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STMicroelectronics M27C1001-45XB1
- Part No.:
- M27C1001-45XB1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
M27C1001-45XB1.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,452
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Product details
Overview
M27C1001-45XB1 from STMicroelectronics is a 1 Mbit (128K × 8) UV-erasable EPROM with 45 ns access time, 5V ±10% supply voltage, and FDIP32W ceramic window package. It features dual-line control (E/G), electronic signature (20h/05h), and supports programming at 12.75V for embedded microprocessor program storage in industrial control systems.
For engineers reviewing the M27C1001-45XB1 datasheet, M27C1001-45XB1 pinout, M27C1001-45XB1 application, or M27C1001-45XB1 equivalent, key selection criteria include UV-erase capability, 45 ns read timing under TTL/CMOS interface conditions, FDIP32W package compatibility with UV erasure fixtures, and verified electronic signature for automated programmer recognition.
Technical Context
The M27C1001-45XB1 implements a two-line output control architecture with independent Chip Enable (E) and Output Enable (G) inputs to minimize bus contention and reduce active power dissipation. Its internal array is organized as 131,072 words × 8 bits, with address lines A0–A16 and bidirectional data I/O on Q0–Q7 during programming.
Programming requires VPP = 12.75V ±0.25V, VCC = 6.25V ±0.25V, and a 100 µs pulse on P while E is low; verification occurs with VPP = 12.75V and VCC = 6.25V, using margin-mode sensing to ensure cell-level programming reliability without overprogramming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 × 8) - supports full 16-bit microprocessor instruction fetch without banking. |
| Access Time | 45 ns - guarantees valid data at Q0–Q7 within 45 ns after E and G both go low, meeting 22 MHz bus timing. |
| Supply Voltage | 5V ±10% in read mode - compatible with legacy TTL/CMOS logic rails without regulation overhead. |
| Active Current | 30 mA at 5 MHz - enables low-power operation in battery-backed or thermally constrained systems. |
| Standby Current | 100 µA - reduces system quiescent draw when memory is deselected via E high. |
| Programming Voltage | 12.75V ±0.25V on VPP - requires dedicated HV supply but ensures reliable Fowler-Nordheim tunneling. |
| Electronic Signature | Manufacturer Code 20h, Device Code 05h - enables automatic algorithm selection in universal programmers. |
Pinout & Package
FDIP32W (32-pin ceramic frit-seal DIP with UV-transparent window) provides hermetic sealing and direct UV exposure capability for field erasure. The package includes 16.18 mm body width (eB), 41.9 mm length (D), and 5.72 mm height (A), optimized for socketed prototyping and long-life industrial firmware storage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word decoding; A9 used for Electronic Signature voltage (11.5–12.5V) during ID read. |
| Q0–Q7 | Data Outputs / Programming Inputs | Bidirectional: outputs during read/verify, inputs during programming; TTL-compatible drive strength (IOL = 2.1 mA). |
| E | Chip Enable | Primary device select; CMOS/TTL-compatible; asserts standby mode (100 µA ICC2) when high. |
| G | Output Enable | Secondary output gate; allows shared G-bus across multiple EPROMs while keeping deselected devices in Hi-Z. |
| P | Program Control | Active-low pulse input (100 µs width); initiates programming only when E = low and VPP = 12.75V. |
| VPP | Programming Supply | 12.75V ±0.25V input; must be applied simultaneously with or after VCC and removed simultaneously or before VCC. |
| VCC | Supply Voltage | 5V ±10% for read; 6.25V ±0.25V for programming - separate voltage domains prevent read-mode corruption during write cycles. |
| VSS | Ground | Common reference for all signals; decoupling requires 0.1 µF ceramic capacitor placed adjacent to pin. |
| NC | No Connect | Internally unconnected; no external loading or routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line output control (E + G) | Eliminates bus contention in multi-chip memory arrays by enabling independent device selection and output gating. |
| UV-erasable FDIP32W package | Enables >1000 erase/write cycles via 15–20 min exposure to 2537 Å UV light at ≥15 W·sec/cm² dose. |
| Electronic Signature (20h/05h) | Allows zero-configuration recognition in automated programming equipment without manual part number entry. |
| Presto II programming algorithm | Guarantees full-array programming in ~13 seconds with built-in margin verification-no overprogram pulses needed. |
| Wide temperature range | –40°C to +125°C operation supports deployment in automotive engine control units and industrial PLCs. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile boot-time code storage with UV-field reprogrammability for firmware updates between production runs. Use Value: FDIP32W window enables on-site erasure without component removal; 45 ns access satisfies 22 MHz bus timing of 80C186-based controllers. |
Use Scenario: Holding immutable startup routines and peripheral initialization code for 8-bit/16-bit microcontrollers in medical diagnostic instruments. IC Role / Device Role / Timing Role: Primary read-only memory mapped at reset vector; accessed via standard address/data bus with E/G handshaking. Use Value: 100 µA standby current extends battery life in portable devices; electronic signature prevents misprogramming during field service. |
