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Microchip Technology AT27C1024-12PC
- Part No.:
- AT27C1024-12PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-12PC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,873
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Product details
Overview
AT27C1024-12PC from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM with 40-pin PDIP package, 120 ns read access time, 5V ±10% supply, and dual-line control (CE/OE). It serves as nonvolatile firmware storage in legacy 16-/32-bit microprocessor systems requiring reliable boot code retention without battery backup.
For engineers reviewing the AT27C1024-12PC datasheet, AT27C1024-12PC pinout, AT27C1024-12PC application, or AT27C1024-12PC equivalent, key selection criteria include OTP reliability, 120 ns read timing at industrial temperature range, CE/OE bus contention control, and compatibility with standard EPROM programmers supporting VPP = 13.0 V programming.
Technical Context
The AT27C1024-12PC implements a CMOS-based OTP memory array organized as 64K words × 16 bits, accessed via 16 address lines (A0–A15) and driven by two independent enable controls: Chip Enable (CE) for device selection and Output Enable (OE) for output gating. Its Rapid™ programming algorithm uses 100 µs/word pulses at VPP = 13.0 V and VCC = 6.5 V.
It features integrated product identification (A9 high-voltage decode for manufacturer/device codes), 2000V ESD protection, and latchup immunity of 200 mA. Read operation draws ≤30 mA active current and ≤100 µA standby current under TTL-level CE, with outputs fully CMOS/TTL compatible (VOH ≥ 2.4 V, VOL ≤ 0.4 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16) - supports full 16-bit data bus interface without byte-lane splitting |
| Read Access Time | 120 ns max - eliminates WAIT states in 8 MHz Z80 or 10 MHz 80286 systems |
| Supply Voltage | 5V ±10% - operates directly from standard logic rail; no auxiliary voltage required for read mode |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated EPROM programmer with high-voltage capability |
| Standby Current | ≤100 µA (TTL CE) - enables low-power hold state in battery-backed or portable embedded controllers |
| Output Drive | IOH = −400 µA, IOL = 2.1 mA - drives standard TTL loads and 100 pF bus capacitance reliably |
| Operating Range | −40°C to +85°C - qualified for industrial-grade control panels and motor drive firmware storage |
Pinout & Package
AT27C1024-12PC is housed in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 2×20 pin layout and pin 1 index marker. Both GND pins (pins 12 and 29) must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on CE assertion for memory location selection |
| O0–O15 | Data Outputs | True 16-bit bidirectional data path; high-impedance when OE or CE inactive |
| CE | Chip Enable | Primary device select; places outputs in high-Z when high, enabling multi-chip memory decoding |
| OE | Output Enable | Secondary output gate; allows CE-controlled chip selection while enabling/disabling data bus drivers |
| PGM | Program Strobe | Active-low pulse input triggering 100 µs programming cycle at VPP = 13.0 V |
| VPP | Programming Supply | 13.0 V input during programming only; must be applied after and removed before VCC per sequencing rules |
| VCC | Power Supply | +5 V main supply; powers logic and memory array in read/standby; supplies 6.5 V during programming |
| GND | Ground | Two dedicated ground pins (12, 29); both required to minimize noise and ensure timing compliance |
| NC | No Connect | Pin 22 is unconnected; must remain floating - not tied to VCC, GND, or other signals |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 100 µs/word typical programming time - reduces firmware update cycles in production programming stations |
| Integrated ID Code | Manufacturer (001Eh) and device (00F1h) identification via A9 high-voltage decode - enables auto-algorithm selection in universal programmers |
| Dual-Line Control | Independent CE and OE inputs - prevents bus contention in shared-memory systems with multiple peripherals |
| High-Reliability CMOS | 2000V HBM ESD rating and 200 mA latchup immunity - ensures robustness in factory-floor handling and industrial PCB environments |
| JEDEC Standard Packages | PDIP (40P6), PLCC (44J), VSOP (40V) - supports drop-in replacement across legacy board designs without footprint redesign |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
Use Scenario: Fixed-function programmable logic controller storing ladder logic and I/O mapping tables in nonvolatile memory. IC Role / Device Role / Timing Role: Primary boot-time firmware ROM providing deterministic 120 ns instruction fetch latency to 80C186 CPU. Use Value: Eliminates need for external wait-state generators; supports real-time scan-cycle execution without memory arbitration delays. | Use Scenario: Standalone medical instrument (e.g., infusion pump controller) requiring certified, unalterable startup code. IC Role / Device Role / Timing Role: One-time programmable boot ROM holding safety-critical initialization routines and calibration constants. Use Value: Prevents field corruption or accidental reprogramming; meets IEC 62304 Class B software requirements for immutable firmware. |
| Automotive Engine Control Unit (ECU) | Test Equipment Microcode Storage |
