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Microchip Technology AT27C1024-12VC
- Part No.:
- AT27C1024-12VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C1024-12VC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,044
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Product details
Overview
AT27C1024-12VC from Microchip Technology (formerly Atmel) is a 1-Mbit one-time programmable EPROM organized as 64K × 16 bits, operating at 5V ±10%, with 120 ns read access time, CMOS/TTL-compatible I/O, and dual-line control (CE/OE). It serves as firmware storage in legacy 16-bit microprocessor systems requiring nonvolatile, pin-verified boot code.
For engineers reviewing the AT27C1024-12VC datasheet, AT27C1024-12VC pinout, AT27C1024-12VC application, or AT27C1024-12VC equivalent, key selection criteria include 40-pin VSOP package compatibility, 120 ns tACC timing grade, VPP-programming voltage requirement (12.0 V ±0.5 V), and OTP reliability for unmodified firmware deployment.
Technical Context
The AT27C1024-12VC implements a parallel-addressed OTP memory architecture with 16-bit bidirectional data outputs (O0–O15), 16 address inputs (A0–A15), and dedicated programming control via PGM and VPP pins. Its two-line enable scheme (CE active-low, OE active-low) eliminates bus contention in high-speed 16-bit data buses.
It supports Rapid™ programming with 100 µs/word typical pulse width at VCC = 6.5 V and VPP = 13.0 V, and includes integrated product identification (A9-based voltage-selectable Manufacturer ID and Device Code), enabling automated programmer recognition and algorithm selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16); enables full 16-bit word storage for boot ROM or fixed firmware images. |
| Read Access Time (tACC) | 120 ns max; ensures compatibility with 8 MHz Z80 or 10 MHz 80286 systems without wait states. |
| Supply Voltage | 5 V ±10%; operates directly from standard logic rail without regulation overhead. |
| Standby Current (ISB) | 100 µA max (CMOS CE); minimizes quiescent power in always-on embedded controllers. |
| Active Current (ICC) | 30 mA max at 5 MHz; supports burst reads in real-time control loops with thermal margin. |
| VPP Programming Voltage | 12.0 V ±0.5 V on A9 during ID read; required for device identification and not used in normal read mode. |
| ESD Protection | 2000 V HBM; meets industrial handling requirements without external protection diodes. |
Pinout & Package
AT27C1024-12VC is packaged in a 40-lead Very Small Outline Package (VSOP), 10 mm × 14 mm body, JEDEC MO-142 CA compliant, with gull-wing leads and pin 1 indicator notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on CE low to select one of 64K words. |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; high-impedance when CE or OE is high. |
| CE | Chip Enable | Active-low global enable; disables outputs and reduces ICC to ISB when high. |
| OE | Output Enable | Active-low output gate; allows shared bus operation with other peripherals. |
| PGM | Program Strobe | Active-low pulse input (100 µs width) that initiates programming cycle when VPP = 13 V. |
| VPP | Programming Voltage | 12–13 V input during programming; must be applied after VCC and removed before VCC. |
| NC | No Connect | Unbonded pin; must remain floating-no routing or termination required. |
| GND | Ground | Two dedicated ground pins (pins 10 and 29); both must be connected to minimize noise and ensure timing compliance. |
| VCC | Power Supply | +5 V supply; requires local 0.1 µF ceramic decoupling capacitor per device. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time enables <1-second full-device programming, reducing production test cycle time. |
| Integrated Product Identification Code | Electrically readable Manufacturer ID (001Eh) and Device Code (00F1h) via A9/VH and A0 toggle, ensuring correct algorithm selection by universal programmers. |
| JEDEC-Standard Packages | 40-lead VSOP footprint matches industry-standard layout for drop-in replacement of legacy 27C1024 variants without PCB redesign. |
| Two-Line Control Architecture | Independent CE and OE enables simultaneous chip selection and output gating-critical for multi-peripheral bus arbitration in 16-bit systems. |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2000 V ESD rating allow direct mounting on industrial control boards without guard rings or shielding. |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
Use Scenario: Fixed ladder-logic firmware stored in AT27C1024-12VC powers the core controller of DIN-rail-mounted programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 120 ns read access to instruction fetches during cold start and runtime execution. Use Value: Eliminates reliance on external EEPROM or flash, avoiding wear-out concerns and guaranteeing bit-for-bit firmware integrity across 10+ year deployments. | Use Scenario: Calibration constants and self-test routines for benchtop oscilloscopes and signal generators manufactured in the late 1990s. IC Role / Device Role / Timing Role: OTP EPROM holding immutable calibration coefficients and diagnostic firmware accessed via 16-bit ISA bus. Use Value: Prevents accidental overwrites during field service while maintaining full compatibility with aging ZIF socket programmers and test jigs. |
| Avionics Maintenance Terminal BIOS | Military Radio Control Logic |
