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Microchip Technology AT27C1024-90PC
- Part No.:
- AT27C1024-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-90PC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,644
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Product details
Overview
AT27C1024-90PC from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM in 40-lead PDIP package, featuring 90 ns read access time, 5V ±10% supply operation, and dual-line control (CE/OE) for bus contention avoidance. It serves as firmware storage in legacy 16-bit microprocessor systems requiring non-volatile, pin-compatible upgrade from AT27C516.
For engineers reviewing the AT27C1024-90PC datasheet, AT27C1024-90PC pinout, AT27C1024-90PC application, or AT27C1024-90PC equivalent, key selection criteria include verified 90 ns tACC timing, VPP = 12.0 V programming voltage, GND pin pairing requirement, and JEDEC-standard PDIP mechanical compatibility with existing 40P6 sockets.
Technical Context
The AT27C1024-90PC implements a CMOS OTP EPROM architecture with address decoding for A0–A15 inputs and 16-bit bidirectional data outputs O0–O15. Its two-line enable logic (CE active-low, OE active-low) enables high-speed read cycles without WAIT states in 16-bit bus systems.
Programming uses Rapid™ algorithm with 100 µs/word PGM pulses at VPP = 12.0 V ±0.5 V and VCC = 6.5 V ±0.25 V; product identification is accessed via A9 = VH and A0 toggling while all other address lines are held low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling full firmware image storage for 16-bit MCUs without external multiplexing |
| Read Access Time | 90 ns max (tACC), ensuring compatibility with 10 MHz system clocks without wait-state insertion |
| Supply Voltage | 5V ±10%, supporting direct interface with TTL/CMOS logic without level-shifting |
| Active Current | 30 mA max at 5 MHz, defining thermal budget for dense EPROM arrays on PCBs |
| Standby Current | 100 µA max (ISB1, CMOS CE), enabling low-power hold mode during processor idle cycles |
| Programming Voltage | VPP = 12.0 V ±0.5 V, requiring dedicated HV supply rail separate from VCC during programming |
| Operating Range | 0°C to 70°C (Commercial), validated for industrial control panels and test equipment environments |
Pinout & Package
AT27C1024-90PC is housed in a 40-lead, 0.600" wide plastic dual inline package (PDIP, JEDEC MS-011 AC), with dual GND pins (Pin 10 and Pin 24) requiring mandatory connection per datasheet note.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; all 16 lines required to access full 64K word space |
| O0–O15 | Data Outputs | True 16-bit parallel data bus; outputs float when CE or OE is high |
| CE | Chip Enable | Active-low global chip select; controls device power state transition between standby and active |
| OE | Output Enable | Active-low output gate; enables data bus drivers independently of CE for shared-bus arbitration |
| PGM | Program Strobe | Active-low pulse input triggering 100 µs programming cycle when VPP is asserted |
| VPP | Programming Voltage | 12.0 V ±0.5 V input; must be applied after VCC and removed before VCC per sequencing rule |
| VCC | Power Supply | 5V ±10% main supply; powers logic and output drivers during read and program modes |
| GND | Ground | Two dedicated ground pins (10 and 24); both must be connected to minimize noise and ensure latchup immunity |
| NC | No Connect | Pin 22 is unconnected; must remain floating-no external tie or pull-up/down |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 100 µs/word typical programming time reduces firmware burn time by >90% vs. legacy EPROMs |
| Integrated ID Code | Manufacturer (001Eh) and device code (00F1h) accessible via A9/A0 control-enables automated programmer validation |
| ESD/Latchup Robustness | 2000V HBM ESD rating and 200 mA latchup immunity support handling in non-EPA assembly lines |
| JEDEC Package Compliance | 40P6 PDIP footprint ensures drop-in replacement for AT27C516 and other 40-pin EPROMs in legacy sockets |
| Two-Line Control Logic | Independent CE/OE enables simultaneous memory mapping and bus sharing with peripherals without contention |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers operating in factory-floor environments with 0°C–70°C ambient. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing immediate instruction fetch at power-on; 90 ns tACC eliminates need for WAIT states in 80C188-based controllers. Use Value: Enables deterministic startup within 100 µs of VCC stabilization, meeting IEC 61131-2 reaction time requirements for safety-critical control loops. | Use Scenario: Holding calibration constants and self-test routines in automated test systems where firmware updates occur infrequently but reliability is paramount. IC Role / Device Role / Timing Role: Read-only firmware repository accessed only during power-up or manual recalibration; CE-driven standby mode reduces system quiescent current. Use Value: 100 µA max ISB1 allows multi-EPROM configurations without exceeding 1 mA total standby draw in rack-mounted instruments. |
| Avionics Maintenance Terminal BIOS | Medical Imaging System Boot Loader |
