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Microchip Technology AT27C1024-45PU
- Part No.:
- AT27C1024-45PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-45PU.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:169
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Product details
Overview
AT27C1024-45PU from Atmel is a 1,048,576-bit (64K × 16) one-time programmable EPROM designed for nonvolatile firmware storage in 16-/32-bit microprocessor systems. It delivers 45ns read access time, operates from a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 40-lead PDIP package.
For engineers reviewing the AT27C1024-45PU datasheet, AT27C1024-45PU pinout, AT27C1024-45PU application, or AT27C1024-45PU equivalent, key selection criteria include fast read timing, CMOS/TTL compatibility, rapid programming (100µs/word), low active current (30mA max at 5MHz), and dual-line control (CE/OE) for bus contention avoidance in high-speed embedded systems.
Technical Context
The AT27C1024-45PU implements a parallel x16 memory architecture with two-line enable control (CE and OE), enabling precise output gating and eliminating bus contention during read cycles. Its address space spans A0–A15 (16-bit), supporting direct mapping to 16-bit data buses without external demultiplexing.
It features integrated product identification logic accessible via A9 high-voltage strobe (12.0V ±0.5V) and A0 toggle, allowing automated recognition by industry-standard programmers. Programming requires VPP = 13.0V ±0.25V and VCC = 6.5V ±0.25V, with a verified 100µs ±5% PGM pulse width per word.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1,048,576-bit (64K × 16) OTP EPROM - supports full 16-bit data bus interface without byte-lane splitting |
| Read access time | 45ns max - eliminates WAIT states in 5MHz+ microprocessor systems |
| Supply voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary supplies required |
| Active current | 30mA max at 5MHz - enables stable operation under sustained read load without thermal derating |
| Standby current | 100µA max - supports low-power hold modes in battery-backed or energy-sensitive systems |
| Programming speed | 100µs/word typical - reduces firmware burn time by >90% vs. legacy EPROMs |
| ESD protection | 2000V HBM - ensures robust handling during manual PCB assembly and rework |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
Pinout & Package
AT27C1024-45PU is supplied in a 40-lead plastic dual inline package (PDIP), 0.600" wide, JEDEC MS-011 compliant, with matte tin lead finish. Pin 1 identifier is marked by a notch or dot at the top-left corner of the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus interface; fully decoded internally - no external address latching required |
| O0–O15 | Data outputs | True bidirectional x16 data path; CMOS/TTL-compatible drive strength (IOH = –400µA, IOL = 2.1mA) |
| CE | Chip enable | Active-low global device select; controls power state transition between active and standby modes |
| OE | Output enable | Active-low output gate; allows multiple devices on same data bus without contention when CE is asserted |
| PGM | Program strobe | Active-low programming trigger; initiates 100µs internal write pulse when VPP = 13.0V and VCC = 6.5V |
| VPP | Programming voltage | 13.0V ±0.25V input for programming; must be applied simultaneously with or after VCC and removed simultaneously or before VCC |
| VCC | Power supply | 5V ±10% main supply; powers both logic and output drivers during read; elevated to 6.5V during programming |
| GND (pins 12 & 27) | Ground | Two dedicated ground pins required for noise immunity and current return path separation |
| NC (pins 11, 26, 32) | No connect | Internally unconnected; must remain floating - no external tie or pull-up/down |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100µs/word typical - cuts firmware update time versus 5–10ms/word legacy EPROMs |
| Integrated product ID code | Manufacturer ID (001Eh) and device code (00F1h) readable via A9/VH and A0 toggle - enables auto-programmer configuration |
| Two-line control (CE/OE) | Independent chip and output gating - permits interleaved access and clean bus release without external logic |
| High-reliability process | 200mA latchup immunity and 2000V ESD - meets industrial handling and long-term field reliability requirements |
| Green packaging option | Pb/halide-free PDIP - complies with RoHS Directive 2011/65/EU without performance trade-offs |
Applications
| Industrial PLC Firmware Storage | Automotive Engine Control Unit (ECU) Boot ROM |
|---|---|
Use Scenario: Storing immutable boot firmware and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile x16 memory mapped directly to CPU address/data bus; provides deterministic 45ns read latency for real-time instruction fetch. Use Value: Eliminates reliance on slower serial EEPROM or flash; avoids WAIT states in 80C188/80C186-based control engines. | Use Scenario: Holding engine startup routines and safety-critical lookup tables in Tier-1 automotive ECUs operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: OTP EPROM used as primary boot ROM; accessed during cold start prior to RAM initialization or flash controller bring-up. Use Value: Guarantees bit-level integrity over 15+ year vehicle lifetime; immune to radiation-induced bit flips unlike SRAM or DRAM. |
| Medical Diagnostic Instrument BIOS | Military Communications Radio Firmware |
Use Scenario: Storing certified diagnostic firmware and hardware initialization sequences in FDA-regulated imaging equipment requiring traceable, unalterable code. IC Role / Device Role / Timing Role: Read-only memory providing secure, tamper-evident boot image; accessed via 16-bit ISA-compatible bus during power-on self-test. Use Value: One-time programmability prevents unauthorized runtime modification; 2000V ESD rating withstands clinical environment handling. | Use Scenario: Hosting encrypted radio protocol stacks and cryptographic keys in ruggedized HF/VHF transceivers deployed in field-deployed tactical radios. IC Role / Device Role / Timing Role: High-reliability OTP memory serving as trusted execution root; interfaces directly to TI TMS320C54x DSP address bus. Use Value: Latchup immunity (200mA) ensures operation under EMI-heavy battlefield conditions; green packaging meets MIL-STD-202G material compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512B-45PU | 512K-bit (32K × 16); identical 45ns timing, same PDIP-40 package, but half capacity | Limited to smaller firmware images; insufficient for full 64K code+data partitions | Select only when firmware footprint ≤ 256KB and board layout re-use is critical |
| MX27C1024-45PC | Pin-compatible 64K × 16 OTP EPROM; 45ns access, same PDIP-40; requires 12.5V VPP (not 13.0V) | Same system integration effort; minor programmer voltage adjustment needed | Valid drop-in alternative where Atmel supply continuity is constrained; verify VPP tolerance in existing programmer |
Compared with AT27C512B-45PU and MX27C1024-45PC, the AT27C1024-45PU uniquely balances full 64K × 16 capacity, guaranteed 45ns timing, and Atmel's integrated ID code - making it optimal for new designs requiring firmware scalability and automated programming validation.
