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Renesas IDT71256SA25PZ
- Part No.:
- IDT71256SA25PZ
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA25PZ.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,510
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Product details
Overview
IDT71256SA25PZ from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with 25 ns access time, industrial temperature range (–40°C to +85°C), TSOP-28 package, TTL-compatible I/O, and single 5 V supply operation. It serves as main or buffer memory in embedded controllers, industrial PLCs, and legacy instrumentation requiring deterministic asynchronous read/write timing.
For engineers reviewing the IDT71256SA25PZ datasheet, IDT71256SA25PZ pinout, IDT71256SA25PZ application, or IDT71256SA25PZ equivalent, key selection criteria include guaranteed 25 ns tAA/tRC timing under industrial conditions, low ISB1 standby current (15 mA), dual chip select/output enable control logic, and TSOP-28 footprint compatibility with legacy board layouts.
Technical Context
The IDT71256SA25PZ implements fully static asynchronous architecture-no clocks or refresh required-with independent address decoding, bidirectional TTL-compatible I/O drivers, and dual-level chip deselect (TTL- and CMOS-compatible CS thresholds). Its control logic supports both WE-controlled and CS-controlled write cycles, with tWHZ ≤ 11 ns ensuring clean bus release before data input.
Timing is characterized across industrial temperature and 4.5–5.5 V supply, with tCLZ = 4 ns and tOHZ = 10 ns enabling fast output enable transitions, while tPD = 25 ns guarantees full power-down after chip deselect-critical for low-power intermittent operation in battery-backed systems.
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, TA = –40°C to +85°C; ensures deterministic latency in 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 variation |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V, f = 0; enables ultra-low-power hold mode when CS > VHC |
| I/O Compatibility | TTL-input/outputs; interfaces directly with 74LS/74F logic and microcontroller GPIO without level shifters |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, transportation, and outdoor equipment environments |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 300-mil width, JEDEC MO-141 compliant, surface-mountable with 0.55 mm pitch.
| 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 data path; direction controlled by WE and OE states |
| CS | Chip Select | Active-low enable; device enters standby (high-Z I/O, low ISB) when high |
| OE | Output Enable | Active-low; enables output drivers only during read cycles; tOE ≤ 11 ns |
| WE | Write Enable | Active-low; initiates write cycle when CS and WE both low; tWP ≥ 20 ns minimum |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin per high-speed RAM layout rules |
| GND | Ground | Signal reference; separate ground plane recommended for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | No clock, no refresh, no wait states-simplifies timing-critical MCU interfacing |
| Dual standby modes (ISB/ISB1) | 15 mA ISB1 current when CS > VHC enables deeper power savings than TTL-level deselect |
| TTL-compatible I/O | Direct connection to legacy 5 V microcontrollers (e.g., 8051, Z80) and peripheral ICs without interface logic |
| Industrial temperature qualification | Guaranteed 25 ns timing across –40°C to +85°C-validates use in uncontrolled ambient environments |
| TSOP-28 footprint | Compact 18.4 mm × 8.2 mm surface-mount package; replaces DIP/SOJ in space-constrained designs |
Applications
| Industrial PLC Memory Buffer | Legacy Test Equipment Data Storage |
|---|---|
Use Scenario: Storing real-time sensor acquisition buffers and program instruction cache in programmable logic controllers deployed in factory-floor cabinets. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state memory access for deterministic scan-cycle execution. Use Value: 25 ns tAA ensures sub-microsecond response to I/O interrupt events, meeting IEC 61131-3 cycle-time requirements. | Use Scenario: Holding calibration tables and waveform capture buffers in benchtop oscilloscopes and signal generators built before 2010. IC Role / Device Role / Timing Role: Non-refreshed, pin-compatible drop-in replacement for obsolete 28-pin SRAMs in repair and obsolescence mitigation. Use Value: TSOP-28 package and identical pinout allow direct PCB reuse-no layout revision needed for field upgrades. |
| Avionics Data Logger | Medical Imaging Control Board |
Use Scenario: Capturing flight parameter snapshots (altitude, attitude, engine telemetry) during transient events in certified airborne systems. IC Role / Device Role / Timing Role: Radiation-tolerant (per design heritage), non-volatile-buffer SRAM holding critical pre-failure data before power loss. Use Value: Industrial-grade temperature margin and 15 mA ISB1 support extended battery-backed hold time during brownout conditions. | Use Scenario: Supporting real-time image processing pipelines in ultrasound and X-ray control boards where deterministic latency is mandatory. IC Role / Device Role / Timing Role: High-reliability, low-jitter memory for frame buffering between FPGA-based image processors and display controllers. Use Value: tOH = 3 ns and tCHZ ≤ 11 ns minimize bus contention windows, reducing risk of data corruption in multi-master configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-25ZXI | Same 32K × 8 organization, 25 ns speed, industrial temp, but uses SOIC-28 (not TSOP); higher ICC (160 mA vs. 145 mA) | Requires PCB pad redesign due to SOIC-28 footprint; unsuitable for space-constrained TSOP layouts | Select only if SOIC mounting is preferred and board rework is acceptable |
| AS6C4008-25ZIN | 25 ns access, industrial temp, TSOP-28, but 5 V ±10% tolerance tighter (4.75–5.25 V); lower ISB1 (5 µA vs. 15 mA) | Lower standby current benefits battery-powered devices; narrower VCC window requires tighter regulator control | Choose when ultra-low ISB1 is prioritized and supply regulation meets spec |
Compared with CY62256ELL-25ZXI and AS6C4008-25ZIN, the IDT71256SA25PZ offers optimal balance of TSOP-28 compatibility, 4.5–5.5 V supply flexibility, and proven industrial reliability-making it the preferred choice for legacy system sustainment and industrial control retrofit programs.
