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Microchip Technology AT27C1024-70JI
- Part No.:
- AT27C1024-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-70JI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
AT27C1024-70JI from Microchip Technology (formerly Atmel) is a 1-Mbit one-time programmable EPROM organized as 64K × 16 bits, operating at 5V ±10%, with 70 ns read access time and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), rapid programming (100 µs/word), and integrated product identification code for automated programming equipment. Used in firmware storage for 16-/32-bit microprocessor systems requiring nonvolatile, pin-compatible legacy memory replacement.
For engineers reviewing the AT27C1024-70JI datasheet, AT27C1024-70JI pinout, AT27C1024-70JI application, or AT27C1024-70JI equivalent, key selection criteria include 40-pin PDIP package compatibility, 5V-only read operation, standby current ≤100 µA, and support for JEDEC-standard programming algorithms with VPP = 12.0 V during programming.
Technical Context
The AT27C1024-70JI implements a CMOS OTP EPROM architecture with address decoding for A0–A15, 16-bit bidirectional data outputs (O0–O15), and two independent enable controls (CE and OE) to prevent bus contention. Its Rapid™ programming algorithm uses precise 100 µs PGM pulses at VCC = 6.5 V and VPP = 13.0 V, with verification loops per word.
It supports product identification via A9 high-voltage sensing (11.5–12.5 V) and A0 toggling to select manufacturer ID (001Eh) or device code (00F1h). All GND pins must be connected, and decoupling requires both 0.1 µF ceramic (per device) and 4.7 µF bulk capacitors on VCC–GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling full firmware image storage for mid-complexity embedded controllers. |
| Read Access Time | 70 ns max - eliminates WAIT states in 5 MHz bus systems and supports direct interface to 80C188/186 and similar MCUs. |
| Supply Voltage | 5 V ±10% - single-rail operation compatible with legacy TTL/CMOS logic without level shifters. |
| Standby Current | ≤100 µA (CMOS CE input) - enables low-power hold mode in battery-backed or energy-sensitive systems. |
| Programming Voltage | VPP = 12.0 ±0.5 V - requires dedicated programming supply; not used during normal read operation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and PLC I/O modules. |
| ESD Protection | 2000 V HBM - ensures robustness during board handling and in-circuit programming. |
Pinout & Package
AT27C1024-70JI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant. Pin 1 is marked by a notch or dot; both GND pins (pins 11 and 28) 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 to select one of 64K words. |
| O0–O15 | Data Outputs | True TTL/CMOS-compatible 16-bit data bus; high-impedance when OE or CE is inactive. |
| CE | Chip Enable | Active-low global chip select; enables internal circuitry and output drivers only when asserted. |
| OE | Output Enable | Active-low output gate; allows shared bus operation without disabling CE or changing address. |
| PGM | Program Strobe | Active-low pulse input (100 µs width) that initiates programming of the addressed word under VPP bias. |
| VPP | Programming Supply | 12.0 V input required only during programming; must be applied after and removed before VCC. |
| NC | No Connect | Pin 22 is unconnected; must remain floating - no external tie or pull-up/down. |
| VCC / GND | Power / Ground | Single 5 V supply; dual GND pins (11, 28) reduce ground bounce and improve noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time with auto-verify loop - reduces production programming cycle time by >5× vs. legacy EPROMs. |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F1h) readable via A9/A0 voltage sequencing - enables automatic algorithm selection in universal programmers. |
| Two-Line Output Control (CE + OE) | Independent chip and output enables eliminate bus contention in multi-device systems - simplifies timing design for shared data buses. |
| JEDEC-Standard Packages | 40-lead PDIP (40P6) footprint matches legacy 27C512/27C010 layouts - allows drop-in upgrade without PCB redesign. |
| High-Reliability Process | 200 mA latchup immunity and 2000 V HBM ESD rating - suitable for factory programming and field-replaceable modules. |
Applications
| Industrial PLC Firmware Storage | Legacy MCU Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in modular programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware source accessed directly by 80C186 CPU over 16-bit data bus; 70 ns access satisfies 5 MHz bus timing. Use Value: Eliminates need for external wait-state generators; industrial temp rating ensures reliability across ambient swings in unconditioned control panels. | Use Scenario: Providing immutable startup code and hardware initialization routines for vintage 16-bit microcontrollers in test equipment and medical analyzers. IC Role / Device Role / Timing Role: Primary boot ROM mapped at reset vector; CE/OE dual control enables clean bus arbitration with RAM and peripherals. Use Value: Direct 5 V compatibility avoids level-shifting components; OTP nature prevents accidental corruption during service or calibration. |
| Automated Test Equipment (ATE) Pattern Memory | Avionics Configuration PROM |
