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Microchip Technology AT27C1024-70VI
- Part No.:
- AT27C1024-70VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C1024-70VI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,066
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Product details
Overview
AT27C1024-70VI from Microchip Technology (formerly Atmel) is a 1-Mbit one-time programmable EPROM organized as 64K × 16 bits, operating at 5V ±10%, with 70 ns maximum read access time and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), rapid programming (100 µs/word), and integrated product identification code for automated programming systems - used in firmware storage for legacy microprocessor-based industrial controllers.
For engineers reviewing the AT27C1024-70VI datasheet, AT27C1024-70VI pinout, AT27C1024-70VI application, or AT27C1024-70VI equivalent, this page delivers verified technical context, JEDEC-compliant package details, real-world timing behavior, and validated alternative options for firmware memory replacement in embedded systems requiring OTP reliability and 16-bit bus interface.
Technical Context
The AT27C1024-70VI implements a CMOS OTP EPROM architecture with address decoding for A0–A15, 16-bit bidirectional data outputs (O0–O15), and dedicated program control via PGM and VPP (13.0 V during programming). Its two-line enable logic (CE active-low, OE active-low) eliminates bus contention in high-speed 16-bit microprocessor buses.
It supports Rapid™ programming with 100 µs pulse width per word, requires VCC applied before VPP during programming, and embeds manufacturer/device identification codes accessible via A9 high-voltage (12.0 V) and A0 toggling - enabling automatic algorithm selection in industry-standard programmers.
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 bank switching |
| Read Access Time | 70 ns max - eliminates WAIT states in 14 MHz Z80 or 80C186-based systems |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required in read mode |
| Active Current | 30 mA max at 5 MHz - supports sustained burst reads in real-time control loops |
| Standby Current | 100 µA max (CMOS CE), 1 mA max (TTL CE) - suitable for low-power sleep modes in industrial HMIs |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires external high-voltage supply; not generated internally |
| ESD Protection | 2000 V HBM - ensures robustness during manual handling and board-level assembly |
Pinout & Package
AT27C1024-70VI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant. Both GND pins (Pin 12 and Pin 28) must be connected for stable operation.
| 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 | True 16-bit parallel output bus; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low global enable; controls device power state and output driver activation |
| OE | Output Enable | Active-low output gate; allows shared bus operation without disabling chip power |
| PGM | Program Strobe | Active-low pulse input (100 µs width) triggering single-word programming when VPP = 13 V |
| VPP | Programming Supply | 13.0 V input required only during programming; must be sequenced after VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and outputs; supplies current up to 30 mA in active read |
| GND | Ground | Two dedicated ground pins (12 and 28); both must be connected to minimize noise and ensure timing compliance |
| NC | No Connect | Pin 22 (PDIP) is unconnected - must remain floating or grounded per PCB layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time enables <1-second full-device programming - critical for high-throughput manufacturing test |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F1h) readable via A9=12 V and A0 toggle - eliminates manual programmer setup errors |
| Two-Line Control (CE/OE) | Independent chip and output enables allow seamless integration into multiplexed 16-bit data buses without bus transceivers |
| JEDEC-Standard Packages | Available in PDIP (40P6), PLCC (44J), and VSOP (40V) - supports legacy socketing, surface-mount rework, and space-constrained designs |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2000 V ESD rating ensure field reliability in electrically noisy industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot ROM |
|---|---|
|
Use Scenario: Storing fixed boot firmware and motion control algorithms in DIN-rail mounted programmable logic controllers with Z80 or 80C186 CPUs. IC Role / Device Role / Timing Role: Primary nonvolatile program memory providing 16-bit instruction/data fetch with ≤70 ns latency to sustain deterministic scan cycles. Use Value: Eliminates need for external WAIT-state generators; 64K × 16 organization matches native bus width of target MCUs, reducing glue logic. |
Use Scenario: Holding certified diagnostic firmware in Class II medical analyzers where firmware immutability and long-term data retention are mandated. IC Role / Device Role / Timing Role: OTP EPROM serving as tamper-resistant, revision-locked boot ROM accessed during cold start and safety self-test sequences. Use Value: One-time programmability prevents accidental or malicious firmware overwrite; industrial temp grade ensures operation across clinic HVAC ranges. |
| Avionics Maintenance Terminal BIOS | Test Equipment PROM Emulation |
|
Use Scenario: Providing configuration and calibration data storage in portable avionics ground support equipment operating in hangar environments. IC Role / Device Role / Timing Role: Read-only memory mapped at fixed address space, delivering initialization code within strict 70 ns timing budget for MIL-STD-1553 interface controllers. Use Value: PDIP packaging enables socketed field replacement; 5 V compatibility avoids level-shifting in legacy 1553 subsystems. |
Use Scenario: Replacing obsolete 27C512 EPROMs in automated circuit board testers requiring firmware updates between product variants. IC Role / Device Role / Timing Role: Drop-in upgrade path offering double the density (1 Mbit vs. 512 Kbit) while retaining identical pinout and timing interface for existing tester sockets. Use Value: Direct upgrade capability reduces hardware redesign cost; same 40-pin PDIP footprint allows reuse of existing test fixtures and burn-in boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-70VI | 4-Mbit (256K × 16), same 70 ns speed, but requires VPP = 12.5 V and has different identification code structure | Higher density supports larger firmware images; incompatible ID read protocol prevents use with legacy programmers calibrated for AT27C1024 | Select only if firmware size exceeds 64K words and programming infrastructure supports AT27C040-specific ID verification |
| AM27C1024-70DC | Functionally identical 1-Mbit OTP EPROM, but manufactured by AMD (now part of Advanced Micro Devices); same pinout, timing, and programming specs | No change in system integration; however, AM27C1024 uses different wafer lot traceability and may exhibit minor parametric variation in standby current (±10%) | Valid second-source option where dual-sourcing is required; verify qualification reports for automotive-grade versions if used in vehicle diagnostics tools |
Compared with AT27C1024-70VI, AT27C040-70VI offers quadruple capacity but demands updated programming firmware, while AM27C1024-70DC provides identical electrical behavior with alternate supply chain provenance - making it the preferred drop-in alternative for continuity planning.
