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Microchip Technology AT27C800-12RC
- Part No.:
- AT27C800-12RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-SOIC (0.525", 13.34mm Width)
- Datasheet:
-
AT27C800-12RC.pdf
- Description:
- IC EPROM 8MBIT PARALLEL 44SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
AT27C800-12RC from Atmel is a one-time programmable (OTP) EPROM organized as 512K × 16 or 1024K × 8, operating on a single 5V ±10% supply, with 120 ns read access time, CMOS/TTL-compatible I/O, and dual-mode byte/word configuration via BYTE/VPP pin - used for firmware storage in 16-/32-bit microprocessor systems.
For engineers reviewing the AT27C800-12RC datasheet, AT27C800-12RC pinout, AT27C800-12RC application, or AT27C800-12RC equivalent, this page delivers verified package mapping (44-lead SOIC), organization-selectable interface behavior, standby current ≤100 µA, rapid 50 µs/word programming, and JEDEC-standard timing compliance for legacy embedded design continuity.
Technical Context
The AT27C800-12RC implements a two-line control architecture (CE/OE) to prevent bus contention in high-speed systems and supports configurable x16 word-wide or x8 byte-wide data access through voltage-level sensing on the BYTE/VPP pin. Its output enable logic ensures deterministic tri-state behavior during transitions.
It uses high-reliability CMOS technology with 2,000 V ESD protection and 200 mA latch-up immunity, and features an integrated product identification code readable via A9 and A0 toggling - enabling automated programming equipment recognition without external metadata.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8,388,608 bits (512K × 16 or 1024K × 8) |
| Read Access Time | 120 ns maximum - eliminates WAIT states in 5 MHz microprocessor buses |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails |
| Standby Current | ≤100 µA - enables low-power retention in battery-backed systems |
| Active Current | ≤50 mA at 5 MHz - supports sustained burst reads without thermal derating |
| Programming Speed | 50 µs/word typical - reduces firmware update cycle time in production programming |
| ESD Protection | 2,000 V HBM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
AT27C800-12RC is supplied in a 44-lead, 0.525" wide plastic gull-wing small outline package (SOIC/SOP), JEDEC MO-142 compliant, with 1.27 mm lead pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word or 1024K-byte addressing |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; O15/A-1 functions as data or address depending on BYTE/VPP state |
| BYTE/VPP | Mode Select / Program Supply | High = x16 word mode; Low = x8 byte mode; during programming, driven to 13.0 V for OTP write |
| CE | Chip Enable | Active-low chip select enabling memory access only when asserted |
| OE | Output Enable | Active-low output gate controlling data bus drive vs. high-impedance float |
| VCC | Power Supply | Primary 5V ±10% supply rail powering core logic and I/O buffers |
| GND | Ground | Reference node for all input thresholds and output voltage levels |
| NC | No Connect | Unbonded pins (A8, A9, A10, A11, A12 in SOIC) - must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Configurable x16/x8 Organization | Single-pin (BYTE/VPP) selection enables reuse across 16-bit and 8-bit data bus architectures without redesign |
| Rapid™ Programming Algorithm | Guaranteed 50 µs/word programming with auto-verify loop - reduces production programming time by >60% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer (0x1E1E) and device code (0xF8F8) readable via A9/A0 - enables secure, tool-agnostic programming validation |
| Two-Line Control (CE/OE) | Eliminates bus contention in multi-device systems - simplifies address decoding and timing margining |
| JEDEC-Standard Packages | SOIC (44R), PDIP (42P6), PLCC (44J), TSOP (48T) - ensures drop-in replacement across legacy board revisions |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Retention |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers requiring long-term data integrity without refresh. IC Role / Device Role / Timing Role: Nonvolatile firmware ROM providing boot-time instruction fetch and runtime parameter lookup with 120 ns access latency. Use Value: Eliminates reliance on volatile RAM + battery backup; withstands 85°C ambient and repeated power cycling over 10-year deployments. |
Use Scenario: Holding POST routines and hardware initialization code in early-generation desktop motherboards where flash memory was not yet standardized. IC Role / Device Role / Timing Role: Primary boot ROM accessed directly by x86 reset vector at power-on, delivering deterministic 5 MHz bus timing. Use Value: Enables reliable cold-start operation without firmware corruption risk - critical for BIOS recovery in field-deployed systems. |
| Medical Device Bootloader | Avionics Configuration Memory |
Use Scenario: Storing immutable bootloader code in Class II medical instruments (e.g., infusion pumps) where firmware tampering must be physically prevented. IC Role / Device Role / Timing Role: One-time programmable ROM ensuring bootloader integrity; accessed during power-up sequence before any writable memory initialization. Use Value: Meets IEC 62304 §5.5.3 requirement for immutable startup code - no software patching or field reprogramming possible post-manufacture. |
Use Scenario: Holding aircraft-specific configuration data (e.g., sensor calibration offsets, flight control limits) in certified avionics modules subject to DO-254 design assurance. IC Role / Device Role / Timing Role: Read-only configuration store accessed during system self-test prior to flight mode activation. Use Value: Provides traceable, unalterable configuration baseline - satisfies FAA AC 20-152A requirements for hardware-software co-validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C800-12DC | Same 8-Mbit density, 120 ns speed, and SOIC-44 package; requires 12.5 V VPP for programming vs. AT27C800-12RC's 13.0 V | Identical boot ROM use case; differs only in programming voltage tolerance and minor AC timing skew (tACC = 120 ns vs. 125 ns) | Select when existing programming infrastructure supports 12.5 V VPP and JEDEC-compliant timing margins allow 5 ns tACC relaxation |
| MX27C800PC-12 | Pin-compatible SOIC-44 OTP EPROM; higher standby current (200 µA max) and no integrated ID code | Functional substitute for firmware storage but lacks A9/A0-based device identification - requires external verification step in programming flow | Choose only if cost sensitivity outweighs need for automated programming validation and ultra-low standby current |
Compared with AM27C800-12DC and MX27C800PC-12, the AT27C800-12RC offers tighter standby current (100 µA), built-in ID code for programming tool interoperability, and guaranteed 120 ns tACC - making it preferable for power-constrained, high-assurance, or automated production environments.
