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STMicroelectronics M27C512-70XF1
- Part No.:
- M27C512-70XF1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C512-70XF1.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,452
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Product details
Overview
M27C512-70XF1 from STMicroelectronics is a 512 Kbit (64K × 8) UV-erasable EPROM in FDIP28W ceramic frit-seal window package, featuring 70 ns access time, 5 V ±10% read supply, and 12.75 V ±0.25 V programming voltage. It supports two-line output control (E and G), electronic signature (20h/3Dh), and PRESTO IIB programming with ~6 s typical write time. Used in legacy industrial controllers and boot memory for microcontrollers requiring non-volatile, field-erasable storage.
For engineers reviewing the M27C512-70XF1 datasheet, M27C512-70XF1 pinout, M27C512-70XF1 application, or M27C512-70XF1 equivalent, key selection considerations include UV erasure capability, 28-pin DIP-compatible footprint, TTL-level address/data interface, standby current of 100 µA, and compatibility with standard EPROM programmers supporting 12.75 V VPP and A9-based electronic signature verification.
Technical Context
The M27C512-70XF1 implements a CMOS-based UV EPROM architecture with dual active control lines: Chip Enable (E) for power gating and Output Enable (G) for bus contention management. Its logic diagram confirms full 16-bit address decoding (A0–A15) and 8-bit bidirectional data I/O (Q0–Q7) operating at TTL voltage levels.
Programming relies on the PRESTO IIB algorithm with 100 µs pulse width, margin mode verification at 6.25 V VCC, and precise timing coordination between VPP, E, A9 (11.5–12.5 V), and A10. Erasure requires 2537 Å UV light at ≥15 W·sec/cm² dose, achievable in 15–20 min at ≤2.5 cm distance from a 12,000 µW/cm² lamp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - provides 65,536 bytes of non-volatile storage for firmware or configuration data |
| Access Time | 70 ns - defines maximum delay from stable address/E low to valid Q0–Q7 output under 5 V read conditions |
| Read Supply | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no separate VPP required during read |
| Programming Voltage | 12.75 V ±0.25 V on GVPP - enables reliable Fowler-Nordheim tunneling into floating gate; requires dedicated programmer supply |
| Standby Current | 100 µA - achieved when E = VIH; critical for low-power hold states in battery-backed systems |
| Electronic Signature | Manufacturer code 20h, Device code 3Dh - allows automatic device identification by programmers via A9 high-voltage assertion and A0 toggle |
| UV Erase Dose | ≥15 W·sec/cm² at 2537 Å - ensures full bit reset to '1' state; windowed FDIP28W package enables field erasure |
Pinout & Package
FDIP28W is a 28-pin ceramic frit-seal dual in-line package with UV-transparent quartz window for erasure. Dimensions: 36.5–37.3 mm length, 15.2 mm width, 5.7 mm height; lead pitch 2.54 mm; window diameter ∅7.11 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit unidirectional address bus; A9 used as VID input (11.5–12.5 V) for electronic signature mode |
| Q0–Q7 | Data Outputs | 8-bit bidirectional data bus; outputs driven only when E = VIL and G = VIL; high-Z otherwise |
| E | Chip Enable | Active-low primary device select; places device in standby (100 µA) when high; initiates programming when pulsed low with VPP applied |
| G | Output Enable | Active-low secondary output gate; controls Q0–Q7 drive independently of E; enables multi-device bus sharing |
| VCC | Supply Voltage | +5 V ±10% for read; +6.25 V ±0.25 V required during programming |
| VSS | Ground | Reference return for all signals and supplies; must be decoupled with 0.1 µF ceramic capacitor per device |
| GVPP | Program Supply Input | Accepts 12.75 V ±0.25 V during programming; internally routed to floating gate injection circuitry |
| NC | No Connect | Pins 9 and 25 are internally unconnected; must remain floating or tied to VSS per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Two-line output control (E + G) | Enables zero-bus-contention memory arrays; E selects device power state, G gates output drivers - reduces system-level I/O contention risk |
| PRESTO IIB programming | Guarantees full array programming in ≤6.5 s with margin-mode verify; eliminates overprogramming and improves cell endurance |
| Electronic signature (20h/3Dh) | Allows automated device recognition by programmers via A9 high-voltage handshake - prevents incorrect algorithm application |
| ECOPACK® compliance | Lead-free FDIP28W construction meets JEDEC JESD97 second-level interconnect marking; supports RoHS-compliant manufacturing |
| UV erasability | Quartz window enables full bit-pattern erasure using 2537 Å UV light - supports iterative firmware development and field updates |
Applications
| Industrial PLC Boot Memory | Legacy Microcontroller Firmware Storage |
|---|---|
|
Use Scenario: Stores startup firmware for programmable logic controllers operating in factory automation environments with ambient fluorescent lighting. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing 64K×8 instruction space; accessed during cold start before RAM initialization. Use Value: UV window allows on-site firmware revision after machine downtime; 70 ns access ensures compatibility with 14 MHz Z80 or 80C88-based control buses. |
Use Scenario: Holds calibration constants and sensor lookup tables in analog front-end modules for test equipment. IC Role / Device Role / Timing Role: Read-only configuration memory mapped to fixed address range; accessed only during power-on self-test (POST). Use Value: 100 µA standby current minimizes quiescent drain in battery-buffered systems; electronic signature prevents misprogramming during field service. |