Availability
AT27C1024-70VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot ROM, and avionics maintenance terminal BIOS requiring stable component supply across extended production lifecycles.
Supply support for AT27C1024-70VI 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel memory products including the AT27C series. The company specializes in secure, reliable microcontrollers and nonvolatile memory solutions for industrial and automotive markets.
The AT27C1024 belongs to Atmel's OTP EPROM product line, designed specifically for firmware storage in cost-sensitive, high-reliability embedded systems where write-once permanence and JEDEC-standard compatibility are mandatory.
FAQ
What is the operating temperature range for AT27C1024-70VI?
The AT27C1024-70VI is rated for industrial temperature operation from –40°C to +85°C. This range is confirmed in the Ordering Information table on page 10 of the datasheet, where the "-70VI" suffix explicitly denotes the industrial grade variant. The device meets all DC and AC specifications across this full range, including 70 ns access time and 100 µA max standby current. AT27C1024-70VI is not qualified for automotive (–40°C to +125°C) or extended commercial (0°C to +70°C only) grades.
Does AT27C1024-70VI require an external high-voltage supply for normal read operation?
No, AT27C1024-70VI operates in read mode using only a single 5 V ±10% supply (VCC). VPP is required exclusively during programming - at 13.0 V ±0.25 V - and must be applied only when PGM is asserted. During all read, standby, and output-disable modes, VPP can be tied to VCC or left unconnected per design; the datasheet confirms VPP = VCC is valid for standby current specification (ISB1/ISB2).
Can AT27C1024-70VI be used as a direct replacement for AT27C516 in existing designs?
Yes, AT27C1024-70VI is documented as a direct upgrade from the 512K-bit AT27C516. Both share identical 40-pin PDIP (40P6) packaging, 16-bit data bus (O0–O15), and compatible control signaling (CE/OE/PGM). The AT27C1024-70VI retains the same pinout and timing interface, allowing reuse of PCB footprints and socketing - though firmware must be recompiled to utilize the doubled address space (A16 implied via higher-density mapping).
How is the product identification code read from AT27C1024-70VI?
The AT27C1024-70VI identification code is read by applying 12.0 V ±0.5 V to A9 (VID = 11.5–12.5 V), holding A1–A15 low, and toggling A0: low selects the Manufacturer ID (001Eh), high selects the Device Code (00F1h). This mode is entered with CE = OE = VIL and VPP = VCC. The outputs O0–O15 reflect the 16-bit code directly - a feature used by programmers like Data I/O PS-28 to auto-detect device type and select correct algorithms.
What decoupling capacitance is required for stable operation of AT27C1024-70VI?
Per the System Considerations section (page 2), AT27C1024-70VI requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point. These values are mandatory to suppress transient excursions during CE transitions and ensure compliance with absolute maximum ratings - failure to implement them risks non-conformance under dynamic load conditions.
AT27C1024-70VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT27C1024-70VI FAQ
1.How can I place an order for AT27C1024-70VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-70VI 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 AT27C1024-70VI reliable?
The price and inventory of AT27C1024-70VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-70VI is usually 5 days.
3.What payment methods are accepted for AT27C1024-70VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-70VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-70VI?
AT27C1024-70VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-70VI 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 AT27C1024-70VI?
For technical support, including AT27C1024-70VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-70VI requirements.
6.How does Aetrix verify that AT27C1024-70VI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-70VI 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 AT27C1024-70VI meets industry standards.
7.What is the process for return or replacement of AT27C1024-70VI?
All AT27C1024-70VI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-70VI, 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 AT27C1024-70VI part is unused and in its original packaging.
Return procedure for AT27C1024-70VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C1024-70VI Tags
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