Availability
AT27C800-12RC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS retention, medical device bootloaders, avionics configuration memory, and embedded system boot ROM applications requiring stable component supply and long-term obsolescence management.
Supply support for AT27C800-12RC 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
Atmel Corporation (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs for industrial, automotive, and consumer applications.
The AT27C800 series was designed as a drop-in replacement for legacy UV-erasable EPROMs in systems requiring one-time programmable, high-reliability firmware storage - targeting industrial control, computing, and aerospace platforms with strict qualification requirements.
FAQ
What is the correct programming voltage for AT27C800-12RC?
The AT27C800-12RC requires VPP = 13.0 V ± 0.25 V during programming, applied to the BYTE/VPP pin while VCC is held at 6.5 V ± 0.25 V. This voltage level is strictly defined in the DC Programming Characteristics table and must be maintained for reliable 50 µs/word programming - using 12.5 V or lower risks incomplete cell programming and verification failure.
Does AT27C800-12RC support both x8 and x16 data bus configurations?
Yes, AT27C800-12RC supports both configurations via the BYTE/VPP pin: when driven high (VIH), it operates in 512K × 16 word-wide mode with O15/A-1 as data output; when driven low (VIL), it operates in 1024K × 8 byte-wide mode with O15/A-1 repurposed as address bit A-1. This dual-mode capability is electrically validated and documented in the Operating Modes table.
What is the maximum operating temperature range for AT27C800-12RC?
The AT27C800-12RC is rated for industrial temperature operation from –40°C to +85°C, as confirmed by the Ordering Information table where "-12RI" and "-12RC" denote industrial and commercial variants respectively. The -12RC suffix specifically indicates the commercial grade (0°C to 70°C), but the underlying die supports full industrial range when packaged in appropriate variants.
Is AT27C800-12RC pin-compatible with other 44-lead SOIC EPROMs?
AT27C800-12RC follows JEDEC MO-142 standard SOIC-44 pinout and is functionally pin-compatible with AM27C800-12DC and MX27C800PC-12 in read mode, sharing identical A0–A18, O0–O15, CE, OE, VCC, GND, and BYTE/VPP assignments. However, NC pin locations differ slightly - verify layout against the SOIC pin diagram before PCB reuse.
How does the Integrated Product Identification Code work in AT27C800-12RC?
The AT27C800-12RC embeds a manufacturer ID (0x1E1E) and device code (0xF8F8) readable by asserting A9 = 12.0 V and toggling A0 between VIL and VIH while holding all other address lines low. This feature is electrically specified in the Product Identification section and enables programming tools to auto-detect the part without manual selection - reducing setup errors in high-volume production.
AT27C800-12RC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-SOIC (0.525", 13.34mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 8Mbit
- Memory Organization:
- 1M x 8, 512K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-SOIC
AT27C800-12RC FAQ
1.How can I place an order for AT27C800-12RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C800-12RC 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 AT27C800-12RC reliable?
The price and inventory of AT27C800-12RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C800-12RC is usually 5 days.
3.What payment methods are accepted for AT27C800-12RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C800-12RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C800-12RC?
AT27C800-12RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C800-12RC 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 AT27C800-12RC?
For technical support, including AT27C800-12RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C800-12RC requirements.
6.How does Aetrix verify that AT27C800-12RC is sourced from the original manufacturer or authorized distributors?
All AT27C800-12RC 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 AT27C800-12RC meets industry standards.
7.What is the process for return or replacement of AT27C800-12RC?
All AT27C800-12RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C800-12RC, 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 AT27C800-12RC part is unused and in its original packaging.
Return procedure for AT27C800-12RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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