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STMicroelectronics M27C512-90F1
- Part No.:
- M27C512-90F1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C512-90F1.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,919
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Product details
Overview
M27C512-90F1 from STMicroelectronics is a 512 Kbit (64K × 8) UV-erasable EPROM in FDIP28W ceramic frit-seal window package, featuring 90 ns access time, 5 V ±10% read supply, 30 mA active current, and 12.75 V ±0.25 V programming voltage. It supports PRESTO IIB algorithm for ~6 s programming and electronic signature (20h/3Dh) for automated programmer recognition, used in legacy industrial control firmware storage and boot memory where UV reprogrammability is required.
For engineers reviewing the M27C512-90F1 datasheet, M27C512-90F1 pinout, M27C512-90F1 application, or M27C512-90F1 equivalent, key selection criteria include UV erasure capability, 28-pin ceramic DIP mechanical compatibility, 90 ns read timing under TTL-level control, and GVPP-based dual-voltage programming interface - all critical for retrofitting legacy EPROM-based systems.
Technical Context
The M27C512-90F1 implements a two-line output control architecture with independent Chip Enable (E) and Output Enable (G) inputs, enabling low-power array expansion and eliminating bus contention. Its read mode requires E = VIL and G = VIL to drive Q0–Q7 outputs, with tELQV = 90 ns and tGLQV = 40 ns under standard AC conditions.
Programming operates at VCC = 6.25 V ±0.25 V and VPP = 12.75 V ±0.25 V, using E-pulsed 95–105 µs program pulses and margin-mode verification. The FDIP28W package includes a UV-transparent quartz window for erasure via 2537 Å light (≥15 W·sec/cm² dose), distinguishing it from OTP variants in PDIP/PLCC packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - provides full 64 KB addressable byte-wide storage for 8-bit microcontroller boot code. |
| Access Time | 90 ns - defines maximum clock-to-data delay in read mode, compatible with 11 MHz system buses. |
| Read Supply | 5 V ±10% - operates directly from standard TTL/CMOS logic rails without regulation. |
| Active Current | 30 mA - determines power budget per device in active memory arrays. |
| Standby Current | 100 µA - enables low-quiescent operation during CPU wait states or idle cycles. |
| Programming Voltage | 12.75 V ±0.25 V on GVPP - requires dedicated high-voltage supply rail, not derived from VCC. |
| Electronic Signature | Manufacturer code 20h, Device code 3Dh - enables automatic device identification in universal programmers. |
Pinout & Package
FDIP28W (28-pin Ceramic Frit-seal DIP with UV window) - hermetically sealed ceramic body with quartz lid for ultraviolet erasure; 0.6-inch width, 1.47-inch length, 0.18-inch height; lead finish Pb-free per ECOPACK® specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; A9 carries 11.5–12.5 V for Electronic Signature mode. |
| Q0–Q7 | Data Outputs | Bi-directional data bus pins used for both read output and parallel programming input. |
| E | Chip Enable | Active-low primary device select; pulsed low during programming; high disables outputs and enters standby (100 µA). |
| G | Output Enable | Active-low secondary output gate; controls Q0–Q7 Hi-Z state independently of E for bus sharing. |
| VCC | Supply Voltage | +5 V read supply; must be applied simultaneously with or before VPP and removed after VPP. |
| VSS | Ground | Reference return for all signals and supplies; requires local 0.1 µF ceramic decoupling. |
| GVPP | Program Supply Input | Accepts 12.75 V ±0.25 V during programming; also serves as output enable when low in read mode. |
| NC | No Connect | Pins 9 and 25 are internally unconnected; must remain floating or tied to ground per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| UV Erasability | Full bit-pattern erasure via 2537 Å UV light (15–20 min exposure); enables field reprogramming without device replacement. |
| PRESTO IIB Algorithm | Guaranteed programming in ≤6.5 s with margin-mode verify pulses; eliminates over-programming and improves cell endurance. |
| Two-Line Output Control | Independent E and G inputs allow hierarchical memory decoding: E selects device, G gates output to shared bus - reducing system power and contention risk. |
| Electronic Signature | Factory-programmed 20h/3Dh ID codes readable via A9 voltage forcing; ensures correct algorithm selection in automated programmers. |
| ECOPACK® Compliance | Lead-free ceramic package meeting JEDEC JESD97 second-level interconnect marking; supports RoHS-compliant legacy system refurbishment. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing ladder logic firmware in programmable logic controllers requiring field updates via UV erasure and reprogramming. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; 90 ns access satisfies 8051/68HC11 bus timing constraints. Use Value: UV window enables on-site firmware revision without PCB rework; ECOPACK® compliance supports environmental certification renewal. |
Use Scenario: Holding initialization code and interrupt vectors for 8-bit microcontrollers in aerospace avionics subsystems with long service life. IC Role / Device Role / Timing Role: Primary boot ROM accessed at power-on reset; GVPP-controlled programming allows factory-level configuration post-assembly. Use Value: 100 µA standby current minimizes battery drain in always-on monitoring modules; ceramic package ensures thermal stability across –40°C to +125°C. |
| Test Equipment Configuration Memory | Military Communications System BIOS |
