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Microchip Technology AT27C1024-70PU
- Part No.:
- AT27C1024-70PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-70PU.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,461
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Product details
Overview
AT27C1024-70PU from Atmel is a 1,048,576-bit (64K × 16) one-time programmable EPROM optimized for 16-/32-bit microprocessor systems. It delivers 70 ns read access time, operates on a single 5V ±10% supply, and consumes ≤100 µA in standby mode. Its dual-line control (CE/OE), CMOS/TTL compatibility, and industrial temperature range (-40°C to +85°C) make it suitable for firmware storage in embedded controllers and legacy industrial controllers.
For engineers reviewing the AT27C1024-70PU datasheet, AT27C1024-70PU pinout, AT27C1024-70PU application, or AT27C1024-70PU equivalent, key selection criteria include verified 70 ns tACC timing, PDIP-40 package mechanical fit, OTP reliability for unmodified firmware images, and compatibility with standard EPROM programmers supporting VPP = 12.0 V and rapid 100 µs/word programming.
Technical Context
The AT27C1024-70PU implements a parallel x16 memory architecture with two independent enable controls: CE (chip enable) and OE (output enable), enabling bus contention avoidance in high-speed systems. Its read cycle relies on address-valid-to-output-delay (tACC = 70 ns max) and output-enable-to-output-delay (tOE = 25 ns max), both specified under 5 MHz operation and 100 pF load.
Programming uses a rapid algorithm requiring VCC = 6.5 V and VPP = 13.0 V, with a 100 µs ±5% PGM pulse width and up to 10 reprogramming attempts per word. Product identification is accessed via A9 = 12.0 V and A0 toggling, returning fixed manufacturer (001Eh) and device code (00F1h) words.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 1,048,576-bit (64K × 16) OTP EPROM - supports full 16-bit data bus interface without byte-lane splitting |
| Read access time (tACC) | 70 ns max - eliminates WAIT states in 14 MHz CPU systems with adequate setup/hold margins |
| Supply voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Standby current (ISB1) | 100 µA max - enables low-power retention in battery-backed or intermittent-operation systems |
| Active current (ICC) | 30 mA max at 5 MHz - defines thermal budget for dense EPROM arrays on PCBs with local decoupling |
| Operating temperature | -40°C to +85°C - qualified for industrial control cabinets and factory-floor automation hardware |
| ESD protection | 2000 V HBM - reduces handling sensitivity during manual PCB assembly and field replacement |
Pinout & Package
AT27C1024-70PU is supplied in a 40-lead plastic dual-inline package (PDIP), 0.600" wide (JEDEC MS-011 AC), with 2.54 mm lead pitch. Both GND pins (pins 12 and 29) must be connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus interface; latched internally on CE/OE assertion for stable read access |
| O0–O15 | Data outputs | True x16 bidirectional data bus; high-impedance when CE or OE is inactive |
| CE | Chip enable | Primary device select; must be VIL before address valid to meet tCES ≥ 2 µs setup requirement |
| OE | Output enable | Secondary output gate; allows CE-controlled power-down while maintaining data bus isolation |
| PGM | Program strobe | Active-low programming trigger; requires 100 µs pulse width with VPP = 13.0 V for reliable bit-cell injection |
| VPP | Programming voltage | 12.0 ±0.5 V input during programming; must be applied simultaneously with or after VCC |
| NC | No connect | Pins 7, 19, 20, 31 - electrically isolated; no internal connection or bonding |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100 µs/word typical - reduces firmware burn time by >5× vs. legacy EPROMs; includes auto-retry up to 10 pulses per failed word |
| Integrated product ID code | Manufacturer ID = 001Eh, Device ID = 00F1h - enables automatic algorithm selection in production programmers without manual part lookup |
| Two-line control (CE/OE) | Independent chip and output enables - prevents bus contention during multi-device memory mapping and partial address decoding |
| CMOS/TTL-compatible I/O | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - interoperates with both 5V CMOS and legacy TTL microcontrollers and peripherals |
| Green (Pb/halide-free) packaging | Matte tin lead finish - complies with RoHS Directive 2011/65/EU and eliminates lead-based solder compatibility concerns |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
Use Scenario: Storing immutable boot code and safety-critical control logic in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Non-volatile firmware image repository with deterministic 70 ns read latency, directly mapped to CPU address space via A0–A15 and O0–O15. Use Value: Eliminates reliance on external flash or EEPROM; ensures zero-latency execution of startup routines and watchdog initialization sequences. | Use Scenario: Holding calibration tables and engine management firmware in pre-OBD-II automotive electronic control units where reprogramming is prohibited post-deployment. IC Role / Device Role / Timing Role: One-time-programmable read-only memory providing tamper-resistant, radiation-tolerant storage for critical engine parameters. Use Value: Guarantees firmware integrity over 15+ year service life; withstands 200 mA latchup immunity and -40°C cold-cranking transients. |
| Military Communications Baseband ROM | Medical Diagnostic Equipment BIOS |
