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Microchip Technology AT27C1024-90VI
- Part No.:
- AT27C1024-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C1024-90VI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,543
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Product details
Overview
AT27C1024-90VI from Microchip Technology (formerly Atmel) is a 1-Mbit one-time programmable EPROM organized as 64K × 16 bits, operating at 5V ±10%, with 90 ns read access time, CE/OE dual-line control, and industrial temperature range (–40°C to +85°C). It serves as firmware storage in legacy microprocessor systems requiring nonvolatile, pin-compatible upgrade from AT27C516.
For engineers reviewing the AT27C1024-90VI datasheet, AT27C1024-90VI pinout, AT27C1024-90VI application, or AT27C1024-90VI equivalent, key selection criteria include 40-pin PDIP package compatibility, VPP programming voltage handling (12.0 V ±0.5 V), standby current ≤100 µA, rapid 100 µs/word programming, and JEDEC-standard OTP EPROM timing compliance.
Technical Context
The AT27C1024-90VI implements a CMOS-based OTP EPROM architecture with two-line enable control (CE and OE), eliminating bus contention in high-speed 16-bit data bus systems. Its by-16 organization supports direct interfacing with 16-bit microprocessors and DSPs without external data-width translation.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs/word typical pulse width, requiring VCC = 6.5 V and VPP = 13.0 V during programming. Product identification is enabled via A9 high-voltage (11.5–12.5 V) and A0 toggling to select manufacturer or device code words.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16); supports full 16-bit parallel data bus interface without multiplexing. |
| Read Access Time | 90 ns max; eliminates WAIT states in 5 MHz microprocessor systems. |
| Supply Voltage | 5 V ±10%; single-supply operation in read mode-no auxiliary voltages required for normal access. |
| Standby Current | 100 µA max (CMOS CE input); enables low-power retention in battery-backed or intermittent-read systems. |
| Programming Voltage | VPP = 12.0 V ±0.5 V on dedicated pin; isolated from VCC during programming to prevent supply coupling. |
| Operating Temperature | –40°C to +85°C; qualified for industrial-grade embedded control and instrumentation applications. |
| Input Compatibility | CMOS and TTL compatible inputs; accepts standard logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
Pinout & Package
AT27C1024-90VI 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 stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; fully decoded to select one of 64K words; all must be stable before CE/OE assertion. |
| O0–O15 | Data Outputs | 16-bit bidirectional output bus; high-impedance when OE or CE is high; VOL ≤ 0.4 V at 2.1 mA sink. |
| CE | Chip Enable | Active-low primary chip select; controls device power state-VIH ≥ 2.0 V places part in standby (≤100 µA). |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus; tDF ≤ 40 ns ensures fast bus release. |
| PGM | Program Strobe | Active-low programming trigger; requires 95–105 µs pulse width synchronized with VPP and address setup. |
| VPP | Programming Supply | 12.0 V ±0.5 V input during programming only; must be applied after and removed before VCC per sequencing rules. |
| VCC | Power Supply | 5 V ±10% main supply; delivers ≤30 mA active current at 5 MHz; decoupling requires 0.1 µF ceramic + 4.7 µF bulk cap. |
| GND | Ground | Two dedicated ground pins (12 & 28); both must be connected to minimize noise and ensure ESD immunity (2000 V). |
| NC | No Connect | Pin 21 is unconnected; must remain floating-no routing or termination permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 100 µs/word typical programming time reduces firmware burn-in cycle duration by >90% vs. legacy EPROMs. |
| Integrated Identification Code | Manufacturer (001Eh) and device (00F1h) codes readable via A9 high-voltage and A0 toggle-enables automated programmer validation. |
| Two-Line Control Architecture | Independent CE and OE inputs allow flexible bus arbitration and partial-address decoding in multi-chip memory maps. |
| High-Reliability Process | 2000 V HBM ESD rating and 200 mA latchup immunity support robust operation in noisy industrial environments. |
| JEDEC-Standard Packaging | 40P6 PDIP footprint ensures drop-in replacement for AT27C512/AT27C516 in existing PCB layouts. |
Applications
| Industrial PLC Firmware Storage | Legacy 16-Bit Microprocessor Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping firmware in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 90 ns read access to instruction fetch cycles of Motorola 68000-class CPUs. Use Value: Eliminates reliance on slow serial EEPROM or volatile SRAM with battery backup-ensures instant, reliable startup after power loss. |
Use Scenario: Providing BIOS and peripheral initialization code for vintage 16-bit embedded systems such as test equipment and medical analyzers. IC Role / Device Role / Timing Role: Primary read-only instruction store interfaced directly to 16-bit data bus and address decoder logic. Use Value: Matches timing budgets of 5 MHz Z8000 or NS32016 systems without WAIT-state insertion, preserving real-time determinism. |
| Automotive Engine Control Module (ECU) Calibration Data | Military Communications Radio Configuration Memory |
Use Scenario: Holding immutable calibration tables and safety-critical lookup data in engine control units operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: OTP storage element accessed during cold-start initialization sequence prior to RAM population. Use Value: Guarantees data integrity over 15+ year service life with zero risk of bit corruption from radiation or voltage transients. |
