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STMicroelectronics M27C4001-90C1
- Part No.:
- M27C4001-90C1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
M27C4001-90C1.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,064
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Product details
Overview
M27C4001-90C1 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in PLCC32 package, operating at 5V ±10%, with 35 ns access time and dual-line output control (E/G). It delivers 30 mA active current and 100 µA standby current, and supports electronic signature (20h/41h) for automated programming system identification. It is used in legacy microprocessor-based systems requiring nonvolatile program storage with field-erasable capability.
For engineers reviewing the M27C4001-90C1 datasheet, M27C4001-90C1 pinout, M27C4001-90C1 application, or M27C4001-90C1 equivalent, key selection criteria include UV erasability, 35 ns read timing under TTL-level E/G control, PLCC32 mechanical compatibility, 12.75 V programming voltage, and electronic signature verification for production programming validation.
Technical Context
The M27C4001-90C1 implements a two-line output enable architecture: Chip Enable (E) controls power state and device selection, while Output Enable (G) gates data to Q0–Q7 independently - enabling low-power array partitioning without bus contention. Its PRESTO II programming algorithm applies 100 µs pulses per byte with margin-mode verify at 6.25 V VCC and 12.75 V VPP.
It supports Electronic Signature mode via 11.5–12.5 V on A9 (with VCC = VPP = 5 V) to output manufacturer code 20h and device code 41h on Q7–Q0. Erasure requires ≥15 W·sec/cm² UV dose (2537 Å) for 15–20 min exposure within 2.5 cm of lamp, with room-light erasure risk over years.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (524,288 × 8), organized as 19-bit address space (A0–A18) |
| Access Time | 35 ns max (tAVQV, tELQV) at 5 V, enabling compatibility with 25 MHz bus cycles |
| Supply Voltage (Read) | 5 V ±10%; supports standard TTL/CMOS system rails without regulation |
| Programming Voltage | VPP = 12.75 V ±0.25 V; requires dedicated HV supply separate from VCC |
| Standby Current | 100 µA (CMOS E high); reduces idle power in multi-chip memory banks |
| Electronic Signature | Manufacturer Code 20h, Device Code 41h; enables auto-algorithm selection in gang programmers |
| UV Erase Dose | ≥15 W·sec/cm² at 2537 Å; defines minimum lamp intensity × time for full bit reset |
Pinout & Package
PLCC32 (Plastic Leaded Chip Carrier, 32-pin, J-lead, 11.43 mm × 13.97 mm body) with gull-wing leads and JEDEC MO-047AC compliance. Pin 1 marked by corner notch; pin 17 is VSS (ground), pin 32 is VCC (supply), pin 16 is VPP (programming voltage).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit parallel address bus; A9 doubles as Electronic Signature activation input when biased to 11.5–12.5 V |
| Q0–Q7 | Data Outputs | 8-bit bidirectional data bus; outputs valid only when E = L and G = L; high-Z when either control is high |
| E | Chip Enable | Primary device select; VIH > VCC – 0.2 V places device in 100 µA standby; pulsed low during programming |
| G | Output Enable | Secondary output gate; independent of E; allows shared G-bus across memory array while keeping deselected chips in standby |
| VPP | Programming Supply | 12.75 V ±0.25 V input required only during programming/verify; must be applied after VCC and removed before VCC |
| VCC | Supply Voltage | 5 V ±10% for read; 6.25 V ±0.25% for programming; decoupling requires 0.1 µF ceramic + 4.7 µF bulk per 8 devices |
| VSS | Ground | Reference for all I/O and supply pins; common return path for ICC and IPP currents |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line output control (E/G) | Enables zero-bus-contention memory expansion: E selects chip, G enables outputs - allowing shared G-bus and per-chip E decoding |
| PRESTO II programming | Guarantees cell margin without overprogramming: 100 µs pulses + margin-mode verify eliminates need for post-program trimming |
| Electronic Signature (20h/41h) | Allows fully automated device recognition in production programmers - no manual part selection or algorithm loading required |
| UV-erasable windowed option | FDIP32W variant supports unlimited reprogramming via 2537 Å UV exposure; critical for firmware development and prototyping |
| ECOPACK® compliance | Lead-free PLCC32 packaging meets RoHS and JEDEC JESD97 interconnect marking requirements |
Applications
| Industrial PLC Firmware Storage | Avionics Boot ROM |
|---|---|
Use Scenario: Storing fixed boot code and motion-control logic in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into CPU address space; accessed during cold start and watchdog recovery sequences. Use Value: 35 ns access time ensures deterministic boot latency; UV erasability allows field updates of safety-critical firmware without board replacement. | Use Scenario: Holding certified flight software and configuration tables in airborne computing modules subject to DO-254 design assurance. IC Role / Device Role / Timing Role: Read-only memory executing Power-On Self-Test (POST) and initializing ARINC 429 interfaces prior to OS load. Use Value: Electronic signature (20h/41h) validates correct device insertion pre-flight; ECOPACK® compliance satisfies aerospace Pb-free mandates. |
