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Renesas IDT71256SA12PZ8
- Part No.:
- IDT71256SA12PZ8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA12PZ8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,886
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Product details
Overview
IDT71256SA12PZ8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with 12 ns access time, TTL-compatible I/O, single 5 V supply operation, and industrial-grade packaging in 28-pin TSOP (PZG28). It serves as main or buffer memory in embedded controllers, data acquisition systems, and legacy industrial PLCs requiring deterministic asynchronous read/write timing.
For engineers reviewing the IDT71256SA12PZ8 datasheet, IDT71256SA12PZ8 pinout, IDT71256SA12PZ8 application, or IDT71256SA12PZ8 equivalent, key selection criteria include guaranteed 12 ns commercial-grade access time, CS/OE dual-control read enable, low-standby current (ISB1 = 15 mA), and TSOP-28 footprint compatibility with legacy board layouts.
Technical Context
The IDT71256SA12PZ8 implements fully static asynchronous circuitry-no clocks or refresh required-and uses high-reliability CMOS fabrication for stable operation across 0°C to +70°C. Its control logic supports independent chip select (CS) and output enable (OE) assertion, enabling fast read cycles with tAA = 12 ns and tOE = 6 ns.
Write operations are controlled via WE and CS active-low signals, with write pulse width tWP = 8 ns minimum and data hold time tDH = 0 ns. All 8 bidirectional I/O lines are TTL-compatible (VIH = 2.2 V min, VIL = 0.8 V max), and power management includes two standby modes: ISB (50 mA at TTL-level CS) and ISB1 (15 mA at CMOS-level CS).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data bus interfacing |
| Access Time (tAA) | 12 ns max; enables sub-83 MHz random read throughput in synchronous bus environments |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails without regulation |
| I/O Compatibility | TTL-level inputs and outputs; interfaces directly with 74LS, 74HC, and microcontroller GPIO without level shifters |
| Standby Current (ISB1) | 15 mA max at CMOS-level CS deassertion; reduces system power during idle periods |
| Operating Temperature | 0°C to +70°C (Commercial grade); validated for use in office, lab, and non-harsh industrial enclosures |
| Package | 28-pin TSOP Type I (PZG28); 400 mil body width, 0.050" lead pitch, surface-mount compatible |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 400 mil body width, 0.050" 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 Lines | 8-bit parallel data path; tristated when CS or OE inactive |
| CS | Chip Select | Active-low enable; device enters standby (ISB/ISB1) when high |
| OE | Output Enable | Active-low read control; enables output drivers independently of CS |
| WE | Write Enable | Active-low write control; latches data on falling edge when CS is low |
| VCC | Power Supply | +5 V supply input; decoupling capacitor required near pin |
| GND | Ground | Signal and power reference; requires low-impedance PCB return path |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh needed-simplifies timing design in microcontroller-based systems |
| Dual Read Control (CS + OE) | Enables fast page-mode-like reads without address changes; tOE = 6 ns supports burst read pipelining |
| Low-Power Standby Modes | ISB1 = 15 mA at CMOS-level CS allows deep sleep in battery-backed or energy-sensitive applications |
| TTL-Compatible I/O | Direct interface with legacy 5 V logic families eliminates external level-shifting components |
| TSOP-28 Footprint | Standardized surface-mount package enables automated assembly and space-constrained PCB layouts |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Memory Expansion |
|---|---|
Use Scenario: Storing real-time I/O status and configuration registers in programmable logic controllers with 8-bit data buses. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer between CPU and field I/O modules; provides zero-wait-state access for deterministic scan-cycle execution. Use Value: 12 ns tAA ensures <1 µs register update latency, critical for sub-millisecond control loop timing. | Use Scenario: Extending on-chip RAM in 8051 or Z80-based embedded systems used in test equipment and medical devices. IC Role / Device Role / Timing Role: External program/data memory mapped into CPU address space; accessed via standard MOVX or LD instructions. Use Value: TTL-compatible I/O and 5 V operation eliminate glue logic, reducing BOM count and layout complexity. |
| Communications Protocol Stack Cache | Automated Test Equipment (ATE) Pattern Memory |
Use Scenario: Caching packet headers and state variables in serial protocol gateways (e.g., Modbus-to-Ethernet bridges). IC Role / Device Role / Timing Role: Fast-access scratchpad for protocol engine; read/written under firmware control during frame parsing/generation. Use Value: Independent OE control allows concurrent address setup and data fetch, improving per-packet processing throughput. | Use Scenario: Storing digital stimulus and expected response vectors in benchtop ATE systems with parallel pattern generators. IC Role / Device Role / Timing Role: High-reliability storage for deterministic vector replay; accessed synchronously by pattern sequencer logic. Use Value: 12 ns access time supports >40 MHz pattern rates, meeting timing margins for 100 Mbps digital I/O testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-12ZSXI | Same 32K × 8 organization, 12 ns speed, but 28-pin SOIC (not TSOP); higher ICC (180 mA vs. 160 mA) | Requires PCB redesign for SOIC footprint; better suited for through-hole prototyping or rework-friendly designs | Select when SOIC handling or hand-soldering is preferred over TSOP reflow assembly |
| AS6C4008-12TIN | 12 ns access, 32K × 8, TSOP-28 package; lower ISB1 (5 µA vs. 15 mA), but only commercial temp (0°C to +70°C) | Superior standby power for battery-buffered applications; identical pinout and voltage specs | Select when ultra-low standby current is prioritized and temperature range matches requirements |
Compared with IDT71256SA12PZ8, CY62256ELL-12ZSXI trades TSOP compactness for SOIC serviceability, while AS6C4008-12TIN delivers 3,000× lower ISB1 at equal speed and footprint-making it ideal for power-constrained commercial systems where industrial temp rating is unnecessary.