Use Scenario: Early-generation engine management system storing fuel map lookup tables and spark timing curves. IC Role / Device Role / Timing Role: OTP EPROM holding calibrated sensor response curves and actuator control algorithms. Use Value: Withstands −40°C to +125°C automotive ambient; immune to power-loss-induced bit flips during cranking events. | Use Scenario: Automated test fixture storing pattern generation microcode and pass/fail decision logic. IC Role / Device Role / Timing Role: Nonvolatile microinstruction store for custom ASIC test sequencers. Use Value: Enables field-upgradable test scripts via EPROM burner; avoids FPGA reconfiguration overhead and licensing costs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-12JI | Same die, 40-pin PDIP package, but rated for −40°C to +85°C industrial range (vs. AT27C1024-12PC's 0°C to +70°C commercial range) | Required where extended temperature stability is mandated, e.g., outdoor industrial enclosures or factory automation cabinets | Select AT27C1024-12JI if operating ambient exceeds 70°C or requires industrial qualification traceability |
| AT27C1024-12PA | Same die, 40-pin PDIP package, qualified for −40°C to +125°C automotive grade with AEC-Q100 stress testing | Mandatory for under-hood automotive modules; includes enhanced screening, lot traceability, and failure reporting per AIAG standards | Choose AT27C1024-12PA only when automotive OEM compliance (e.g., Ford WDC 1025, GM 1927551) is contractually required |
Compared with AT27C1024-12PC, the AT27C1024-12JI extends thermal margin for industrial control without changing PCB layout, while AT27C1024-12PA adds automotive qualification overhead and cost - neither offers pin-compatible upgrades to newer Flash or EEPROM technologies.
Availability
AT27C1024-12PC is available at Aetrix Electronics and suitable for industrial control panels, legacy embedded boot systems, and test equipment requiring stable component supply with long-term obsolescence mitigation.
Supply support for AT27C1024-12PC 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.
The AT27C1024 product line delivers high-reliability OTP EPROMs for firmware storage in mission-critical industrial and automotive systems where data integrity and program permanence are mandatory.
FAQ
What is the maximum read access time specified for AT27C1024-12PC?
The AT27C1024-12PC has a maximum read access time of 120 ns under commercial temperature conditions (0°C to +70°C), measured from address valid or CE/OE assertion to valid data on O0–O15. This value is guaranteed across all operating voltages (4.5 V to 5.5 V) and load conditions (100 pF, 2.1 mA sink), making it suitable for systems with tight timing budgets such as 80286-based controllers.
Can AT27C1024-12PC be programmed using standard EPROM programmers?
Yes, AT27C1024-12PC is compatible with industry-standard EPROM programmers that support 13.0 V VPP programming, 100 µs PGM pulse width, and the Rapid™ algorithm. It requires proper sequencing: VCC must be applied before VPP and removed after VPP. The integrated product ID (001Eh/00F1h) allows auto-detection in intelligent programmers like Data I/O PS-3000 or BP Microsystems 3000 series.
Does AT27C1024-12PC require external decoupling capacitors?
Yes, AT27C1024-12PC requires a 0.1 µF ceramic capacitor between VCC and GND, placed as close as possible to pins 21 and 12/29. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These capacitors suppress transient excursions during CE switching and ensure stable 120 ns timing margins per the Atmel design guidelines.
What is the function of the NC pin on AT27C1024-12PC?
Pin 22 on AT27C1024-12PC is designated NC (No Connect) and must remain unconnected - it is not internally bonded and carries no electrical function. Tying it to VCC, GND, or any signal violates the datasheet and may cause unpredictable behavior or increased leakage. This pin position corresponds to pin 22 in the 40P6 PDIP mechanical outline (JEDEC MS-011 AC).
Is AT27C1024-12PC compatible with 3.3 V systems?
No, AT27C1024-12PC is strictly a 5V-only device: its DC specifications (VIH = 2.0 V min, VIL = 0.8 V max), AC timing (120 ns @ 5V), and programming requirements (VPP = 13.0 V, VCC = 6.5 V during programming) are defined exclusively for 5V ±10% operation. Interfacing with 3.3 V logic requires level-shifting buffers; direct connection risks undervoltage lockout or timing violations.
AT27C1024-12PC 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:
- 120 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
AT27C1024-12PC FAQ
1.How can I place an order for AT27C1024-12PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-12PC 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 AT27C1024-12PC reliable?
The price and inventory of AT27C1024-12PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-12PC is usually 5 days.
3.What payment methods are accepted for AT27C1024-12PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-12PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-12PC?
AT27C1024-12PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-12PC 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 AT27C1024-12PC?
For technical support, including AT27C1024-12PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-12PC requirements.
6.How does Aetrix verify that AT27C1024-12PC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-12PC 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 AT27C1024-12PC meets industry standards.
7.What is the process for return or replacement of AT27C1024-12PC?
All AT27C1024-12PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-12PC, 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 AT27C1024-12PC part is unused and in its original packaging.
Return procedure for AT27C1024-12PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C1024-12PC Tags
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AT24C02C-XHM-T
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AT24CS02-SSHM-T
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