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STMicroelectronics M27C256B-10C6TR
- Part No.:
- M27C256B-10C6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
M27C256B-10C6TR.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,557
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Product details
Overview
M27C256B-10C6TR from STMicroelectronics is a 256 Kbit (32K × 8) UV-erasable EPROM with 5V ±10% supply, 100 ns access time, 30 mA active current, and 100 µA standby current. It features dual-line control (E/G), electronic signature (20h/8Dh), and supports programming at 12.75 V with 100 µs/word pulse width - used in legacy microprocessor boot memory and industrial firmware storage.
For engineers reviewing the M27C256B-10C6TR datasheet, M27C256B-10C6TR pinout, M27C256B-10C6TR application, or M27C256B-10C6TR equivalent, key selection criteria include UV-erase capability, TTL-compatible I/O timing, 28-pin PDIP package compatibility, and verified electronic signature readout for automated programming systems.
Technical Context
The M27C256B-10C6TR implements a two-line output control architecture using Chip Enable (E) for power gating and Output Enable (G) for bus contention prevention - enabling low-power array operation and deterministic high-impedance states during deselect. Its internal UV-erasable floating-gate cell structure requires 2537 Å ultraviolet exposure (≥15 W·s/cm²) for full bit reset.
Programming occurs under 12.75 V ±0.25 V on VPP with 6.25 V ±0.25 V on VCC, applying 100 µs pulses per byte while verifying in margin mode to ensure reliable threshold voltage margin without overprogramming. Electronic signature mode activates via 11.5–12.5 V on A9 at 25°C ±5°C to read manufacturer (20h) and device (8Dh) codes on Q7–Q0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8) - fixed parallel organization compatible with 8-bit data buses and standard address decoders. |
| Access Time | 100 ns - guaranteed maximum tAVQV delay under standard AC conditions (100 pF load, 0.4–2.4 V input swing), defining minimum CPU wait-state requirements. |
| Supply Voltage | 5 V ±10% - supports legacy 5 V TTL/CMOS systems without regulation overhead; VPP = 12.75 V ±0.25 V required only during programming. |
| Active Current | 30 mA at 5 MHz - establishes thermal and PCB trace design limits for sustained read operation in multi-device memory banks. |
| Standby Current | 100 µA - enables low-quiescent power retention in battery-backed or infrequently accessed firmware storage applications. |
| Programming Voltage | 12.75 V ±0.25 V on VPP - precise voltage requirement ensures oxide stress control and cell threshold consistency across production lots. |
| Electronic Signature | Manufacturer Code 20h, Device Code 8Dh - enables automatic algorithm selection in universal EPROM programmers via A9 high-voltage activation. |
Pinout & Package
Package: PDIP28 (plastic dual in-line, 600 mil width, RoHS-compliant lead finish). Pin count and mechanical dimensions conform to JEDEC MS-011AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting TTL-level signals; A9 serves dual role as electronic signature enable when driven 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-impedance when either control is high. |
| E | Chip Enable | Primary device-select signal; CMOS-high (VIH > VCC – 0.2 V) places device in 100 µA standby; TTL-low enables read/program functions. |
| G | Output Enable | Secondary output gate; independent of E, allows shared G-bus across memory arrays to prevent bus contention while keeping devices powered. |
| VPP | Programming Supply | 12.75 V ±0.25 V input - must be applied simultaneously with or after VCC and removed simultaneously or before VCC to avoid latch-up. |
| VCC | Supply Voltage | 5 V ±10% for read mode; 6.25 V ±0.25 V for programming - strict sequencing prevents internal charge pump damage. |
| VSS | Ground | Reference return for all inputs, outputs, and supplies; requires local 0.1 µF ceramic decoupling per device per STMicroelectronics layout guidelines. |
| NC | No Connect | Internally unconnected pins (e.g., PLCC32 pin 12); must remain floating - no external bias or routing permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line output control (E + G) | Enables zero-bus-contention memory expansion: E selects device power state, G gates output drivers - critical for stable 80x86/68k system boot ROMs. |
| UV-erasable architecture | FDIP28W variant includes quartz window for field erasure (15–20 min @ 12 mW/cm², 2537 Å); PDIP28 variant is OTP-only - material choice defines reprogrammability. |
| Electronic signature (20h/8Dh) | Allows automated programmer identification without manual part selection - reduces firmware flashing errors in high-mix manufacturing environments. |
| PRESTO II programming algorithm | Guarantees margin-safe programming via 100 µs pulses and real-time verify-in-margin - eliminates need for post-program burn-in or extended test cycles. |
| Wide temperature range | –40°C to 85°C operation (C6 suffix) - validated for industrial control panels and telecom line cards where ambient thermal cycling exceeds commercial grade. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O mapping in programmable logic controllers deployed in factory automation cabinets with 0–70°C ambient swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU address space 0x0000–0x7FFF; provides deterministic 100 ns read access during cold start initialization. Use Value: UV-erasable version allows field firmware updates via quartz-window exposure; PDIP28 packaging enables socket-based replacement without rework. |
Use Scenario: Holding startup code and interrupt vectors for Z80 or 8085-based embedded systems in medical diagnostic equipment requiring long-term data retention. IC Role / Device Role / Timing Role: Primary read-only instruction store; synchronized to CPU clock via E/G handshaking to eliminate wait states in 5 MHz operation. Use Value: 100 µA standby current extends battery backup life in off-grid devices; electronic signature prevents misprogramming during service depot reflashing. |