Availability
IDT71256SA12PZ8 is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy microcontroller memory expansion, and communications protocol stack caching requiring stable component supply and long-lifecycle support.
Supply support for IDT71256SA12PZ8 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 is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT applications.
IDT71256SA12PZ8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for deterministic, low-latency memory interfacing in 5 V embedded systems with strict timing and reliability requirements.
FAQ
What is the maximum operating frequency supported by the IDT71256SA12PZ8?
The IDT71256SA12PZ8 does not operate on a clock signal-it is an asynchronous SRAM. Its performance is defined by access and cycle times: tAA = 12 ns max and tRC = 12 ns max, supporting effective random-access throughput up to ~83 MHz in ideal conditions. System-level timing depends on controller bus protocol, not internal clocking.
Does the IDT71256SA12PZ8 require external refresh circuitry?
No, the IDT71256SA12PZ8 is a fully static RAM and requires no refresh cycles or external refresh circuitry. Its CMOS memory array retains data indefinitely as long as VCC is applied and CS remains asserted or in standby mode-making it ideal for simple, reliable memory interfacing in microcontroller systems.
Can the IDT71256SA12PZ8 be used with 3.3 V microcontrollers?
The IDT71256SA12PZ8 is specified for 4.5 V to 5.5 V operation and TTL-compatible I/O levels (VIH ≥ 2.2 V, VIL ≤ 0.8 V). Direct connection to 3.3 V logic is not recommended without level translation, as its inputs may not reliably recognize 3.3 V HIGH signals and its 5 V outputs exceed 3.3 V I/O absolute maximum ratings.
What is the difference between ISB and ISB1 standby current in the IDT71256SA12PZ8?
ISB (50 mA max) applies when CS is held at TTL HIGH (>2.0 V), while ISB1 (15 mA max) applies when CS is driven to CMOS HIGH (>VCC – 0.2 V). ISB1 enables deeper power savings in systems where the controller can drive CS fully to VCC, such as with buffered address/control buses or FPGA I/O banks configured for full-swing output.
Is the IDT71256SA12PZ8 RoHS-compliant and halogen-free?
Yes, the IDT71256SA12PZ8 is a Renesas "Green" part-compliant with RoHS Directive 2011/65/EU and halogen-free per IEC 61249-2-21. This is confirmed in the Ordering Information section of the Renesas datasheet (Rev. Jun.29.20), where "Green" availability is explicitly noted for this part number.
IDT71256SA12PZ8 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:
- 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
IDT71256SA12PZ8 FAQ
1.How can I place an order for IDT71256SA12PZ8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA12PZ8 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 IDT71256SA12PZ8 reliable?
The price and inventory of IDT71256SA12PZ8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA12PZ8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA12PZ8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA12PZ8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA12PZ8?
IDT71256SA12PZ8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA12PZ8 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 IDT71256SA12PZ8?
For technical support, including IDT71256SA12PZ8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA12PZ8 requirements.
6.How does Aetrix verify that IDT71256SA12PZ8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA12PZ8 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 IDT71256SA12PZ8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA12PZ8?
All IDT71256SA12PZ8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA12PZ8, 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 IDT71256SA12PZ8 part is unused and in its original packaging.
Return procedure for IDT71256SA12PZ8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA12PZ8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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