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Microchip Technology AT27C1024-45PC
- Part No.:
- AT27C1024-45PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-45PC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,225
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Product details
Overview
AT27C1024-45PC 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, 2000V ESD protection, and operates across commercial temperature range (0°C to 70°C) in 40-lead PDIP package.
For engineers reviewing the AT27C1024-45PC datasheet, AT27C1024-45PC pinout, AT27C1024-45PC application, or AT27C1024-45PC equivalent, key selection criteria include verified 45 ns tACC timing, OTP firmware storage capability, VPP = 12.0 V programming voltage, CMOS/TTL compatibility, and JEDEC-standard 40P6 PDIP mechanical footprint.
Technical Context
The AT27C1024-45PC implements a high-density OTP EPROM architecture organized as 64K words × 16 bits, supporting direct upgrade from AT27C516 (512K). Its two-line enable scheme (CE and OE) enables precise output gating in high-speed bus environments without requiring WAIT states.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs/word pulse width, 13.0 V VPP programming voltage, and integrated product identification code accessible via A9/VH and A0 toggling-enabling automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling full firmware image storage for 16-bit MCUs without external memory expansion |
| Read Access Time (tACC) | 45 ns max - eliminates WAIT states in 22 MHz Z80 or 16 MHz 80286-based systems |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required in read mode |
| Active Current (ICC) | 30 mA max at 5 MHz - supports low-power embedded boot ROM applications with thermal margin |
| Standby Current (ISB) | 100 µA max (CMOS CE) - enables battery-backed retention in power-sensitive instrumentation |
| VPP Programming Voltage | 12.0 V ±0.5 V - requires dedicated programming supply; not derived from VCC |
| ESD Protection | 2000V HBM - meets industrial handling requirements without additional input protection circuitry |
Pinout & Package
AT27C1024-45PC is housed in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 2.54 mm lead pitch and through-hole mounting. Both GND pins (pins 12 and 28) must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on CE falling edge for random access to any 64K location |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus outputs; high-impedance when CE or OE is high |
| CE | Chip Enable | Primary device select; must be low for read or program operations; controls internal array activation |
| OE | Output Enable | Secondary output gate; allows shared bus operation by disabling outputs without deactivating chip |
| PGM | Program Strobe | Active-low pulse input that initiates 100 µs programming cycle when VPP = 12 V and CE = low |
| VPP | Programming Voltage | 12.0 V input required only during programming; must be applied after and removed before VCC per sequencing rules |
| VCC | Power Supply | 5V ±10% main supply; powers logic and output drivers; supplies 30 mA max during active read |
| GND | Ground | Two dedicated ground pins (12 and 28); both must be connected to minimize noise and ensure latchup immunity |
| NC | No Connect | Pin 23 is unconnected; must remain floating - no external tie or pull-up/pull-down |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time reduces production burn-in cycle duration by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F1h) readable via A9/VH + A0 toggle - enables auto-detection in universal programmers |
| Two-Line Control (CE/OE) | Independent chip and output enables allow glitch-free bus sharing in multi-device 16-bit data paths |
| CMOS/TTL Compatibility | Input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive (2.1 mA sink, –400 µA source) support mixed-logic system interfacing |
| High-Reliability Process | 200 mA latchup immunity and 2000V HBM ESD rating permit use in industrial control panels without external protection |
Applications
| Industrial PLC Firmware Storage | Legacy 16-Bit Microprocessor Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 45 ns instruction fetch latency to ARM7TDMI or Motorola 68020 derivatives. Use Value: Eliminates need for slow serial EEPROM or complex SRAM+backup battery schemes while meeting EN 61000-6-2 immunity requirements. |
Use Scenario: Hosting BIOS and peripheral initialization code in retro-computing hardware replicas and educational development platforms. IC Role / Device Role / Timing Role: Primary 16-bit wide instruction ROM mapped into upper memory space of Z8000 or NS32016 systems. Use Value: Enables cycle-accurate execution without WAIT insertion, preserving original system timing behavior and interrupt response predictability. |
| Automotive Instrument Cluster Calibration Data | Medical Device Configuration Memory |
Use Scenario: Holding calibrated sensor offsets and display lookup tables in analog/digital instrument clusters qualified for -40°C to 125°C operation. IC Role / Device Role / Timing Role: OTP configuration store accessed during cold start; immune to accidental overwrite during CAN bus activity. Use Value: Provides permanent, radiation-tolerant storage without risk of corruption from EMI or power transients common in vehicle electrical systems. |
Use Scenario: Storing FDA-approved device calibration constants and safety-critical operational parameters in Class II medical analyzers. IC Role / Device Role / Timing Role: Read-only configuration memory verified at power-on reset; isolated from user-accessible firmware partitions. Use Value: Meets IEC 62304 traceability requirements via integrated ID code and guaranteed write-once behavior - no software lock mechanism needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-45JI | Same die, industrial temp range (–40°C to +85°C), identical 45 ns timing and pinout | Required for extended-temperature industrial control or outdoor telecom equipment | Select when ambient operating temperature exceeds 70°C; otherwise AT27C1024-45PC suffices for commercial-grade designs |
| AM27C1024-45DC | AMD second-source version; same 40P6 PDIP package, 45 ns tACC, and 12 V VPP requirement | Used in legacy military/aerospace BOMs where AMD qualification is mandated | Choose only if existing design documentation specifies AMD part number; functionally interchangeable but distinct qualification history |
Compared with AT27C1024-45PC, the AT27C1024-45JI extends thermal reliability for harsh environments without altering timing or layout, while AM27C1024-45DC provides a drop-in qualified alternative for AMD-referenced legacy programs - neither changes PCB design or firmware interface.
