My Inquiry
My Account
Microchip Technology AT27C1024-12VI
- Part No.:
- AT27C1024-12VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C1024-12VI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,506
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C1024-12VI 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 maximum read access time, 30 mA active current, and industrial temperature range (–40°C to +85°C). It serves as nonvolatile firmware storage in legacy microprocessor systems requiring pin-compatible upgrade from AT27C516.
For engineers reviewing the AT27C1024-12VI datasheet, AT27C1024-12VI pinout, AT27C1024-12VI application, or AT27C1024-12VI equivalent, this page delivers verified package mapping (40-lead PDIP), confirmed 16-bit parallel I/O architecture, JEDEC-standard two-line control (CE/OE), Rapid™ programming compatibility, and real-world use cases in boot ROM and embedded controller firmware.
Technical Context
The AT27C1024-12VI implements a CMOS OTP EPROM core with dual-control read enable (CE and OE), enabling bus contention avoidance in high-speed 16-/32-bit systems. Its address decoding covers A0–A15 (16 address lines), and data I/O uses O0–O15 (16 bidirectional output pins), with dedicated PGM and VPP pins for 13.0 V programming.
It supports three distinct operational modes: Read (CE=OE=VIL), Standby (CE=VIH), and Rapid Program (CE=VIL, OE=VIH, PGM=VIL, VPP=13.0 V). The integrated Product Identification Code-accessed via A9=12.0 V and A0 toggled-is electrically readable by standard programmers for automatic algorithm selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling full 16-bit word access without byte masking |
| Read Access Time | 120 ns max - eliminates WAIT states in 8-MHz Z80 or 10-MHz 80286 systems |
| Supply Voltage | 5 V ±10% - compatible with legacy TTL/CMOS logic rails without regulation overhead |
| Active Current | 30 mA max at 5 MHz - supports sustained burst reads in real-time firmware execution |
| Standby Current | 100 µA max (CMOS CE) - enables low-power hold during processor sleep cycles |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires external high-voltage supply; not 5 V-only programmable |
| Operating Temperature | –40°C to +85°C - qualified for industrial control cabinets and factory automation environments |
Pinout & Package
AT27C1024-12VI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 2×20 lead arrangement and Pin 1 identifier notch. Both GND pins (Pin 10 and Pin 24) must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; fully decoded to select one of 65,536 words |
| O0–O15 | Data Outputs | True 16-bit parallel output bus; high-impedance when OE or CE inactive |
| CE | Chip Enable | Primary device select; must be low for read or program; controls global output enable |
| OE | Output Enable | Secondary output gate; allows shared bus operation when CE active but OE high |
| PGM | Program Strobe | Active-low pulse input (100 µs width) that triggers single-word programming when VPP=13 V |
| VPP | Programming Supply | 13.0 V input required only during programming; must be applied after and removed before VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and outputs during read; supplies ICC ≤30 mA |
| GND | Ground | Two dedicated ground pins (Pin 10, Pin 24); both must be connected to minimize noise and ensure latchup immunity |
| NC | No Connect | Pin 22 is unconnected; must remain floating - no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time with auto-verify loop - reduces firmware burn time by >5× vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F1h) readable via A9=12 V and A0 toggle - enables zero-config programmer recognition |
| Two-Line Output Control | Independent CE and OE inputs - prevents bus contention during multi-device memory mapping in 16-bit data buses |
| High-Reliability Process | 2000 V HBM ESD rating and 200 mA latchup immunity - ensures robustness in manual handling and noisy industrial PCBs |
| JEDEC Standard Packaging | 40P6 PDIP footprint - direct drop-in replacement for AT27C512, AT27C516, and other 40-pin EPROMs in existing sockets |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Boot ROM |
|---|---|
Use Scenario: Storing ladder logic interpreter and I/O configuration tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware ROM accessed at power-up by 80C188EC CPU; provides deterministic 120 ns read latency. Use Value: Eliminates reliance on slow serial EEPROM or volatile RAM + battery backup; withstands 85°C cabinet temperatures without derating. | Use Scenario: Holding POST routines and hardware initialization code in ISA-bus-based industrial PCs (e.g., Advantech IPC-510). IC Role / Device Role / Timing Role: 16-bit wide boot ROM mapped to 0xF0000–0xFFFFF; selected via A19–A16 decode and CE/OE gating. Use Value: Enables single-cycle instruction fetches for x86 real-mode code; supports direct upgrade from AT27C516 without board redesign. |
| Embedded Controller Boot Image | Test Equipment Microcode Storage |
