My Inquiry
My Account
Microchip Technology AT27C1024-45JU
- Part No.:
- AT27C1024-45JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-45JU.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:177
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C1024-45JU from Atmel is a 1,048,576-bit (64K × 16) one-time programmable EPROM optimized for high-speed read access in 16-/32-bit microprocessor systems. It delivers 45ns access time, operates on a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 44-lead PLCC package.
For engineers reviewing the AT27C1024-45JU datasheet, AT27C1024-45JU pinout, AT27C1024-45JU application, or AT27C1024-45JU equivalent, key selection criteria include fast read timing, CMOS/TTL compatibility, rapid 100µs/word programming, integrated product identification code, and dual-line control (CE/OE) for bus contention avoidance in embedded firmware storage.
Technical Context
The AT27C1024-45JU implements a two-control-line architecture (CE and OE) enabling precise output gating and eliminating bus contention during high-speed system operation. Its x16 data bus organization directly interfaces with 16-bit address/data buses without external multiplexing.
It features rapid programming with 100µs/word typical pulse width at VPP = 13.0V and VCC = 6.5V, followed by verify-reprogram loops per word. Product identification is accessed via A9 = 12.0V and A0 toggling, returning manufacturer (001Eh) and device code (00F1h) words.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 1,048,576-bit (64K × 16), enabling full firmware image storage for mid-complexity microcontrollers |
| Read access time | 45ns max - eliminates WAIT states in 5MHz CPU systems |
| Supply voltage | 5V ±10% - compatible with standard logic rails; no auxiliary supplies required |
| Active current | 30mA max at 5MHz - supports sustained read bursts without thermal derating |
| Standby current | 100µA max - enables low-power retention in battery-backed or intermittent-access systems |
| Programming speed | 100µs/word typical - reduces production programming cycle time vs. legacy EPROMs |
| ESD protection | 2000V HBM - ensures robust handling during board assembly and field service |
Pinout & Package
AT27C1024-45JU is housed in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 compliant, with 16 address inputs (A0–A15), 16 bidirectional data outputs (O0–O15), CE/OE/PGM controls, VCC, VPP, GND, and NC terminals. Both GND pins must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus interface; fully decoded to select one of 64K words |
| O0–O15 | Data outputs | 16-bit parallel data bus; CMOS/TTL-compatible drive strength (IOL = 2.1mA, IOH = –400µA) |
| CE | Chip enable | Primary device selection; must be low for read or program operations |
| OE | Output enable | Secondary gating signal; controls output buffer tri-state to prevent bus contention |
| PGM | Program strobe | Active-low pulse input triggering 100µs programming cycle when VPP = 13.0V |
| VPP | Programming voltage | 13.0V ±0.25V supply required only during programming; must be applied simultaneously with VCC |
| NC | No connect | Unbonded pins (positions 3, 19, 20, 32, 33); must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100µs/word typical pulse width with verify-reprogram loop - cuts programming time by >5× vs. conventional EPROMs |
| Integrated product ID code | Manufacturer (001Eh) and device (00F1h) codes accessible via A9 = 12.0V and A0 toggle - enables automatic algorithm selection in production programmers |
| Two-line control (CE/OE) | Independent chip and output enable - allows flexible bus arbitration and eliminates contention in multi-device systems |
| Green Pb/halide-free packaging | RoHS-compliant 44J PLCC package - meets environmental compliance requirements without performance trade-offs |
| High-reliability process | 200mA latchup immunity and 2000V ESD protection - ensures stable operation in noisy industrial environments |
Applications
| Industrial PLC Firmware Storage | Automotive Instrument Cluster Boot ROM |
|---|---|
Use Scenario: Storing fixed boot code and calibration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Non-volatile firmware storage with deterministic 45ns read latency, ensuring real-time response to I/O interrupts without CPU wait-state insertion. Use Value: Eliminates reliance on slower serial EEPROM or flash; avoids wear-out mechanisms inherent in reprogrammable media while delivering guaranteed read reliability over 10+ years. | Use Scenario: Holding immutable startup routines and gauge driver firmware in automotive instrument clusters certified for –40°C to +85°C operation. IC Role / Device Role / Timing Role: OTP EPROM providing tamper-resistant, radiation-tolerant boot memory with 12.0V-programmable ID verification for anti-counterfeit traceability. Use Value: Meets AEC-Q100 stress requirements via 200mA latchup immunity and 2000V ESD rating; green packaging satisfies OEM RoHS mandates without redesign. |
| Legacy 16-bit Microprocessor Upgrade | Medical Diagnostic Equipment Configuration Memory |
Use Scenario: Direct replacement for AT27C516 (512K) in aging 16-bit embedded systems requiring higher density without PCB layout changes. IC Role / Device Role / Timing Role: Pin-compatible upgrade path offering 2× memory capacity (64K × 16 vs. 32K × 16) with identical PDIP/PLCC footprints and identical CE/OE timing. Use Value: Enables firmware expansion (e.g., added language support or diagnostics) without modifying existing board layouts or driver software. | Use Scenario: Storing FDA-cleared device configuration parameters and safety-critical initialization sequences in Class II medical imaging subsystems. IC Role / Device Role / Timing Role: One-time programmable, non-volatile memory with verified 10-year data retention and zero write endurance concerns - critical for audit-trail integrity. Use Value: Avoids flash wear-out risks in life-critical applications; rapid 100µs/word programming supports efficient final-test programming in regulated manufacturing lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-45PU | Same die, 40-lead PDIP package instead of 44J PLCC; identical AC/DC specs and timing | Preferred for through-hole prototyping or legacy wave-soldered boards where PLCC rework is impractical | Select when mechanical mounting or soldering process favors DIP over surface-mount PLCC |
| AM27C1024-45DC | AMD second-source version; same 45ns access, 64K×16 organization, and PLCC-44 package; minor differences in programming voltage tolerance (VPP = 12.5V ±0.5V) | Used in systems requiring multi-source procurement for long-term supply continuity | Choose for BOM diversification where Atmel sourcing risk exists; verify VPP stability margin in target programmer |
Compared with AT27C1024-45PU and AM27C1024-45DC, the AT27C1024-45JU offers identical core functionality but provides superior thermal dissipation and board space efficiency in surface-mount designs, making it optimal for high-density industrial control modules where reflow compatibility and footprint minimization are prioritized.
