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Renesas IDT71256SA25PZ8
- Part No.:
- IDT71256SA25PZ8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
IDT71256SA25PZ8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,119
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Product details
Overview
IDT71256SA25PZ8 from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with 25 ns access and cycle times, TTL-compatible I/O, single 5 V supply operation, and industrial-grade temperature support (–40°C to +85°C). It serves as a non-refreshing, asynchronous memory buffer in embedded controllers, legacy instrumentation, and real-time data acquisition systems requiring deterministic read/write timing.
For engineers reviewing the IDT71256SA25PZ8 datasheet, IDT71256SA25PZ8 pinout, IDT71256SA25PZ8 application, or IDT71256SA25PZ8 equivalent, this device delivers verified 25 ns tAA/tRC performance, low-impedance bidirectional I/O control via OE/CS/WE, and TSOP-28 packaging suited for space-constrained PCB layouts with legacy bus interfaces.
Technical Context
The IDT71256SA25PZ8 implements fully static asynchronous circuitry-no clocks or refresh cycles required-and uses dual-control enable logic: Chip Select (CS) gates memory activation while Output Enable (OE) independently controls output driver state. This allows fast read access (tOE = 11 ns max) and precise output disable timing (tOHZ = 10 ns max).
It supports two standby modes: TTL-level ISB (50 mA max at 25 ns speed) when CS > VIH, and lower-power CMOS-level ISB1 (15 mA max) when CS > VHC and inputs are rail-rail. All I/O pins are bidirectional with ±4 mA drive strength, 0.4 V VOL, and 2.4 V VOH under worst-case VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data bus interfacing without external demultiplexing |
| Access Time (tAA) | 25 ns max; guarantees valid data at I/O pins within 25 ns of address stabilization under VCC = 4.5–5.5 V |
| Read Cycle Time (tRC) | 25 ns max; defines minimum interval between successive read operations on same address range |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails without level-shifting |
| Operating Temperature | –40°C to +85°C; qualified for industrial environments including factory automation and transportation electronics |
| Package | 28-pin TSOP Type I (PZG28); 8.1 mm × 13.4 mm footprint, surface-mount compatible, JEDEC MO-153 compliant |
| Standby Current (ISB1) | 15 mA max; achieved only when CS driven above VHC threshold (VCC – 0.2 V), enabling ultra-low power sleep mode |
Pinout & Package
Package: 28-pin TSOP Type I (PZG28), 8.1 mm × 13.4 mm body, 0.5 mm lead pitch, gull-wing leads. Pin 1 marked by notch or dot; top-view orientation per Renesas drawing 2948 drw 02a.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus; selects one of 32,768 memory locations; latched on rising edge of CS or WE transitions |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; tristated when CS = high or OE = high; TTL-compatible input thresholds and output drive |
| CS | Chip Select | Active-low enable; memory active only when low; enables ISB1 standby mode when held above VHC |
| OE | Output Enable | Active-low control of output drivers; independent of CS; allows read data gating without deselecting chip |
| WE | Write Enable | Active-low write strobe; initiates write cycle when CS and WE both low; controls data capture timing (tWP = 20 ns min) |
| VCC | Power Supply | +5 V nominal supply; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin |
| GND | Ground Reference | Signal and power ground return; must be connected to low-impedance PCB plane |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock, no refresh, no wait states-simplifies timing-critical microcontroller or FPGA memory interfaces |
| Dual-Enable Read Control (CS + OE) | Enables partial bus sharing: OE can gate outputs while CS remains asserted, reducing bus contention risk |
| TTL-Compatible I/O | Direct connection to 5 V microcontrollers and FPGAs without level translators; VIH = 2.2 V min, VOL = 0.4 V max |
| Two-Tier Standby Power Modes | ISB = 40 mA (TTL-level CS inactive), ISB1 = 15 mA (CMOS-level CS inactive); selectable via drive strength |
| Industrial Temperature Qualification | Guaranteed functionality across –40°C to +85°C with full AC/DC specs met-no derating required |
Applications
| Industrial PLC Data Buffers | Legacy Test Equipment Memory |
|---|---|
|
Use Scenario: Storing real-time sensor samples and control setpoints in programmable logic controllers with deterministic scan cycles. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer between CPU and I/O modules; provides zero-wait-state access during 10–100 µs scan intervals. Use Value: 25 ns tRC ensures full 32K-byte frame reads/writes within single PLC scan period; TSOP package fits dense backplane layouts. |
Use Scenario: Holding calibration tables and waveform capture buffers in benchtop oscilloscopes and signal generators built on 1990s-era ASIC platforms. IC Role / Device Role / Timing Role: Non-volatile shadow RAM replacement for battery-backed NVSRAM; retains data during brief power loss. Use Value: 15 mA ISB1 current enables >100-hour hold-up time with small backup capacitors; TTL compatibility avoids redesign of legacy bus drivers. |
| Avionics Display Frame Buffers | Ruggedized Medical Imaging Modules |
|
Use Scenario: Serving as pixel line buffers in cockpit display units where EMI resilience and thermal stability are critical. IC Role / Device Role / Timing Role: High-reliability frame buffer element synchronized to video timing generator; operates without refresh-induced jitter. Use Value: Industrial temp rating and 25 ns tAA ensure consistent pixel latency across cabin temperature swings; green (RoHS) variant meets DO-160E emissions requirements. |
Use Scenario: Buffering ultrasound A-scan data streams in portable diagnostic devices subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: Deterministic acquisition memory between ADC and DSP; handles burst-mode sampling at up to 20 MSPS. Use Value: Bidirectional I/O and tDW = 13 ns guarantee clean data handoff to downstream processors; TSOP package withstands reflow and mechanical shock per IPC-7351B. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZAXI | 32K × 8-bit, 45 ns access, 3.3 V core (with 5 V tolerant I/O), 28-pin SOIC | Lower power (ISB = 1 µA), but slower and incompatible with pure 5 V systems | Select if migrating to 3.3 V architecture and board layout allows SOIC footprint change |
| AS6C4008-25ZIN | 32K × 8-bit, 25 ns access, 5 V operation, 28-pin TSOP-28, industrial temp | Same speed and package; higher ICC (160 mA vs. 145 mA), identical pinout | Drop-in replacement with identical timing and layout; verify VIL/VOL margins match host system |
Compared with IDT71256SA25PZ8, CY62128EV30LL-45ZAXI trades speed for ultra-low standby power and voltage scalability, while AS6C4008-25ZIN matches timing and form factor exactly but draws slightly more active current-making it ideal for direct replacement where layout reuse is mandatory.