| Telecom Line Card Configuration | Avionics Maintenance Interface |
|
Use Scenario: Storing hardware configuration tables and protocol stacks in T1/E1 interface cards operating in NEBS-compliant central office environments. IC Role / Device Role / Timing Role: Static configuration memory accessed during card power-up sequence; isolated from dynamic RAM by dedicated address decode. Use Value: –40°C to 85°C rating (C6) ensures reliability across temperature-controlled and uncontrolled telecom racks; PDIP28 simplifies hot-swap module replacement. |
Use Scenario: Holding aircraft-specific calibration constants and fault-tree logic in portable maintenance laptops interfacing with legacy ARINC-429 avionics buses. IC Role / Device Role / Timing Role: Read-only parameter store accessed via ISA-bus adapter; verified signature ensures correct part loading before flight-critical software execution. Use Value: PRESTO II programming guarantees bit-level margin safety - essential for DO-178B Level C software certification evidence traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-120DC | 120 ns access time; 5 V ±5% VCC tolerance; identical 28-pin PDIP footprint and pinout. | Lower speed grade suitable for sub-8 MHz systems; tighter VCC tolerance improves noise immunity in noisy industrial settings. | Select when system timing budget allows longer access latency and board-level regulation supports ±5% rails. |
| AT27C256B-10JU | Same 100 ns speed and 256 Kbit density; PLCC32 package (32-pin) instead of PDIP28; 3.3 V tolerant I/O but 5 V VPP required. | Surface-mount alternative for space-constrained designs; requires PCB redesign due to different pin count and package outline. | Choose for new designs targeting higher board density; not drop-in replaceable for existing PDIP28 sockets. |
Compared with AM27C256B-120DC, M27C256B-10C6TR delivers faster timing headroom for 8–10 MHz CPU interfaces; versus AT27C256B-10JU, it avoids SMT rework but lacks 3.3 V I/O compatibility - making it optimal for legacy through-hole repair and field-erasable firmware updates.
Availability
M27C256B-10C6TR is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and telecom line card configuration requiring stable component supply across extended product lifecycles.
Supply support for M27C256B-10C6TR 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 broad analog and microcontroller portfolios.
The M27C256B belongs to ST's legacy EPROM product line designed for long-lifecycle, high-reliability firmware storage in industrial control, telecom infrastructure, and avionics - emphasizing UV erasability, wide temperature operation, and programming robustness.
FAQ
What is the difference between the 'C6' and 'C1' temperature suffixes in M27C256B-10C6TR?
The 'C6' suffix indicates an operating temperature range of –40°C to +85°C, validated for industrial environments with thermal cycling and extended uptime. The 'C1' variant is rated for 0°C to +70°C - suitable only for commercial-grade applications like desktop peripherals. Both share identical electrical specs and pinout, but C6 undergoes additional temperature screening and qualification testing per AEC-Q100 stress profiles.
Can M27C256B-10C6TR be programmed in-circuit, or does it require a dedicated EPROM programmer?
M27C256B-10C6TR requires a dedicated EPROM programmer that supplies 12.75 V ±0.25 V to VPP and applies precise 100 µs pulses with verify-in-margin functionality. In-circuit programming is not supported - VPP cannot be safely generated from standard 5 V system rails, and the PRESTO II algorithm relies on controlled voltage ramping and margin-mode verification unavailable in typical MCU-based jigs.
Is the PDIP28 package of M27C256B-10C6TR lead-free and RoHS compliant?
Yes, the PDIP28 package used in M27C256B-10C6TR carries RoHS-compliant matte tin lead finish per STMicroelectronics specification document AN2891. It meets EU Directive 2011/65/EU and contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits - confirmed by ST's certified material declarations dated 2022.
How does the electronic signature mode function, and what equipment is needed to read it?
Electronic signature mode activates when 11.5–12.5 V is applied to A9 while VCC = VPP = 5 V and ambient temperature is 25°C ±5°C. Toggling A0 reads Manufacturer Code (20h) at A0 = L and Device Code (8Dh) at A0 = H on Q7–Q0. This requires a programmer with high-voltage A9 drive capability - standard logic analyzers or multimeters cannot generate the required 12 V level on address lines.
M27C256B-10C6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 100 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)
M27C256B-10C6TR FAQ
1.How can I place an order for M27C256B-10C6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C256B-10C6TR 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 M27C256B-10C6TR reliable?
The price and inventory of M27C256B-10C6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C256B-10C6TR is usually 5 days.
3.What payment methods are accepted for M27C256B-10C6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C256B-10C6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C256B-10C6TR?
M27C256B-10C6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C256B-10C6TR 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 M27C256B-10C6TR?
For technical support, including M27C256B-10C6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C256B-10C6TR requirements.
6.How does Aetrix verify that M27C256B-10C6TR is sourced from the original manufacturer or authorized distributors?
All M27C256B-10C6TR 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 M27C256B-10C6TR meets industry standards.
7.What is the process for return or replacement of M27C256B-10C6TR?
All M27C256B-10C6TR units undergo pre-shipment inspection (PSI). If there is an issue with M27C256B-10C6TR, 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 M27C256B-10C6TR part is unused and in its original packaging.
Return procedure for M27C256B-10C6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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