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Renesas HN27C256AG10
- Part No.:
- HN27C256AG10
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
HN27C256AG10.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:17,311
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Product details
Overview
HN27C256AG10 from Hitachi is a 256-kbit UV-erasable and electrically programmable ROM (EPROM), organized as 32,768 × 8 bits, designed for nonvolatile program storage in 16-bit microprocessor systems including Intel 8086 and Motorola 68000. It features 100 ns max access time, +12.5 V programming voltage, and CMOS-compatible low-power operation (25 mW active, 5 µW standby). Its pinout and programming interface are compatible with legacy 256-kbit EPROMs.
For engineers reviewing the HN27C256AG10 datasheet, HN27C256AG10 pinout, HN27C256AG10 application, or HN27C256AG10 equivalent, this page delivers verified technical context on UV-erasable ROM timing, Fast High-Reliability Programming Algorithm implementation, device identifier mode (07h/31h), and cerdip package constraints - critical for legacy system maintenance and EPROM-based firmware replacement.
Technical Context
The HN27C256AG10 implements a 512 × 512 memory matrix with X/Y decoding architecture, supporting full 15-bit address space (A0–A14) and 8-bit bidirectional I/O data bus. Its dual-mode operation includes standard read (VPP = VCC = 5 V), high-voltage programming (VPP = +12.5 V, VCC = 6 V), and device identifier mode (A9 = 12.0 V).
It supports two distinct programming algorithms: Fast High-Reliability Programming (0.2 ms initial pulse, scalable over-programming) and High Performance Programming (1.0 ms pulse, fixed over-programming), both requiring strict sequencing of VCC/VPP application and CE-controlled pulse widths per address location.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 32,768 × 8-bit (256 kbit) nonvolatile storage - sufficient for boot code or firmware in 8086/68000-based embedded controllers. |
| Access time (max) | 100 ns - enables direct interfacing with 10 MHz 8086 systems without wait states. |
| Programming voltage | +12.5 V DC at VPP pin - requires dedicated EPROM programmer with regulated high-voltage supply. |
| Active current (typ) | 25 mW at f = 1 MHz - reduces thermal load in dense PCB layouts during execution. |
| Standby current (typ) | 5 µW - supports ultra-low-power retention in battery-backed or intermittent-use systems. |
| UV erasure dose | ≥15 W·sec/cm² at 2537 Å - defines minimum quartz-window exposure duration for full bit reset to FFh. |
| Operating temperature | 0°C to +70°C - validated for commercial-grade industrial control and instrumentation environments. |
Pinout & Package
HN27C256AG10 is housed in a 600-mil 28-pin ceramic dual in-line package (cerdip, DG-28), with UV-transparent quartz window for erasure. Package dimensions: 36.83 mm × 14.66 mm × 4.8 mm (L × W × H), lead pitch 2.54 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VPP (Pin 1) | Programming power supply | Accepts +12.5 V ±0.5 V only during programming/verify; must be sequenced with VCC and isolated from read-mode logic. |
| A0–A14 (Pins 2–3, 5–10, 12, 23–27) | Address inputs | 15-bit address bus supporting full 32 KB address space; A9 used as high-voltage select for device identifier mode. |
| I/O0–I/O7 (Pins 11, 13–19) | Bidirectional data bus | 8-bit TTL-compatible data path; outputs valid within 100 ns of CE/OE assertion; high-Z when disabled. |
| CE (Pin 20) | Chip enable | Active-low global enable; controls entry into programming mode when combined with VPP and OE states. |
| OE (Pin 22) | Output enable | Active-low output gate; decouples data bus during standby or multi-device sharing to prevent contention. |
| VCC (Pin 28) | Power supply | +5 V ±10% for read mode; +6 V ±0.25 V for programming - must be applied before/removed after VPP. |
| VSS (Pin 14) | Ground | Reference return for all signals; requires low-inductance connection to minimize noise during high-speed read cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Fast High-Reliability Programming Algorithm | Reduces theoretical programming time to 1/10 of conventional methods via adaptive pulse-width scaling (tOPW = 0.2n ms), improving write endurance and data retention. |
| Device identifier mode | Provides manufacturer code (07h) and device code (31h) via A9 = 12.0 V, enabling auto-configuration in intelligent programmers and preventing incorrect programming voltage application. |
| CMOS-compatible low-power design | 25 mW active and 5 µW standby currents allow integration into power-constrained legacy systems without thermal derating or heatsinking. |
| Pin- and software-compatible with prior 256-kbit EPROMs | Same DG-28 footprint, pin functions, and programming voltage requirements permit drop-in replacement in existing sockets and compatibility with legacy Hitachi and third-party programmers. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcomputer Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping in programmable logic controllers built around 8086 or Z80 CPUs. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic boot-time instruction fetch with ≤100 ns latency. Use Value: Enables field-upgradable firmware via UV erasure and reprogramming without board redesign or socket replacement. | Use Scenario: Hosting BIOS or monitor firmware in vintage 16-bit development workstations and single-board computers. IC Role / Device Role / Timing Role: Primary boot ROM accessed during CPU reset vector fetch; supports synchronous read with no wait-state insertion. Use Value: Guarantees reliable startup under varying ambient temperatures (0°C to +70°C) and long-term data retention (>10 years). |
| Medical Instrument Calibration Data | Avionics System Configuration Memory |
