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Renesas IDT71256SA20PZ8
- Part No.:
- IDT71256SA20PZ8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA20PZ8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
IDT71256SA20PZ8 from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 20 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, features independent Chip Select and Output Enable pins, and delivers fast read/write cycles for embedded memory buffering in legacy industrial controllers and instrumentation systems.
For engineers reviewing the IDT71256SA20PZ8 datasheet, IDT71256SA20PZ8 pinout, IDT71256SA20PZ8 application, or IDT71256SA20PZ8 equivalent, this device serves as a drop-in replacement for aging 256K×8 SRAMs requiring stable 5 V operation, low standby current (15 mA at CMOS-level deselect), and deterministic asynchronous timing without refresh overhead.
Technical Context
The IDT71256SA20PZ8 implements fully static asynchronous circuitry-no clocks or refresh required-and uses TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) with 5 V ±10 % supply tolerance. Its dual-enable architecture separates chip selection (CS) from output control (OE), enabling precise bus contention management during multi-device memory access.
Timing is defined by fixed-cycle parameters: tRC = 20 ns, tAA = 20 ns, tWC = 20 ns, and tOE = 10 ns. Standby current drops to 15 mA (ISB1) when CS is held above VHC (VCC – 0.2 V), supporting low-power hold modes in battery-backed systems without sacrificing wake-up latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), byte-wide parallel interface |
| Access Time (tAA) | 20 ns maximum - guarantees data valid within 20 ns of address/CS assertion |
| Cycle Time (tRC / tWC) | 20 ns - enables 50 MHz sustained random read/write throughput |
| Supply Voltage | 4.5 V to 5.5 V - compatible with legacy 5 V logic rails and tolerant of ±10 % regulation |
| Standby Current (ISB1) | 15 mA max at CMOS-level deselect - supports low-power retention in always-on subsystems |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, test equipment, and avionics edge computing |
| I/O Compatibility | TTL-level inputs and outputs - interoperable with 74LS, 74F, and microcontroller GPIO without level shifters |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 300-mil width, JEDEC standard footprint, lead-free (Green) compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus (32K = 2¹⁵); latched on CS low transition |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; high-impedance when CS or OE inactive |
| CS | Chip Select | Active-low enable; controls power state (ISB/ISB1) and memory array activation |
| OE | Output Enable | Active-low; gates output drivers independently of CS to manage bus sharing |
| WE | Write Enable | Active-low; initiates write cycle when CS and WE both low; disables outputs during write |
| VCC, GND | Power Supply | Single 5 V supply; decoupling required per JEDEC TSOP layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Fully static operation | No clock, no refresh - eliminates timing-critical DRAM controller logic and simplifies FPGA-based memory interfaces |
| Dual enable control (CS + OE) | Enables selective output gating while keeping memory active - critical for shared-bus arbitration in multi-master systems |
| Low ISB1 standby current | 15 mA at CMOS-level deselect - reduces system sleep-mode power by >60 % vs. TTL-level standby (40 mA) |
| TTL-compatible I/O | Direct connection to 5 V microcontrollers (e.g., Intel 80C188, Motorola 68EC000) without level-shifting components |
| Industrial temperature grade | Validated operation from –40°C to +85°C - suitable for uncontrolled cabinet environments in PLCs and motor drives |
Applications
| Industrial PLC Memory Buffer | Legacy Test Equipment Data Capture |
|---|---|
Use Scenario: Storing real-time I/O scan data and ladder logic state tables in programmable logic controllers with 8-bit data buses. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state memory access for deterministic scan-cycle execution. Use Value: 20 ns access ensures full 32K buffer read/write completes within one 10 µs PLC scan tick, eliminating pipeline stalls. | Use Scenario: Capturing high-speed analog-to-digital samples in benchtop oscilloscopes and signal analyzers with parallel ADC interfaces. IC Role / Device Role / Timing Role: High-reliability static storage buffer holding pre-trigger and post-trigger waveform segments before serial upload. Use Value: TTL-compatible I/O and 20 ns cycle time align precisely with 5 V ADC control timing, avoiding glue logic delays. |
| Avionics Display Frame Buffer | Medical Imaging Control Module |
Use Scenario: Holding rasterized display data for monochrome cockpit displays in certified airborne systems. IC Role / Device Role / Timing Role: Radiation-tolerant (qualified) SRAM serving as non-refreshing frame buffer for FPGA-driven video generators. Use Value: Industrial temp rating and 15 mA ISB1 support cold-soak operation and low-power standby during flight phases with minimal thermal load. | Use Scenario: Storing calibration coefficients and real-time sensor fusion buffers in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: Low-power, high-reliability memory for safety-critical parameter storage with guaranteed data retention during brown-out events. Use Value: Single 5 V supply and 20 ns access enable direct integration with legacy 8051-based controllers, reducing BOM count and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed parallel SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-20ZXI | Same 32K×8 organization, 20 ns speed, but 3.3 V core (5 V tolerant I/O); lower ISB1 (1 µA) | Requires 3.3 V supply rail; unsuitable for pure 5 V systems without regulator | Select only if migrating to mixed-voltage designs with existing 3.3 V infrastructure |
| AS6C4008-20TIN | 20 ns access, industrial temp, but uses different pinout (A0–A15, 16-bit address) and requires external address latch | Not pin-compatible; board redesign needed for A15 and separate latch logic | Consider for new designs prioritizing ultra-low power (ISB = 1 µA) over drop-in replacement |
Compared with CY62256ELL-20ZXI and AS6C4008-20TIN, the IDT71256SA20PZ8 uniquely retains native 5 V operation, identical TSOP-28 pinout, and dual-enable timing control-making it the only option requiring no PCB or firmware changes in legacy 5 V industrial memory upgrades.
