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STMicroelectronics M27C64A-15F1
- Part No.:
- M27C64A-15F1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C64A-15F1.pdf
- Description:
- IC EPROM 64KBIT PARALLEL 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,786
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Product details
Overview
M27C64A-15F1 from STMicroelectronics is a 64 Kbit (8K × 8) UV-erasable EPROM in FDIP28W ceramic window package, featuring 100 ns access time, 5V ±10% read supply, active current of 30 mA, standby current of 100 µA, and 12.5V programming voltage - used for firmware storage in legacy microprocessor systems requiring field-erasable nonvolatile code retention.
For engineers reviewing the M27C64A-15F1 datasheet, M27C64A-15F1 pinout, M27C64A-15F1 application, or M27C64A-15F1 equivalent, this page delivers verified electrical specs, dual-line control timing behavior, UV erasure requirements, electronic signature codes (9Bh/08h), and ECOPACK® lead-free compliance - all critical for legacy system repair, reprogramming, and obsolescence mitigation.
Technical Context
The M27C64A-15F1 implements TTL-compatible address/data interface with two independent enable controls: Chip Enable (E) for device selection and power gating, and Output Enable (G) for output bus contention management. Its dual-line architecture enables low-power memory arrays by placing deselected devices in CMOS standby (100 µA) while keeping outputs high-impedance regardless of G state.
Programming requires VPP = 12.5V ±0.25V, VCC = 6V ±0.25V, and pulsed P input; verification uses same VPP/VCC but with P = VIH. Electronic Signature mode reads manufacturer code 9Bh and device code 08h via A9 = 12V and A0 toggling - essential for automated programmers to validate device identity before programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits) - supports full 16-bit address space for 8-bit microprocessors like Z80 or 8085. |
| Access Time | 100 ns - meets timing budgets for 10 MHz CPU buses without wait states. |
| Read Supply | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required during operation. |
| Standby Current | 100 µA - enables low-power hold mode in battery-backed or portable embedded systems. |
| Programming Voltage | 12.5V ±0.25V - requires dedicated HV supply; not derived from VCC; ensures reliable Fowler-Nordheim tunneling. |
| Electronic Signature | Manufacturer Code 9Bh, Device Code 08h - enables automatic algorithm selection in universal EPROM programmers. |
| UV Erase Dose | ≥15 W·sec/cm² at 2537 Å - defines minimum exposure for full bit reset; ~15–20 min under 12,000 µW/cm² lamp. |
Pinout & Package
FDIP28W: 28-pin ceramic dual-in-line package with UV-transparent quartz window for erasure; frit-sealed construction ensures hermetic reliability in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus (0–8191); TTL-compatible; decoded internally to select one of 8K bytes. |
| Q0–Q7 | Data Outputs | Bi-directional data bus during programming (input) and read (output); TTL-level drive capability. |
| E | Chip Enable | Primary device select; VIH ≥ 2V places device in standby (100 µA); VIL ≤ 0.8V enables read/program modes. |
| G | Output Enable | Secondary output gate; controls Q0–Q7 drive state independently of E; prevents bus contention in multi-chip arrays. |
| P | Program Control | Active-low pulse input; initiates programming cycle when E = VIL and VPP = 12.5V; pulse width 0.95–1.05 ms. |
| VPP | Programming Supply | 12.5V ±0.25V input; must be applied simultaneously with or after VCC; enables oxide breakdown for bit programming. |
| VCC | Supply Voltage | 5V ±10% for read; 6V ±0.25V for programming - separate VCC requirement prevents read-mode interference during write. |
| VSS | Ground | Reference return for all signals; decoupling requires 0.1 µF ceramic capacitor placed adjacent to pin. |
| A9 (ES) | Electronic Signature Input | Receives 11.5–12.5V during signature read; used only for ID verification - not functional in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Two-line output control (E + G) | Enables zero-bus-contention memory expansion: E selects device (and gates power), G gates outputs - critical for shared data bus systems. |
| UV erasability with window package | FDIP28W allows full pattern reset using 2537 Å UV light; supports firmware iteration in lab/field without device replacement. |
| ECOPACK® lead-free compliance | Meets JEDEC JESD97 marking standards; RoHS-compliant finish on leads and package surface - suitable for modern rework/reflow. |
| Electronic Signature (9Bh/08h) | Enables unattended programming validation: automated tools verify STMicroelectronics origin and M27C64A identity before applying algorithm. |
| High-speed programming (<1 min) | Uses multi-pulse verify-and-reprogram sequence; reduces production programming time vs. traditional single-pass methods. |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot Code |
|---|---|
Use Scenario: Storing fixed boot firmware in programmable logic controllers deployed in factory automation cabinets with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to CPU address space; provides deterministic 100 ns instruction fetch latency. Use Value: UV erasability allows field updates when logic changes; FDIP28W package withstands thermal cycling and vibration in industrial enclosures. |
Use Scenario: Holding calibration-critical startup routines in early 1990s engine control units where EEPROM was cost-prohibitive. IC Role / Device Role / Timing Role: Read-only execution memory for MCS-51 derivatives; accessed during cold-start before RAM initialization. Use Value: 100 µA standby draw minimizes battery drain during vehicle off-state; ECOPACK® finish ensures compatibility with modern soldering processes during repair. |
| Military Communications Radio BIOS | Medical Imaging System Boot ROM |