Use Scenario: Read-only system initialization code for portable avionics maintenance terminals used on commercial aircraft line maintenance. IC Role / Device Role / Timing Role: Power-on boot ROM delivering verified startup sequence to 80C188 CPU with guaranteed 120 ns tACC under wide temperature range (-40°C to +85°C). Use Value: Meets DO-254 design assurance level DAL-C by eliminating reprogrammability risks and supporting traceable, locked firmware builds. | Use Scenario: Command decoding and state-machine logic in HF/VHF tactical radios deployed in armored vehicle platforms. IC Role / Device Role / Timing Role: OTP storage for encrypted control state tables and frequency-hopping pattern maps accessed synchronously with FPGA sequencer. Use Value: Provides tamper-resistant firmware storage immune to electromagnetic pulse (EMP) and radiation-induced bit flips due to CMOS process hardening. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-12PC | Same die, 40-lead PDIP package (600-mil width); no lead pitch or thermal profile change. | Preferred for through-hole prototyping, manual rework, or legacy board repair where VSOP reflow is unavailable. | Select AT27C1024-12PC only if board layout uses DIP sockets or wave-solder assembly is required. |
| AT27C1024-12JI | Same functionality and timing, but rated for -40°C to +85°C industrial temperature range and packaged in VSOP. | Suitable for extended-temperature environments such as outdoor base stations or motor control cabinets. | Choose AT27C1024-12JI when ambient operating temperature exceeds 70°C but VSOP footprint must be retained. |
Compared with AT27C1024-12VC, the AT27C1024-12PC offers mechanical serviceability at the cost of higher board area and no surface-mount scalability, while AT27C1024-12JI delivers extended thermal robustness without altering PCB layout-making it ideal for industrial upgrades where the original VC-grade part fails under thermal stress.
Availability
AT27C1024-12VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy test equipment boot ROM, and avionics maintenance terminal BIOS requiring stable component supply and long-term obsolescence management.
Supply support for AT27C1024-12VC 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 support for legacy Atmel memory products, including documentation, programming tools, and cross-reference guidance.
The AT27C1024 belongs to Atmel's 27C-series OTP EPROM family, designed specifically for reliable, low-risk firmware storage in cost-sensitive industrial and automotive control systems where reprogrammability is unnecessary and data integrity is mission-critical.
FAQ
What is the maximum operating temperature range for the AT27C1024-12VC?
The AT27C1024-12VC is specified for commercial operation from 0°C to +70°C. This range is explicitly defined in the Ordering Information table for the "VC" suffix, confirming its qualification for office and benign-environment applications-not industrial or automotive use. For extended temperature grades, consider AT27C1024-12VI (–40°C to +85°C) or AT27C1024-12JA (–40°C to +125°C).
Does the AT27C1024-12VC require a separate programming voltage during normal read operation?
No, the AT27C1024-12VC operates from a single 5 V ±10% supply during read mode. VPP is only required during programming or product identification cycles and must be disconnected or held at VCC during standard read access. Applying VPP during read may cause excessive current draw or functional failure.
Can the AT27C1024-12VC be used as a direct replacement for the AT27C516 EPROM?
Yes-the AT27C1024-12VC is documented as a direct upgrade from the 512K-bit AT27C516, offering double the density (64K × 16 vs. 32K × 16) with identical pinout, voltage, and timing interface. No hardware changes are needed beyond updating firmware image size and verifying address decoding for the expanded A15 bit.
What decoupling capacitance is required for stable operation of the AT27C1024-12VC?
The AT27C1024-12VC requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close as possible to pins 19 (VCC) and 10/29 (GND). For arrays of multiple devices, add a 4.7 µF bulk electrolytic capacitor near the power entry point to suppress ripple-induced timing violations.
How is the product identification code read from the AT27C1024-12VC?
The AT27C1024-12VC identification code is read by setting A9 to 12.0 V ±0.5 V (VID), holding A1–A15 low, and toggling A0: low selects Manufacturer ID (001Eh), high selects Device Code (00F1h). Both codes appear on O15–O0 during a standard read cycle with CE and OE asserted, and VPP = VID.
AT27C1024-12VC 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT27C1024-12VC FAQ
1.How can I place an order for AT27C1024-12VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-12VC 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 AT27C1024-12VC reliable?
The price and inventory of AT27C1024-12VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-12VC is usually 5 days.
3.What payment methods are accepted for AT27C1024-12VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-12VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-12VC?
AT27C1024-12VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-12VC 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 AT27C1024-12VC?
For technical support, including AT27C1024-12VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-12VC requirements.
6.How does Aetrix verify that AT27C1024-12VC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-12VC 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 AT27C1024-12VC meets industry standards.
7.What is the process for return or replacement of AT27C1024-12VC?
All AT27C1024-12VC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-12VC, 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 AT27C1024-12VC part is unused and in its original packaging.
Return procedure for AT27C1024-12VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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