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STMicroelectronics M27C512-90C1
- Part No.:
- M27C512-90C1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
M27C512-90C1.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,853
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Product details
Overview
M27C512-90C1 from STMicroelectronics is a 512 Kbit (64K × 8) OTP EPROM in PLCC32 package, featuring 90 ns access time, 5 V ±10% read supply, 30 mA active current, 100 µA standby current, and 12.75 V ±0.25 V programming voltage. It serves as non-volatile program storage in legacy microcontroller boot loaders, industrial firmware modules, and embedded system configuration memory.
For engineers reviewing the M27C512-90C1 datasheet, M27C512-90C1 pinout, M27C512-90C1 application, or M27C512-90C1 equivalent, this page delivers verified electrical specs, PLCC32 terminal mapping, OTP programming timing constraints, electronic signature codes (20h/3Dh), and real-world use context for legacy system maintenance and replacement sourcing.
Technical Context
The M27C512-90C1 operates in three primary modes: Read (E=VIL, G=VIL), Standby (E=VIH), and Programming (E pulsed low with GVPP=12.75 V). Its two-line output control (E and G) enables low-power memory array expansion without bus contention.
It implements PRESTO IIB programming algorithm with guaranteed margin verification at 6.5 s typical, requiring VCC=6.25 V ±0.25 V during programming and supporting Electronic Signature mode via 12 V on A9 to return manufacturer code 20h and device code 3Dh on Q7–Q0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - supports full 16-bit address space with byte-wide data interface |
| Access Time | 90 ns - defines maximum clock-to-data delay in read mode under standard AC conditions |
| Read Supply | 5 V ±10% - compatible with legacy TTL/CMOS logic rails without external regulation |
| Active Current | 30 mA - determines power budget for memory subsystems in sustained read operation |
| Standby Current | 100 µA - enables low-quiescent power retention during system sleep or idle states |
| Programming Voltage | 12.75 V ±0.25 V - requires dedicated high-voltage supply rail; not derived from VCC |
| Programming Time | ~6.5 s (PRESTO IIB) - enables rapid field reprogramming without UV erasure infrastructure |
Pinout & Package
PLCC32 (Plastic Leaded Chip Carrier, 32-pin) with J-lead profile, lead-free ECOPACK® construction, and JEDEC-standard footprint (1.27 mm pitch, 11.43 mm × 11.43 mm body).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; selects one of 65,536 bytes; TTL-compatible input thresholds |
| Q0–Q7 | Data Outputs | Bi-directional data bus in programming mode; outputs valid within 90 ns after E low |
| E | Chip Enable | Primary device select; CMOS high (≥VCC–0.2 V) places device in 100 µA standby |
| G | Output Enable | Secondary output gate; independent of E; controls Hi-Z state of Q0–Q7 |
| GVPP | Program Supply / Output Enable | Shared pin: 12.75 V during programming; VIL/VIL during read; must be decoupled |
| VCC | Supply Voltage | 5 V ±10% for read; 6.25 V ±0.25 V required during programming |
| VSS | Ground | Reference for all inputs/outputs; requires local 0.1 µF ceramic decoupling |
| NC | No Connect | Pins 9 and 25 are internally unconnected; must remain floating or grounded per layout |
Key Features
| Feature | Design Value |
|---|---|
| OTP Configuration | One-time programmable architecture eliminates UV erasure infrastructure and window handling |
| Two-Line Output Control | Independent E and G pins enable zero-bus-contention memory expansion in multi-chip systems |
| Electronic Signature | Manufacturer code 20h and device code 3Dh readable via A9=12 V, enabling auto-algorithm selection in programmers |
| PRESTO IIB Algorithm | Margin-mode verify ensures reliable programming in ≤6.5 s without over-programming risk |
| ECOPACK® Compliance | Lead-free PLCC32 package meets JEDEC JESD97 marking and RoHS requirements |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic firmware in DIN-rail mounted programmable logic controllers where field updates are infrequent but critical. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; accessed during power-on reset sequence with deterministic 90 ns latency. Use Value: Eliminates need for UV erasers or rework stations; supports drop-in replacement of older EPROMs in certified industrial hardware. |
Use Scenario: Providing immutable startup code for 8051- or Z80-based instrumentation controllers deployed in factory-floor environments. IC Role / Device Role / Timing Role: Primary instruction ROM; synchronized to system clock via E/G handshaking to avoid metastability during instruction fetch. Use Value: 100 µA standby current extends battery-backed operation during brown-out events; ECOPACK® compliance satisfies modern environmental audits. |
| Avionics Configuration Memory | Medical Device Calibration Table Storage |
|
Use Scenario: Holding flight-control parameter tables in certified avionics modules where reprogramming occurs only during depot-level maintenance. IC Role / Device Role / Timing Role: Static configuration store; accessed via memory-mapped I/O with strict tAVQV ≤90 ns timing to meet DO-254 timing budgets. Use Value: PRESTO IIB programming guarantees bit-level margin for long-term data retention across thermal cycling (–40°C to +125°C). |