Use Scenario: Storing cryptographic keys and RF channel configuration parameters in secure HF/VHF radios used in field-deployed tactical systems. IC Role / Device Role / Timing Role: Tamper-resistant, one-time-programmable memory block isolated from runtime software execution paths. Use Value: Prevents unauthorized reprogramming or cloning-physical OTP fuse structure provides hardware-level security assurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-90PI | Same silicon, identical AC/DC specs, but in PDIP package with commercial temperature range (0°C to 70°C). | Limited to non-industrial environments; unsuitable for extended thermal cycling or convection-cooled enclosures. | Select AT27C1024-90PI only if board operates within 0–70°C and cost sensitivity outweighs long-term reliability requirements. |
| AT27C1024-90VC | Same functionality in 40-lead VSOP (10 mm × 14 mm) package; pinout differs-A9/A10 positions swapped vs. PDIP. | Requires PCB redesign; suited for space-constrained designs where 40P6 footprint is unavailable. | Choose AT27C1024-90VC only when board layout mandates surface-mount packaging and thermal profile permits reflow-compatible mounting. |
Compared with AT27C1024-90PI and AT27C1024-90VC, the AT27C1024-90VI offers guaranteed industrial temperature operation in the widely supported 40P6 PDIP footprint-making it the optimal choice for new industrial designs and legacy system refreshes requiring drop-in compatibility and extended thermal margin.
Availability
AT27C1024-90VI is available at Aetrix Electronics and suitable for industrial control systems, legacy microprocessor boot applications, and automotive ECU calibration storage requiring stable component supply across extended lifecycle programs.
Supply support for AT27C1024-90VI 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 product support, qualification, and manufacturing continuity for the AT27C1024 family.
The AT27C1024 series was designed as a high-reliability, industry-standard OTP EPROM for firmware storage in 16-bit embedded systems-emphasizing pin compatibility, rapid programming, and robustness in harsh environments.
FAQ
What is the maximum allowed VPP voltage for programming the AT27C1024-90VI?
The AT27C1024-90VI 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 or inconsistent fuse programming. The device specification mandates strict sequencing: VCC must be applied before VPP and removed after VPP. Always verify VPP stability using a low-noise, well-decoupled 12 V supply with ≤100 mV ripple.
Can the AT27C1024-90VI be used as a direct replacement for AT27C516 in an existing design?
Yes-the AT27C1024-90VI is explicitly designed as a direct upgrade from the AT27C516 (512K × 8), sharing identical 40-pin PDIP pinout, 5 V operation, and dual-line (CE/OE) control. Its 64K × 16 organization doubles capacity while maintaining byte-access compatibility via O0–O7 subset usage. No PCB changes are required, though firmware must be recompiled for 16-bit addressing.
What decoupling capacitors are required for stable operation of the AT27C1024-90VI?
The AT27C1024-90VI requires two decoupling capacitors: a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close as possible to Pins 20 and 28, plus a 4.7 µF bulk electrolytic capacitor near the power entry point of the EPROM array. This dual-capacitor strategy suppresses both high-frequency switching noise and low-frequency supply droop, ensuring reliable read timing and preventing transient-induced data corruption.
Does the AT27C1024-90VI support verification after programming?
Yes-the AT27C1024-90VI implements full PGM Verify mode: with CE and OE low and PGM high, the device outputs programmed data at O0–O15 for comparison against expected values. This occurs at VPP = 13.0 V and is integral to the Rapid™ Programming Algorithm, which applies up to ten 100 µs pulses per word until verification passes or failure is declared.
How is the manufacturer and device identification code read from the AT27C1024-90VI?
The AT27C1024-90VI contains two 16-bit identification words accessible via special addressing: hold A1–A15 low, apply VH (11.5–12.5 V) to A9, then toggle A0-low selects Manufacturer ID (001Eh), high selects Device Code (00F1h). This requires a high-voltage capable programmer and is used by industry-standard tools to auto-detect device type and select correct programming algorithms.
AT27C1024-90VI 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:
- 90 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
AT27C1024-90VI FAQ
1.How can I place an order for AT27C1024-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-90VI 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 AT27C1024-90VI reliable?
The price and inventory of AT27C1024-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-90VI is usually 5 days.
3.What payment methods are accepted for AT27C1024-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-90VI?
AT27C1024-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-90VI 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 AT27C1024-90VI?
For technical support, including AT27C1024-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-90VI requirements.
6.How does Aetrix verify that AT27C1024-90VI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-90VI 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 AT27C1024-90VI meets industry standards.
7.What is the process for return or replacement of AT27C1024-90VI?
All AT27C1024-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-90VI, 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 AT27C1024-90VI part is unused and in its original packaging.
Return procedure for AT27C1024-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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