| Military Communications Radio BIOS | Legacy Test Equipment Microcode |
Use Scenario: Storing secure radio initialization routines and cryptographic key loaders in tactical HF/VHF transceivers. IC Role / Device Role / Timing Role: Secure boot ROM accessed exclusively by on-chip controller; isolated from host processor data bus during normal operation. Use Value: 100 µA standby current extends battery life in manpack radios; UV window enables secure rekeying in controlled facilities. | Use Scenario: Hosting calibration microcode and instrument-specific command parsers in discontinued benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Fixed-function instruction store for embedded 8051-compatible microcontroller managing front-panel and GPIB interface logic. Use Value: PLCC32 footprint matches original PCB layout; 5 V operation avoids level-shifter redesign; 35 ns timing preserves real-time trigger response. |
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, same 4 Mbit ×8 organization, but uses AMD's proprietary programming algorithm and signature codes (01h/41h) | Requires AMD-specific programmer firmware; not recognized by ST-certified PRESTO II tools | Select only if existing AMD toolchain and firmware infrastructure is in place |
| AT27C4001-90JU | 90 ns access time (slower), same PLCC32 package, Atmel electronic signature (1Fh/41h), 12 V VPP | Lacks PRESTO II margin-mode verify; longer programming time per byte; lower speed limits bus frequency compatibility | Acceptable for cost-sensitive, non-time-critical legacy replacements where 35 ns timing is not required |
Compared with AM27C4001-35JC, M27C4001-90C1 offers guaranteed margin programming and ST-specific signature validation; versus AT27C4001-90JU, it delivers 2.6× faster read access and robust verify methodology - critical for real-time boot and diagnostic execution.
Availability
M27C4001-90C1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, avionics boot ROM, and military communications radio BIOS requiring stable component supply amid long-lifecycle product support.
Supply support for M27C4001-90C1 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, Switzerland, 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 mission-critical embedded systems where field-upgradable nonvolatile storage and long-term data retention (>10 years) are mandatory.
FAQ
What is the function of the A9 pin beyond addressing?
A9 serves a dual role: during normal operation, it is an address input; during Electronic Signature mode, it accepts 11.5–12.5 V to activate manufacturer/device code readout on Q7–Q0. This voltage must be applied with VCC = VPP = 5 V and all other address lines held low. It is not used for programming or erasure.
Can M27C4001-90C1 be programmed using standard 5 V-only programmers?
No. Programming requires VPP = 12.75 V ±0.25 V applied to pin 16, VCC = 6.25 V ±0.25 V, and precise 100 µs E-pulse timing per byte. Standard 5 V programmers lack HV generation and PRESTO II algorithm support, risking incomplete or marginal programming.
Is the PLCC32 package of M27C4001-90C1 RoHS-compliant?
Yes. The M27C4001-90C1 uses ST's ECOPACK®-compliant PLCC32 package, which is lead-free and conforms to RoHS Directive 2011/65/EU. JEDEC JESD97 second-level interconnect markings are present on the package body and inner box label.
How does standby current differ between TTL and CMOS E-input thresholds?
When E is driven to VIH (> VCC – 0.2 V), standby current is 100 µA (CMOS mode); when E is driven to TTL-high (≥ 2 V), standby current rises to 1 mA (ICC2 vs. ICC1 in datasheet). For lowest power, use CMOS-level E drive - critical in battery-backed or thermally constrained systems.
M27C4001-90C1 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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (11.35x13.89)
M27C4001-90C1 FAQ
1.How can I place an order for M27C4001-90C1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4001-90C1 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 M27C4001-90C1 reliable?
The price and inventory of M27C4001-90C1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-90C1 is usually 5 days.
3.What payment methods are accepted for M27C4001-90C1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-90C1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4001-90C1?
M27C4001-90C1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4001-90C1 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 M27C4001-90C1?
For technical support, including M27C4001-90C1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-90C1 requirements.
6.How does Aetrix verify that M27C4001-90C1 is sourced from the original manufacturer or authorized distributors?
All M27C4001-90C1 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 M27C4001-90C1 meets industry standards.
7.What is the process for return or replacement of M27C4001-90C1?
All M27C4001-90C1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-90C1, 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 M27C4001-90C1 part is unused and in its original packaging.
Return procedure for M27C4001-90C1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C4001-90C1 Tags
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