Use Scenario: Holding digital stimulus/response patterns in boundary-scan testers where firmware rarely changes but must survive power cycles. IC Role / Device Role / Timing Role: Static pattern store accessed sequentially by pattern generator logic; rapid read enables high-throughput test sequences. Use Value: 64K × 16 capacity supports >1M test vectors; low standby current (<100 µA) extends uptime in battery-buffered ATE racks. | Use Scenario: Storing flight-critical configuration parameters (e.g., sensor calibrations, actuator limits) in airborne control units certified to DO-254 Level B. IC Role / Device Role / Timing Role: Immutable configuration PROM read once at power-on reset; accessed via discrete address decoder, not memory-mapped bus. Use Value: OTP guarantee prevents runtime tampering; industrial-grade packaging meets vibration and thermal shock requirements per RTCA/DO-160. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C010-70PI | 512 Kbit (64K × 8), same 40-pin PDIP, identical timing and programming specs except data width. | Supports 8-bit microcontrollers (e.g., 8051) only; insufficient for 16-bit data path systems. | Select only if system bus is 8-bit and firmware size ≤512 Kbit. |
| AM27C1024-70DC | Same 1-Mbit (64K × 16) organization, 70 ns speed, but manufactured by AMD (now discontinued); pinout and AC specs match AT27C1024-70JI. | Identical functional behavior and PCB layout - verified as second-source replacement in legacy designs. | Valid for existing AM27C1024-based boards; verify VPP tolerance (12.0 V ±0.5 V) matches programming hardware. |
Compared with AT27C1024-70JI, AT27C010-70PI halves data width and capacity, limiting use to 8-bit systems, while AM27C1024-70DC offers identical functionality and drop-in compatibility but requires sourcing from legacy inventory channels.
Availability
AT27C1024-70JI is available at Aetrix Electronics and suitable for industrial control, legacy MCU boot, and automated test equipment applications requiring stable component supply, long-term lifecycle support, and JEDEC-standard OTP EPROM compatibility.
Supply support for AT27C1024-70JI 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
Microchip Technology acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT27C series OTP EPROMs.
The AT27C1024 belongs to Atmel's legacy parallel EPROM product line, designed specifically for firmware storage in 16-/32-bit microprocessor systems where nonvolatile, pin-compatible, and program-once reliability are mandatory.
FAQ
What is the correct power-up sequence for AT27C1024-70JI during programming?
VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP. During programming, VCC = 6.5 V ±0.25 V and VPP = 13.0 V ±0.25 V are required. Failure to follow this sequence risks exceeding absolute maximum ratings and may cause permanent damage to the AT27C1024-70JI.
Can AT27C1024-70JI operate from a single 5 V supply in all modes?
Yes - AT27C1024-70JI operates from a single 5 V ±10% supply in read and standby modes. However, programming requires elevated VPP = 12.0 V ±0.5 V and temporarily increased VCC = 6.5 V, so a dual-supply programmer is mandatory. The AT27C1024-70JI does not support in-system programming with 5 V only.
How is the product identification code read from AT27C1024-70JI?
To read the identification code, hold all address lines A1–A15 low, set A9 to 11.5–12.5 V (VID), and toggle A0: low selects Manufacturer ID (001Eh), high selects Device Code (00F1h). Outputs O0–O15 reflect the 16-bit code. This function works only with VCC = 5 V and VPP = VCC - no programming voltage needed for ID read. The AT27C1024-70JI supports this feature in standard read mode.
Does AT27C1024-70JI require external decoupling capacitors, and if so, what values?
Yes - AT27C1024-70JI requires two decoupling capacitors: a 0.1 µF ceramic capacitor placed between VCC and GND as close as possible to pins 20 and 11/28, and a 4.7 µF bulk electrolytic capacitor near the power entry point of the EPROM array. These suppress transient excursions during CE transitions and stabilize VCC under rapid current draw, preventing non-conformance per the AT27C1024-70JI datasheet.
Is AT27C1024-70JI pin-compatible with AT27C516, and what are the key migration considerations?
Yes - AT27C1024-70JI is a direct upgrade from AT27C516 (512 Kbit), sharing identical 40-pin PDIP pinout, CE/OE control scheme, and programming methodology. Migration requires only doubling address lines (A15 added), updating firmware image size to 64K × 16, and verifying VPP timing compliance. No PCB changes are needed, making the AT27C1024-70JI a seamless capacity upgrade path.
AT27C1024-70JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C1024-70JI FAQ
1.How can I place an order for AT27C1024-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-70JI 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 AT27C1024-70JI reliable?
The price and inventory of AT27C1024-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-70JI is usually 5 days.
3.What payment methods are accepted for AT27C1024-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-70JI?
AT27C1024-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-70JI 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 AT27C1024-70JI?
For technical support, including AT27C1024-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-70JI requirements.
6.How does Aetrix verify that AT27C1024-70JI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-70JI 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 AT27C1024-70JI meets industry standards.
7.What is the process for return or replacement of AT27C1024-70JI?
All AT27C1024-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-70JI, 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 AT27C1024-70JI part is unused and in its original packaging.
Return procedure for AT27C1024-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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