Use Scenario: Storing diagnostic firmware in portable avionics test sets used for Line Replaceable Unit (LRU) verification in commercial aircraft maintenance bays. IC Role / Device Role / Timing Role: Secure, tamper-resistant boot image source; OTP nature prevents accidental overwrite during field servicing. Use Value: Eliminates risk of corrupted firmware from ESD events or power glitches-critical for DO-160E Section 20 compliance in airborne equipment. | Use Scenario: Hosting initialization code for FPGA-based image acquisition subsystems in ultrasound machines requiring guaranteed first-boot integrity. IC Role / Device Role / Timing Role: Primary boot loader executing before DRAM initialization; delivers deterministic reset vector fetch independent of volatile memory state. Use Value: 64K × 16 organization provides sufficient space for secure boot chain + hardware abstraction layer, avoiding external memory mapping complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-90JI | Same die, Industrial temperature range (−40°C to +85°C); identical 90 ns timing and pinout | Validated for extended thermal cycling in motor drive control cabinets and outdoor telecom enclosures | Select when operating ambient exceeds 70°C or requires AEC-Q200-aligned qualification evidence |
| AT27C512-90PC | 512 Kbit (64K × 8) density; same 40P6 PDIP package and 90 ns speed grade but 8-bit data bus | Requires external byte-wide data path; unsuitable for native 16-bit MCU interfaces without glue logic | Choose only if system design is constrained to 8-bit data bus or legacy board layout cannot accommodate 16-bit width |
Compared with AT27C1024-90JI, the AT27C1024-90PC offers lower cost and adequate thermal margin for commercial indoor equipment, while AT27C512-90PC forces redesign of data-path routing and increases component count due to its half-width interface.
Availability
AT27C1024-90PC 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 across long-lifecycle programs.
Supply support for AT27C1024-90PC 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, non-volatile memory, and programmable logic, acquired by Microchip Technology in 2016.
The AT27C1024 belongs to Atmel's OTP EPROM product line, designed specifically for reliable, low-cost firmware storage in 16-bit embedded systems where reprogrammability is unnecessary and data retention over 10 years is mandatory.
FAQ
What is the maximum allowable VPP voltage for programming the AT27C1024-90PC?
The AT27C1024-90PC requires VPP = 12.0 V ± 0.5 V during programming, with absolute maximum rating of +14.0 V. Exceeding 12.5 V risks oxide breakdown in the floating-gate cells, while voltages below 11.5 V may cause incomplete programming and subsequent read failures. The AT27C1024-90PC datasheet specifies VID = 11.5–12.5 V for A9-based product identification, confirming this tight tolerance window.
Does the AT27C1024-90PC require external decoupling capacitors, and if so, what values?
Yes, the AT27C1024-90PC requires two decoupling capacitors: a 0.1 µF ceramic capacitor placed between VCC and GND as close as possible to Pins 20 and 10/24, plus a 4.7 µF bulk electrolytic capacitor near the power entry point for EPROM arrays. These are mandated in the "System Considerations" section to suppress transients during CE switching and stabilize VCC under rapid current demand during read cycles.
Can the AT27C1024-90PC be used in place of the AT27C516 in an existing design?
Yes, the AT27C1024-90PC is explicitly documented as a direct upgrade from the AT27C516, sharing identical 40P6 PDIP package, pinout, and 5V operation. However, its 64K × 16 organization doubles the addressable space-designers must verify that A15 is properly driven and that the 16-bit data bus is fully utilized, as unused O8–O15 lines in 8-bit systems may float.
What is the purpose of the NC pin on the AT27C1024-90PC, and how should it be handled?
Pin 22 of the AT27C1024-90PC is designated NC (No Connect) and contains no internal connection. It must remain electrically floating-no pull-up, pull-down, or tie to VCC/GND. This is confirmed in the "Pin Configurations" table and "Pin Name Function" list; connecting it risks unintended current paths or noise coupling into adjacent signal lines like A14 or A13.
How does the AT27C1024-90PC handle output bus contention in multi-device systems?
The AT27C1024-90PC prevents bus contention using dual active-low controls: CE enables the chip and OE gates the outputs. When OE is high (VIH), outputs enter high-impedance state regardless of CE status-allowing multiple devices to share the same data bus. This is specified in the "Operating Modes" table under "Output Disable" mode, where outputs go to High Z with OE = VIH and CE = X.
AT27C1024-90PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C1024-90PC FAQ
1.How can I place an order for AT27C1024-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-90PC 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 AT27C1024-90PC reliable?
The price and inventory of AT27C1024-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-90PC is usually 5 days.
3.What payment methods are accepted for AT27C1024-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-90PC?
AT27C1024-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-90PC 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 AT27C1024-90PC?
For technical support, including AT27C1024-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-90PC requirements.
6.How does Aetrix verify that AT27C1024-90PC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-90PC 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 AT27C1024-90PC meets industry standards.
7.What is the process for return or replacement of AT27C1024-90PC?
All AT27C1024-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-90PC, 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 AT27C1024-90PC part is unused and in its original packaging.
Return procedure for AT27C1024-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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