|
Use Scenario: Storing calibration constants and test sequence definitions in automated benchtop test instruments subject to periodic revision. IC Role / Device Role / Timing Role: Read-only configuration store accessed via parallel bus during instrument startup; E/G dual-control prevents bus conflicts during multi-device reads. Use Value: Electronic signature (20h/3Dh) enables self-identifying firmware loaders; 30 mA active current aligns with instrument power budget limits. |
Use Scenario: Securing boot integrity in secure radio transceivers where firmware authenticity is verified prior to execution. IC Role / Device Role / Timing Role: Immutable BIOS image storage; UV erasure permits controlled re-keying during maintenance cycles under supervision. Use Value: FDIP28W ceramic construction resists radiation-induced bit flips; 12.75 V programming voltage provides noise margin against EMI in RF-dense environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UV EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-90DC | 90 ns access, 28-pin PDIP, no UV window - OTP only; same 5 V read, 12.75 V program voltage. | Cannot be erased or reprogrammed after initial burn-in; suitable only for fixed firmware deployments. | Select when field reprogrammability is unnecessary and cost-sensitive plastic packaging is preferred. |
| MBM27C512-90P | 90 ns access, 28-pin PDIP, OTP; manufactured by Fujitsu; identical pinout but different electronic signature (10h/3Dh). | Lacks UV erasure capability and margin-mode programming; requires separate programmer algorithm support. | Choose for drop-in replacement where UV window is not required and STMicroelectronics sourcing is constrained. |
Compared with AM27C512-90DC and MBM27C512-90P, the M27C512-90F1 uniquely supports field-erasable firmware updates via its FDIP28W quartz window, while maintaining identical timing and voltage specifications - making it the sole option for legacy systems requiring iterative development or maintenance-level reprogramming.
Availability
M27C512-90F1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, test equipment configuration memory, and military communications BIOS requiring stable component supply across extended product lifecycles.
Supply support for M27C512-90F1 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, designing and manufacturing analog, MCU, power, and memory products for industrial, automotive, and consumer markets.
The M27C512 belongs to ST's legacy EPROM product line, engineered specifically for UV-erasable, pin-compatible replacement of obsolete 27-series EPROMs in long-lifecycle industrial and defense systems.
FAQ
What UV wavelength and exposure time are required to fully erase the M27C512-90F1?
The M27C512-90F1 requires short-wave ultraviolet light at 2537 Å wavelength with a minimum integrated dose of 15 W·sec/cm². Using a 12,000 µW/cm² lamp, erasure takes 15–20 minutes at 2.5 cm distance. Direct sunlight (3000–4000 Å) may cause partial erasure in ~1 week; room fluorescent lighting can erase over ~3 years.
Can the M27C512-90F1 be programmed with standard 5 V logic levels?
No. Programming requires VCC = 6.25 V ±0.25 V and GVPP = 12.75 V ±0.25 V applied simultaneously; address/data lines use TTL levels (0.8 V/2.0 V thresholds), but A9 must be driven to 11.5–12.5 V for Electronic Signature mode. Standard 5 V-only programmers cannot perform full programming or signature read.
Is the FDIP28W package RoHS-compliant?
Yes. The M27C512-90F1 is offered in ECOPACK®-compliant FDIP28W packaging, which is lead-free and marked per JEDEC JESD97 for second-level interconnect classification. The inner box label specifies soldering profile limits and environmental compliance data.
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 E = VIL and G = VIH, outputs go Hi-Z while internal circuitry remains active (~30 mA). This allows deselected devices in memory arrays to minimize power draw and prevent bus contention - unlike single-enable architectures.
M27C512-90F1 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:
- 90 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
M27C512-90F1 FAQ
1.How can I place an order for M27C512-90F1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C512-90F1 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 M27C512-90F1 reliable?
The price and inventory of M27C512-90F1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C512-90F1 is usually 5 days.
3.What payment methods are accepted for M27C512-90F1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C512-90F1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C512-90F1?
M27C512-90F1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C512-90F1 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 M27C512-90F1?
For technical support, including M27C512-90F1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C512-90F1 requirements.
6.How does Aetrix verify that M27C512-90F1 is sourced from the original manufacturer or authorized distributors?
All M27C512-90F1 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 M27C512-90F1 meets industry standards.
7.What is the process for return or replacement of M27C512-90F1?
All M27C512-90F1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C512-90F1, 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 M27C512-90F1 part is unused and in its original packaging.
Return procedure for M27C512-90F1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C512-90F1 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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