My Inquiry
My Account
Microchip Technology AT27C1024-70JU-T
- Part No.:
- AT27C1024-70JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-70JU-T.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C1024-70JU-T from Atmel is a 1,048,576-bit (64K × 16) one-time programmable EPROM optimized for 16-/32-bit microprocessor systems. It delivers 70 ns read 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 AT27C1024-70JU-T datasheet, AT27C1024-70JU-T pinout, AT27C1024-70JU-T application, or AT27C1024-70JU-T equivalent, key selection criteria include fast x16 parallel read timing, rapid 100 µs/word programming, CMOS/TTL compatibility, integrated product identification code, and dual-line control (CE/OE) for bus contention avoidance in high-speed embedded firmware storage.
Technical Context
The AT27C1024-70JU-T implements a two-control-line interface (CE and OE) enabling precise output gating and eliminating bus contention during read cycles. Its x16 data bus architecture directly interfaces with 16-bit address/data buses without external multiplexing or wait-state insertion.
It features rapid programming with 100 µs/word pulse width at VCC = 6.5 V and VPP = 13.0 V, verified per address via iterative reprogramming up to 10 pulses. Product identification is accessed by asserting A9 at 12.0 V while toggling A0 - a hardware-level device-manufacturer code readout used by industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 1,048,576-bit (64K × 16) OTP EPROM - supports full 16-bit word fetches for efficient firmware execution in microprocessor systems |
| Read access time | 70 ns max - eliminates need for WAIT states in 5 MHz bus systems |
| Supply voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Standby current | 100 µA max - enables low-power retention in battery-backed or intermittent operation scenarios |
| Active current | 30 mA max at 5 MHz - defines thermal and power delivery requirements for sustained read bursts |
| Programming voltage | VPP = 12.0 V ±0.5 V - requires dedicated high-voltage programming circuitry; not compatible with standard 5 V-only systems |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications |
Pinout & Package
AT27C1024-70JU-T is packaged 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), dual enable controls (CE, OE), program strobe (PGM), high-voltage programming supply (VPP), and dual ground pins requiring connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus interface; selects one of 64K memory locations for read or program access |
| O0–O15 | Data outputs | 16-bit parallel data bus; driven only when CE = OE = low; high-impedance otherwise |
| CE | Chip enable | Primary device select; must be low for read or program operations; disables outputs when high |
| OE | Output enable | Secondary gating signal; controls output driver activation independently of CE to manage bus contention |
| PGM | Program strobe | Active-low pulse input that triggers 100 µs programming cycle when VPP is asserted and CE is low |
| VPP | Programming voltage | 12.0 V ±0.5 V input required only during programming; must be applied simultaneously with or after VCC |
| NC | No connect | Unbonded pins (positions 3, 19, 20, 32, 41); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100 µs/word typical programming time with auto-verify loop - reduces firmware update cycle time and improves production throughput |
| Integrated product ID code | Manufacturer (001Eh) and device type (00F1h) codes readable via A9/VH and A0 toggle - enables automatic algorithm selection in universal programmers |
| Two-line control (CE/OE) | Independent chip and output enable signals - allows flexible bus arbitration and eliminates data bus conflicts in multi-device systems |
| CMOS/TTL-compatible I/O | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - ensures interoperability with legacy 5 V logic families without level-shifting |
| ESD and latchup robustness | 2000 V HBM ESD rating and 200 mA latchup immunity - enhances reliability in handling-sensitive industrial assembly environments |
Applications
| Industrial PLC Firmware Storage | Automotive Engine Control Unit (ECU) Boot ROM |
|---|---|
Use Scenario: Storing fixed boot code and calibration tables in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile firmware storage device providing deterministic 70 ns read access to initialize CPU and I/O peripherals at power-up. Use Value: Eliminates WAIT states in 5 MHz backplane buses, ensuring sub-100 ns instruction fetch latency critical for real-time cyclic scan execution. | Use Scenario: Holding immutable engine management firmware in automotive ECUs where reprogramming is infrequent but field reliability is mandatory. IC Role / Device Role / Timing Role: One-time programmable ROM delivering tamper-resistant, radiation-tolerant code storage with industrial temperature qualification. Use Value: –40°C to +85°C operation and 2000 V ESD protection ensure functional integrity in under-hood environments subject to thermal cycling and electrical noise. |
| Military Communications Baseband Processor | Medical Imaging System Boot Loader |
Use Scenario: Storing trusted boot firmware for FPGA-based digital signal processors in secure radio transceivers. IC Role / Device Role / Timing Role: Secure, non-rewritable memory holding cryptographic initialization vectors and hardware root-of-trust code. Use Value: OTP architecture prevents accidental or malicious firmware overwrite; rapid 100 µs/word programming enables efficient pre-deployment provisioning. | Use Scenario: Hosting diagnostic self-test routines and minimal boot loader in MRI or CT scanner mainboards requiring certified long-term data retention. IC Role / Device Role / Timing Role: High-reliability firmware repository with guaranteed 10-year data retention and latchup immunity against transient surges. Use Value: 200 mA latchup immunity and green (Pb/halide-free) packaging meet IEC 60601-1 safety and environmental compliance for Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70PU | 512K-bit (64K × 8) capacity; 40-pin PDIP only; no VPP pin - uses internal charge pump for programming | Supports 8-bit data buses only; lacks x16 interface and PLCC option; lower density limits firmware complexity | Select when system uses 8-bit microcontrollers and board layout constraints favor DIP packages |
| MX27C1024PC-70 | Same 64K × 16 organization and 70 ns speed; 44-pin PLCC; requires external 12.5 V VPP; identical pinout and AC timing | Drop-in replacement in most designs; same industrial temp grade and programming algorithm; minor differences in ID code structure | Preferred for second-source assurance where Atmel supply continuity is a concern; verified pin-compatible with AT27C1024-70JU-T |
Compared with AT27C1024-70JU-T, AT27C512-70PU offers lower density and narrower bus width, limiting use in modern 16-bit systems, while MX27C1024PC-70 provides true pin-to-pin compatibility and identical timing - making it the strongest functional alternative for footprint-constrained industrial designs.
