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Renesas 71256SA12PZG
- Part No.:
- 71256SA12PZG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
71256SA12PZG.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,733
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Product details
Overview
71256SA12PZG 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 TSOP-28 packaging. It serves as a non-refreshing, fully static memory buffer in embedded controllers, instrumentation data capture, and legacy bus-interface systems requiring deterministic timing.
For engineers reviewing the 71256SA12PZG datasheet, 71256SA12PZG pinout, 71256SA12PZG application, or 71256SA12PZG equivalent, key selection criteria include guaranteed 12 ns read/write cycle time at commercial temperature (0°C to +70°C), low-power standby current (ISB = 50 mA max), TSOP-28 footprint compatibility, and direct TTL-level interfacing without level-shifting.
Technical Context
The 71256SA12PZG implements fully static asynchronous architecture-no clocks, no refresh cycles-enabling deterministic timing for real-time control and burst-mode data buffering. Its dual-control enable scheme uses independent Chip Select (CS) and Output Enable (OE) pins, allowing fast output gating while maintaining address stability during partial bus contention.
It supports WE-controlled and CS-controlled write timing modes per JEDEC-standard SRAM waveforms, with tDW (data valid to end-of-write) specified at 6 ns and tWHZ (write-enable to high-Z) at 6 ns, ensuring reliable handshaking in multiplexed 8-bit data bus environments with mixed-signal peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits); supports byte-wide parallel access without interleaving or banking logic |
| Access Time (tAA) | 12 ns max; enables ≤83 MHz sustained read throughput on synchronous bus interfaces with proper wait-state management |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails without regulation overhead |
| Standby Current (ISB) | 50 mA max at VCC = 5.5 V; reduces system power during idle cycles in battery-backed or energy-constrained modules |
| I/O Compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOL ≤ 0.4 V @ 8 mA); eliminates need for external level translators |
| Operating Temperature | 0°C to +70°C (Commercial grade); validated for stable operation in office, lab, and non-harsh industrial enclosures |
| Package | 28-pin TSOP Type I (PZG28); 8.1 mm × 13.4 mm footprint with 0.55 mm pitch-suitable for high-density PCB layouts |
Pinout & Package
71256SA12PZG is housed in a 28-pin TSOP Type I (PZG28) package with 0.55 mm lead pitch and 8.1 mm × 13.4 mm body dimensions. Pin numbering follows standard TSOP top-view orientation with pin 1 marked by a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting full 32K word selection; latched internally on CS or WE transition |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by CS/WE/OE states-no external transceivers required |
| CS | Chip Select | Active-low enable for device selection; initiates power-up (tPU) and controls standby entry (tPD) |
| OE | Output Enable | Active-low control for output drivers only; allows read data gating independent of CS (tOE = 6 ns max) |
| WE | Write Enable | Active-low write strobe; defines write cycle boundaries and disables outputs during write (tWHZ = 6 ns) |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin per high-speed SRAM layout guidelines |
| GND | Ground Reference | Signal and power ground return; must be connected to low-impedance plane to maintain noise margin |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Static Operation | No clock or refresh circuitry required-simplifies timing design and eliminates hidden refresh latency in real-time systems |
| Dual Enable Control (CS + OE) | Enables fast output disable (tOHZ = 6 ns) without deselecting chip-critical for shared-bus arbitration and glitch-free read bursts |
| Low-Power Standby Mode | ISB1 = 15 mA max under CMOS-level deselection (CS > VHC), reducing quiescent draw in sleep-state applications |
| TTL-Compatible Interface | Direct connection to 5 V microcontrollers, FPGAs, and ASICs without level shifters-reduces BOM count and layout complexity |
| Green Compliant Packaging | Pb-free and RoHS-compliant TSOP construction (per ordering code "G")-meets environmental compliance for global deployments |
Applications
| Industrial Data Loggers | Legacy Industrial PLC I/O Modules |
|---|---|
Use Scenario: Capturing sensor readings at 10 kHz with timestamping and local buffering before Ethernet upload. IC Role / Device Role / Timing Role: High-reliability, non-refreshing memory buffer holding up to 32K samples; synchronized to microcontroller's external bus interface. Use Value: 12 ns access ensures zero-wait-state operation with 8051- or Z80-based controllers, minimizing firmware overhead during burst writes. | Use Scenario: Storing configuration registers and real-time process values in modular I/O backplanes using ISA or VME buses. IC Role / Device Role / Timing Role: Byte-accessible scratchpad memory mapped into CPU address space; co-located with FPGA glue logic for address decoding. Use Value: TSOP-28 footprint allows dense placement near bus connectors; TTL compatibility avoids signal integrity issues on long parallel traces. |
| Medical Diagnostic Equipment UI Buffers | Test & Measurement Front-End Controllers |