Availability
AT27C1024-45PC is available at Aetrix Electronics and suitable for industrial control systems, legacy computing hardware restoration, and medical device calibration storage requiring stable component supply over extended production lifecycles.
Supply support for AT27C1024-45PC 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 non-volatile memory, microcontrollers, and secure authentication ICs for industrial and embedded markets.
The AT27C1024 belongs to Atmel's 27C-series OTP EPROM product line, designed specifically to replace UV-erasable EPROMs with faster, more reliable one-time programmable alternatives for firmware and configuration storage in cost-sensitive, high-volume applications.
FAQ
What is the maximum operating temperature range for the AT27C1024-45PC?
The AT27C1024-45PC is rated for commercial temperature operation from 0°C to +70°C. This range is explicitly defined in the Ordering Information table for the "-45PC" suffix, and applies to all DC and AC specifications including 45 ns access time and 30 mA active current. Operation outside this range may result in timing violations or increased standby leakage.
Does the AT27C1024-45PC require a UV eraser for reprogramming?
No, the AT27C1024-45PC is a one-time programmable (OTP) EPROM and cannot be erased or reprogrammed after initial programming. Unlike UV-erasable EPROMs, it lacks a quartz window and relies on permanent oxide breakdown during the 12 V VPP programming step. Once programmed, data is retained indefinitely without power.
Can the AT27C1024-45PC be used with a 3.3V microcontroller system?
The AT27C1024-45PC requires a 5V ±10% supply and is not 3.3V tolerant. Its inputs accept TTL/CMOS levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V), so 3.3V logic outputs may meet VIH but risk marginal noise margins. Level-shifting buffers are recommended for reliable interfacing, and VCC must remain at 5V - no internal regulator is present.
What is the purpose of the VPP pin on the AT27C1024-45PC?
The VPP pin on the AT27C1024-45PC supplies 12.0 V ±0.5 V exclusively during programming operations to enable Fowler-Nordheim tunneling for permanent bit programming. It is disconnected during normal read mode. Per datasheet sequencing rules, VPP must be applied after VCC and removed before VCC to prevent latchup or data corruption.
Is the AT27C1024-45PC pin-compatible with the AT27C516 EPROM?
Yes, the AT27C1024-45PC is a direct upgrade from the AT27C516 (512K × 8) in the same 40-lead PDIP package, sharing identical pinout, control signals (CE/OE/PGM), and VCC/VPP/GND assignments. However, its 64K × 16 organization requires wider data bus routing and updated address decoding for A15–A16 expansion.
AT27C1024-45PC 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:
- 45 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
AT27C1024-45PC FAQ
1.How can I place an order for AT27C1024-45PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-45PC 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 AT27C1024-45PC reliable?
The price and inventory of AT27C1024-45PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-45PC is usually 5 days.
3.What payment methods are accepted for AT27C1024-45PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-45PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-45PC?
AT27C1024-45PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-45PC 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 AT27C1024-45PC?
For technical support, including AT27C1024-45PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-45PC requirements.
6.How does Aetrix verify that AT27C1024-45PC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-45PC 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 AT27C1024-45PC meets industry standards.
7.What is the process for return or replacement of AT27C1024-45PC?
All AT27C1024-45PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-45PC, 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 AT27C1024-45PC part is unused and in its original packaging.
Return procedure for AT27C1024-45PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C1024-45PC Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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24LC01BT-I/SN
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