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Renesas IDT71256SA12PZI
- Part No.:
- IDT71256SA12PZI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA12PZI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
IDT71256SA12PZI from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 12 ns access time, industrial temperature range (–40°C to +85°C), TSOP-28 package, and TTL-compatible bidirectional I/O. It operates from a single 5 V supply, uses fully static asynchronous logic (no clock or refresh), and supports fast read/write cycles in embedded controllers, legacy industrial PLCs, and real-time data buffering systems.
For engineers reviewing the IDT71256SA12PZI datasheet, IDT71256SA12PZI pinout, IDT71256SA12PZI application, or IDT71256SA12PZI equivalent, key selection criteria include guaranteed 12 ns access at industrial temperature, low standby current (ISB1 = 15 mA), dual chip select/output enable control, and compatibility with legacy 5 V bus architectures requiring pin-level TTL signaling.
Technical Context
The IDT71256SA12PZI implements a fully static memory array with asynchronous address decoding and independent chip select (CS) and output enable (OE) control lines-enabling flexible read timing and output gating. Its internal logic ensures no hold time violations during address transitions and guarantees tOH = 3 ns output hold from address change.
It features two distinct standby modes: ISB (TTL-level CS deassertion, 40 mA max) and ISB1 (CMOS-level CS deassertion, 15 mA max), allowing power optimization based on system-level control voltage thresholds. All inputs meet standard TTL voltage levels (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and drive outputs compliant with VOH ≥ 2.4 V and VOL ≤ 0.4 V under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data interface without external data multiplexing |
| Access Time (tAA) | 12 ns maximum at TA = –40°C to +85°C; enables 83 MHz burst read capability in synchronous bus wrappers |
| Supply Voltage | 4.5 V to 5.5 V; compatible with legacy 5 V logic rails and tolerant of ±10% regulation variation |
| Standby Current (ISB1) | 15 mA maximum at VCC = 5.5 V, CMOS-level CS deassertion; reduces idle power in always-on industrial modules |
| I/O Compatibility | TTL-input/outputs; interfaces directly with 74LS/74ALS families and microcontrollers lacking level-shifting circuitry |
| Operating Temperature | –40°C to +85°C; qualified for use in uncontrolled industrial enclosures and outdoor telemetry hardware |
| Package | 28-pin TSOP Type I (PZG28); 8.1 mm × 13.4 mm footprint, surface-mount compatible with reflow assembly |
Pinout & Package
28-pin TSOP Type I (PZG28) package with 0.5 mm pitch, JEDEC MO-153 compliant, body size 8.1 mm × 13.4 mm × 1.2 mm. Pin 1 marked by notch or dot; top-side marking includes "71256SA12PZI" and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus; selects one of 32,768 memory locations; no internal latching - requires stable address during CS low |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; tri-stated when CS high or OE high; no external bus transceivers required |
| CS | Chip Select | Active-low enable; device enters standby (ISB or ISB1) when high; controls power state independently of OE |
| OE | Output Enable | Active-low read gate; enables output drivers only when CS is also low; allows output disable without deselecting chip |
| WE | Write Enable | Active-low write strobe; initiates write cycle on falling edge concurrent with CS low; no write protection pin |
| VCC | Power Supply | +5 V supply input; bypass capacitor (0.1 µF) recommended adjacent to pin for noise suppression |
| GND | Ground | Signal and power reference; must be connected to system ground plane with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns industrial-grade access time | Guaranteed tAA ≤ 12 ns across full –40°C to +85°C range - eliminates need for speed-binning in harsh-environment designs |
| Dual standby current modes | ISB1 = 15 mA (CMOS-level CS) enables ultra-low-power sleep states; ISB = 40 mA (TTL-level CS) supports simpler control logic |
| Independent OE and CS control | Allows output disabling while keeping chip selected - critical for bus arbitration and multi-drop memory sharing |
| Single 5 V supply operation | Eliminates need for dual-rail regulators or charge pumps; simplifies power delivery in space-constrained industrial PCBs |
| TTL-compatible I/O | Direct interface with legacy microcontrollers (e.g., Intel 80C188, Motorola 68EC000) and FPGA I/O banks without level shifters |
Applications
| Industrial PLC Data Buffers | Legacy Microcontroller Memory Expansion |
|---|---|
Use Scenario: Real-time I/O scanning in programmable logic controllers where sensor data must be captured and retained across scan cycles without CPU intervention. IC Role / Device Role / Timing Role: Standalone static RAM providing non-refreshed, deterministic-access scratchpad memory mapped into the controller's external bus space. Use Value: 12 ns tAA ensures sub-microsecond data capture latency; ISB1 mode cuts background power to 15 mA during idle scans - extending thermal margin in sealed cabinets. | Use Scenario: Adding external program/data memory to 8/16-bit microcontrollers (e.g., Zilog Z180, Hitachi H8/300) with limited on-chip RAM. IC Role / Device Role / Timing Role: Asynchronous byte-wide memory peripheral accessed via dedicated address/data bus and control signals (CS/OE/WE). Use Value: TTL-compatible I/O and 5 V operation eliminate level-shifting components; 28-pin TSOP footprint fits tight board layouts typical of retro-computing and instrumentation designs. |
| Telecom Line Card Buffering | Medical Diagnostic Equipment Frame Stores |