Use Scenario: Holding display frame buffers and user-input history in portable ultrasound or ECG devices with ARM7 or ColdFire hosts. IC Role / Device Role / Timing Role: Dedicated display memory segment accessed via DMA; isolated from main program memory to prevent corruption during interrupts. Use Value: Low ISB current extends battery life during screen-off periods; 5 V tolerance matches legacy medical SoC I/O voltage domains. | Use Scenario: Buffering ADC sample streams and command queues in benchtop multimeters and spectrum analyzers. IC Role / Device Role / Timing Role: Dual-port-like behavior achieved via CS/OE sequencing-allows concurrent sampling and host readout with minimal arbitration logic. Use Value: tCLZ = 4 ns ensures rapid output activation after chip select, critical for tight trigger-to-read latency budgets in sub-microsecond measurement windows. |
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, 3.3 V supply, 28-pin SOIC; higher density (128K × 8) but slower and voltage-incompatible | Requires level-shifting and redesign of power delivery; suitable only if system already uses 3.3 V logic and needs larger capacity | Select only if migrating to lower-voltage platform and capacity expansion outweighs timing penalty |
| AS6C4008-12ZIN | 12 ns access, 5 V supply, 28-pin TSOP; same speed and voltage, but rated for -40°C to +85°C industrial range | Supports extended temperature operation without derating; identical pinout and AC timing-drop-in replacement where wider thermal margin is needed | Prefer when operating outside 0°C–70°C envelope; otherwise functionally interchangeable in commercial-grade designs |
Compared with 71256SA12PZG, CY62128EV30LL-45ZSXIT trades speed and voltage compatibility for density, while AS6C4008-12ZIN preserves identical timing and voltage but adds industrial temperature support-making it the closest functional alternative for thermally demanding upgrades.
Availability
71256SA12PZG is available at Aetrix Electronics and suitable for industrial data loggers, legacy PLC I/O modules, and medical diagnostic UI buffers requiring stable component supply, long-lifecycle support, and RoHS-compliant TSOP packaging.
Supply support for 71256SA12PZG 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 enterprise applications.
The 71256SA12PZG belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for cost-sensitive, timing-critical embedded systems requiring pin-compatible replacements for aging 28-pin parallel memory architectures.
FAQ
What is the maximum operating frequency supported by the 71256SA12PZG?
The 71256SA12PZG does not operate on a clock; it is an asynchronous SRAM. Its 12 ns access time supports effective bus frequencies up to approximately 83 MHz in zero-wait-state configurations. Actual achievable throughput depends on system-level timing margins, including address setup/hold, control signal skew, and board trace delays-all defined in the AC Electrical Characteristics table of the 71256SA12PZG datasheet.
Does the 71256SA12PZG require external refresh circuitry?
No, the 71256SA12PZG is a fully static RAM and requires no refresh cycles or external refresh circuitry. Its CMOS latch-based memory cells retain data indefinitely as long as VCC is applied and within specification. This eliminates timing-critical refresh overhead in real-time firmware and simplifies hardware design compared to DRAM solutions.
Can the 71256SA12PZG be used in industrial temperature environments?
No-the 71256SA12PZG is specified only for commercial temperature range (0°C to +70°C). The "12" speed grade is explicitly listed in the Ordering Information table as Commercial-only. For industrial operation (-40°C to +85°C), Renesas offers 71256SA15PZGI and faster variants, but no 12 ns industrial version exists for the 71256SA12PZG.
What is the meaning of the "G" suffix in 71256SA12PZG?
The "G" suffix in 71256SA12PZG indicates Green (lead-free and RoHS-compliant) packaging per Renesas' ordering nomenclature. It confirms the TSOP-28 device meets EU RoHS Directive 2011/65/EU and related environmental regulations, with no intentionally added lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE.
How does the Output Enable (OE) pin function independently of Chip Select (CS) in the 71256SA12PZG?
In the 71256SA12PZG, OE provides fine-grained control over output drivers while CS manages overall device power state. When CS is active (LOW) and OE is toggled, outputs enter high-Z in 6 ns (tOHZ) without affecting internal address decoding or memory array state-enabling clean bus sharing among multiple devices. This separation allows read bursting with dynamic output gating, unlike simpler SRAMs where CS alone controls all I/O activity.
71256SA12PZG 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
71256SA12PZG FAQ
1.How can I place an order for 71256SA12PZG through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA12PZG 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 71256SA12PZG reliable?
The price and inventory of 71256SA12PZG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA12PZG is usually 5 days.
3.What payment methods are accepted for 71256SA12PZG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA12PZG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA12PZG?
71256SA12PZG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA12PZG 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 71256SA12PZG?
For technical support, including 71256SA12PZG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA12PZG requirements.
6.How does Aetrix verify that 71256SA12PZG is sourced from the original manufacturer or authorized distributors?
All 71256SA12PZG 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 71256SA12PZG meets industry standards.
7.What is the process for return or replacement of 71256SA12PZG?
All 71256SA12PZG units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA12PZG, 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 71256SA12PZG part is unused and in its original packaging.
Return procedure for 71256SA12PZG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA12PZG Tags
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