Use Scenario: Storing bootloader and peripheral driver images in custom 16-bit microcontroller modules (e.g., based on Motorola 68HC16). IC Role / Device Role / Timing Role: Primary firmware source during cold start; accessed via 16-bit data bus with CE asserted by address decoder. Use Value: Guarantees bit-identical firmware replication across production units; immune to accidental overwrite during field operation. | Use Scenario: Holding calibration algorithms and instrument control microcode in automated test systems (e.g., Teradyne J750 derivative boards). IC Role / Device Role / Timing Role: Static microcode store for FPGA-based pattern generators; read asynchronously during vector execution. Use Value: Provides deterministic 120 ns access to microinstruction words; supports rapid reprogramming during test station maintenance windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-12PI | Same die, identical timing and pinout, but in 44-lead PLCC (44J) package instead of PDIP | Requires PCB footprint change; better thermal dissipation and higher vibration resistance | Select when space-constrained layouts or automated assembly favor surface-mount over through-hole |
| AM27C1024-12DC | AMD second-source part; same 64K×16 organization, 120 ns access, 5 V supply, but different ID code and minor AC parameter tolerances | Validated in same legacy systems; used where dual-sourcing is mandated by procurement policy | Choose for supply chain diversification without functional or layout impact |
Compared with AT27C1024-12VI, the AT27C1024-12PI offers superior mounting reliability in high-shock environments but demands PLCC socket or reflow capability, while AM27C1024-12DC provides guaranteed second-source availability with identical system-level timing behavior and pin compatibility.
Availability
AT27C1024-12VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS boot ROM, and embedded controller boot image applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C1024-12VI 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 the AT27C series.
The AT27C1024 belongs to Atmel's OTP EPROM product line, designed specifically for cost-sensitive, high-reliability firmware storage in industrial and automotive control systems where reprogrammability is unnecessary but long-term data retention is critical.
FAQ
What is the maximum operating temperature range for the AT27C1024-12VI?
The AT27C1024-12VI is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the datasheet's "Ordering Information" table, where the suffix "I" denotes industrial grade. It is not rated for automotive (–40°C to +125°C) or extended commercial ranges, and operation outside –40°C to +85°C may result in timing violations or data retention loss.
Does the AT27C1024-12VI support in-system programming?
No, the AT27C1024-12VI does not support in-system programming. It requires removal from the target board and insertion into a dedicated EPROM programmer capable of supplying 13.0 V to VPP and delivering precise 100 µs PGM pulses. The device lacks serial interfaces, JTAG, or any on-chip programming logic - programming is strictly off-line and one-time.
Can the AT27C1024-12VI be used as a direct replacement for the AT27C516?
Yes, the AT27C1024-12VI is explicitly documented as a direct upgrade from the AT27C516 (512K-bit, 32K×16). It shares identical pinout, voltage levels, CE/OE control protocol, and 16-bit data bus interface. The only hardware change needed is widening the address bus to A15 (adding one trace), as the AT27C516 uses only A0–A14.
What decoupling capacitors are required for stable operation of the AT27C1024-12VI?
The AT27C1024-12VI requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to Pins 20 (VCC) and 10/24 (GND). For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are specified in the "System Considerations" section to suppress transient excursions during CE switching.
Is the AT27C1024-12VI RoHS compliant?
The AT27C1024-12VI is not RoHS compliant. As a legacy PDIP device manufactured prior to RoHS enforcement, it contains leaded solder in its leads and lead-based die attach. Microchip does not offer a RoHS-compliant variant of this specific speed grade and package; RoHS alternatives would require migration to flash-based solutions like the SST39VF1601 or equivalent, which differ electrically and architecturally.
AT27C1024-12VI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT27C1024-12VI FAQ
1.How can I place an order for AT27C1024-12VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-12VI 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 AT27C1024-12VI reliable?
The price and inventory of AT27C1024-12VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-12VI is usually 5 days.
3.What payment methods are accepted for AT27C1024-12VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-12VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-12VI?
AT27C1024-12VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-12VI 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 AT27C1024-12VI?
For technical support, including AT27C1024-12VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-12VI requirements.
6.How does Aetrix verify that AT27C1024-12VI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-12VI 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 AT27C1024-12VI meets industry standards.
7.What is the process for return or replacement of AT27C1024-12VI?
All AT27C1024-12VI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-12VI, 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 AT27C1024-12VI part is unused and in its original packaging.
Return procedure for AT27C1024-12VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C1024-12VI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
