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Microchip Technology AT27C1024-70JC
- Part No.:
- AT27C1024-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-70JC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
AT27C1024-70JC from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM in 40-lead PDIP package, featuring 70 ns read access time, 5V ±10% supply, and dual-line control (CE/OE) for bus contention avoidance. It serves as firmware storage in 16-/32-bit microprocessor systems requiring nonvolatile, pin-compatible upgrade from AT27C516.
For engineers reviewing the AT27C1024-70JC datasheet, AT27C1024-70JC pinout, AT27C1024-70JC application, or AT27C1024-70JC equivalent, key selection factors include verified 70 ns tACC timing, VPP-programming compatibility at 12.0 V ±0.5 V, GND pin pairing requirement, and JEDEC-standard PDIP mechanical footprint.
Technical Context
The AT27C1024-70JC implements a CMOS OTP EPROM architecture with address decoding for A0–A15 and 16-bit bidirectional data outputs O0–O15. Its two-line enable logic (CE active-low, OE active-low) enables high-speed read operation without bus contention, while PGM and VPP pins support rapid 100 µs/word programming under 13.0 V ±0.25 V.
It integrates product identification via A9 voltage sensing (11.5–12.5 V) and A0 toggling to select manufacturer/device codes, and includes ESD protection (2000 V) and latchup immunity (200 mA), meeting commercial temperature range (0°C to 70°C) requirements with 100 µA max standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16 organization) |
| Read Access Time (tACC) | 70 ns maximum - eliminates WAIT states in 5 MHz microprocessor buses |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails |
| Programming Voltage (VPP) | 12.0 V ±0.5 V - required only during programming; must be applied after VCC |
| Standby Current (ISB1) | 100 µA max (CMOS CE input) - enables low-power firmware retention |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded control applications |
| Package | 40-lead PDIP (0.600" wide, JEDEC MS-011 AC) - through-hole mounting, socket-compatible |
Pinout & Package
AT27C1024-70JC is housed in a 40-lead plastic dual in-line package (PDIP), 0.600" wide, with dual GND pins (pins 10 and 24) requiring connection per datasheet note. Pin numbering follows standard JEDEC top-view convention.
| 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 output bus; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low global chip select; controls device activation and standby entry |
| OE | Output Enable | Active-low output gate; enables data drivers independently of CE |
| PGM | Program Strobe | Active-low pulse input (100 µs width) initiating word programming cycle |
| VPP | Programming Supply | 12.0 V ±0.5 V input required only during programming; must be sequenced with VCC |
| NC | No Connect | Pin 22 (PDIP) is unconnected - must remain floating, not tied to any net |
| GND (Pins 10 & 24) | Ground Reference | Both pins must be connected to system ground to ensure stable operation and EMI control |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and output drivers in read mode |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time - reduces firmware burn-in cycle duration by >90% vs legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F1h) readable via A9/A0 voltage sequencing - enables automated programmer validation |
| Two-Line Control Architecture | Independent CE and OE inputs - allows memory-mapped I/O and partial bus sharing without external gating logic |
| High-Reliability CMOS Process | 2000 V HBM ESD rating and 200 mA latchup immunity - ensures robustness in industrial handling and board assembly |
| JEDEC-Standard Packaging | 40P6 PDIP footprint - supports drop-in replacement for legacy 27C-series EPROMs and socket-based prototyping |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware repository accessed at power-on reset; 70 ns tACC meets deterministic scan-cycle timing budgets. Use Value: Eliminates need for external wait-state generators; dual GND pins reduce ground bounce in noisy 24 V DC control cabinets. | Use Scenario: Providing immutable BIOS or monitor code for 16-bit microcontrollers (e.g., Intel 80C186) in medical diagnostic equipment. IC Role / Device Role / Timing Role: Read-only instruction memory mapped to upper address space; CE/OE decoupling prevents bus conflicts during DMA transfers. Use Value: Direct upgrade path from AT27C516 preserves PCB layout; 5 V ±10% tolerance accommodates aging power supplies. |
| Automotive Instrument Cluster Calibration Data | Test Equipment Microcode Repository |
Use Scenario: Holding calibrated display parameters and sensor compensation tables in automotive dashboards certified to AEC-Q100 Class 2. IC Role / Device Role / Timing Role: Static configuration store accessed during startup; programmed once at final test using VPP-controlled algorithm. Use Value: Rapid™ programming enables high-throughput calibration; integrated ID code verifies correct part loading in automated test handlers. | Use Scenario: Hosting firmware microcode for benchtop oscilloscopes and logic analyzers requiring field-upgradable feature sets. IC Role / Device Role / Timing Role: Off-chip instruction store for RISC co-processors; accessed via burst reads with tOE = 35 ns enabling pipelined execution. Use Value: VSOP/PLCC/PDIP package options allow same firmware image across multiple hardware revisions; 100 µA standby current extends battery-backed operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-70PC | Same die, identical timing and programming specs; differs only in PDIP lead finish (matte tin vs. hot-solder dipped) | Identical functional use; matte tin preferred for RoHS-compliant reflow, while hot-solder dipped suits wave soldering | Select AT27C1024-70PC if lead-free assembly is required; AT27C1024-70JC remains optimal for legacy through-hole production. |
| AT27C1024-70VI | Same core functionality but in 40-lead VSOP package (10 mm × 14 mm); operates over -40°C to +85°C industrial range | Enables compact PCB layouts and extended temperature operation; requires different footprint and reflow profile | Choose AT27C1024-70VI for space-constrained or extended-temperature designs; AT27C1024-70JC is best for socket-based development and commercial-temp systems. |
Compared with AT27C1024-70PC and AT27C1024-70VI, the AT27C1024-70JC offers verified hot-solder-dipped leads for reliable wave soldering, maintains full pinout and timing compatibility with legacy 27C sockets, and delivers identical 70 ns read performance within the commercial temperature grade - making it the reference choice for prototyping and volume through-hole manufacturing.
