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Microchip Technology AT27C800-12PC
- Part No.:
- AT27C800-12PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 42-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C800-12PC.pdf
- Description:
- IC EPROM 8MBIT PARALLEL 42DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
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Product details
Overview
AT27C800-12PC from Atmel is a one-time programmable (OTP) EPROM with 8,388,608-bit capacity organized as 512K × 16 or 1024K × 8, 5V ±10% supply, 120 ns read access time, and dual-mode byte/word configuration via BYTE/VPP pin - used for firmware storage in 16-/32-bit microprocessor systems requiring nonvolatile, low-latency code execution.
For engineers reviewing the AT27C800-12PC datasheet, AT27C800-12PC pinout, AT27C800-12PC application, or AT27C800-12PC equivalent, key selection considerations include JEDEC-standard PDIP-42 packaging, CMOS/TTL compatibility, Rapid™ programming at 50 µs/word, standby current ≤100 µA, and UV-erasable alternative availability.
Technical Context
The AT27C800-12PC implements two-line control (CE/OE) for bus contention avoidance in high-speed systems and supports configurable x16/x8 organization through the BYTE/VPP pin: VIH enables word-wide mode with O15/A-1 as data output; VIL enables byte-wide mode with O15/A-1 repurposed as address A-1.
It uses high-reliability CMOS technology with 2,000 V ESD protection and 200 mA latch-up immunity, operates across commercial temperature range (0°C to 70°C), and requires no external WAIT states due to guaranteed 120 ns tACC timing under 5 MHz conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8,388,608 bits (512K × 16 or 1024K × 8) - supports flexible firmware mapping for 16-bit and 8-bit data buses. |
| Read Access Time | 120 ns max - eliminates WAIT states in 5 MHz microprocessor systems. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead. |
| Standby Current | ≤100 µA - enables low-power retention in battery-backed or intermittent operation modes. |
| Active Current | ≤50 mA at 5 MHz - defines thermal and power delivery requirements for sustained read bursts. |
| Programming Speed | 50 µs/word typical (Rapid™ algorithm) - reduces production programming cycle time significantly vs. legacy EPROMs. |
| ESD Protection | 2,000 V HBM - ensures robustness during handling and board assembly without special ESD controls. |
Pinout & Package
AT27C800-12PC is supplied in 42-pin, 0.600" wide plastic dual in-line package (PDIP), compliant with JEDEC MS-011. Pin 1 is marked by notch or dot; pin count includes 2 GND, 1 VCC, 19 address inputs (A0–A18), 16 data I/Os (O0–O15), 2 controls (CE, OE), 1 multifunction pin (BYTE/VPP), 1 bidirectional pin (O15/A-1), and 4 NC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word or 1024K-byte addressing space. |
| O0–O15 | Data Outputs (x16) | 16-bit parallel data bus; in byte mode, O0–O7 active for lower byte, O8–O14 + O15/A-1 for upper byte. |
| O15/A-1 | Configurable Terminal | Functions as O15 output in word mode; becomes A-1 address input in byte mode to select upper/lower byte. |
| BYTE/VPP | Mode Select / Program Supply | VIH = word mode; VIL = byte mode; during programming, driven to 13.0 V for OTP write. |
| CE | Chip Enable | Active-low enable controlling device selection on shared data/address buses. |
| OE | Output Enable | Active-low control enabling output drivers independently of CE for bus sharing. |
| GND (Pins 12, 27) | Ground Reference | Dual ground pins reduce ground bounce and improve noise margin in high-speed reads. |
| VCC (Pin 25) | Power Supply | Single 5V supply powers core logic and I/O; decoupling requires 0.1 µF ceramic + 4.7 µF bulk capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Word/Byte Configurability | Runtime-selectable organization via BYTE/VPP pin - avoids hardware redesign when switching between 8-bit and 16-bit system buses. |
| Rapid™ Programming | 50 µs/word typical - cuts programming time by >5× vs. conventional EPROM algorithms, improving manufacturing throughput. |
| Integrated ID Code | Manufacturer (0x1E1E) and device code (0xF8F8) readable via A9 high-voltage protocol - enables automated programmer validation and BOM traceability. |
| Two-Line Control (CE/OE) | Independent chip and output enables - prevents bus contention during partial memory accesses and multi-device arbitration. |
| JEDEC Standard Packages | PDIP-42, PLCC-44, SOIC-44, TSOP-48 - ensures drop-in replacement capability across legacy and space-constrained designs. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 120 ns instruction fetch timing for real-time scan cycles. Use Value: Eliminates disk-based boot delays and supports field firmware updates via UV erasure and reprogramming. |
Use Scenario: Hosting BIOS or bootloader code in legacy 80x86 or 68k-based embedded systems where flash density was insufficient. IC Role / Device Role / Timing Role: x16 EPROM serving as primary code memory with direct CPU bus interface and no wait-state insertion. Use Value: Enables reliable, radiation-tolerant firmware storage without wear-out concerns inherent in early flash technologies. |
| Automotive Instrument Cluster Memory | Medical Device Calibration Data |
|
Use Scenario: Holding gauge graphics, CAN message lookup tables, and calibration constants in automotive dashboards certified to AEC-Q100 Class 2. IC Role / Device Role / Timing Role: OTP EPROM storing immutable safety-critical display assets accessed during cold boot sequence. Use Value: Guarantees data integrity over 15+ year vehicle lifetimes without risk of bit corruption from power cycling. |
Use Scenario: Retaining sensor offset/gain coefficients and FDA-mandated device identification codes in Class II medical electronics. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory holding calibrated parameters read once per power-on reset. Use Value: Meets IEC 62304 traceability requirements via integrated manufacturer/device ID codes readable in-system. |
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 512K×16 organization, 120 ns speed, but uses AMD's proprietary programming algorithm and lacks integrated ID code. | Requires different programming voltage sequencing (VPP = 12.5 V) and verification flow; no A9-based ID readback support. | Choose when existing AMD toolchain is in place and ID traceability is not required. |
| MX27C800-12PC | Pin-compatible PDIP-42 OTP EPROM with identical AC/DC specs, but rated only for commercial temp (0°C–70°C) and no industrial variant. | Lacks -40°C to +85°C qualification; unsuitable for extended-temperature industrial or automotive deployments. | Acceptable for cost-sensitive commercial equipment where ambient temperature remains controlled. |
Compared with AM27C800-12DC and MX27C800-12PC, the AT27C800-12PC offers unique integrated product identification for automated programming validation and broader industrial temperature support, making it preferable for traceable, high-reliability firmware storage where long-term data retention and process control are critical.
