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Renesas IDT71256SA12PZ
- Part No.:
- IDT71256SA12PZ
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA12PZ.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
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Product details
Overview
IDT71256SA12PZ from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 12 ns access time, TTL-compatible I/O, single 5 V supply operation, and industrial-grade reliability in TSOP-28 package. It serves as fast, asynchronous main or buffer memory in embedded controllers, data acquisition systems, and legacy industrial PLCs requiring deterministic read/write timing without refresh.
For engineers reviewing the IDT71256SA12PZ datasheet, IDT71256SA12PZ pinout, IDT71256SA12PZ application, or IDT71256SA12PZ equivalent, key selection criteria include its 12 ns tAA/tRC timing, dual chip select architecture (CS + OE), low-power standby modes (ISB1 = 15 mA), and compatibility with 5 V TTL logic families in space-constrained PCB layouts.
Technical Context
The IDT71256SA12PZ implements fully static asynchronous circuitry-no clocks or refresh required-and uses address-decoded memory array architecture with bidirectional TTL-compatible I/O drivers. Its control logic supports independent chip select (CS) and output enable (OE) for flexible bus arbitration and multi-device sharing.
It operates across commercial (0°C to +70°C) and industrial (–40°C to +85°C) temperature ranges, though the 12 ns speed grade is specified for commercial use only per ordering information. Standby current drops to 15 mA under CMOS-level deselection (ISB1), enabling power-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data interface |
| Access Time (tAA) | 12 ns max; enables ≤83 MHz burst read cycles in synchronous glue logic |
| Cycle Time (tRC) | 12 ns max; defines minimum interval between successive read/write operations |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS rails without regulation overhead |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V; achieved when CS > VHC and all inputs at valid logic levels |
| I/O Compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOH ≥ 2.4 V @ –4 mA, VOL ≤ 0.4 V @ 8 mA) |
| Package | 28-pin TSOP Type I (PZG28), 300-mil width; surface-mount compatible with 0.65 mm pitch |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 300-mil body width, 0.65 mm lead pitch, JEDEC MO-153 compliant.
| 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; tristated when CS = high or OE = high |
| CS | Chip Select | Active-low enable; device enters standby (ISB/ISB1) when high |
| OE | Output Enable | Active-low control for read data output; allows CS-driven deselect while preserving bus integrity |
| WE | Write Enable | Active-low write strobe; initiates write cycle when CS and WE both low |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin per high-speed RAM layout rules |
| GND | Ground | Signal reference; requires low-inductance connection to plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Fully static operation | No clock, no refresh, no dynamic timing constraints-simplifies system timing design |
| Dual enable architecture (CS + OE) | Enables hierarchical memory mapping and shared-bus contention management |
| 12 ns access with 6 ns OE-to-output | Supports tight timing margins in microprocessor wait-state interfaces |
| Low ISB1 standby current (15 mA) | Reduces system power during idle periods without sacrificing wake-up latency |
| TTL-compatible I/O | Direct interfacing with legacy 5 V microcontrollers, FPGAs, and ASICs without level shifters |
Applications
| Industrial PLC Data Buffers | Legacy Microcontroller Memory Expansion |
|---|---|
Use Scenario: Real-time I/O scanning in programmable logic controllers where deterministic memory access prevents scan-time jitter. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state data buffering between CPU and field I/O modules. Use Value: 12 ns tAA ensures sub-100 ns memory response, meeting <100 µs PLC scan cycle requirements without CPU stalling. | Use Scenario: External program/data memory for 8-bit/16-bit MCUs (e.g., Intel 8051, Motorola 68HC11) lacking on-chip RAM. IC Role / Device Role / Timing Role: Byte-wide parallel memory mapped into MCU external address space via A0–A14 and I/O0–I/O7. Use Value: TTL-compatible signaling eliminates level-shifting components; 28-pin TSOP fits compact industrial control board footprints. |
| Communications Protocol Analyzers | Test Equipment FIFO Buffers |
Use Scenario: Capturing high-speed serial protocol frames (RS-485, CAN, Modbus RTU) for real-time analysis and storage. IC Role / Device Role / Timing Role: High-speed capture buffer synchronized to UART/USART clock domains using CS/OE handshaking. Use Value: 12 ns access enables reliable sampling at up to 83 Mbps effective throughput when paired with fast DMA controllers. | Use Scenario: Intermediate storage between ADC front-end and DSP processor in automated test equipment. IC Role / Device Role / Timing Role: Dual-port-like behavior enabled by separate CS/OE controls for simultaneous capture and readout coordination. Use Value: Low ISB1 current (15 mA) extends battery life in portable test instruments during idle acquisition phases. |
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, 3.3 V supply, 28-pin SOIC; lower speed but lower voltage and newer process | Suitable for 3.3 V systems; not drop-in for 5 V TTL buses due to VIH/VIL mismatch | Select when migrating to 3.3 V designs and timing budget allows ≥45 ns latency |
| AS6C4008-12ZIN | 12 ns access, 5 V supply, 28-pin TSOP; same speed and voltage, but different manufacturer timing specs and qualification | Pinout identical; supports same industrial temp range (–40°C to +85°C) at 12 ns grade | Valid alternative for new designs requiring 12 ns 5 V SRAM with extended temperature support |
Compared with IDT71256SA12PZ, CY62128EV30LL-45ZSXIT trades speed and voltage compatibility for modern low-power operation, while AS6C4008-12ZIN matches speed, voltage, and package-but requires validation of tOH, tDH, and ISB1 against system timing margins.