Availability
AT27C1024-70JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU boot ROM, military communications baseband processor, and medical imaging system boot loader applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C1024-70JU-T 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) designed high-performance, low-power nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets before its 2016 acquisition.
The AT27C1024 product line delivers high-density, one-time programmable EPROMs optimized for deterministic firmware storage in 16-/32-bit embedded systems where code immutability, fast parallel read access, and industrial temperature resilience are essential.
FAQ
What is the maximum read access time specified for the AT27C1024-70JU-T?
The AT27C1024-70JU-T has a maximum read access time of 70 ns under industrial temperature conditions (–40°C to +85°C) and 5 V ±10% supply, measured as tACC (address to output delay) with CE and OE both asserted low. This value is guaranteed across the full operating range and eliminates the need for WAIT states in 5 MHz bus systems. The AT27C1024-70JU-T achieves this performance using a dedicated x16 parallel architecture and optimized CMOS decoding.
Does the AT27C1024-70JU-T require a separate programming voltage, and if so, what is its specification?
Yes, the AT27C1024-70JU-T requires a dedicated programming voltage (VPP) of 12.0 V ±0.5 V applied to pin 31 during programming. This voltage must be applied simultaneously with or after VCC and removed simultaneously with or before VCC. VPP is not used during normal read operation. The AT27C1024-70JU-T relies on this external high-voltage source to enable Fowler-Nordheim tunneling for OTP cell programming, and its absence prevents any write or verify activity.
Can the AT27C1024-70JU-T be used in automotive applications?
The AT27C1024-70JU-T is rated for industrial temperature range (–40°C to +85°C) and is not qualified for automotive AEC-Q100 standards. While it may function in some under-dash environments, Atmel's official documentation explicitly states that its products are "not intended, authorized, or warranted for use as components in applications intended to support or sustain life" or in automotive contexts unless specifically designated. For automotive use, designers should select AEC-Q100-qualified alternatives instead of the AT27C1024-70JU-T.
How does the integrated product identification code work in the AT27C1024-70JU-T?
The AT27C1024-70JU-T embeds a manufacturer ID (001Eh) and device ID (00F1h) accessible via hardware-level signaling: A9 is driven to 12.0 V (VH), while A0 is toggled between low and high to select either code. This feature enables universal programmers to auto-detect the part and load correct algorithms and voltages. The AT27C1024-70JU-T uses this mechanism exclusively - no software command or serial interface is involved.
What are the power consumption characteristics of the AT27C1024-70JU-T in standby and active modes?
In standby mode (CE high), the AT27C1024-70JU-T draws ≤100 µA maximum VCC current, with typical consumption below 10 µA. In active read mode at 5 MHz, it draws ≤30 mA maximum ICC, with typical draw around 15 mA. These values assume VPP = VCC during standby and proper decoupling (0.1 µF ceramic + 4.7 µF bulk capacitor). The AT27C1024-70JU-T achieves low standby current through deep CMOS sleep gating, making it suitable for intermittently powered systems.
AT27C1024-70JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- 70 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)
AT27C1024-70JU-T FAQ
1.How can I place an order for AT27C1024-70JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-70JU-T 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 AT27C1024-70JU-T reliable?
The price and inventory of AT27C1024-70JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-70JU-T is usually 5 days.
3.What payment methods are accepted for AT27C1024-70JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-70JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-70JU-T?
AT27C1024-70JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-70JU-T 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 AT27C1024-70JU-T?
For technical support, including AT27C1024-70JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-70JU-T requirements.
6.How does Aetrix verify that AT27C1024-70JU-T is sourced from the original manufacturer or authorized distributors?
All AT27C1024-70JU-T 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 AT27C1024-70JU-T meets industry standards.
7.What is the process for return or replacement of AT27C1024-70JU-T?
All AT27C1024-70JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-70JU-T, 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 AT27C1024-70JU-T part is unused and in its original packaging.
Return procedure for AT27C1024-70JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C1024-70JU-T 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…