Availability
AT27C1024-45JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive instrument cluster boot ROM, legacy 16-bit microprocessor upgrades, and medical diagnostic equipment configuration memory requiring stable component supply across extended production lifecycles.
Supply support for AT27C1024-45JU 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) was a leading designer of microcontrollers, non-volatile memory, and analog semiconductors, known for high-reliability industrial and automotive-grade products.
The AT27C1024 series was developed as a high-speed, low-power OTP EPROM family targeting firmware storage in resource-constrained embedded systems where flash endurance or EEPROM write latency were unacceptable.
FAQ
What is the maximum operating temperature range for the AT27C1024-45JU?
The AT27C1024-45JU is rated for industrial temperature operation from –40°C to +85°C. This range is validated per JEDEC standards and applies to both read and standby modes. The device's 200mA latchup immunity and 2000V ESD protection ensure stable operation across this full range without derating. AT27C1024-45JU does not support extended automotive (–40°C to +125°C) or military temperature grades.
Does the AT27C1024-45JU require a separate programming voltage during normal operation?
No. The AT27C1024-45JU requires only a single 5V ±10% supply (VCC) for normal read and standby operation. VPP (13.0V ±0.25V) is needed exclusively during programming and must be applied simultaneously with VCC. During read mode, VPP may be tied to VCC; however, doing so increases standby current slightly. AT27C1024-45JU's design eliminates the need for dual-rail power supplies in deployed systems.
How does the AT27C1024-45JU handle bus contention in multi-device systems?
The AT27C1024-45JU prevents bus contention using independent CE (chip enable) and OE (output enable) controls. CE selects the device, while OE gates the output drivers - allowing multiple devices to share the same data bus without conflict. When OE is high, outputs enter high-impedance state regardless of CE status. This dual-gating architecture is explicitly designed for high-speed shared-bus systems and is confirmed in the AT27C1024-45JU datasheet's operating modes table.
Can the AT27C1024-45JU be used as a direct replacement for the AT27C516 EPROM?
Yes - the AT27C1024-45JU is specified as a direct upgrade from the AT27C516 (512K-bit). It shares identical pinouts in both 40-lead PDIP and 44-lead PLCC packages, uses the same 5V supply and CE/OE control logic, and maintains backward-compatible timing (tACC, tCE, tOE). The primary enhancement is doubled capacity (64K × 16 vs. 32K × 16), enabling seamless firmware expansion without hardware or software changes. AT27C1024-45JU retains all AT27C516 interface behaviors.
What is the purpose of the integrated product identification code in the AT27C1024-45JU?
The AT27C1024-45JU includes an integrated product identification code that returns two 16-bit words: manufacturer ID (001Eh) and device ID (00F1h). Accessed by setting A9 = 12.0V and toggling A0, this feature enables automated programming equipment to validate part authenticity and select correct algorithms/voltages. It supports traceability and anti-counterfeiting in high-reliability applications. The AT27C1024-45JU's ID code is electrically verified and documented in Table 5-8 of its datasheet.
AT27C1024-45JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C1024-45JU FAQ
1.How can I place an order for AT27C1024-45JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-45JU 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 AT27C1024-45JU reliable?
The price and inventory of AT27C1024-45JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-45JU is usually 5 days.
3.What payment methods are accepted for AT27C1024-45JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-45JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-45JU?
AT27C1024-45JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-45JU 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 AT27C1024-45JU?
For technical support, including AT27C1024-45JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-45JU requirements.
6.How does Aetrix verify that AT27C1024-45JU is sourced from the original manufacturer or authorized distributors?
All AT27C1024-45JU 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 AT27C1024-45JU meets industry standards.
7.What is the process for return or replacement of AT27C1024-45JU?
All AT27C1024-45JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-45JU, 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 AT27C1024-45JU part is unused and in its original packaging.
Return procedure for AT27C1024-45JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C1024-45JU 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…
