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Microchip Technology AT27C1024-70PC
- Part No.:
- AT27C1024-70PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-70PC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
AT27C1024-70PC from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM with 45 ns read access time, 5V ±10% supply operation, and dual-line control (CE/OE) for bus contention avoidance in 16-/32-bit microprocessor systems. It features Rapid™ programming at 100 µs/word and integrated product identification code for automated programming equipment.
For engineers reviewing the AT27C1024-70PC datasheet, AT27C1024-70PC pinout, AT27C1024-70PC application, or AT27C1024-70PC equivalent, key selection criteria include OTP reliability, 40-pin PDIP compatibility, 70 ns speed grade timing, and VPP = 13.0 V programming voltage compliance.
Technical Context
The AT27C1024-70PC implements a CMOS-based OTP memory architecture with address decoding for A0–A15 and 16-bit bidirectional data outputs O0–O15. Its two-line enable logic (CE active-low, OE active-low) supports high-speed read cycles without WAIT states and ensures output high-impedance during standby or disable modes.
Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a 100 µs PGM pulse width and verification loop per word. Product identification uses A9 = 12.0 V and A0 toggling to select manufacturer/device codes - a feature used by industry-standard programmers to auto-configure algorithms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling firmware storage for 16-bit embedded controllers without external buffering |
| Read Access Time | 70 ns max (tACC), ensuring compatibility with 14 MHz bus clocks in legacy microprocessor designs |
| Supply Voltage | 5 V ±10%, eliminating need for auxiliary voltage rails in standard TTL/CMOS systems |
| Standby Current | 100 µA max (ISB1), supporting low-power hold states in battery-backed or intermittent-read applications |
| Programming Voltage | VPP = 13.0 V ±0.25 V, requiring dedicated programming hardware but guaranteeing reliable oxide breakdown for OTP cells |
| Operating Temperature | 0°C to 70°C (Commercial), validated for use in office, lab, and non-harsh industrial environments |
| ESD Protection | 2000 V HBM, reducing risk of handling damage during manual PCB assembly or rework |
Pinout & Package
AT27C1024-70PC is packaged in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 2×20 pin layout and dual GND pins (pins 11 and 28) requiring connection for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; all must be driven to select one of 64K words |
| O0–O15 | Data Outputs | 16-bit parallel data bus; high-impedance when CE or OE is inactive |
| CE | Chip Enable | Active-low global enable; controls device power state and output driver activation |
| OE | Output Enable | Active-low output gate; allows shared bus operation without contention when CE is asserted |
| PGM | Program Strobe | Active-low pulse input triggering 100 µs programming cycle under VPP = 13 V |
| VPP | Programming Supply | 13 V programming voltage input; must be applied after VCC and removed before VCC |
| VCC | Power Supply | +5 V main supply; powers logic and output drivers during read and program modes |
| GND | Ground | Two dedicated ground pins (11, 28); both must be connected to minimize noise and ensure timing compliance |
| NC | No Connect | Pin 22 is unconnected; must remain floating or tied to GND per board layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time with built-in verify-reprogram loop, reducing production burn-in time vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer (001Eh) and device (00F1h) identification via A9/A0 control, enabling automatic algorithm selection in universal programmers |
| Two-Line Control Architecture | Independent CE and OE enables precise bus arbitration in multi-device systems, eliminating need for external bus transceivers |
| CMOS/TTL I/O Compatibility | Input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive (2.1 mA sink, –400 µA source) support direct interfacing with 5 V logic families |
| High-Reliability Process | 200 mA latchup immunity and 2000 V ESD protection ensure robustness in manual handling and noisy industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy Microprocessor Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 70 ns read access to initialization code for 80C186-class CPUs. Use Value: Eliminates reliance on slow serial EEPROM or volatile RAM + battery backup, improving cold-start reliability and reducing BOM count. | Use Scenario: Holding BIOS or monitor firmware in vintage 16-bit development systems such as IBM PC/AT clones or embedded test rigs. IC Role / Device Role / Timing Role: Primary read-only instruction store mapped to upper memory space (e.g., F0000h–FFFFFh) with CE/OE decoding. Use Value: Enables zero-WAIT-state execution at 14 MHz bus speeds due to guaranteed 70 ns tACC, preserving system performance without glue logic. |
| Military Avionics Configuration Memory | Automated Test Equipment (ATE) Pattern ROM |
Use Scenario: Storing calibration constants and flight-critical configuration parameters in airborne mission computers where field updates are prohibited. IC Role / Device Role / Timing Role: One-time programmable configuration store accessed during power-on self-test (POST) with strict read-only enforcement. Use Value: Provides tamper-resistant, radiation-tolerant storage (via CMOS process) without risk of accidental overwrite - critical for DO-254 compliance. | Use Scenario: Hosting fixed digital stimulus/response patterns in benchtop ATE systems performing IC functional testing. IC Role / Device Role / Timing Role: High-speed pattern sequencer memory delivering synchronized 16-bit vectors to DUT interface logic. Use Value: Sustains 14 MHz vector rate using 70 ns tACC and dual-enable bus control, enabling sub-microsecond pattern transitions without FIFO buffering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-70JI | Same die, industrial temperature range (–40°C to +85°C), PLCC package (44J) | Required for extended-temperature deployments; not drop-in due to different package and pinout | Select when operating ambient exceeds 70°C or board uses surface-mount footprint |
| AM27C1024-70DC | AMD second-source part; identical 40-pin PDIP pinout and AC/DC specs, but lacks integrated ID code | Compatible in read mode; programming requires manual algorithm selection instead of auto-ID | Choose for cost-sensitive volume builds where programmer flexibility is available |
Compared with AT27C1024-70PC, the AT27C1024-70JI offers wider thermal tolerance at the cost of non-interchangeable packaging, while AM27C1024-70DC provides pin-compatible replacement without ID-code automation - making AT27C1024-70PC optimal for new designs requiring plug-and-play programming and commercial-temperature stability.
