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STMicroelectronics M27C512-90B6
- Part No.:
- M27C512-90B6
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
M27C512-90B6.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,889
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Product details
Overview
M27C512-90B6 from STMicroelectronics is a 512 Kbit (64K × 8) OTP EPROM in PDIP28 package, operating at 5V ±10%, with 90 ns access time, 30 mA active current, and 100 µA standby current. It supports TTL-level addressing and data I/O, uses two-line output control (E and G), and is designed for embedded firmware storage in legacy industrial controllers and boot memory applications.
For engineers reviewing the M27C512-90B6 datasheet, M27C512-90B6 pinout, M27C512-90B6 application, or M27C512-90B6 equivalent, key selection criteria include verified 90 ns read timing under TTL conditions, PDIP28 mechanical compatibility with through-hole PCB layouts, OTP programming margin at 12.75 V VPP, and electronic signature (20h/3Dh) for automated programmer recognition.
Technical Context
The M27C512-90B6 implements a CMOS-based OTP EPROM architecture with dual-control read enable (E = chip enable, G = output enable), enabling low-power array partitioning in multi-device memory systems. Its PRESTO IIB programming algorithm guarantees full-array programming in ≤6.5 s with margin-mode verification at 6.25 V VCC.
It features electronic signature mode activated by 11.5–12.5 V on A9, returning manufacturer code 20h and device code 3Dh on Q7–Q0. The device operates across –40°C to +125°C ambient, supports 0.4 V VOL at 2.1 mA sink, and maintains 3.6 V VOH (TTL) and VCC–0.7 V VOH (CMOS) output levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - fixed parallel organization; no address multiplexing required. |
| Access Time | 90 ns (tAVQV, tELQV) - guaranteed read latency under TTL input conditions at 5 V. |
| Supply Voltage | 5 V ±10% (read), 6.25 V ±0.25 V (program) - separate VCC requirements for read vs. program modes. |
| Active Current | 30 mA - measured at 5 MHz toggle rate; defines power budget for sustained read operation. |
| Standby Current | 100 µA - achieved with E = VIH; enables low-quiescent power in idle microcontroller boot paths. |
| Programming Voltage | 12.75 V ±0.25 V on GVPP - precise high-voltage supply required for oxide breakdown during OTP write. |
| Electronic Signature | Manufacturer code 20h, Device code 3Dh - read via A9=12 V and A0 toggling; used for auto-algorithm selection in programmers. |
Pinout & Package
Package: PDIP28 (Plastic Dual In-line Package, 600 mil width, 28-pin, RoHS-compliant ECOPACK®).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus; TTL-compatible inputs; fully decoded to select one of 65,536 bytes. |
| Q0–Q7 | Data Outputs | 8-bit bidirectional data bus in programming mode; outputs only in read mode; 3-state controlled by E and G. |
| E | Chip Enable | Primary device-select signal; VIH places device in standby (100 µA); VIL enables internal logic and memory array. |
| G | Output Enable | Secondary output gate; VIL enables Q0–Q7 drivers; allows shared G line across multiple EPROMs without bus contention. |
| VCC | Supply Voltage | +5 V ±10% for read; must be applied before/with VPP and removed after VPP during programming. |
| VSS | Ground | Reference return for all signals; requires local 0.1 µF ceramic decoupling per device. |
| GVPP | Program Supply Input | Accepts 12.75 V ±0.25 V during programming; internally routed to bitline drivers for Fowler-Nordheim injection. |
| A9 | Signature Address Line | Bias to 11.5–12.5 V to enter Electronic Signature mode; not used in normal read/program operations. |
Key Features
| Feature | Design Value |
|---|---|
| Two-line output control (E + G) | Enables zero-bus-contention memory expansion: E selects device, G gates outputs-critical for multi-EPROM boot ROMs. |
| PRESTO IIB programming algorithm | Reduces full-array programming to ≤6.5 s with built-in margin-mode verify-eliminates over-programming pulses and improves cell endurance. |
| Electronic Signature (20h/3Dh) | Enables automatic device identification in universal programmers-no manual part selection needed during production programming. |
| ECOPACK® packaging | PB-free PDIP28 compliant with JEDEC JESD97; lead finish marked on inner box label; supports lead-free reflow and hand-soldering. |
| Wide temperature range | –40°C to +125°C operation-validated for use in industrial PLCs, motor drives, and automotive body control modules. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic firmware in DIN-rail mounted programmable logic controllers requiring field-replaceable nonvolatile memory. IC Role / Device Role / Timing Role: Primary boot-time instruction store; accessed sequentially during CPU reset vector fetch; 90 ns access ensures no wait states on 8/16-bit bus interfaces. Use Value: OTP configuration prevents accidental overwrite; PDIP28 socket compatibility enables quick field firmware swaps without rework. |
Use Scenario: Holding immutable startup code for Z80, 8051, or 68K-based embedded systems where flash replacement is cost-prohibitive. IC Role / Device Role / Timing Role: Memory-mapped ROM mapped to 0x0000–0xFFFF; E tied to CPU address decoder; G driven by RD# signal for cycle-accurate timing. Use Value: 100 µA standby current extends battery-backed operation during power-loss events; TTL I/O eliminates level-shifter components. |
| Automotive Body Control Module | Medical Equipment Configuration Memory |
|
