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Microchip Technology AT28C16-15JI
- Part No.:
- AT28C16-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT28C16-15JI.pdf
- Description:
- IC EEPROM 16KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT28C16-15JI from Atmel is a 16 Kbit (2,048 × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 150 ns read access time, 200 µs fast byte write (E-version), and industrial temperature range (–40°C to +85°C). It operates on 5V ±10%, supports DATA POLLING for write completion detection, and integrates internal address/data latches and self-timed write control - used in firmware storage and configuration retention for embedded controllers.
For engineers reviewing the AT28C16-15JI datasheet, AT28C16-15JI pinout, AT28C16-15JI application, or AT28C16-15JI equivalent, key selection criteria include its 150 ns read timing, 200 µs/1 ms write options, CMOS/TTL I/O compatibility, JEDEC-compliant 32-pin PLCC package, and industrial-grade reliability with 10⁴–10⁵ endurance cycles and 10-year data retention.
Technical Context
The AT28C16-15JI implements a self-timed byte write architecture with internal control timer and automatic clear-before-write logic, eliminating external timing components. Its dual-line chip enable (CE) and output enable (OE) control enables flexible bus arbitration and prevents contention during mixed read/write operations.
It uses Atmel's nonvolatile CMOS process with built-in error correction for enhanced endurance and retention. The device includes dedicated 12 V programming support for CHIP CLEAR and DEVICE IDENTIFICATION via A9 high-voltage mode, accessing 32 extra bytes at addresses 7E0H–7FFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16 Kbit (2,048 words × 8 bits) - sufficient for boot code, calibration tables, or small firmware images in microcontroller systems. |
| Read Access Time | 150 ns - compatible with 5–6 MHz Z80, 8051, and 68K-based systems without wait states. |
| Byte Write Time | 200 µs (E-version) - enables full memory rewrite in ≤0.4 s; standard version requires up to 1 ms per byte. |
| Supply Voltage | 5V ±10% - matches legacy TTL/CMOS logic rails; VCC sense inhibits writes below 3.8 V for power-fail safety. |
| Endurance & Retention | 10⁴–10⁵ write cycles / 10 years data retention - validated for field-deployed industrial controllers requiring infrequent but reliable updates. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives, PLC modules, and instrumentation. |
| Standby Current | 100 µA (CMOS) - enables low-power operation in battery-backed or energy-constrained subsystems. |
Pinout & Package
AT28C16-15JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-018 AA compliant, with lead pitch of 1.27 mm and body size 13.9 × 13.9 mm. Pin 1 is marked by corner notch; pins 1 and 17 are designated "DON'T CONNECT" per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit address bus supporting full 2K-word addressing; A10 enables access to upper half of memory space. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8-bit microprocessor data buses; supports true read/write without direction control lines. |
| CE | Chip Enable | Active-low global enable; when high, places device in standby (100 µA) and forces outputs to high-Z regardless of OE/WE state. |
| OE | Output Enable | Active-low read control; used with CE to manage bus contention; supports DATA POLLING by reading I/O7 during write cycles. |
| WE | Write Enable | Active-low write strobe; initiates self-timed byte write; latches address/data on falling/rising edges respectively. |
| GND / VCC | Power Terminals | Single 5V supply; decoupling required near VCC/GND pins due to 30 mA active current and fast switching transients. |
| NC / DC | No Connect / Don't Connect | Pins 1 and 17 are unconnected; must remain floating - no pull-up/down or routing allowed per manufacturer specification. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed byte write cycle | Eliminates need for external write pulse generators or timing logic; frees CPU bus after address/data latch for concurrent tasks. |
| DATA POLLING on I/O7 | Enables software-driven write completion detection without polling delay loops or hardware interrupts - reduces firmware overhead. |
| 12 V-programmable CHIP CLEAR | Allows full memory erase via 10 ms WE pulse with OE = 12 V; avoids UV erasers or specialized programmers in field maintenance. |
| Dedicated 32-byte ID area | Provides user-writable space at 7E0H–7FFH for serial numbers, calibration offsets, or revision tracking - accessible using same A9=12 V protocol. |
| VCC sense & power-on delay | Prevents inadvertent writes during power ramp-up by disabling WE until VCC ≥3.8 V and enforcing 5 ms lockout - improves system robustness. |
Applications
| Industrial PLC Configuration Storage | Legacy Microcontroller Bootloader Memory |
|---|---|
|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during startup and runtime reconfiguration; reads occur at system initialization, writes only during parameter update. Use Value: 10⁵ endurance cycles and 10-year retention ensure >10 years of field operation without degradation; 150 ns read time supports deterministic scan-cycle timing in real-time control loops. |
Use Scenario: Holding bootloader firmware and secure boot keys in 8-bit microcontrollers (e.g., 8051, Z8) where external ROM is required for safe firmware recovery. IC Role / Device Role / Timing Role: Parallel boot memory mapped into CPU address space; executed directly or copied to RAM; write-protected during normal operation. Use Value: JEDEC pinout ensures drop-in compatibility with existing SRAM/ROM sockets; 5V operation and TTL/CMOS I/O simplify interface design without level shifters. |
| Medical Device Calibration Data | Telecom Line Card Identity & Settings |
|
Use Scenario: Storing sensor calibration coefficients, patient-specific settings, and regulatory compliance logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile storage accessed only during calibration routines or service mode; write-protected by VCC sense and OE/CE/WE logic. Use Value: 12 V CHIP CLEAR enables authorized recalibration in service centers; 32-byte ID area stores unique device identifiers traceable to manufacturing lot and calibration date. |
