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STMicroelectronics M27C4001-90C6
- Part No.:
- M27C4001-90C6
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
M27C4001-90C6.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
M27C4001-90C6 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in PLCC32 package, operating at 5V ±10%, with 35 ns access time, 30 mA active current, and 100 µA standby current. It supports two-line output control (E/G), electronic signature (20h/41h), and PRESTO II programming (100 µs/word at 12.75 V). Used in legacy microprocessor systems for firmware storage where field erasure via UV light is required.
For engineers reviewing the M27C4001-90C6 datasheet, M27C4001-90C6 pinout, M27C4001-90C6 application, or M27C4001-90C6 equivalent, key selection criteria include UV-erasability, TTL-compatible timing, dual-control read enable, ECOPACK® compliance, and PLCC32 mechanical compatibility with socketed embedded controllers.
Technical Context
The M27C4001-90C6 implements a standard NMOS EPROM architecture with address decoding across A0–A18 (524,288 locations), data I/O on Q0–Q7, and independent chip enable (E) and output enable (G) inputs enabling low-power array partitioning. Its logic diagram confirms full TTL-level input compatibility except for A9 during Electronic Signature mode (11.5–12.5 V).
Programming requires VPP = 12.75 V ±0.25 V, VCC = 6.25 V ±0.25 V, and E-pulsed low while G held high; verify uses VPP = 12.75 V with E = VIH and G = VIL. Erasure relies on 2537 Å UV exposure (≥15 W·s/cm²) through the PLCC window - a physical feature confirmed for C-suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (524,288 × 8 bits) - supports full 16-bit bus interfaces with byte-wide data access. |
| Access Time | 35 ns - guarantees sub-28.6 MHz read cycle compatibility in synchronous microprocessor buses. |
| Supply Voltage (Read) | 5 V ±10% - operates directly from standard logic rails without regulation overhead. |
| Active Current | 30 mA at 5 MHz - enables thermal budgeting for multi-device memory banks in industrial controllers. |
| Standby Current | 100 µA - allows >10-year data retention in battery-backed systems with CMOS E-input bias. |
| Programming Voltage | 12.75 V ±0.25 V - requires dedicated HV supply but avoids external charge pumps due to internal margin circuitry. |
| Electronic Signature | Manufacturer Code 20h / Device Code 41h - enables automated programmer identification without manual part selection. |
Pinout & Package
PLCC32 (C-suffix) package: 32-pin plastic leaded chip carrier, 11.43 mm × 13.97 mm body, J-lead profile, surface-mount compatible with reflow or socketed prototyping. Windowless variant not applicable - UV erasure requires FDIP32W; C-suffix is OTP-only per ST documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word decode; A9 doubles as Electronic Signature trigger when biased to 12 V. |
| Q0–Q7 | Data Outputs | True TTL-compatible outputs (VOH ≥ 2.4 V, VOL ≤ 0.4 V @ 2.1 mA) - drive standard 50 Ω terminated buses. |
| E | Chip Enable | Primary device select: VIH ≥ 2 V places device in standby (100 µA); VIL ≤ 0.8 V enables read/program modes. |
| G | Output Enable | Secondary gating: controls output buffer state independently of E - prevents bus contention in multi-chip arrays. |
| VPP | Programming Supply | 12.75 V input required only during programming/verify; must be applied after VCC and removed before VCC. |
| VCC | Power Supply | 5 V ±10% for read; 6.25 V ±0.25% for programming - separate voltage domains prevent read-mode corruption during program cycles. |
| VSS | Ground | Single ground reference for all I/O and power pins - decoupling requires 0.1 µF ceramic placed <2 mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| Two-Line Output Control (E + G) | Enables hierarchical memory banking: E selects device (low-power standby), G gates output (bus arbitration), eliminating contention in 8+ device arrays. |
| PRESTO II Programming Algorithm | Guarantees cell margin without overprogramming: 100 µs pulses + automatic verify-in-margin mode ensures >10k erase/write cycles for UV variants. |
| Electronic Signature (20h/41h) | Allows zero-configuration programmer recognition: A9 = 12 V + A0 toggle reads manufacturer/device ID on Q7–Q0 - eliminates manual algorithm selection errors. |
| ECOPACK® Compliance | Lead-free PLCC32 package marked per JEDEC JESD97 - satisfies RoHS requirements without derating or thermal compromise. |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
|
Use Scenario: Storing fixed boot code and calibration tables in programmable logic controllers deployed in factory automation cabinets with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Nonvolatile instruction store mapped to CPU address space; 35 ns access meets 28.6 MHz Z80/8086 bus timing with no wait states. Use Value: UV-erasability allows field firmware updates using benchtop UV erasers; PLCC32 socket compatibility enables rapid replacement without rework. |
Use Scenario: Holding engine control logic in pre-OBD-II automotive ECUs where software revisions occur infrequently but require permanent retention over 15+ year vehicle lifetimes. IC Role / Device Role / Timing Role: Read-only memory executing startup initialization sequences; 100 µA standby current minimizes battery drain during ignition-off periods. Use Value: ECOPACK® compliance meets early EU auto recycling mandates; electronic signature prevents misprogramming during depot-level reflash operations. |
| Military Avionics Configuration Memory | Medical Imaging System Calibration Storage |
|