Availability
AT27C1024-70PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microprocessor boot ROM, military avionics configuration memory, and automated test equipment pattern ROM requiring stable component supply across long-lifecycle programs.
Supply support for AT27C1024-70PC 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 was a U.S.-based semiconductor company specializing in microcontrollers, non-volatile memory, and programmable logic, later acquired by Microchip Technology in 2016.
The AT27C1024 belongs to Atmel's 27C-series OTP EPROM family, designed specifically for high-reliability, medium-density firmware storage in 16-/32-bit embedded systems where field reprogramming is unnecessary but deterministic timing and long-term data retention are essential.
FAQ
What is the maximum allowed VPP voltage for programming the AT27C1024-70PC?
The AT27C1024-70PC requires VPP = 13.0 V ±0.25 V during programming, with absolute maximum rating of +14.0 V. Exceeding 13.25 V risks over-stressing the oxide layer and may cause premature cell failure or inconsistent programming. The AT27C1024-70PC datasheet specifies VID (A9 identification voltage) at 11.5–12.5 V, confirming tight regulation is mandatory for both programming and ID code access.
Can the AT27C1024-70PC operate with a 3.3 V supply?
No, the AT27C1024-70PC is specified only for 5 V ±10% operation (4.5 V to 5.5 V). Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), output drive strength, and internal charge pumps are designed for 5 V logic levels. Using 3.3 V will result in undefined behavior, failed reads, and inability to enter programming mode - the AT27C1024-70PC does not support mixed-voltage or level-shifted interfaces.
Does the AT27C1024-70PC support byte-wide access?
No, the AT27C1024-70PC is strictly organized as 64K × 16 bits and provides only 16-bit parallel outputs (O0–O15). It has no byte-enable or upper/lower word select functionality. To interface with 8-bit buses, external logic (e.g., octal latches or bus transceivers) must be used to mask or route half the data bus - the AT27C1024-70PC itself does not decode or gate individual bytes.
What decoupling capacitors are required for stable operation of the AT27C1024-70PC?
The AT27C1024-70PC requires a 0.1 µF ceramic capacitor between VCC and GND, placed as close as possible to pins 20 and 11/28. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point. These values are mandated in the AT27C1024-70PC datasheet to suppress transient excursions during CE switching and ensure ICC/ISB spec compliance.
Is the AT27C1024-70PC pin-compatible with the AT27C516 EPROM?
Yes - the AT27C1024-70PC is a direct upgrade from the AT27C516 (512K × 8), sharing identical 40-pin PDIP pinout, signal naming, and control protocol. However, the AT27C1024-70PC doubles density (1 Mbit vs. 512 Kbit) and changes organization to ×16, requiring software-level adaptation for 16-bit data width and updated address mapping.
AT27C1024-70PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-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:
- 1Mbit
- Memory Organization:
- 64K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C1024-70PC FAQ
1.How can I place an order for AT27C1024-70PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-70PC 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 AT27C1024-70PC reliable?
The price and inventory of AT27C1024-70PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-70PC is usually 5 days.
3.What payment methods are accepted for AT27C1024-70PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-70PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-70PC?
AT27C1024-70PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-70PC 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 AT27C1024-70PC?
For technical support, including AT27C1024-70PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-70PC requirements.
6.How does Aetrix verify that AT27C1024-70PC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-70PC 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 AT27C1024-70PC meets industry standards.
7.What is the process for return or replacement of AT27C1024-70PC?
All AT27C1024-70PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-70PC, 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 AT27C1024-70PC part is unused and in its original packaging.
Return procedure for AT27C1024-70PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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