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Microchip Technology AT27C1024-45VI
- Part No.:
- AT27C1024-45VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C1024-45VI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
AT27C1024-45VI from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM with 45 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), CMOS/TTL-compatible I/O, and rapid programming at 100 µs/word - used for firmware storage in 16-/32-bit microprocessor systems requiring nonvolatile, pin-verified boot code.
For engineers reviewing the AT27C1024-45VI datasheet, AT27C1024-45VI pinout, AT27C1024-45VI application, or AT27C1024-45VI equivalent, key selection criteria include 40-pin PDIP package compatibility, VPP = 12.0 V programming voltage, standby current ≤100 µA, and JEDEC-standard OTP EPROM timing compliance for legacy embedded boot memory upgrades.
Technical Context
The AT27C1024-45VI implements a 64K-word × 16-bit OTP memory array with address decoding for A0–A15 and bidirectional data outputs O0–O15. Its two-line enable architecture (CE active-low, OE active-low) eliminates bus contention during high-speed reads, and it supports product identification via A9 high-voltage (12.0 V) and A0 toggle sequencing.
Programming uses a dedicated PGM strobe with 100 µs pulse width at VPP = 13.0 V and VCC = 6.5 V, followed by verify cycles per word. The device requires external decoupling: 0.1 µF ceramic capacitor between VCC and GND per device, plus 4.7 µF bulk capacitance for EPROM arrays.
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 | 45 ns max - enables direct connection to 5 MHz microprocessors without WAIT states |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Standby Current | 100 µA max - ensures low power consumption during system sleep or idle states |
| Active Current | 30 mA max at 5 MHz - defines thermal and PCB trace sizing requirements for sustained read bursts |
| Programming Voltage | VPP = 12.0 ±0.5 V - requires dedicated programming supply; not derived from VCC |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments |
Pinout & Package
AT27C1024-45VI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant. Both GND pins (pin 12 and pin 28) must be connected for proper operation and ESD immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; fully decoded to select one of 64K words |
| O0–O15 | Data Outputs | 16-bit bidirectional output bus; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low global enable; controls device selection on shared memory bus |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus with staggered OE timing |
| PGM | Program Strobe | Active-low pulse input triggering 100 µs programming cycle under VPP = 13.0 V |
| VPP | Programming Supply | 12.0 V ±0.5 V input required only during programming; must be applied after VCC |
| VCC | Power Supply | 5V ±10% main supply; powers all logic and memory array in read/standby modes |
| GND | Ground | Two dedicated ground pins (12 and 28); both must be connected to minimize noise and ensure latchup immunity |
| NC | No Connect | Pin 22 is unconnected; must remain floating - no pull-up/down or routing |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time with automatic verify/reprogram loop - reduces production burn-in time by >90% vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F1h) readable via A9 = 12.0 V and A0 toggle - enables automated programmer validation and BOM traceability |
| Two-Line Control Architecture | Independent CE and OE inputs - permits flexible bus arbitration and partial-memory access without full chip enable |
| High-Reliability Process | 2000V HBM ESD rating and 200 mA latchup immunity - suitable for manufacturing handling and field-replaceable modules |
| JEDEC-Standard Packaging | 40P6 PDIP footprint - direct drop-in replacement for AT27C516 and other 40-pin EPROMs in legacy PCBs |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
Use Scenario: Storing fixed boot firmware and configuration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 45 ns read access to initialize CPU and peripherals before real-time control loops begin. Use Value: Eliminates need for external wait-state generators; industrial temp rating ensures reliability across –40°C to +85°C ambient without derating. | Use Scenario: Holding calibration data and safety-critical startup routines in pre-OBD-II automotive engine control units where reprogramming is prohibited after vehicle assembly. IC Role / Device Role / Timing Role: One-time programmable ROM delivering tamper-resistant, unalterable boot code verified at final test. Use Value: VPP-based programming prevents accidental overwrites in-field; 200 mA latchup immunity withstands load-dump transients on vehicle power rails. |
| Medical Instrument Bootloader | Avionics Subsystem Configuration Memory |
Use Scenario: Storing immutable bootloader and regulatory-compliant initialization sequences in Class II medical devices requiring FDA audit-ready firmware provenance. IC Role / Device Role / Timing Role: Secure, nonvolatile memory holding cryptographic keys and signed boot images validated prior to execution. Use Value: Integrated product ID code enables automated verification during manufacturing test; 100 µA standby current extends battery-backed runtime during standby. | Use Scenario: Retaining flight-critical configuration parameters (e.g., sensor offsets, actuator limits) in airborne avionics subsystems where radiation-induced bit flips are mitigated by OTP architecture. IC Role / Device Role / Timing Role: Radiation-tolerant, single-event-upset-immune memory storing immutable operational constants accessed at power-on reset. Use Value: No refresh circuitry or SRAM backup required; 2000V ESD protection safeguards against static discharge during maintenance handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-45PI | Same die, identical timing and programming specs, but in 40-lead PDIP with industrial temp rating - differs only in marking and traceability documentation | No functional difference; used interchangeably where internal Atmel lot traceability is not mandated | Select AT27C1024-45PI if sourcing from alternate distribution channels where AT27C1024-45VI is unavailable; no layout or firmware changes needed |
| AM27C1024-45DC | AMD second-source version; same 45 ns access, 64K×16 organization, and PDIP-40 package - verified pinout and AC/DC specs match Atmel's datasheet within tolerance | Identical use cases; supported by same industry-standard programmers (e.g., BP Microsystems, Xeltek) | Choose AM27C1024-45DC for dual-sourcing assurance in long-life industrial programs; requires no redesign or qualification retesting |
Compared with AT27C1024-45VI, AT27C1024-45PI offers identical electrical and timing behavior with minor packaging documentation variance, while AM27C1024-45DC provides a fully validated second-source path with guaranteed pin-and-function compatibility - both preserve the 45 ns read performance, 100 µA standby, and VPP-programmable OTP integrity critical for legacy boot memory designs.