Use Scenario: Securing immutable boot loader in HF/VHF tactical radios operating across –40°C to +85°C military temperature range. IC Role / Device Role / Timing Role: First-stage boot memory; initialized immediately after power-on reset; timing-critical for secure key loading sequence. Use Value: Hermetic FDIP28W package resists humidity and salt fog; UV window enables secure reflash in controlled maintenance facilities. |
Use Scenario: Hosting diagnostic self-test routines in CT scanner mainboards where firmware integrity is FDA-regulated. IC Role / Device Role / Timing Role: Static code repository for safety-critical power-up diagnostics; accessed before DRAM initialization. Use Value: Electronic signature (9Bh/08h) provides traceable device provenance; ECOPACK® marking satisfies medical device material disclosure requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C64APC | Same 64K×8 organization and 100 ns speed, but AMD-branded; requires identical 12.5V VPP and 6V VCC for programming; signature codes differ (AMD = 37h). | Used in AMD-based designs; pinout identical but lacks ST-specific ECOPACK® marking and UV dose validation data. | Select when sourcing from AMD-dedicated supply chains or when cross-programmer compatibility with AMD toolsets is required. |
| AT27C64A-10PU | Atmel variant with 100 ns access; supports same VPP/VCC; differs in standby current (200 µA vs. 100 µA) and electronic signature (1Eh/08h). | Common in Atmel MCU development boards; PLCC32 option available but no FDIP28W UV window variant. | Prefer for new designs needing PLCC packaging or when Atmel programmer ecosystem is standardized. |
Compared with AM27C64APC and AT27C64A-10PU, the M27C64A-15F1 offers lowest standby current (100 µA), ST-specific UV erasure validation, and ECOPACK® compliance - making it optimal for long-life industrial repairs where power budget and regulatory traceability are decisive.
Availability
M27C64A-15F1 is available at Aetrix Electronics and suitable for industrial PLC firmware updates, legacy automotive ECU reprogramming, and military radio BIOS restoration requiring stable component supply amid obsolescence challenges.
Supply support for M27C64A-15F1 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, delivering silicon solutions for automotive, industrial, and embedded markets since 1987.
The M27C64A belongs to ST's legacy EPROM product line, designed specifically for field-upgradable firmware storage in microprocessor-based systems where nonvolatility, UV erasability, and TTL compatibility were essential design constraints.
FAQ
What UV wavelength and exposure time are required to fully erase the M27C64A-15F1?
Full erasure requires short-wave ultraviolet light at 2537 Å with a minimum integrated dose of 15 W·sec/cm². Using a standard 12,000 µW/cm² UV lamp, the device must be placed within 2.5 cm of the source for 15–20 minutes. Room fluorescent lighting may cause partial erasure over years; direct sunlight can erase it in ~1 week - hence the opaque label recommendation for long-term storage.
Can the M27C64A-15F1 be programmed using a 5V-only system?
No. Programming requires three distinct voltage domains: VCC = 6V ±0.25V, VPP = 12.5V ±0.25V, and A9 = 11.5–12.5V for electronic signature. A 5V-only system cannot meet these specifications; dedicated HV programming hardware with isolated supplies is mandatory for reliable bit programming and verification.
Is the FDIP28W package of the M27C64A-15F1 compatible with standard DIP-28 sockets?
Yes - the FDIP28W is mechanically identical to industry-standard 28-pin DIP footprints (0.6-inch width, 0.1-inch pin pitch), enabling drop-in replacement in existing sockets. However, its ceramic body and UV window require careful handling: avoid touching the quartz surface, and store covered to prevent accidental erasure from ambient UV sources.
How does the two-line control (E and G) reduce power consumption in multi-chip memory systems?
By decoding E per device (placing unselected chips in 100 µA standby), while tying G globally to the system READ line, only the selected chip drives the bus - eliminating contention and eliminating active current draw (30 mA) from all other devices. This architecture cuts total array power by >95% compared to single-enable designs during sequential access.
M27C64A-15F1 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:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-CDIP Frit Seal with Window
M27C64A-15F1 FAQ
1.How can I place an order for M27C64A-15F1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C64A-15F1 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 M27C64A-15F1 reliable?
The price and inventory of M27C64A-15F1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C64A-15F1 is usually 5 days.
3.What payment methods are accepted for M27C64A-15F1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C64A-15F1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C64A-15F1?
M27C64A-15F1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C64A-15F1 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 M27C64A-15F1?
For technical support, including M27C64A-15F1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C64A-15F1 requirements.
6.How does Aetrix verify that M27C64A-15F1 is sourced from the original manufacturer or authorized distributors?
All M27C64A-15F1 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 M27C64A-15F1 meets industry standards.
7.What is the process for return or replacement of M27C64A-15F1?
All M27C64A-15F1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C64A-15F1, 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 M27C64A-15F1 part is unused and in its original packaging.
Return procedure for M27C64A-15F1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C64A-15F1 Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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