Availability
IDT71256SA25PZ8 is available at Aetrix Electronics and suitable for industrial PLC data buffers, legacy test equipment memory, avionics display frame buffers, and ruggedized medical imaging modules requiring stable component supply across extended lifecycle programs.
Supply support for IDT71256SA25PZ8 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 infrastructure markets.
IDT71256SA25PZ8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for deterministic, low-latency memory interfacing in 5 V industrial and aerospace systems where refresh-free operation and wide temperature tolerance are essential.
FAQ
What is the maximum operating frequency supported by IDT71256SA25PZ8?
IDT71256SA25PZ8 does not use a clock and therefore has no operating frequency specification. Its performance is defined by timing parameters: maximum read/write cycle time is 25 ns, supporting effective burst transfer rates up to 40 MHz in systems with zero wait-state bus controllers. The device relies on asynchronous control signals (CS, OE, WE) rather than synchronous clocking.
Does IDT71256SA25PZ8 require external refresh circuitry?
No, IDT71256SA25PZ8 is a fully static RAM and requires no refresh circuitry. Its CMOS latch-based memory cells retain data indefinitely as long as power is applied and all DC operating conditions (VCC, temperature, input levels) remain within specification. This eliminates refresh overhead in microcontroller or FPGA designs.
Can IDT71256SA25PZ8 operate reliably at 4.5 V supply voltage?
Yes, IDT71256SA25PZ8 is fully specified from 4.5 V to 5.5 V. At VCC = 4.5 V, all AC parameters-including tAA = 25 ns, tRC = 25 ns, and tOE = 11 ns-are guaranteed across the full industrial temperature range (–40°C to +85°C), and DC parameters such as VOL ≤ 0.4 V and VOH ≥ 2.4 V remain valid.
Is the pinout of IDT71256SA25PZ8 compatible with other 28-pin TSOP SRAMs?
IDT71256SA25PZ8 uses the industry-standard 28-pin TSOP Type I (PZG28) pinout defined in JEDEC MO-153. Its address, data, and control pin assignments match those of AS6C4008-25ZIN and IS61LV25616AL-25TLI, enabling direct PCB footprint reuse-provided voltage and timing margins align with the host system design.
What is the meaning of the '8' suffix in IDT71256SA25PZ8?
The '8' suffix in IDT71256SA25PZ8 indicates tape-and-reel packaging: 1,000 units per reel. This format is optimized for automated SMT assembly lines. The base part IDT71256SA25PZG denotes the same device in tube packaging; both share identical electrical, thermal, and mechanical specifications.
IDT71256SA25PZ8 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:
- 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
IDT71256SA25PZ8 FAQ
1.How can I place an order for IDT71256SA25PZ8 through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT71256SA25PZ8 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 IDT71256SA25PZ8 reliable?
The price and inventory of IDT71256SA25PZ8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT71256SA25PZ8 is usually 5 days.
3.What payment methods are accepted for IDT71256SA25PZ8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT71256SA25PZ8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT71256SA25PZ8?
IDT71256SA25PZ8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT71256SA25PZ8 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 IDT71256SA25PZ8?
For technical support, including IDT71256SA25PZ8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT71256SA25PZ8 requirements.
6.How does Aetrix verify that IDT71256SA25PZ8 is sourced from the original manufacturer or authorized distributors?
All IDT71256SA25PZ8 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 IDT71256SA25PZ8 meets industry standards.
7.What is the process for return or replacement of IDT71256SA25PZ8?
All IDT71256SA25PZ8 units undergo pre-shipment inspection (PSI). If there is an issue with IDT71256SA25PZ8, 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 IDT71256SA25PZ8 part is unused and in its original packaging.
Return procedure for IDT71256SA25PZ8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IDT71256SA25PZ8 Tags
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