Availability
IDT71256SA20PZ8 is available at Aetrix Electronics and suitable for industrial PLCs, legacy test equipment, avionics displays, and medical imaging control modules requiring stable component supply across extended product lifecycles.
Supply support for IDT71256SA20PZ8 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 microcontrollers, analog, power, and memory solutions for automotive, industrial, and enterprise applications.
The IDT71256SA series originates from Integrated Device Technology (acquired by Renesas in 2019) and targets cost-sensitive, reliability-critical embedded systems needing proven 5 V parallel SRAM with industrial temperature qualification and long-term availability.
FAQ
What is the operating voltage range for IDT71256SA20PZ8?
IDT71256SA20PZ8 operates from 4.5 V to 5.5 V DC, with full specification compliance across this range at both commercial and industrial temperatures. This 5 V ±10 % tolerance ensures compatibility with legacy power supplies and eliminates need for precision regulation in retrofitted systems.
Does IDT71256SA20PZ8 require a clock or refresh signal?
No, IDT71256SA20PZ8 uses fully static CMOS design and requires no clock, refresh, or periodic access to retain data. It functions as a true asynchronous memory device-address and control signals alone determine read/write behavior, simplifying interface logic in microcontroller and FPGA designs.
What is the difference between ISB and ISB1 current ratings for IDT71256SA20PZ8?
IDT71256SA20PZ8 specifies two standby currents: ISB (40 mA max) applies when CS > VIH (TTL-high), while ISB1 (15 mA max) applies when CS > VHC (CMOS-high, VCC – 0.2 V). Using CMOS-level deselect reduces standby power by 62.5 %, critical for battery-backed or thermally constrained applications.
Is IDT71256SA20PZ8 pin-compatible with earlier IDT71256 variants?
Yes, IDT71256SA20PZ8 maintains identical pinout and electrical behavior with all IDT71256SA-xPZx variants in TSOP-28 (PZG28) package, including 12 ns, 15 ns, and 25 ns speed grades. Functionally identical control timing and I/O drive strength ensure seamless speed-bin substitution without layout or firmware changes.
What packages are available for IDT71256SA20PZ8 besides TSOP?
IDT71256SA20PZ8 is specifically the TSOP-28 (PZG28) variant. Other package options for the 20 ns speed grade include SOJ-28 (PJG28) and PDIP-28 (PTG28), identified by suffixes YG/YGI and TPG/TPGI respectively-but IDT71256SA20PZ8 itself is TSOP-only and not offered in alternate packages.
IDT71256SA20PZ8 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:
- 20ns
- Access Time:
- 20 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
IDT71256SA20PZ8 FAQ
1.How can I place an order for IDT71256SA20PZ8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA20PZ8 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 IDT71256SA20PZ8 reliable?
The price and inventory of IDT71256SA20PZ8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA20PZ8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA20PZ8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA20PZ8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA20PZ8?
IDT71256SA20PZ8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA20PZ8 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 IDT71256SA20PZ8?
For technical support, including IDT71256SA20PZ8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA20PZ8 requirements.
6.How does Aetrix verify that IDT71256SA20PZ8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA20PZ8 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 IDT71256SA20PZ8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA20PZ8?
All IDT71256SA20PZ8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA20PZ8, 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 IDT71256SA20PZ8 part is unused and in its original packaging.
Return procedure for IDT71256SA20PZ8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA20PZ8 Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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Microchip Technology
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M24C02-FMC6TG
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Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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