eliminates DRAM refresh overhead and ensures consistent timing across temperature extremes, critical for hard real-time I/O scanning. | Use Scenario: Expanding external memory for an 8-bit or 16-bit microcontroller (e.g., 8051 or 68000) in a medical diagnostic instrument with fixed firmware. IC Role / Device Role / Timing Role: Parallel-addressed static RAM mapped into the processor's external memory space via dedicated address/data bus. Use Value: TTL-compatible signaling and 5 V operation allow direct connection without interface logic, reducing BOM count and layout complexity. |
| Automotive Engine Control Unit (ECU) Calibration Storage | Test Equipment Pattern Memory |
Use Scenario: Holding calibration tables and sensor compensation coefficients in an engine control unit deployed in under-hood applications. IC Role / Device Role / Timing Role: Industrial-grade SRAM retaining valid data across thermal cycling (–40°C to +85°C) without data retention loss. Use Value: Guaranteed operation over full automotive under-hood temperature range avoids need for external temperature compensation or redundant storage. | Use Scenario: Storing digital stimulus/response patterns in automated test equipment used for functional validation of ASICs. IC Role / Device Role / Timing Role: High-reliability, fast-access memory buffer enabling repeatable pattern generation at up to 40 MHz effective throughput. Use Value: 25 ns tRC and tWC support stable pattern sequencing without pipeline stalls, ensuring test repeatability across production batches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-45ZXI | 45 ns access time; 32K × 8 organization; same TSOP-28 package; 5 V only; ISB = 1 µA (lower standby) | Slower timing limits use in high-speed control loops; lower ISB benefits battery-backed systems | Select when ultra-low standby power outweighs speed requirements and timing margin allows ≥45 ns latency. |
| AS6C4008-25ZIN | 25 ns access time; 512K × 8 organization; TSOP-32 package; 2.7–3.6 V supply only | Higher density but incompatible voltage domain and pinout; requires level-shifting and PCB redesign | Select only for new designs targeting 3.3 V systems with higher memory capacity needs-requires full hardware requalification. |
Compared with CY62256ELL-45ZXI and AS6C4008-25ZIN, the IDT71256SA25PZI8 uniquely balances industrial temperature rating, 25 ns performance, 5 V compatibility, and TSOP-28 footprint-making it the only drop-in option for legacy 5 V industrial controllers needing guaranteed timing and thermal reliability.
Availability
IDT71256SA25PZI8 is available at Aetrix Electronics and suitable for industrial automation, legacy microcontroller expansion, and automotive ECU calibration storage requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for IDT71256SA25PZI8 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.
The IDT71256SA25PZI8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for industrial and automotive systems demanding deterministic timing, wide temperature operation, and pin-compatible upgrade paths from earlier IDT memory devices.
FAQ
What is the maximum operating temperature range for the IDT71256SA25PZI8?
The IDT71256SA25PZI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per Renesas' qualification standards and applies across all electrical parameters including access time (tAA ≤ 25 ns), standby current (ISB1 ≤ 15 mA), and I/O voltage thresholds. The device uses the "I" suffix in its ordering code (PZI8) to denote this industrial grade, distinguishing it from commercial-only variants like IDT71256SA25PZG8.
Does the IDT71256SA25PZI8 require a clock signal or refresh cycles?
No, the IDT71256SA25PZI8 is a fully static RAM and requires neither a clock signal nor periodic refresh cycles. Its internal circuitry uses static latches for data storage, enabling indefinite data retention as long as power is applied and CS remains active. This eliminates timing-critical refresh overhead, simplifying system design for real-time applications such as PLC scan engines and motor control firmware buffers.
What is the difference between ISB and ISB1 standby current in the IDT71256SA25PZI8?
ISB (standby current, TTL-level) is 40 mA max and activates when CS > VIH (≥2.2 V). ISB1 (standby current, CMOS-level) is 15 mA max and activates only when CS > VHC (VCC – 0.2 V, e.g., 4.8 V at VCC = 5.0 V) and all inputs are at valid CMOS logic levels. ISB1 enables deeper power savings in systems with clean, rail-to-rail control signals-critical for thermally constrained industrial enclosures.
Can the IDT71256SA25PZI8 be used with a 3.3 V microcontroller?
No-the IDT71256SA25PZI8 is specified only for 4.5 V to 5.5 V operation and features TTL-compatible I/O thresholds (VIH = 2.2 V min, VIL = 0.8 V max). Direct connection to a 3.3 V microcontroller risks violating input voltage limits and may cause unreliable reads/writes. A level-shifter IC or voltage translator is required for interoperability, adding latency and board area-making it unsuitable for cost- or space-sensitive 3.3 V designs.
What package type does the IDT71256SA25PZI8 use, and is it RoHS-compliant?
The IDT71256SA25PZI8 uses a 28-pin TSOP Type I (PZG28) package, measuring 8.1 mm × 13.4 mm with 0.55 mm lead pitch. Per Renesas' ordering information and datasheet revision history (updated Jun.29.20), this part is a "Green" device-meaning it complies with RoHS Directive 2011/65/EU and contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. The "G" suffix in PZI8 confirms green compliance.
IDT71256SA25PZI8 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:
- 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
IDT71256SA25PZI8 FAQ
1.How can I place an order for IDT71256SA25PZI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA25PZI8 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 IDT71256SA25PZI8 reliable?
The price and inventory of IDT71256SA25PZI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA25PZI8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA25PZI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA25PZI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA25PZI8?
IDT71256SA25PZI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA25PZI8 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 IDT71256SA25PZI8?
For technical support, including IDT71256SA25PZI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA25PZI8 requirements.
6.How does Aetrix verify that IDT71256SA25PZI8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA25PZI8 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 IDT71256SA25PZI8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA25PZI8?
All IDT71256SA25PZI8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA25PZI8, 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 IDT71256SA25PZI8 part is unused and in its original packaging.
Return procedure for IDT71256SA25PZI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA25PZI8 Tags
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M24C02-WMN6TP
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