Use Scenario: Temporary storage of packetized voice or control data in TDM-based telecom line cards operating in temperature-uncontrolled central office environments. IC Role / Device Role / Timing Role: High-reliability buffer between serial interface ICs and host DSPs, supporting burst reads/writes synchronized to frame clocks. Use Value: Industrial temperature rating (–40°C to +85°C) ensures uninterrupted operation in un-air-conditioned telco cabinets; tCLZ = 4 ns enables rapid output activation after CS assertion. | Use Scenario: Capturing and holding digitized analog waveforms (e.g., ECG, EEG) prior to FFT processing in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-latency acquisition memory interfaced to ADC controllers and DMA engines in safety-critical medical subsystems. Use Value: Guaranteed 12 ns access time supports >80 kSPS continuous sampling; green (lead-free) PZG28 package complies with IEC 60601-1 material restrictions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZSXIT | 45 ns access time, 32K × 8, 2.5 V core / 3.3 V I/O, 32-pin TSOP | Lower voltage, slower speed, larger package - unsuitable for 5 V legacy bus or <20 ns timing-critical use | Select only if migrating to 3.3 V architecture and relaxing timing constraints |
| AS6C4008-12PIN | 12 ns access, 512K × 8, 32-pin SOJ, 5 V only, industrial temp | Double density, different pinout (32-pin vs. 28-pin), no OE pin - requires PCB redesign and firmware adaptation | Consider only for capacity upgrade paths where board revision is acceptable |
Compared with CY62128EV30LL-45ZSXIT and AS6C4008-12PIN, the IDT71256SA12PZI uniquely delivers 12 ns industrial-grade performance in a compact 28-pin TSOP with TTL-compatible 5 V I/O - making it irreplaceable in retrofitting legacy 5 V systems without layout changes or voltage translation.
Availability
IDT71256SA12PZI is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller upgrades, telecom line cards, and medical waveform capture systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for IDT71256SA12PZI 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, infrastructure, and IoT applications.
The IDT71256SA product line was originally developed by Integrated Device Technology (IDT) and continues under Renesas as a legacy high-reliability SRAM family targeting industrial and telecom equipment requiring proven 5 V TTL-compatible memory with guaranteed timing across extended temperatures.
FAQ
What is the maximum guaranteed access time for IDT71256SA12PZI across its full operating temperature range?
The IDT71256SA12PZI has a maximum guaranteed address access time (tAA) of 12 ns over the full industrial temperature range of –40°C to +85°C. This specification is production-tested and applies to all units shipped under this part number, ensuring deterministic timing behavior in thermally demanding applications without derating.
Does IDT71256SA12PZI require a refresh circuit or clock signal to retain data?
No, the IDT71256SA12PZI is a fully static RAM and requires no refresh circuitry or clock signal. Its CMOS memory array retains data indefinitely as long as VCC is maintained within 4.5 V to 5.5 V and ambient temperature remains within –40°C to +85°C. This eliminates refresh overhead in microcontroller-based systems and simplifies power management design.
Can IDT71256SA12PZI be used with modern 3.3 V microcontrollers?
IDT71256SA12PZI is specified for 5 V operation only (VCC = 4.5–5.5 V) and features TTL-compatible I/O thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V). While some 3.3 V controllers may tolerate 5 V inputs, direct connection risks damage or unreliable operation. A level-shifting buffer or voltage translator is required for safe interfacing with 3.3 V logic.
What is the difference between ISB and ISB1 standby current specifications for IDT71256SA12PZI?
IDT71256SA12PZI defines two standby modes: ISB (40 mA max) activates when CS rises above VIH (≥2.2 V), matching TTL logic thresholds; ISB1 (15 mA max) activates only when CS exceeds VHC (VCC – 0.2 V), requiring CMOS-level deassertion. Designers select ISB1 for lowest power but must ensure control logic meets tighter voltage thresholds.
Is IDT71256SA12PZI RoHS-compliant and lead-free?
Yes, IDT71256SA12PZI is a green (lead-free) device compliant with RoHS Directive 2011/65/EU and REACH regulations. The "PZI" suffix denotes industrial temperature grade and lead-free TSOP packaging, and the device carries appropriate markings per J-STD-609. Full compliance documentation is available upon request from Aetrix Electronics.
IDT71256SA12PZI 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:
- 12ns
- Access Time:
- 12 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
IDT71256SA12PZI FAQ
1.How can I place an order for IDT71256SA12PZI through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA12PZI 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 IDT71256SA12PZI reliable?
The price and inventory of IDT71256SA12PZI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA12PZI is usually 5 days.
3.What payment methods are accepted for IDT71256SA12PZI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA12PZI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA12PZI?
IDT71256SA12PZI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA12PZI 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 IDT71256SA12PZI?
For technical support, including IDT71256SA12PZI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA12PZI requirements.
6.How does Aetrix verify that IDT71256SA12PZI is sourced from the original manufacturer or authorized distributors?
All IDT71256SA12PZI 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 IDT71256SA12PZI meets industry standards.
7.What is the process for return or replacement of IDT71256SA12PZI?
All IDT71256SA12PZI units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA12PZI, 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 IDT71256SA12PZI part is unused and in its original packaging.
Return procedure for IDT71256SA12PZI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA12PZI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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