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STMicroelectronics M27C1001-70B1
- Part No.:
- M27C1001-70B1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
M27C1001-70B1.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,399
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Product details
Overview
M27C1001-70B1 from STMicroelectronics is a 1 Mbit (128K × 8) UV-erasable EPROM in 32-pin PDIP package, operating at 5V ±10%, with 70 ns access time, 30 mA active current, and 100 µA standby current. It serves as non-volatile program storage in legacy microprocessor systems requiring field-erasable firmware, such as industrial PLCs and embedded controllers.
For engineers reviewing the M27C1001-70B1 datasheet, M27C1001-70B1 pinout, M27C1001-70B1 application, or M27C1001-70B1 equivalent, key selection criteria include UV-erase capability, TTL-compatible control timing (E/G dual enable), 12.75 V programming voltage, A9-based electronic signature verification, and FDIP/PDIP/LCCC/PLCC/TSOP package compatibility for socketed or surface-mount retrofits.
Technical Context
The M27C1001-70B1 implements a two-line output control architecture using Chip Enable (E) for power gating and Output Enable (G) for bus contention avoidance-enabling low-power memory arrays with deterministic high-impedance outputs during deselect. Its read mode requires simultaneous VCC and VPP application, while programming mandates VCC = 6.25 V ±0.25 V and VPP = 12.75 V ±0.25 V with 100 µs pulse width per word.
Electronic signature mode activates via 11.5–12.5 V on A9 (with VCC = VPP = 5 V), outputting manufacturer code 20h and device code 05h on Q7–Q0. Erasure requires 2537 Å UV light at ≥15 W·s/cm² dose (15–20 min at 12,000 µW/cm²), with windowed packages (FDIP32W, LCCC32W) enabling field reprogramming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 1 Mbit (131,072 × 8 bits), directly addressable via A0–A16 for byte-wide microprocessor bus interfacing |
| Access Time | 70 ns max (tAVQV), defining minimum clock cycle duration for reliable read operation in 14 MHz CPU systems |
| Supply Voltage | 5 V ±10% in read mode; supports legacy 5 V TTL/CMOS logic without level shifting |
| Programming Voltage | VPP = 12.75 V ±0.25 V, requiring dedicated HV supply rail distinct from VCC |
| Standby Current | 100 µA (CMOS E input), enabling ultra-low power retention in battery-backed systems |
| Operating Temperature | –40 °C to 85 °C (industrial grade), validated for use in programmable logic controllers and test equipment |
| Electronic Signature | Manufacturer Code 20h / Device Code 05h, enabling automatic algorithm selection in universal programmers |
Pinout & Package
Package: PDIP32 (32-pin plastic dual in-line, 600 mil width, JEDEC MS-011AC). Pin 1 index corner marked; pin 16 = VCC, pin 32 = VSS, pin 21 = VPP, pin 20 = P (Program), pin 22 = G (Output Enable), pin 23 = E (Chip Enable).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus interface; A9 used for electronic signature voltage injection (11.5–12.5 V) |
| Q0–Q7 | Data Outputs | Bi-directional data bus pins; carry programmed data during read, accept parallel input during programming |
| E | Chip Enable | Primary device select; CMOS-high (VIH > VCC – 0.2 V) forces 100 µA standby mode and Hi-Z outputs |
| G | Output Enable | Secondary output gate; enables Q0–Q7 only when E is active, preventing bus contention in multi-chip arrays |
| P | Program Control | Active-low pulse input (100 µs width); initiates programming when E = VIL and VPP = 12.75 V |
| VPP | Programming Supply | High-voltage input; must be applied simultaneously with or after VCC and removed simultaneously or before VCC |
| VCC | Supply Voltage | 5 V ±10% for read; 6.25 V ±0.25 V for programming-requires separate regulation or switching |
| VSS | Ground | Reference node for all I/O and power pins; decoupling requires 0.1 µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line output control (E + G) | Enables zero-bus-contention memory expansion with independent power-down (E) and output gating (G) |
| UV erasability | Supports unlimited reprogramming cycles via 2537 Å UV exposure (15–20 min), critical for firmware development and field updates |
| Electronic signature | Hardware-verified identification (20h/05h) eliminates manual device selection in automated programming stations |
| Presto II programming algorithm | Guarantees full-array programming in ~13 seconds with margin-mode verify, eliminating over-programming risk |
| Wide temperature range | –40 °C to 85 °C operation validated for industrial control cabinets and telecom line cards |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
Use Scenario: Storing ladder logic firmware in modular programmable logic controllers with field-replaceable memory modules. IC Role / Device Role / Timing Role: Non-volatile program memory mapped to CPU address space; accessed via synchronous 70 ns read cycles during instruction fetch. Use Value: UV-erasability allows factory and field firmware updates without PCB rework; PDIP32 socket compatibility enables hot-swap maintenance. | Use Scenario: Holding self-test routines and calibration constants in automated circuit board testers manufactured pre-2005. IC Role / Device Role / Timing Role: Boot ROM executing on power-up; decoded by 74LS138 to occupy 128 KB address window with E/G-controlled bus isolation. Use Value: 100 µA standby current extends battery backup life during idle periods; electronic signature prevents incorrect algorithm loading during reprogramming. |
| Avionics Maintenance Terminal BIOS | Medical Imaging System Diagnostic Loader |
