My Inquiry
My Account
Microchip Technology AT27C1024-70PI
- Part No.:
- AT27C1024-70PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-70PI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,699
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C1024-70PI from Microchip Technology (formerly Atmel) is a 1-Mbit one-time programmable EPROM organized as 64K × 16 bits, operating at 5V ±10%, with 70 ns maximum read access time and industrial temperature range (–40°C to +85°C). It uses PDIP-40 packaging, features dual-line control (CE/OE), and serves as firmware storage in legacy microprocessor systems requiring non-volatile, pin-compatible ROM replacement.
For engineers reviewing the AT27C1024-70PI datasheet, AT27C1024-70PI pinout, AT27C1024-70PI application, or AT27C1024-70PI equivalent, this page delivers verified electrical specs, validated PDIP-40 pin mapping, confirmed OTP programming behavior, JEDEC-compliant timing modes, and real-world use cases in embedded boot memory and industrial controller firmware storage.
Technical Context
The AT27C1024-70PI implements a CMOS-based OTP EPROM architecture with address decoding for A0–A15, 16-bit bidirectional data outputs (O0–O15), and dedicated programming control via PGM and VPP (12.0 V ±0.5 V during programming). Its two-line enable scheme (CE active-low, OE active-low) eliminates bus contention in high-speed 16-bit bus systems.
It supports Rapid™ programming with 100 µs/word typical pulse width, integrated product identification (Manufacturer ID: 001Eh, Device ID: 00F1h), and operates in five distinct modes: Read, Output Disable, Standby, Rapid Program, and Product Identification - all defined by specific CE/OE/PGM voltage combinations and VPP state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling full 16-bit word access without byte splitting |
| Read Access Time | 70 ns max (tACC), eliminating WAIT states in 14 MHz CPU interfaces |
| Supply Voltage | 5 V ±10%, compatible with standard TTL/CMOS logic rails without regulation |
| Operating Temperature | –40°C to +85°C, qualified for industrial control and factory automation environments |
| Programming Voltage | VPP = 12.0 V ±0.5 V, requiring external high-voltage supply during one-time programming only |
| Standby Current | 100 µA max (ISB1), reducing system power in idle states without external gating |
| Active Current | 30 mA max at 5 MHz, supporting sustained burst reads in real-time firmware execution |
Pinout & Package
AT27C1024-70PI is supplied in a 40-lead, 0.600" wide plastic dual in-line package (PDIP-40), JEDEC MS-011 AC compliant, with 0.100" lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–10, 19–20, 22–40 | A0–A15, O0–O15, CE, OE, PGM, VPP, VCC, GND, NC | Standardized JEDEC PDIP-40 pinout per datasheet Rev. 0019J–07/98; both GND pins (11 & 22) must be connected for EMI and current return integrity |
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on CE low for memory location selection |
| O0–O15 | Data Outputs | True 16-bit parallel output bus; high-impedance when CE or OE high |
| CE | Chip Enable | Primary device select; enables internal circuitry and address decoding when low |
| OE | Output Enable | Gates output drivers; allows shared bus operation with other devices when high |
| PGM | Program Strobe | Active-low pulse input that triggers 100 µs programming cycle when VPP = 12 V |
| VPP | Programming Supply | 12 V input required only during programming; must be applied after and removed before VCC |
| VCC | Power Supply | 5 V main supply; powers read and standby modes; supplies internal logic and drivers |
| GND (Pins 11 & 22) | Ground Reference | Dual ground pins reduce ground bounce and improve noise immunity in high-speed reads |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time with auto-verify loop, reducing production burn-in duration |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device ID (00F1h) readable via A0/A9 toggle, enabling automated programmer validation |
| Two-Line Control Architecture | Independent CE and OE inputs allow flexible bus arbitration and eliminate contention in multi-device systems |
| JEDEC-Compliant Packaging | Available in PDIP-40, PLCC-44, and VSOP-40 footprints - AT27C1024-70PI uses PDIP-40 for legacy board compatibility |
| ESD & Latchup Robustness | 2000 V HBM ESD rating and 200 mA latchup immunity ensure reliability in manual handling and industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy 16-Bit Microprocessor Boot ROM |
|---|---|
Use Scenario: Fixed firmware image stored in programmable ROM for programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 70 ns read access to initialization code during cold start. Use Value: Eliminates reliance on external EEPROM or flash; ensures bit-perfect firmware retention over 20+ years without refresh cycles. |
Use Scenario: Bootloader storage for Motorola 68000 or Intel 80286-based embedded systems where ROM space and timing predictability are critical. IC Role / Device Role / Timing Role: Primary instruction ROM mapped into upper memory space, accessed via 16-bit data bus with no wait-state insertion. Use Value: Enables direct execution from ROM (XIP) with guaranteed tACC ≤ 70 ns, simplifying timing budgeting in synchronous bus designs. |
| Military Avionics Configuration Memory | Test Equipment Calibration Data Storage |
Use Scenario: Storing immutable hardware configuration tables and safety-critical flight control parameters in airborne systems certified to DO-254. IC Role / Device Role / Timing Role: OTP EPROM used for tamper-resistant, radiation-tolerant parameter storage; programmed once during final test. Use Value: Provides permanent, unalterable data retention without battery backup or wear-leveling overhead - meeting MIL-STD-883 Class B requirements. |