Use Scenario: Retaining flight-critical configuration parameters (e.g., sensor offsets, trim values) in airborne mission computers operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Static memory mapped to FPGA configuration bus; dual E/G control isolates memory during partial reconfiguration events. Use Value: 5 V ±10% operation tolerates aircraft power bus ripple; 15–20 minute UV erasure enables secure parameter reset between missions. |
Use Scenario: Archiving gamma-ray detector calibration coefficients in portable X-ray systems requiring tamper-proof, long-term bit stability under medical facility fluorescent lighting. IC Role / Device Role / Timing Role: Read-once calibration table accessed during system power-up; UV window covered with opaque label to prevent 3-year ambient erasure. Use Value: 30 mA active current aligns with imaging subsystem power budgets; PLCC32 footprint matches legacy PCB layouts for drop-in replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C4001-35JC | 35 ns access, 5 V operation, PLCC32, but AMD-manufactured with different electronic signature (01h/41h) and no PRESTO II algorithm. | Requires AMD-specific programming hardware; lacks ST's margin-verified verify mode - higher risk of marginal writes in high-temp environments. | Select only if existing AMD programmer infrastructure is in place and ST's signature-based auto-detection is unnecessary. |
| M27C4002-10F6 | Same ST die, but FDIP32W ceramic package with UV window; 100 ns access time; rated for –40°C to +125°C. | Supports field UV erasure but sacrifices speed and increases board area; intended for extended temperature military use, not commercial PLCC sockets. | Choose only when UV erasability is mandatory and 35 ns timing is noncritical - incompatible with PLCC footprints. |
Compared with AM27C4001-35JC, M27C4001-90C6 offers verified margin programming and ST-specific signature detection; versus M27C4002-10F6, it trades erasability for speed and PLCC compatibility - making it optimal for cost-sensitive, socketed commercial designs where firmware changes are infrequent.
Availability
M27C4001-90C6 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot ROM, and medical imaging system calibration storage requiring stable component supply across extended product lifecycles.
Supply support for M27C4001-90C6 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, designing and manufacturing analog, MCU, power, and memory products for industrial, automotive, and consumer markets.
The M27C4001 belongs to ST's legacy EPROM product line, engineered for reliability in microprocessor-based systems requiring field-erasable firmware storage with TTL interface compatibility and long-term data retention.
FAQ
Is M27C4001-90C6 UV-erasable?
No. The -90C6 suffix denotes PLCC32 packaging with no quartz window; it is OTP-only. UV erasure requires the FDIP32W variant (-90F6). ST explicitly states that C-suffix devices are offered "where content is programmed only one time and erasure is not required." Attempting UV exposure on -90C6 yields no effect.
What is the correct VCC voltage during programming?
VCC must be 6.25 V ±0.25 V during programming and verify operations, per Table 8. This is distinct from the 5 V ±10% used in read mode. Applying 5 V during programming risks incomplete cell charging and verify failures - ST specifies this tighter tolerance to ensure margin compliance with PRESTO II algorithm.
Can M27C4001-90C6 be used in a 3.3 V system?
No. All DC characteristics (VIH, VOL, VOH, ICC) are specified only for 5 V ±10% operation. Input thresholds (VIH ≥ 2 V) and output drive (2.4 V VOH) assume 5 V rails. Interfacing with 3.3 V logic requires level-shifting; ST does not characterize or guarantee functionality below 4.5 V.
Does M27C4001-90C6 support page programming?
No. It uses byte-wise programming: one 8-bit word per 100 µs pulse. The datasheet describes no page or burst mode - each address location must be pulsed individually. PRESTO II automates sequencing across the full array but does not reduce per-word pulse duration or enable parallel-byte writes.
M27C4001-90C6 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:
- 4Mbit
- Memory Organization:
- 512K 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:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (11.35x13.89)
M27C4001-90C6 FAQ
1.How can I place an order for M27C4001-90C6 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4001-90C6 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 M27C4001-90C6 reliable?
The price and inventory of M27C4001-90C6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-90C6 is usually 5 days.
3.What payment methods are accepted for M27C4001-90C6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-90C6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4001-90C6?
M27C4001-90C6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4001-90C6 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 M27C4001-90C6?
For technical support, including M27C4001-90C6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-90C6 requirements.
6.How does Aetrix verify that M27C4001-90C6 is sourced from the original manufacturer or authorized distributors?
All M27C4001-90C6 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 M27C4001-90C6 meets industry standards.
7.What is the process for return or replacement of M27C4001-90C6?
All M27C4001-90C6 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-90C6, 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 M27C4001-90C6 part is unused and in its original packaging.
Return procedure for M27C4001-90C6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C4001-90C6 Tags
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