Use Scenario: Maintaining board identification, firmware version, port configuration, and optical power thresholds in telecom line cards operating in NEBS-compliant cabinets. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to management MCU via parallel bus; updated during card insertion or remote provisioning. Use Value: Industrial temperature rating (–40°C to +85°C) guarantees operation across wide ambient ranges; 200 µs fast write minimizes service interruption during field upgrades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-15JI | 32× larger capacity (32 K × 8), same 150 ns access, identical PLCC-32 package and pinout - pin-compatible upgrade path. | Supports larger boot images or multi-region configuration storage; requires no PCB change if footprint matches. | Select when future firmware growth or additional parameter sets demand >16 Kbit without redesigning the memory interface. |
| MX28F1600CZI-15 | 16 K × 8 flash memory (not EEPROM); 150 ns read, but sector erase required before write; no DATA POLLING - uses status register polling instead. | Lower cost per bit but less flexible for single-byte updates; requires erase management firmware and higher voltage (12 V) for erase. | Choose for cost-sensitive, write-rare applications where full-sector updates are acceptable and erase latency is tolerable. |
Compared with AT28C16-15JI, AT28C256-15JI offers scalable capacity within the same socket, while MX28F1600CZI-15 trades byte-level write flexibility for lower unit cost and flash density - making the former ideal for forward-compatible designs and the latter suitable for static configuration storage with infrequent updates.
Availability
AT28C16-15JI is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller boot systems, medical calibration modules, and telecom line card configuration requiring stable component supply across extended product lifecycles.
Supply support for AT28C16-15JI 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 semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT28C16-15JI belongs to Atmel's parallel EEPROM product line designed for reliable, low-power, byte-alterable nonvolatile storage in resource-constrained embedded systems requiring direct CPU bus interfacing and long-term data integrity.
FAQ
What is the difference between AT28C16-15JI and AT28C16-15JC?
The AT28C16-15JI and AT28C16-15JC share identical electrical specifications and pinout but differ in temperature rating: AT28C16-15JI is rated for –40°C to +85°C (industrial), while AT28C16-15JC is rated for 0°C to +70°C (commercial). Both use the same 32-lead PLCC package and support 150 ns read access and 200 µs fast byte write. The AT28C16-15JI is selected for harsher thermal environments such as factory floors or outdoor telecom enclosures.
Does AT28C16-15JI support true byte-level writes without erasing prior data?
Yes, the AT28C16-15JI performs true byte-level writes without requiring sector or chip erase. Its self-timed write cycle includes automatic clear-before-write logic, ensuring each addressed byte is reliably overwritten in a single operation. This behavior is confirmed in the datasheet's "BYTE WRITE" section and distinguishes it from flash memories that mandate erase-before-write sequences.
How is write completion detected for AT28C16-15JI?
Write completion for AT28C16-15JI is detected via DATA POLLING on I/O7: during an active write, reading the target address returns the complement of the written data on I/O7 (other bits are indeterminate); once the write finishes, true data appears on all I/O lines. This method eliminates the need for fixed delays or external status signals and is fully supported in the AT28C16-15JI's timing specifications.
Can AT28C16-15JI be used as a direct replacement for SRAM in existing designs?
The AT28C16-15JI can replace SRAM in read-dominant applications but is not a functional drop-in substitute for write-intensive SRAM usage. While it shares identical JEDEC byte-wide pinout and 5V TTL/CMOS compatibility, its write latency (200 µs–1 ms) and endurance limit (10⁴–10⁵ cycles) make it unsuitable for frequent random writes. It is appropriate for configuration storage where writes occur only during setup or updates - not for general-purpose RAM emulation.
What packaging and marking details apply to AT28C16-15JI?
The AT28C16-15JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-018 AA, with "AT28C16-15JI" laser-marked on the top surface. Pins 1 and 17 are explicitly designated "DON'T CONNECT" and must remain unconnected. The industrial temperature grade is indicated by the "I" suffix, and the "15" denotes 150 ns access time - both encoded in the full part number AT28C16-15JI.
AT28C16-15JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 1ms
- Access Time:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT28C16-15JI FAQ
1.How can I place an order for AT28C16-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C16-15JI 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 AT28C16-15JI reliable?
The price and inventory of AT28C16-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C16-15JI is usually 5 days.
3.What payment methods are accepted for AT28C16-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C16-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C16-15JI?
AT28C16-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C16-15JI 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 AT28C16-15JI?
For technical support, including AT28C16-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C16-15JI requirements.
6.How does Aetrix verify that AT28C16-15JI is sourced from the original manufacturer or authorized distributors?
All AT28C16-15JI 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 AT28C16-15JI meets industry standards.
7.What is the process for return or replacement of AT28C16-15JI?
All AT28C16-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT28C16-15JI, 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 AT28C16-15JI part is unused and in its original packaging.
Return procedure for AT28C16-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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