Availability
IDT71256SA12PZ is available at Aetrix Electronics and suitable for industrial automation, legacy microcontroller upgrades, and communications protocol analyzers requiring stable component supply and long-lifecycle availability.
Supply support for IDT71256SA12PZ 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 IoT applications.
IDT71256SA12PZ belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for 5 V TTL-based embedded systems needing deterministic, no-refresh memory with industrial temperature resilience.
FAQ
What is the operating temperature range for IDT71256SA12PZ?
IDT71256SA12PZ is rated for commercial temperature operation only: 0°C to +70°C. Although other speed grades (e.g., 15/20/25 ns) support industrial –40°C to +85°C operation, the 12 ns variant is explicitly restricted to commercial grade per Renesas' ordering information and datasheet revision notes dated Nov. 3, 2014.
Does IDT71256SA12PZ require a clock or refresh signal?
No, IDT71256SA12PZ uses fully static CMOS circuitry and requires neither a clock nor periodic refresh. It retains data indefinitely as long as VCC and GND are applied and inputs remain within valid logic levels-making it ideal for simple, deterministic memory interfaces in microcontroller and FPGA systems.
Can IDT71256SA12PZ be used with 3.3 V logic systems?
IDT71256SA12PZ is specified for 4.5 V to 5.5 V operation and features TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V). While it may function with 3.3 V outputs under certain conditions, VOH and VOL are guaranteed only at VCC = 5 V, and direct connection to 3.3 V-only logic risks marginal signaling-level translation is recommended for robust interoperability.
What is the meaning of ISB1 versus ISB in IDT71256SA12PZ specifications?
ISB (standby current at TTL-level CS) is 50 mA max, while ISB1 (standby current at CMOS-level CS) is 15 mA max. ISB1 applies when CS > VHC (≈4.8 V at VCC = 5 V), enabling deeper power savings in systems that can drive CS to near-VCC. This dual-mode standby supports flexible power management strategies in battery-backed or energy-conscious designs using IDT71256SA12PZ.
Is IDT71256SA12PZ still recommended for new designs?
Renesas removed the "Not recommended for new designs" notice in Feb. 2001, and the latest datasheet revision (Jun. 29, 2020) confirms IDT71256SA12PZ remains active and supported. However, designers should verify long-term availability with Aetrix Electronics and consider AS6C4008-12ZIN as a second-source option with identical 12 ns/5 V/TSOP specs and industrial temp support.
IDT71256SA12PZ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
IDT71256SA12PZ FAQ
1.How can I place an order for IDT71256SA12PZ through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA12PZ 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 IDT71256SA12PZ reliable?
The price and inventory of IDT71256SA12PZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA12PZ is usually 5 days.
3.What payment methods are accepted for IDT71256SA12PZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA12PZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA12PZ?
IDT71256SA12PZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA12PZ 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 IDT71256SA12PZ?
For technical support, including IDT71256SA12PZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA12PZ requirements.
6.How does Aetrix verify that IDT71256SA12PZ is sourced from the original manufacturer or authorized distributors?
All IDT71256SA12PZ 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 IDT71256SA12PZ meets industry standards.
7.What is the process for return or replacement of IDT71256SA12PZ?
All IDT71256SA12PZ units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA12PZ, 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 IDT71256SA12PZ part is unused and in its original packaging.
Return procedure for IDT71256SA12PZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA12PZ Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT24C08C-STUM-T
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