Use Scenario: Holding factory-calibrated ADC/DAC coefficients and sensor linearization tables in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Read-only lookup table accessed during instrument self-test and measurement correction routines. Use Value: Guarantees coefficient stability across temperature and time; avoids recalibration drift associated with volatile or reprogrammable media. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-70JI | Same die, identical 70 ns speed grade and 64K×16 organization, but packaged in PLCC-44 instead of PDIP-40 | Requires PCB redesign for surface-mount assembly; lacks through-hole mounting and socket compatibility | Select only when upgrading to surface-mount layout and needing same timing/performance in compact footprint |
| AM27C1024-70DC | AMD second-source part; matches AC/DC specs and pinout, but lacks Integrated Product ID Code and Rapid™ programming verification sequence | Compatible in read mode; requires modified programming algorithm and verification flow in production | Choose for cost-sensitive volume builds where ID code and auto-verify are not required in manufacturing test |
Compared with AT27C1024-70PI, the AT27C1024-70JI offers identical functionality in PLCC-44 for SMT layouts, while AM27C1024-70DC provides pin-compatible read operation but omits programmable ID and rapid verify - making AT27C1024-70PI optimal for legacy through-hole systems requiring full Atmel feature set.
Availability
AT27C1024-70PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy 16-bit microprocessor boot ROM, and military avionics configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C1024-70PI 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel memory products, including documentation, programming tools, and long-term supply assurance.
The AT27C1024 product line was designed for high-reliability, non-volatile firmware storage in industrial, automotive, and aerospace systems where data immutability, timing predictability, and JEDEC-standard compatibility are mandatory.
FAQ
What is the correct power-up sequencing for AT27C1024-70PI?
VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP. Violating this sequence risks exceeding absolute maximum ratings on A9 or VPP pins. During normal read operation, VPP is tied to VCC; only during programming is VPP raised to 12.0 V ±0.5 V. The AT27C1024-70PI datasheet specifies this requirement in Section "System Considerations" and "Absolute Maximum Ratings".
Does AT27C1024-70PI support byte-wide access, or is it strictly 16-bit?
The AT27C1024-70PI is strictly organized as 64K × 16 bits - it has no byte-enable or upper/lower word select pins. All 16 outputs (O0–O15) are driven simultaneously on each read cycle. Systems requiring byte access must implement external logic or use the full 16-bit bus width; no internal byte masking is supported in the AT27C1024-70PI.
Can AT27C1024-70PI be reprogrammed after initial programming?
No - AT27C1024-70PI is a one-time programmable (OTP) EPROM. Once a memory cell is programmed (fused), it cannot be erased or rewritten. The "Rapid™ Programming Algorithm" refers to efficient single-pass programming with verification, not reprogrammability. AT27C1024-70PI is intended for final firmware images only.
What decoupling capacitors are required for stable AT27C1024-70PI operation?
Per the AT27C1024-70PI datasheet, a 0.1 µF ceramic capacitor must be placed between VCC and GND, as close as possible to the device. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values prevent transient excursions during CE transitions and ensure stable read timing.
How is the Manufacturer and Device ID read from AT27C1024-70PI?
The AT27C1024-70PI supports electronic identification: hold A1–A15 low, apply VID = 12.0 V ±0.5 V to A9, then toggle A0 - low selects Manufacturer ID (001Eh), high selects Device ID (00F1h). This function operates in Read mode with CE and OE low, and is used by programmers to auto-detect part identity before programming the AT27C1024-70PI.
AT27C1024-70PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-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:
- 64K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C1024-70PI FAQ
1.How can I place an order for AT27C1024-70PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-70PI 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 AT27C1024-70PI reliable?
The price and inventory of AT27C1024-70PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-70PI is usually 5 days.
3.What payment methods are accepted for AT27C1024-70PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-70PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-70PI?
AT27C1024-70PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-70PI 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 AT27C1024-70PI?
For technical support, including AT27C1024-70PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-70PI requirements.
6.How does Aetrix verify that AT27C1024-70PI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-70PI 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 AT27C1024-70PI meets industry standards.
7.What is the process for return or replacement of AT27C1024-70PI?
All AT27C1024-70PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-70PI, 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 AT27C1024-70PI part is unused and in its original packaging.
Return procedure for AT27C1024-70PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C1024-70PI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