Availability
AT27C800-12PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM, automotive instrument cluster memory, and medical device calibration data applications requiring stable component supply and long-lifecycle support.
Supply support for AT27C800-12PC 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 secure authentication ICs for industrial, automotive, and consumer markets.
The AT27C800 product line delivers high-density, low-power OTP EPROMs optimized for firmware storage in microprocessor-based systems where reliability, fast access, and JEDEC package compatibility are essential.
FAQ
What is the maximum operating temperature range for the AT27C800-12PC?
The AT27C800-12PC is specified for commercial temperature operation from 0°C to +70°C. It is not qualified for industrial (-40°C to +85°C) use - that capability is reserved for variants ending in "-12PI" or "-12TI". The "PC" suffix explicitly denotes the plastic DIP package with commercial-grade thermal rating, and this limit is enforced by JEDEC test conditions in the datasheet's DC and AC operating characteristics table.
Does the AT27C800-12PC support both 8-bit and 16-bit data bus interfaces?
Yes, the AT27C800-12PC supports both configurations via the BYTE/VPP pin: when driven high, it operates in 16-bit word mode with O0–O15 active; when driven low, it switches to 8-bit byte mode where O0–O7 carry the lower byte and O8–O14 plus O15/A-1 carry the upper byte. This dual-mode capability is confirmed in the device description and operating modes table, enabling reuse across 8-bit and 16-bit microprocessor platforms without hardware changes.
What programming voltage is required for the AT27C800-12PC?
The AT27C800-12PC 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 is documented in the DC Programming Characteristics table and reinforced in the Rapid Programming Algorithm section. Applying 5 V to BYTE/VPP enables read mode only; programming will fail if VPP remains at 5 V or deviates beyond the ±0.25 V tolerance band.
Is the AT27C800-12PC pin-compatible with other 42-pin PDIP EPROMs like the 27C800 family?
Yes, the AT27C800-12PC follows JEDEC MS-011 outline for 42-pin PDIP and shares identical pinout with industry-standard 27C800-series OTP EPROMs including address (A0–A18), data (O0–O15), control (CE, OE), and power (VCC, GND) assignments. Pin 1 location, spacing, and functional mapping match datasheet figures for PDIP top view, enabling mechanical and electrical interchangeability in existing sockets designed for 27C800-class devices.
How does the Integrated Product Identification Code work on the AT27C800-12PC?
The AT27C800-12PC embeds a Manufacturer ID (0x1E1E) and Device Code (0xF8F8) readable by applying 12.0 V ± 0.5 V to A9 while holding A1–A18 low and toggling A0 - a method defined in the Product Identification section. This electronic ID allows programmers to auto-detect the part and select correct algorithms, eliminating manual part selection errors and ensuring traceability in high-volume manufacturing environments.
AT27C800-12PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 42-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 42-PDIP
AT27C800-12PC FAQ
1.How can I place an order for AT27C800-12PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C800-12PC 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 AT27C800-12PC reliable?
The price and inventory of AT27C800-12PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C800-12PC is usually 5 days.
3.What payment methods are accepted for AT27C800-12PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C800-12PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C800-12PC?
AT27C800-12PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C800-12PC 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 AT27C800-12PC?
For technical support, including AT27C800-12PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C800-12PC requirements.
6.How does Aetrix verify that AT27C800-12PC is sourced from the original manufacturer or authorized distributors?
All AT27C800-12PC 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 AT27C800-12PC meets industry standards.
7.What is the process for return or replacement of AT27C800-12PC?
All AT27C800-12PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C800-12PC, 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 AT27C800-12PC part is unused and in its original packaging.
Return procedure for AT27C800-12PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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