Availability
IDT71256SA25PZ is available at Aetrix Electronics and suitable for industrial PLCs, avionics data loggers, and medical imaging control boards requiring stable component supply across extended product lifecycles.
Supply support for IDT71256SA25PZ 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 IDT71256SA25PZ belongs to Renesas' legacy high-speed CMOS SRAM product line-designed specifically for deterministic, low-latency memory interfacing in industrial and aerospace systems where refresh-free operation and wide temperature margins are essential.
FAQ
What is the maximum operating temperature range for IDT71256SA25PZ?
IDT71256SA25PZ is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC parameters-including 25 ns access time, 15 mA ISB1 standby current, and TTL-compatible I/O thresholds-under full voltage (4.5–5.5 V) and thermal stress conditions.
Does IDT71256SA25PZ require a clock or refresh circuit?
No, IDT71256SA25PZ uses fully static CMOS architecture and requires neither a clock nor periodic refresh. Its internal memory array retains data indefinitely as long as VCC is applied and CS remains asserted low during active use-making it ideal for simple microcontroller interfaces without timing overhead.
What package type does IDT71256SA25PZ use, and is it RoHS-compliant?
IDT71256SA25PZ uses a 28-pin TSOP Type I (PZG28) package, 300-mil width, with 0.55 mm lead pitch. It is a green (lead-free, halogen-free) device compliant with RoHS Directive 2011/65/EU and REACH SVHC regulations, as confirmed in Renesas' ordering information and material declarations.
Can IDT71256SA25PZ be used with a 3.3 V microcontroller?
IDT71256SA25PZ is specified for 5 V operation only (4.5–5.5 V). Its TTL-compatible inputs accept 3.3 V logic HIGH as valid (VIH min = 2.2 V), but outputs swing to ~3.5 V (VOH min = 2.4 V at IOH = –4 mA), which may not meet 3.3 V receiver thresholds reliably. A level-shifter is recommended for robust 3.3 V system integration.
What is the difference between ISB and ISB1 standby current in IDT71256SA25PZ?
IDT71256SA25PZ defines two standby modes: ISB (50 mA max) activates when CS > VIH (TTL threshold), while ISB1 (15 mA max) engages when CS > VHC (CMOS threshold, ≈ VCC – 0.2 V). ISB1 delivers deeper power savings and is enabled by driving CS to near-VCC-critical for battery-hold applications where every milliamp matters.
IDT71256SA25PZ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
IDT71256SA25PZ FAQ
1.How can I place an order for IDT71256SA25PZ through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA25PZ 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 IDT71256SA25PZ reliable?
The price and inventory of IDT71256SA25PZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA25PZ is usually 5 days.
3.What payment methods are accepted for IDT71256SA25PZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA25PZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA25PZ?
IDT71256SA25PZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA25PZ 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 IDT71256SA25PZ?
For technical support, including IDT71256SA25PZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA25PZ requirements.
6.How does Aetrix verify that IDT71256SA25PZ is sourced from the original manufacturer or authorized distributors?
All IDT71256SA25PZ 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 IDT71256SA25PZ meets industry standards.
7.What is the process for return or replacement of IDT71256SA25PZ?
All IDT71256SA25PZ units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA25PZ, 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 IDT71256SA25PZ part is unused and in its original packaging.
Return procedure for IDT71256SA25PZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA25PZ 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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AT24C08C-STUM-T
Microchip Technology
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