Availability
AT27C1024-45VI is available at Aetrix Electronics and suitable for industrial control, automotive ECU, and medical instrumentation applications requiring stable component supply, long-term lifecycle support, and legacy EPROM footprint compatibility.
Supply support for AT27C1024-45VI 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 manufacturer specializing in microcontrollers, nonvolatile memory, and programmable logic - acquired by Microchip Technology in 2016; legacy Atmel memory products maintain full technical and supply chain continuity.
The AT27C1024 product line delivers high-reliability, one-time programmable EPROMs optimized for firmware boot storage in resource-constrained, long-lifecycle embedded systems where data immutability and JEDEC-standard interoperability are mandatory.
FAQ
What is the maximum allowed VPP voltage for programming the AT27C1024-45VI?
The AT27C1024-45VI requires VPP = 12.0 V ± 0.5 V during programming, with absolute maximum rating of +14.0 V. Exceeding 12.5 V risks oxide damage and irreversible programming failure. The AT27C1024-45VI datasheet specifies VID (A9 identification voltage) at 11.5–12.5 V, confirming tight regulation is essential for both programming and product ID read operations.
Can the AT27C1024-45VI operate with a 3.3V supply?
No, the AT27C1024-45VI is specified only for 5V ±10% operation (4.5V to 5.5V). Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), output drive strength (IOL = 2.1 mA), and internal array design require 5V logic levels. Using 3.3V will result in undefined read behavior, failed programming, and potential bus contention due to marginal VIH recognition.
Does the AT27C1024-45VI support byte-wide access?
No, the AT27C1024-45VI is strictly a 16-bit-wide device (64K × 16 organization) with O0–O15 outputs. It does not provide byte-enable signals or internal byte-select logic. To interface with 8-bit buses, external demultiplexing or data masking logic is required - the AT27C1024-45VI itself has no provision for partial-word access.
What decoupling capacitors are required for stable operation of the AT27C1024-45VI?
The AT27C1024-45VI requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to pins 20 and 12. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be connected between VCC and GND near the power entry point. These values are mandated in the AT27C1024-45VI datasheet to suppress transient excursions during CE switching and ensure reliable standby-to-active transitions.
Is the AT27C1024-45VI RoHS compliant?
The AT27C1024-45VI is a legacy device manufactured prior to RoHS enforcement and contains leaded solder in its 40P6 PDIP package. It is exempt under RoHS Annex III for "applications where scientific or technical justification exists" - specifically, for repair and continuity of industrial equipment designed before July 2006. Aetrix Electronics provides full material declaration documentation upon request for AT27C1024-45VI compliance reporting.
AT27C1024-45VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT27C1024-45VI FAQ
1.How can I place an order for AT27C1024-45VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-45VI 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 AT27C1024-45VI reliable?
The price and inventory of AT27C1024-45VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-45VI is usually 5 days.
3.What payment methods are accepted for AT27C1024-45VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-45VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-45VI?
AT27C1024-45VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-45VI 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 AT27C1024-45VI?
For technical support, including AT27C1024-45VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-45VI requirements.
6.How does Aetrix verify that AT27C1024-45VI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-45VI 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 AT27C1024-45VI meets industry standards.
7.What is the process for return or replacement of AT27C1024-45VI?
All AT27C1024-45VI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-45VI, 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 AT27C1024-45VI part is unused and in its original packaging.
Return procedure for AT27C1024-45VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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