| Avionics Maintenance Interface | Medical Device Diagnostic Log Storage |
|
Use Scenario: Stores aircraft subsystem diagnostic routines accessible via ground maintenance port in legacy avionics units. IC Role / Device Role / Timing Role: Field-upgradable EPROM holding mission-critical diagnostics; erased and reprogrammed during depot-level servicing. Use Value: FDIP28W ceramic package withstands thermal cycling (-40°C to +125°C); UV erasure avoids solder rework during firmware updates. |
Use Scenario: Retains error logs and calibration history in Class II medical infusion pumps requiring traceable firmware revisions. IC Role / Device Role / Timing Role: Immutable audit trail memory; contents verified at power-up using checksum against Q0–Q7 read cycle. Use Value: PRESTO IIB programming guarantees bit integrity across 100+ write cycles; ECOPACK® compliance satisfies IEC 60601-1 material restrictions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UV EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-70DC | 70 ns access, PDIP28 package, no UV window - OTP-only; identical 5 V read / 12.75 V program specs | Used where firmware is finalized and field erasure is unnecessary; lower cost due to plastic packaging | Select when UV erasure is not required and board space allows standard DIP footprint without window clearance |
| AT27C512R-70PU | 70 ns access, PDIP28, 5 V-only operation (no VPP pin); uses internal charge pump for programming | Suitable for systems lacking dedicated 12.75 V supply; requires different programming algorithm and timing | Choose when simplifying power design outweighs need for field erasure; verify compatibility with existing programmer firmware |
Compared with M27C512-70XF1, AM27C512-70DC sacrifices UV erasability for cost and robustness in sealed environments, while AT27C512R-70PU eliminates external VPP but removes field-erasable capability and alters programming infrastructure requirements.
Availability
M27C512-70XF1 is available at Aetrix Electronics and suitable for industrial PLC boot memory, legacy microcontroller firmware storage, avionics maintenance interfaces, and medical device diagnostic log storage requiring stable component supply across extended product lifecycles.
Supply support for M27C512-70XF1 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 discrete solutions with strong heritage in non-volatile memory.
The M27C512 belongs to ST's legacy EPROM product line, designed specifically for applications demanding field-erasable, pin-compatible replacement of earlier 27xx-series ROMs in industrial control, instrumentation, and aerospace systems.
FAQ
What UV wavelength and exposure time are required to fully erase the M27C512-70XF1?
Full erasure requires exposure to 2537 Å short-wave ultraviolet light at a minimum integrated dose of 15 W·sec/cm². Using a standard 12,000 µW/cm² UV lamp placed ≤2.5 cm from the device, erasure takes 15–20 minutes. Fluorescent room lighting may cause partial erasure over years; direct sunlight can erase in ~1 week.
Can the M27C512-70XF1 be programmed with a modern EPROM programmer?
Yes - it supports standard PRESTO IIB and legacy programming algorithms. The programmer must supply 12.75 V ±0.25 V to GVPP, apply 6.25 V ±0.25 V to VCC during programming, and assert 11.5–12.5 V on A9 for electronic signature verification. Pinout matches industry-standard 28-pin DIP, enabling use with adapters for ZIF sockets.
Is the FDIP28W package RoHS-compliant?
Yes - the M27C512-70XF1 is offered in ST's ECOPACK® variant, which is lead-free and complies with RoHS Directive 2011/65/EU. JEDEC JESD97 second-level interconnect markings appear on both package and inner box label, confirming environmental compliance.
How does the two-line output control (E and G) reduce system power consumption?
When E = VIH, the device enters standby mode drawing only 100 µA, regardless of G state. When multiple devices share a data bus, E is decoded per-device while G is common - ensuring only one device drives outputs while others remain in ultra-low-power standby, minimizing total bus leakage and switching current.
M27C512-70XF1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm) Window
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - UV
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-CDIP Frit Seal with Window
M27C512-70XF1 FAQ
1.How can I place an order for M27C512-70XF1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C512-70XF1 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 M27C512-70XF1 reliable?
The price and inventory of M27C512-70XF1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C512-70XF1 is usually 5 days.
3.What payment methods are accepted for M27C512-70XF1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C512-70XF1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C512-70XF1?
M27C512-70XF1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C512-70XF1 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 M27C512-70XF1?
For technical support, including M27C512-70XF1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C512-70XF1 requirements.
6.How does Aetrix verify that M27C512-70XF1 is sourced from the original manufacturer or authorized distributors?
All M27C512-70XF1 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 M27C512-70XF1 meets industry standards.
7.What is the process for return or replacement of M27C512-70XF1?
All M27C512-70XF1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C512-70XF1, 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 M27C512-70XF1 part is unused and in its original packaging.
Return procedure for M27C512-70XF1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C512-70XF1 Tags
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