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Microchip Technology AT27C040-70TI
- Part No.:
- AT27C040-70TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C040-70TI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,508
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Product details
Overview
AT27C040-70TI from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM with 70 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), CMOS/TTL-compatible I/O, and integrated product identification code for automated programming. Used in legacy microprocessor boot memory and firmware storage where non-volatility and long-term data retention are critical.
For engineers reviewing the AT27C040-70TI datasheet, AT27C040-70TI pinout, AT27C040-70TI application, or AT27C040-70TI equivalent, key selection criteria include verified 70 ns tACC timing, VPP = 12.0 V programming voltage, JEDEC-standard 32-lead TSOP/PLCC/PDIP package compatibility, and industrial-grade standby current ≤100 µA.
Technical Context
The AT27C040-70TI implements a standard OTP EPROM architecture with address decoding for A0–A18 (19-bit addressing), 8-bit parallel data outputs (O0–O7), and two active-low control lines: Chip Enable (CE) and Output Enable (OE). Its Rapid™ Programming Algorithm uses 100 µs CE pulses at VPP = 13.0 V for byte-level programming.
It supports product identification via A9 high-voltage mode (VID = 11.5–12.5 V) and A0 toggling to select manufacturer (0x1E) or device code (0x0B). The device requires external decoupling: 0.1 µF ceramic capacitor between VCC and GND per device, plus 4.7 µF bulk capacitance for EPROM arrays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304-bit (512K × 8) - supports full 19-bit address space for boot ROM in 8-bit microcontrollers. |
| Read Access Time | 70 ns max (tACC) - enables direct interface to 14 MHz Z80 or 12.5 MHz 8086 without wait states. |
| Supply Voltage | 5V ±10% - compatible with legacy TTL/CMOS logic rails; no auxiliary voltage required for read mode. |
| Standby Current | 100 µA max (ISB1, CMOS CE) - ensures low power draw in idle systems such as industrial controllers. |
| Programming Voltage | VPP = 12.0 ±0.5 V - requires dedicated 12 V supply during programming; not used in normal read operation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and telecom line cards. |
| ESD Protection | 2000V HBM - meets MIL-STD-883 Class 3A for handling robustness in manufacturing and field repair. |
Pinout & Package
AT27C040-70TI is supplied in a 32-lead Plastic Thin Small Outline Package (TSOP), JEDEC MO-142 BD compliant, 8 mm × 20 mm footprint, 0.5 mm lead pitch. Pin 1 identifier is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decoded to select one of 524,288 bytes; A0 is LSB. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE is high. |
| CE | Chip Enable | Active-low global enable; must be low before OE to avoid bus contention in multiplexed systems. |
| OE | Output Enable | Active-low output gate; allows shared bus operation with other peripherals without tri-state conflicts. |
| VPP | Programming Voltage | 12 V input only during programming; must be applied after VCC and removed before VCC per sequencing rules. |
| VCC | Power Supply | +5 V main supply; powers internal logic and output drivers; requires local 0.1 µF ceramic decoupling. |
| GND | Ground Reference | Signal and power return; separate ground plane recommended for noise-sensitive applications. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces firmware update cycle time in production programming stations. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) readable via A9/VPP high-voltage mode - enables auto-detection in universal programmers. |
| Two-Line Control Architecture | Independent CE and OE inputs - eliminates bus contention in high-speed microprocessor buses with shared memory/data paths. |
| High Reliability CMOS Process | 200 mA latchup immunity and 2000 V ESD protection - ensures robust operation in electrically noisy industrial settings. |
| JEDEC-Standard Packages | 32-lead TSOP (32T), PLCC (32J), and PDIP (32P6) options - supports drop-in replacement across legacy PCB footprints. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers deployed in factory floors with wide ambient temperature swings. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; provides deterministic 70 ns read latency for real-time scan cycles. Use Value: Eliminates need for battery-backed SRAM or EEPROM wear leveling; retains firmware through power loss and thermal cycling. |
Use Scenario: Holding startup code and hardware initialization routines for 8051- or Z80-based embedded systems in medical analyzers and test equipment. IC Role / Device Role / Timing Role: Primary ROM in Harvard architecture; accessed during reset vector fetch with guaranteed tACC ≤70 ns. Use Value: Enables immediate execution post-power-up without delay loops or external wait-state generators. |
| Telecom Line Card Configuration | Avionics Maintenance Data Module |
|
Use Scenario: Storing protocol stacks and calibration tables in T1/E1 interface cards operating in telecom central offices. IC Role / Device Role / Timing Role: Static configuration memory accessed via memory-mapped I/O; CE/OE controlled by FPGA glue logic. Use Value: Provides tamper-proof, unalterable firmware image resistant to radiation-induced bit flips in long-life deployments. |
Use Scenario: Archiving aircraft sensor calibration coefficients and maintenance logs in flight data recorders certified to DO-160 environmental standards. IC Role / Device Role / Timing Role: Read-only data repository with industrial temp rating and 2000 V ESD tolerance for ground handling surges. Use Value: Meets avionics data integrity requirements without volatile memory refresh or write-cycle endurance limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-70DC | Same 4-Mbit size, 70 ns speed, and 5V supply; but uses AMD's process with higher 250 µA standby current and no integrated ID code. | Lacks A9-based product identification; requires manual algorithm selection in programming tools. | Choose AM27C040-70DC only if existing tooling supports its timing and lacks ID-code dependency. |
| MX27C4001-70PC | Pin-compatible 4-Mbit EPROM with identical 32-pin PDIP; 70 ns access but requires 12.5 V VPP and has 150 µA standby current. | Higher VPP tolerance (12.5 V vs. 12.0 V); slightly slower tOE (35 ns vs. 30 ns) affects high-frequency bus timing margins. | Select MX27C4001-70PC when sourcing from Macronix-certified programming infrastructure and board layout accommodates VPP margin. |
Compared with AM27C040-70DC and MX27C4001-70PC, the AT27C040-70TI offers lower industrial-grade standby current (100 µA), built-in ID code for automated programming, and tighter tOE (30 ns), making it preferable for power-constrained or high-volume production environments requiring traceability.
