Microchip Technology AT27C010L-90PC

Overview

AT27C010L-90PC from Atmel is a 1-Mbit (128K × 8) one-time programmable EPROM optimized for low-power embedded firmware storage. It delivers 45 ns read access time, operates from a single 5V ±10% supply, and draws only 25 mA active current at 5 MHz and ≤100 µA standby current. It is used in microprocessor-based systems requiring nonvolatile program code retention without battery backup.

For engineers reviewing the AT27C010L-90PC datasheet, AT27C010L-90PC pinout, AT27C010L-90PC application, or AT27C010L-90PC equivalent, key selection criteria include its 45 ns access speed, 25 mA active supply current, industrial temperature range (–40°C to +85°C), JEDEC-standard 32-lead PDIP package, and Rapid™ programming algorithm (100 µs/byte).

Technical Context

The AT27C010L-90PC implements a CMOS OTP EPROM architecture with dual-line control (CE and OE) to prevent bus contention during read cycles. Its address decoding supports full 17-bit addressing (A0–A16) for 128K-byte capacity, and outputs (O0–O7) are TTL/CMOS compatible with VOH ≥2.4 V and VOL ≤0.4 V under load.

It features integrated product identification via A9/VH and A0 toggling, enabling automated programming equipment recognition. Programming requires VPP = 13.0 V and VCC = 6.5 V, with a verified 100 µs PGM pulse width and up to 10 reprogramming attempts per byte.

Key Specifications

Pinout & Package

AT27C010L-90PC is supplied in a 32-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-016 compliant, with 0.100" lead pitch and through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar OTP EPROM applications.

Compared with AT27C010-90PC and MX27C1000PC-45, the AT27C010L-90PC offers lower active power and built-in identification-critical for automated manufacturing and thermal-limited deployments-while maintaining identical timing, pinout, and firmware compatibility.

Availability

AT27C010L-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control modules, and legacy microcontroller upgrade projects requiring stable component supply and long-term obsolescence management.

Supply support for AT27C010L-90PC 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

Atmel Corporation (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.

The AT27C010(L) series was designed as a low-power, high-reliability OTP EPROM family targeting firmware storage in industrial, automotive, and legacy computing systems where code immutability and long-term data retention are essential.

FAQ

What is the maximum read access time specified for the AT27C010L-90PC?

The AT27C010L-90PC has a maximum read access time of 45 ns under standard conditions (VCC = 5 V ±10%, TA = –40°C to +85°C). This value is guaranteed across the full industrial temperature range and enables direct interfacing with 5 MHz microprocessors without wait-state insertion. The "-90" suffix denotes the 90 ns speed grade variant, but the "L" low-power version maintains the faster 45 ns access specification as confirmed in the AT27C010L Ordering Information table.

Does the AT27C010L-90PC require a programming voltage other than VCC?

Yes, the AT27C010L-90PC requires VPP = 13.0 V ±0.25 V during programming, applied to the dedicated VPP pin. VCC must be raised to 6.5 V simultaneously. During normal read operation, only 5 V is needed. The device includes internal circuitry to isolate VPP from the core array except during programming, and the datasheet mandates strict sequencing: VCC must be applied before and removed after VPP to prevent damage.

Can the AT27C010L-90PC be used as a direct replacement for the AT27C010-90PC?

Yes, the AT27C010L-90PC is pin-, package-, and functionally compatible with the AT27C010-90PC, sharing identical pinout, AC/DC timing, and programming protocol. The primary difference is reduced active current (25 mA vs. 35 mA at 5 MHz), making the "L" version preferable for thermally sensitive or power-constrained designs. No PCB or firmware changes are required for substitution.

What decoupling capacitance is required for stable operation of the AT27C010L-90PC?

The AT27C010L-90PC requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close as possible to the device pins. For boards with multiple EPROMs, a bulk 4.7 µF electrolytic capacitor is also recommended near the power entry point. These values are specified in the "System Considerations" section to suppress transient excursions caused by CE switching and ensure reliable read/write margins.

How is the manufacturer and device identification code accessed on the AT27C010L-90PC?

The AT27C010L-90PC provides an Integrated Product Identification Code accessible by setting A9 = 12.0 V (VH) and toggling A0 between low and high while holding all other address lines low. Reading the O7–O0 bus yields 0x1E for Atmel's manufacturer ID and 0x05 for the AT27C010 device code. This feature is used by industry-standard programmers to auto-select correct algorithms and verify part authenticity before programming.