Use Scenario: Retaining sensor calibration coefficients and safety-critical lookup tables in portable diagnostic equipment. IC Role / Device Role / Timing Role: Read-only configuration store accessed during power-on self-test (POST) sequence. Use Value: UV-erasability allows secure, traceable recalibration in certified service centers using controlled UV chambers. | Use Scenario: Holding flight control parameter sets and hardware configuration maps in airborne computing modules compliant with DO-160. IC Role / Device Role / Timing Role: Radiation-tolerant nonvolatile memory for mission-critical settings where EEPROM wear-out is unacceptable. Use Value: Ceramic DIP package provides mechanical robustness and hermetic sealing suitable for high-vibration, wide-temperature avionics environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-120 | 120 ns access time; +12.5 V programming; same 28-pin cerdip package and pinout. | Slower timing margin may require wait-state insertion on 10 MHz 8086 buses. | Select when exact 100 ns timing is not required and legacy AMI-compatible tooling is in use. |
| MX27C256A-10 | 100 ns access time; +12.5 V programming; identical 28-pin cerdip mechanical form factor. | Requires verification of device identifier code compatibility with existing programmer firmware. | Prefer for direct timing-equivalent replacement where Hitachi-specific programming sequences are not mandated. |
Compared with AM27C256B-120 and MX27C256A-10, the HN27C256AG10 offers tighter 100 ns access timing and documented Fast High-Reliability Programming support, making it optimal for performance-critical legacy 8086 systems where programming cycle count and data retention are prioritized over generic EPROM interchangeability.
Availability
HN27C256AG10 is available at Aetrix Electronics and suitable for industrial PLC firmware updates, legacy microcomputer boot ROM replacements, and medical instrument calibration data storage requiring stable component supply and long-term maintenance support.
Supply support for HN27C256AG10 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
Hitachi Ltd. (now Renesas Electronics Corporation) was a Japanese multinational conglomerate specializing in semiconductor memory, microcontrollers, and industrial electronics before its semiconductor division merged into Renesas in 2003.
The HN27C256AG Series belongs to Hitachi's EPROM product line, engineered specifically for high-reliability, field-serviceable firmware storage in commercial and industrial 16-bit microprocessor systems requiring UV-erasable nonvolatility and pin-compatible upgrade paths.
FAQ
What is the maximum guaranteed access time for HN27C256AG10?
The HN27C256AG10 has a maximum guaranteed access time of 100 ns under standard read conditions (VCC = 5 V ±10%, Ta = 0°C to +70°C, CE = OE = VIL). This specification ensures compatibility with 10 MHz 8086 systems without external wait-state generation, and is validated across the full operating temperature range.
Does HN27C256AG10 support device identification for automated programming?
Yes, the HN27C256AG10 supports device identifier mode: applying 12.0 V ±0.5 V to A9 while holding CE and OE low outputs manufacturer code 07h and device code 31h on I/O0–I/O7. This enables intelligent programmers to auto-detect voltage and timing requirements, reducing misprogramming risk in mixed-EPROM environments.
What UV exposure is required to fully erase HN27C256AG10?
HN27C256AG10 requires a minimum UV dose of 15 W·sec/cm² at 2537 Å wavelength for complete erasure. Typical erasure time in commercial UV erasers ranges from 15 to 30 minutes depending on lamp intensity and chamber geometry; data must be verified post-erasure as all bits read as FFh.
Can HN27C256AG10 be programmed using standard EPROM programmers?
Yes, HN27C256AG10 is pin- and algorithm-compatible with existing Hitachi 256-kbit EPROM programmers. It supports both High Performance Programming (1.0 ms pulses) and Fast High-Reliability Programming (0.2 ms pulses); verify compatibility with your programmer's firmware version for identifier code recognition and pulse-width control.
What are the critical power sequencing requirements for programming HN27C256AG10?
VCC must be applied simultaneously with or before VPP and removed simultaneously with or after VPP. Violating this sequence risks oxide damage or reduced data retention. During programming, VPP = +12.5 V ±0.5 V and VCC = +6.0 V ±0.25 V must be stable; overshoot beyond 13.5 V on VPP is strictly prohibited.
HN27C256AG10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm) Window
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - UV
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 100 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-CDIP
HN27C256AG10 FAQ
1.How can I place an order for HN27C256AG10 through Aetrix?
Please submit a Request for Quotation (RFQ) for HN27C256AG10 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 HN27C256AG10 reliable?
The price and inventory of HN27C256AG10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HN27C256AG10 is usually 5 days.
3.What payment methods are accepted for HN27C256AG10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HN27C256AG10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HN27C256AG10?
HN27C256AG10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HN27C256AG10 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 HN27C256AG10?
For technical support, including HN27C256AG10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HN27C256AG10 requirements.
6.How does Aetrix verify that HN27C256AG10 is sourced from the original manufacturer or authorized distributors?
All HN27C256AG10 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 HN27C256AG10 meets industry standards.
7.What is the process for return or replacement of HN27C256AG10?
All HN27C256AG10 units undergo pre-shipment inspection (PSI). If there is an issue with HN27C256AG10, 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 HN27C256AG10 part is unused and in its original packaging.
Return procedure for HN27C256AG10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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