Availability
AT27C040-70TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and telecom line card configuration requiring stable component supply over extended product lifecycles.
Supply support for AT27C040-70TI 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 was a U.S.-based semiconductor company specializing in microcontrollers, non-volatile memory, and RF ICs before its acquisition by Microchip Technology in 2016.
The AT27C040-70TI belongs to Atmel's OTP EPROM product line, designed specifically for cost-sensitive, high-reliability embedded systems requiring immutable firmware storage without battery backup or rewrite endurance concerns.
FAQ
What is the maximum allowed VPP voltage for programming the AT27C040-70TI?
The AT27C040-70TI requires VPP = 12.0 ± 0.5 V during programming, with absolute maximum rating of +14.0 V. Exceeding 12.5 V risks oxide damage and premature cell failure. Programming equipment must enforce strict voltage regulation and sequencing-VCC must be applied before VPP and removed after VPP per datasheet Section 4. Always verify VPP stability with oscilloscope before batch programming the AT27C040-70TI.
Does the AT27C040-70TI support read operations at 3.3V?
No, the AT27C040-70TI is specified only for 5V ±10% supply operation in read mode. Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive levels (VOH ≥ 2.4 V at –400 µA) are designed for 5V TTL/CMOS compatibility. Interfacing with 3.3V systems requires level-shifting circuitry; the AT27C040-70TI itself cannot operate reliably below 4.5 V or above 5.5 V.
How is the Integrated Product Identification Code accessed on the AT27C040-70TI?
The AT27C040-70TI's ID code is read by asserting VPP = 11.5–12.5 V while holding A9 = VH and all other address lines A0–A8,A10–A18 = VIL. Toggling A0 selects Manufacturer ID (0x1E) when low or Device Code (0x0B) when high. This mode is defined in the "Product Identification" operating mode table and requires precise high-voltage control-standard 5V programmers cannot access it without VPP modulation capability.
Can the AT27C040-70TI be reprogrammed after initial programming?
No, the AT27C040-70TI is a one-time programmable (OTP) EPROM. Its floating-gate transistors undergo irreversible avalanche injection during programming; no erase mechanism (e.g., UV light or electrical erase) exists. Once programmed, data is permanent. For field-upgradable firmware, consider flash alternatives-but the AT27C040-70TI is intended for final, validated images only.
What decoupling capacitors are required for stable operation of the AT27C040-70TI?
Per Atmel's switching considerations, each AT27C040-70TI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close to the pins as possible. For boards with multiple AT27C040-70TI devices or large EPROM arrays, add a 4.7 µF bulk electrolytic capacitor near the power entry point. Failure to implement both increases risk of transient-induced read errors or programming corruption in the AT27C040-70TI.
AT27C040-70TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- 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:
- 32-TSOP
AT27C040-70TI FAQ
1.How can I place an order for AT27C040-70TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-70TI 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 AT27C040-70TI reliable?
The price and inventory of AT27C040-70TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-70TI is usually 5 days.
3.What payment methods are accepted for AT27C040-70TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-70TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-70TI?
AT27C040-70TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-70TI 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 AT27C040-70TI?
For technical support, including AT27C040-70TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-70TI requirements.
6.How does Aetrix verify that AT27C040-70TI is sourced from the original manufacturer or authorized distributors?
All AT27C040-70TI 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 AT27C040-70TI meets industry standards.
7.What is the process for return or replacement of AT27C040-70TI?
All AT27C040-70TI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-70TI, 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 AT27C040-70TI part is unused and in its original packaging.
Return procedure for AT27C040-70TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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