| Avionics Test Equipment Calibration Data | Telecom Line Card Configuration Memory |
|
Use Scenario: Retaining calibrated ADC/DAC offset/gain coefficients in airborne test sets where radiation tolerance and long-term data retention are critical. IC Role / Device Role / Timing Role: Static configuration store accessed only at power-up; immune to SEU due to non-volatile floating-gate architecture. Use Value: –40°C to +125°C rating meets DO-160 environmental requirements; UV erasure allows recalibration without soldering. |
Use Scenario: Storing protocol-specific initialization parameters and hardware revision flags in carrier-grade DSLAM line cards. IC Role / Device Role / Timing Role: System-critical configuration ROM mapped into processor address space; read during cold start and warm reset. Use Value: Dual E/G control prevents bus conflicts during hot-swap events; 30 mA active current aligns with line card power budget constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C1001-45DC | 45 ns access, PDIP32 package, no UV window; same 1 Mbit × 8 organization and 12.75V programming. | Not field-erasable; requires socket replacement for firmware updates instead of UV exposure. | Select when cost-sensitive volume production eliminates need for field reprogramming. |
| AT27C1001-45JC | 45 ns access, PLCC32 package; identical pinout except NC placement; 100 µA standby current. | Lacks UV window; uses plastic encapsulation unsuitable for repeated erasure cycles. | Choose for surface-mount assembly where board space and reflow compatibility outweigh erasure flexibility. |
Compared with M27C1001-45XB1, AM27C1001-45DC sacrifices field erasability for lower cost in fixed-function systems, while AT27C1001-45JC trades UV capability for SMT manufacturability-neither supports the FDIP32W's certified 1000-cycle erasure endurance.
Availability
M27C1001-45XB1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, avionics calibration data retention, and telecom line card configuration requiring stable component supply across extended product lifecycles.
Supply support for M27C1001-45XB1 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and quality-certified wafer fabs.
The M27C1001 belongs to ST's legacy EPROM product line, designed specifically for high-reliability, field-upgradable firmware storage in systems where flash memory was not yet mature or qualified.
FAQ
What UV wavelength and exposure time are required to fully erase the M27C1001-45XB1?
Full erasure requires exposure to short-wave ultraviolet light at 2537 Å wavelength for 15–20 minutes at an intensity of ≥12,000 µW/cm², with the device placed within 2.5 cm of the lamp source. Integrated UV dose must reach ≥15 W·sec/cm²; room fluorescent lighting may cause partial erasure over years.
Can the M27C1001-45XB1 be programmed in-system using standard 5V logic levels?
No. Programming requires VPP = 12.75V ±0.25V applied to the VPP pin, VCC = 6.25V ±0.25V, and a 100 µs low pulse on the P pin while E is low. Standard 5V logic cannot generate the required high-voltage programming signal; dedicated EPROM programmers or HV interface circuitry are mandatory.
How does the Electronic Signature mode function, and what pins are involved?
Electronic Signature mode activates when 11.5–12.5V is applied to A9, with VPP = VCC = 5V and all other address lines held low. Toggling A0 reads Manufacturer Code (20h) when A0 = low, then Device Code (05h) when A0 = high - used by programmers to auto-detect part identity without user input.
Is the FDIP32W package RoHS-compliant, and what is its moisture sensitivity level?
The FDIP32W package is exempt from RoHS lead restrictions under Annex III due to its ceramic hermetic construction and UV-transmissive window material; it has no moisture sensitivity level (MSL) rating as it is not moisture-sensitive and does not require baking prior to soldering.
M27C1001-45XB1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 45 ns
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
M27C1001-45XB1 FAQ
1.How can I place an order for M27C1001-45XB1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C1001-45XB1 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 M27C1001-45XB1 reliable?
The price and inventory of M27C1001-45XB1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C1001-45XB1 is usually 5 days.
3.What payment methods are accepted for M27C1001-45XB1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C1001-45XB1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C1001-45XB1?
M27C1001-45XB1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C1001-45XB1 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 M27C1001-45XB1?
For technical support, including M27C1001-45XB1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C1001-45XB1 requirements.
6.How does Aetrix verify that M27C1001-45XB1 is sourced from the original manufacturer or authorized distributors?
All M27C1001-45XB1 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 M27C1001-45XB1 meets industry standards.
7.What is the process for return or replacement of M27C1001-45XB1?
All M27C1001-45XB1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C1001-45XB1, 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 M27C1001-45XB1 part is unused and in its original packaging.
Return procedure for M27C1001-45XB1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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