Use Scenario: Hosting fixed signal processing firmware in secure radio transceivers operating in extended temperature environments. IC Role / Device Role / Timing Role: High-reliability OTP EPROM delivering 64K × 16 data width for real-time FFT and modulation lookup tables. Use Value: 2000 V HBM ESD rating protects against field-handling damage; industrial temp grade ensures stability across desert-to-arctic operational ranges. | Use Scenario: Storing certified boot firmware and hardware initialization routines in FDA-class II diagnostic imaging systems requiring traceable, unalterable code. IC Role / Device Role / Timing Role: Secure, non-modifiable BIOS memory mapped to reset vector address, powered only by main 5V rail. Use Value: Single-supply 5V operation simplifies power design; green packaging meets medical device environmental compliance mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-70PU | 512K × 8 organization; 40-pin PDIP; identical 70 ns tACC and 5V supply | Requires external byte-width multiplexing for 16-bit buses; lower density limits firmware complexity | Select when legacy 8-bit bus architecture or cost-sensitive lower-density storage is required |
| MX27C1024PC-70 | Same 64K × 16 organization and 70 ns speed; 40-pin PDIP; VPP = 12.5 V (vs. 12.0 V) | Minor VPP tolerance difference; pinout and timing otherwise identical; same industrial temp grade | Valid drop-in alternative if programmer supports 12.5 V VPP; verify PGM pulse width compatibility at 100 µs |
Compared with AT27C040-70PU and MX27C1024PC-70, the AT27C1024-70PU provides native x16 data width and guaranteed 12.0 V VPP compatibility, making it optimal for new 16-bit designs requiring minimal glue logic and maximum firmware footprint efficiency.
Availability
AT27C1024-70PU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot ROM, military communications baseband ROM, and medical diagnostic equipment BIOS requiring stable component supply across long-life product cycles.
Supply support for AT27C1024-70PU 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, designed high-reliability non-volatile memory and microcontroller solutions for industrial, automotive, and defense applications before its 2016 acquisition.
The AT27C1024 belongs to Atmel's OTP EPROM product line, engineered specifically for firmware storage in systems where code immutability, deterministic timing, and long-term data retention outweigh reprogrammability requirements.
FAQ
What is the maximum allowable VPP voltage during programming of the AT27C1024-70PU?
The AT27C1024-70PU specifies VPP = 12.0 ±0.5 V during programming, with absolute maximum rating of +14.0 V. Exceeding 12.5 V risks oxide breakdown in the floating-gate transistor array. The AT27C1024-70PU must have VPP applied simultaneously with or after VCC, and removed simultaneously with or before VCC, per datasheet Section 5.6.
Does the AT27C1024-70PU support read operations at 3.3V logic levels?
No, the AT27C1024-70PU requires a 5V ±10% supply and is not 3.3V tolerant. Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive (VOH ≥ 2.4 V at -400 µA) are specified for 5V CMOS/TTL systems. Interfacing with 3.3V microcontrollers requires level-shifting circuitry; the AT27C1024-70PU does not support mixed-voltage I/O.
Can the AT27C1024-70PU be used in place of the AT27C516 EPROM?
Yes - the AT27C1024-70PU is explicitly documented as a direct upgrade from the 512K AT27C516, offering double the density (1024K vs. 512K) in the same 40-pin PDIP package. Pinout, control signals (CE/OE/PGM), and programming methodology are identical, allowing reuse of existing socket layouts and programming fixtures without modification.
What decoupling capacitance is required for stable operation of the AT27C1024-70PU?
Per datasheet Section 3, each AT27C1024-70PU requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be placed near the power entry point. Failure to implement both violates the transient suppression requirements and may cause read corruption or premature wear.
Is the AT27C1024-70PU RoHS compliant?
Yes, the AT27C1024-70PU carries green (Pb/halide-free) packaging with matte tin lead finish, complying with EU RoHS Directive 2011/65/EU. This is confirmed in the Ordering Information table (Section 7) and Packaging Information (Section 8); no lead-based solder or halogenated flame retardants are used in the PDIP-40 package construction of the AT27C1024-70PU.
AT27C1024-70PU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C1024-70PU FAQ
1.How can I place an order for AT27C1024-70PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-70PU 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 AT27C1024-70PU reliable?
The price and inventory of AT27C1024-70PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-70PU is usually 5 days.
3.What payment methods are accepted for AT27C1024-70PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-70PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-70PU?
AT27C1024-70PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-70PU 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 AT27C1024-70PU?
For technical support, including AT27C1024-70PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-70PU requirements.
6.How does Aetrix verify that AT27C1024-70PU is sourced from the original manufacturer or authorized distributors?
All AT27C1024-70PU 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 AT27C1024-70PU meets industry standards.
7.What is the process for return or replacement of AT27C1024-70PU?
All AT27C1024-70PU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-70PU, 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 AT27C1024-70PU part is unused and in its original packaging.
Return procedure for AT27C1024-70PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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