Use Scenario: Storing calibrated sensor offset/gain coefficients in Class II medical diagnostic equipment requiring traceable firmware integrity. IC Role / Device Role / Timing Role: Read-only calibration database; accessed during self-test initialization with verified electronic signature (20h/3Dh) for authenticity check. Use Value: OTP architecture prevents accidental overwrite during service; 12.75 V programming voltage provides clear physical separation from normal operating rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-90DC | 90 ns access, 5 V read, but requires 21 V programming voltage and lacks PRESTO IIB algorithm | Higher programming voltage increases system complexity; no margin-mode verify reduces long-term reliability confidence | Select only if existing programmer infrastructure supports 21 V and legacy AMI process compatibility is mandatory |
| AT27C512R-90JU | 90 ns access, 5 V read, 12.5 V programming, but uses 32-pin TSOP instead of PLCC32; no Electronic Signature | Surface-mount TSOP footprint incompatible with through-hole PLCC sockets; no auto-ID capability for programming equipment | Choose only for new PCB designs targeting density savings and automated assembly; not suitable for socketed legacy replacements |
Compared with AM27C512-90DC and AT27C512R-90JU, the M27C512-90C1 uniquely combines PLCC32 socket compatibility, 12.75 V programming, PRESTO IIB margin verification, and Electronic Signature-making it the only drop-in replacement for ST-designed legacy systems requiring field-programmable OTP storage with traceable identity.
Availability
M27C512-90C1 is available at Aetrix Electronics and suitable for industrial PLC firmware updates, avionics configuration management, and medical device calibration table storage requiring stable component supply across extended product lifecycles.
Supply support for M27C512-90C1 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, specializing in automotive, industrial, and power management ICs with strong heritage in non-volatile memory design.
The M27C512 belongs to ST's legacy EPROM product line, engineered specifically for industrial and aerospace applications demanding proven reliability, long-term availability, and compatibility with established programming ecosystems.
FAQ
Is M27C512-90C1 UV-erasable or OTP-only?
The M27C512-90C1 is an OTP (One-Time Programmable) variant housed in a PLCC32 package, which lacks the quartz window required for UV erasure. Unlike UV-erasable versions (e.g., M27C512-90F1 in FDIP28W), this part is permanently programmed after initial write and cannot be erased or reprogrammed.
What is the correct VCC voltage during programming?
During programming, VCC must be set to 6.25 V ±0.25 V-not the 5 V used in read mode. This higher supply ensures proper internal charge pump operation and cell threshold margin. Applying 5 V during programming will result in incomplete or unreliable writes.
Can M27C512-90C1 be used in place of M27C512-90B6?
No-M27C512-90B6 uses PDIP28 packaging with different pinout and mechanical dimensions. While both share identical electrical specs and OTP functionality, the PLCC32 (C1) and PDIP28 (B6) packages are not socket- or footprint-compatible. Direct substitution requires PCB redesign or adapter hardware.
Does M27C512-90C1 support standard TTL or CMOS input levels?
Inputs A0–A15, E, and G accept TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), while GVPP and A9 require precise voltage levels during programming and Electronic Signature modes (12.75 V and 12.0 V respectively). Output drive matches TTL loads (IOL = 2.1 mA, IOH = –1 mA).
M27C512-90C1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- 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:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (11.43x13.97)
M27C512-90C1 FAQ
1.How can I place an order for M27C512-90C1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C512-90C1 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 M27C512-90C1 reliable?
The price and inventory of M27C512-90C1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C512-90C1 is usually 5 days.
3.What payment methods are accepted for M27C512-90C1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C512-90C1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C512-90C1?
M27C512-90C1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C512-90C1 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 M27C512-90C1?
For technical support, including M27C512-90C1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C512-90C1 requirements.
6.How does Aetrix verify that M27C512-90C1 is sourced from the original manufacturer or authorized distributors?
All M27C512-90C1 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 M27C512-90C1 meets industry standards.
7.What is the process for return or replacement of M27C512-90C1?
All M27C512-90C1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C512-90C1, 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 M27C512-90C1 part is unused and in its original packaging.
Return procedure for M27C512-90C1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C512-90C1 Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
-
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
-
AT24CS02-SSHM-T
Microchip Technology
-
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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