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M27C256B-70C6

Name: M27C256B-70C6
Rating: 4.7 (12 reviews)

IC EPROM 256KBIT PARALLEL 32PLCC

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Mfr。パート #M27C256B-70C6
パッケージ 32-LCC (J-Lead)
データシート
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仕様

Supplier	STMicroelectronics
Package	Tray
ProductStatus	Obsolete
MemoryType	Non-Volatile
MemoryFormat	EPROM
Technology	EPROM - OTP
MemorySize	256Kb (32K x 8)
MemoryInterface	Parallel
AccessTime	70 ns
Voltage-Supply	4.5V ~ 5.5V
OperatingTemperature	-40°C ~ 85°C (TA)
MountingType	Surface Mount
Package/Case	32-LCC (J-Lead)

概要

Description

M27C256B-70C6 is a 256-kbit UV-erasable EPROM (not EEPROM). Key points:
- Organization: 32K × 8 (A0–A14 address lines; D0–D7 data lines)
- Speed/packaging: 70 ns access time; typically available in 28-pin DIP/SOIC; “C6” is a package/grade code and indicates commercial temp range
- Power: Vcc = 5V; Vpp (programming) ≈ 12.5V; erased by UV exposure (windowed device)
- Operation: Read when CE and OE are active; programming via a PROM programmer with the proper Vpp and control sequencing (not typically reprogrammable in-circuit)
- Use: firmware ROMs, boot code for microcontrollers, graphics/game cartridges, etc.
Note: It’s a one-time-programmable UV EPROM; erasing requires UV light, and reprogramming requires an EPROM programmer.

Features

Key features of M27C256B-70C6 (256 Kbit EPROM, 32K x 8):
- 256 Kbit UV-erasable EPROM: 32K x 8 organization
- 5V single-supply operation; TTL-compatible I/O
- Access time: 70 ns (speed grade -70)
- Programming voltage: VPP = ~12.5V
- UV erase: erase with ultraviolet light (reprogrammable via PROM programmer)
- 15 address inputs (A0–A14); 8 data I/O (D0–D7)
- Control pins: Chip Enable (CE), Output Enable (OE), Write Enable (WE)
- 32-pin package options (DIP32/SO32); suffix -C6 indicates package/style variant
- Non-volatile memory with long data retention; random/byte-wide access
- In-system use via CE/OE/WE during programming; standard EPROM interface

Package

28-pin DIP (PDIP) package.

Pinout

- Pin count: 28 pins (DIP-28, also available in other 28‑pin packages)
- Function: 256 kbit UV-EPROM (PROM) with parallel interface, 32K × 8 organization. Address inputs A0–A14, data I/O D0–D7, control pins CE and OE, supply Vcc (5V) and programming voltage Vpp (≈12.5V). Read mode uses CE/OE with Vcc; programming uses Vpp. The “-70” indicates 70 ns access time.

Manufacturer

- Manufacturer: STMicroelectronics (ST)
- What kind of company: A multinational electronics and semiconductor company that designs and manufactures integrated circuits, memory, sensors, microcontrollers, and other semiconductor devices (headquartered in Geneva, Switzerland).

Application

Possible application areas for M27C256B-70C6:
- Embedded systems firmware storage (boot code, monitor, application firmware)
- Lookup tables and fixed data (fonts, palettes, coefficients)
- Calibration and configuration data for automotive, industrial, and consumer electronics
- Prototyping and development ROMs (PROMs for early hardware demos)
- Any microcontroller/microprocessor design needing a small, non-volatile ROM with fast access.

Equivalent

Equivalent products (256 Kbit, 32K×8 EPROM, 70 ns) include:
- ST M27C256B-70C6 (your part)
- Atmel AT27C256 (70 ns)
- AMD AM27C256
- Macronix MX27C256
- Winbond W27C256
- NEC/Digi D27C256 (and derivatives)
Note: ensure same speed grade, voltage, and DIP8 pinout; exact suffixes vary by vendor.