Use Scenario: Storing diagnostic boot code and configuration tables in portable aircraft maintenance terminals certified to DO-254 Level B. IC Role / Device Role / Timing Role: Read-only memory initialized at power-on reset; accessed under strict 70 ns timing budget to meet deterministic boot latency requirements. Use Value: –40 °C to 85 °C rating ensures reliability across hangar-to-flight-deck thermal cycling; PDIP32 mechanical robustness withstands vibration testing. | Use Scenario: Loading FPGA configuration bitstreams and safety-critical diagnostic sequences in legacy MRI subsystem controllers. IC Role / Device Role / Timing Role: Secure loader memory verified via electronic signature prior to bitstream transfer; isolated by G-enable to prevent corruption during concurrent bus activity. Use Value: Presto II programming guarantees margin-safe bitcell writes, reducing field failure risk from marginal programming in production test environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C1001-70DC | Same 1 Mbit ×8 organization, 70 ns access, 5 V supply; but uses AMD's proprietary programming algorithm and signature codes (01h/05h) | Requires AMD-specific programmer firmware; not compatible with ST's Presto II flow or electronic signature detection | Select only if existing toolchain is AMD-locked and UV window package (e.g., CERDIP) is required |
| MX27C1001-70PC | Identical pinout and DC specs; differs in AC timing tolerances (tGLQV = 35 ns vs. ST's 30 ns) and erase endurance (100× vs. unlimited) | Suitable for cost-sensitive replacements where 5 ns timing margin is acceptable and field erasure frequency is low | Prefer for new designs where long-term UV erase cycle count is not critical and second-source assurance is needed |
Compared with AM27C1001-70DC and MX27C1001-70PC, the M27C1001-70B1 offers guaranteed Presto II programming margin, ST-specific electronic signature for tool interoperability, and industrial-grade temperature validation-making it optimal for maintenance-critical legacy systems requiring field firmware agility.
Availability
M27C1001-70B1 is available at Aetrix Electronics and suitable for industrial PLC firmware updates, legacy test equipment boot ROM replacement, and avionics maintenance terminal BIOS storage requiring stable component supply across extended product lifecycles.
Supply support for M27C1001-70B1 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 automotive, industrial, and power discrete solutions with vertical manufacturing capabilities.
The M27C1001 belongs to ST's legacy EPROM product line, designed specifically for field-upgradable firmware storage in microprocessor-based systems where UV erasability, socket compatibility, and deterministic timing were essential design requirements.
FAQ
What UV wavelength and exposure time are required to fully erase the M27C1001-70B1?
Full erasure requires short-wave ultraviolet light at 2537 Å wavelength with a minimum integrated dose of 15 W·s/cm². Using a standard 12,000 µW/cm² UV lamp, the device must be placed within 2.5 cm of the lamp tubes for 15–20 minutes. Room fluorescent lighting may cause partial erasure over years; direct sunlight can erase it in approximately one week.
Can the M27C1001-70B1 be programmed with standard 5 V logic levels?
No. Programming requires VPP = 12.75 V ±0.25 V applied to pin 21 and VCC = 6.25 V ±0.25 V (not 5 V) during the 100 µs programming pulse. Address and data inputs remain TTL-compatible (0–5 V), but the high-voltage VPP rail and elevated VCC are mandatory for oxide breakdown and bit-cell charging.
How does the electronic signature mode function, and what pins are involved?
Electronic signature mode activates when 11.5–12.5 V is applied to A9 (pin 10) while VCC and VPP are held at 5 V. With A0 toggled between VIL and VIH, Q7–Q0 output the manufacturer code (20h) when A0 = VIL and device code (05h) when A0 = VIH. All other address lines must be held low during this operation.
Is the M27C1001-70B1 compatible with modern 3.3 V systems?
No. The M27C1001-70B1 is strictly a 5 V device: its input thresholds (VIH = 2 V, VIL = 0.8 V), output drive (2.4 V VOH at –400 µA), and internal logic are designed for 5 V TTL/CMOS interfaces. Interfacing with 3.3 V systems requires level-shifting buffers and separate 5 V supply rails for VCC/VPP.
M27C1001-70B1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-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:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
M27C1001-70B1 FAQ
1.How can I place an order for M27C1001-70B1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C1001-70B1 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 M27C1001-70B1 reliable?
The price and inventory of M27C1001-70B1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C1001-70B1 is usually 5 days.
3.What payment methods are accepted for M27C1001-70B1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C1001-70B1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C1001-70B1?
M27C1001-70B1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C1001-70B1 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 M27C1001-70B1?
For technical support, including M27C1001-70B1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C1001-70B1 requirements.
6.How does Aetrix verify that M27C1001-70B1 is sourced from the original manufacturer or authorized distributors?
All M27C1001-70B1 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 M27C1001-70B1 meets industry standards.
7.What is the process for return or replacement of M27C1001-70B1?
All M27C1001-70B1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C1001-70B1, 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 M27C1001-70B1 part is unused and in its original packaging.
Return procedure for M27C1001-70B1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C1001-70B1 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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