Availability
AT27C1024-45PU is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical diagnostics, and military comms requiring stable component supply, long-life obsolescence management, and RoHS-compliant through-hole manufacturing.
Supply support for AT27C1024-45PU 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs for industrial, automotive, and communications markets.
The AT27C1024 product line was engineered for high-reliability, one-time programmable firmware storage in resource-constrained embedded systems where flash endurance, wear leveling, or software-based updates are undesirable or unsafe.
FAQ
What is the maximum operating frequency supported by the AT27C1024-45PU?
The AT27C1024-45PU does not operate at a clock frequency itself, but its 45ns read access time supports reliable interfacing with microprocessors running up to 5MHz bus cycles. At that rate, the device delivers full 16-bit words without WAIT states, as confirmed by tACC ≤ 45ns and ICC ≤ 30mA under 5MHz read conditions per the official Atmel datasheet (0019N–EPROM–4/11).
Can the AT27C1024-45PU be reprogrammed after initial programming?
No, the AT27C1024-45PU is a one-time programmable (OTP) EPROM. Once programmed, its memory cells cannot be erased or rewritten. This design ensures firmware immutability and long-term data retention - critical for safety-critical applications like automotive ECUs and medical instruments where accidental or malicious code alteration must be physically impossible.
What is the purpose of the VPP pin on the AT27C1024-45PU, and what voltage must be applied?
The VPP pin on the AT27C1024-45PU supplies the high-voltage programming signal. During rapid programming, VPP must be set to 13.0V ±0.25V while VCC is raised to 6.5V ±0.25V. VPP is unused and may be tied to VCC during normal read operation. Applying incorrect VPP voltage or sequencing (e.g., VPP before VCC) risks programming failure or device damage, as specified in Table 5-6 and Figure 5-4 of the AT27C1024-45PU datasheet.
Does the AT27C1024-45PU support both CMOS and TTL logic families?
Yes, the AT27C1024-45PU features CMOS- and TTL-compatible inputs and outputs. Input thresholds meet VIH ≥ 2.0V and VIL ≤ 0.8V; output drive strength satisfies IOH = –400µA at VOH ≥ 2.4V and IOL = 2.1mA at VOL ≤ 0.4V - ensuring interoperability with legacy 74LS, 74HC, and modern microcontroller GPIOs without level-shifting circuitry.
How is the product identification code accessed on the AT27C1024-45PU?
The AT27C1024-45PU integrated product ID is accessed by asserting A9 at 12.0V ±0.5V (VID) while holding A1–A15 low, then toggling A0: low selects the manufacturer ID (001Eh), high selects the device code (00F1h). This feature is used by automated programmers to auto-detect part type and apply correct algorithms - eliminating manual setup errors during high-volume firmware burn operations.
AT27C1024-45PU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C1024-45PU FAQ
1.How can I place an order for AT27C1024-45PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-45PU 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 AT27C1024-45PU reliable?
The price and inventory of AT27C1024-45PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-45PU is usually 5 days.
3.What payment methods are accepted for AT27C1024-45PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-45PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-45PU?
AT27C1024-45PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-45PU 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 AT27C1024-45PU?
For technical support, including AT27C1024-45PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-45PU requirements.
6.How does Aetrix verify that AT27C1024-45PU is sourced from the original manufacturer or authorized distributors?
All AT27C1024-45PU 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 AT27C1024-45PU meets industry standards.
7.What is the process for return or replacement of AT27C1024-45PU?
All AT27C1024-45PU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-45PU, 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 AT27C1024-45PU part is unused and in its original packaging.
Return procedure for AT27C1024-45PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C1024-45PU Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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