Use Scenario: Storing calibration tables and safety-critical initialization parameters in dashboard control units operating in under-hood environments. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-on self-test; read-only during runtime; E asserted only during diagnostic reads. Use Value: –40°C to +125°C rating meets AEC-Q100 Grade 2 requirements; ECOPACK® compliance satisfies automotive RoHS mandates. |
Use Scenario: Retaining FDA-approved device configuration settings (e.g., infusion pump flow rates, ECG gain factors) that must survive 10+ year product lifecycle. IC Role / Device Role / Timing Role: Write-once configuration vault; programmed during final test; accessed via isolated SPI-to-parallel bridge for safety isolation. Use Value: OTP permanence eliminates risk of EEPROM wear-out or flash corruption; electronic signature validates authenticity during regulatory audit. |
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, PDIP28, but uses AMD's proprietary programming algorithm and signature codes (01h/3Dh); higher ICC1 standby current (200 µA). | Requires AMD-specific programmer firmware; not recognized by ST-optimized tools; identical pinout and timing. | Select only if existing toolchain supports AMD signature and margin verification. |
| MX27C512-90PC | 90 ns access, 5 V, PDIP28, Macronix OTP EPROM; compatible signature (20h/3Dh); lower VPP tolerance (12.5 V ±0.5 V). | Validated for same industrial temperature range; slightly looser VPP spec increases risk of incomplete programming at edge conditions. | Prefer for cost-sensitive volume builds where ST's tighter 12.75 V ±0.25 V VPP control is unavailable. |
Compared with AM27C512-90DC and MX27C512-90PC, the M27C512-90B6 offers tighter VPP regulation, lower standby current, and native integration with ST's PRESTO IIB algorithm-making it optimal for reliability-critical, long-lifecycle designs where programming yield and thermal stability are prioritized.
Availability
M27C512-90B6 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROMs, and automotive body control module configuration requiring stable component supply across extended product lifecycles.
Supply support for M27C512-90B6 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 microcontrollers, power management, and nonvolatile memory solutions for industrial, automotive, and consumer markets.
The M27C512 belongs to ST's legacy OTP EPROM product line, engineered for high-reliability, long-lifecycle applications where firmware immutability, wide temperature operation, and compatibility with standard TTL-based memory buses are essential.
FAQ
What programming voltage and timing does M27C512-90B6 require?
The M27C512-90B6 requires 12.75 V ±0.25 V on GVPP and 6.25 V ±0.25 V on VCC during programming. Programming uses PRESTO IIB algorithm with 100 µs pulses per byte and full-array completion in ≤6.5 s. A dedicated high-voltage programmer with A9 bias capability is mandatory-standard 5 V-only programmers cannot activate electronic signature or program the device.
Can M27C512-90B6 be used as a drop-in replacement for UV-erasable M27C512 variants?
No. The M27C512-90B6 is OTP-only and lacks the quartz window and UV-erasable floating-gate structure. It shares pinout and AC timing with UV versions but cannot be erased or reprogrammed. Substitution requires firmware revalidation and confirmation that field updates are unnecessary-OTP commitment is irreversible.
How is the electronic signature verified during production programming?
Electronic signature is verified by applying 12 V to A9 while holding all other addresses low, then toggling A0 to read Q7–Q0. Byte 0 (A0 = low) must return 00100000b (20h), and byte 1 (A0 = high) must return 00111101b (3Dh). This confirms correct device identity before initiating programming-preventing misprogramming of incompatible EPROMs.
What decoupling capacitors are required for stable M27C512-90B6 operation?
Each M27C512-90B6 requires a 0.1 µF ceramic capacitor placed between VCC and VSS, mounted within 5 mm of the pins. For every eight devices, a 4.7 µF bulk electrolytic capacitor must be added near the board's main VCC entry point. These suppress transient current spikes during E and G transitions and prevent supply droop-induced read errors.
M27C512-90B6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
M27C512-90B6 FAQ
1.How can I place an order for M27C512-90B6 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C512-90B6 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 M27C512-90B6 reliable?
The price and inventory of M27C512-90B6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C512-90B6 is usually 5 days.
3.What payment methods are accepted for M27C512-90B6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C512-90B6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C512-90B6?
M27C512-90B6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C512-90B6 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 M27C512-90B6?
For technical support, including M27C512-90B6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C512-90B6 requirements.
6.How does Aetrix verify that M27C512-90B6 is sourced from the original manufacturer or authorized distributors?
All M27C512-90B6 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 M27C512-90B6 meets industry standards.
7.What is the process for return or replacement of M27C512-90B6?
All M27C512-90B6 units undergo pre-shipment inspection (PSI). If there is an issue with M27C512-90B6, 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 M27C512-90B6 part is unused and in its original packaging.
Return procedure for M27C512-90B6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C512-90B6 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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