Availability
AT27C1024-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, and automotive instrument cluster calibration data requiring stable component supply, long-term obsolescence management, and JEDEC-standard PDIP compatibility.
Supply support for AT27C1024-70JC 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 semiconductor innovator specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C1024 product line delivers high-reliability OTP EPROMs optimized for firmware storage in resource-constrained 16-/32-bit systems where code immutability, fast read access, and JEDEC-standard packaging are critical design requirements.
FAQ
What is the maximum allowable VPP voltage for programming the AT27C1024-70JC?
The AT27C1024-70JC requires VPP = 12.0 V ±0.5 V during programming, with absolute maximum rating of +14.0 V. Exceeding 12.5 V risks permanent damage to the oxide layer; programming equipment must regulate VPP tightly and sequence it after VCC application. The AT27C1024-70JC datasheet specifies VID = 11.5–12.5 V for product identification, confirming this voltage window is fundamental to its OTP operation.
Does the AT27C1024-70JC support read operations while VPP is connected to VCC?
Yes - the AT27C1024-70JC supports normal read mode with VPP tied to VCC (5 V), as confirmed by ISB1/ISB2 standby current specs and AC read timing tables. However, VPP must be raised to 12.0 V ±0.5 V only during programming; leaving it at 5 V during read ensures no unintended program disturb and matches the "VPP = VCC" condition used in ICC and ISB characterization.
How many GND connections does the AT27C1024-70JC require, and why?
The AT27C1024-70JC requires two dedicated GND connections: Pin 10 and Pin 24 on the 40-lead PDIP package. This dual-ground design reduces ground impedance, minimizes noise coupling between address and data paths, and ensures stable operation under fast switching conditions - a requirement explicitly stated in the "Pin Configurations" section and reinforced by ESD/latchup immunity specs.
Can the AT27C1024-70JC be used as a direct replacement for AT27C516 in existing designs?
Yes - the AT27C1024-70JC is documented as a direct upgrade from the 512K AT27C516, sharing identical pinout, voltage levels, and control signaling (CE/OE/PGM). Its 64K × 16 organization doubles capacity while maintaining backward compatibility; no PCB changes are needed beyond verifying VPP sequencing and adding the extra address lines (A16–A15 are unused in AT27C516 but fully supported here).
What is the purpose of the NC pin on the AT27C1024-70JC PDIP package?
Pin 22 on the AT27C1024-70JC PDIP package is designated NC (No Connect) and must remain unconnected - neither grounded nor tied to VCC. This pin corresponds to a non-bonded die pad and has no internal circuit connection; routing or soldering to it may cause parasitic coupling or violate JEDEC mechanical clearance rules, potentially impacting timing or reliability.
AT27C1024-70JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- 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:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C1024-70JC FAQ
1.How can I place an order for AT27C1024-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-70JC 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 AT27C1024-70JC reliable?
The price and inventory of AT27C1024-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-70JC is usually 5 days.
3.What payment methods are accepted for AT27C1024-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-70JC?
AT27C1024-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-70JC 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 AT27C1024-70JC?
For technical support, including AT27C1024-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-70JC requirements.
6.How does Aetrix verify that AT27C1024-70JC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-70JC 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 AT27C1024-70JC meets industry standards.
7.What is the process for return or replacement of AT27C1024-70JC?
All AT27C1024-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-70JC, 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 AT27C1024-70JC part is unused and in its original packaging.
Return procedure for AT27C1024-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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