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Microchip Technology AT28C64-15TC
- Part No.:
- AT28C64-15TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT28C64-15TC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,997
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Product details
Overview
AT28C64-15TC from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 150 ns read access time, 1 ms fast byte write cycle, and CMOS/TTL-compatible I/O for direct microprocessor interfacing in embedded control systems.
For engineers reviewing the AT28C64-15TC datasheet, AT28C64-15TC pinout, AT28C64-15TC application, or AT28C64-15TC equivalent, this device serves as a nonvolatile memory replacement for SRAM-based boot code storage, configuration retention, and firmware parameter logging in industrial controllers and legacy ISA-bus peripherals.
Technical Context
The AT28C64-15TC operates as a drop-in parallel memory with static RAM-like read/write timing-CE and OE jointly enable output drivers while WE initiates self-timed byte programming. Its internal latches free the address/data bus during writes, and RDY/BUSY or DATA polling (I/O7 complement) signals completion without external timing logic.
It uses Atmel's proprietary nonvolatile technology with on-chip error correction, supports 10⁴ write cycles, retains data for 10 years at 85°C, and includes VCC-sense write protection, chip clear (12 V on OE), and 32-byte user ID area (1FE0H–1FFFH).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits); sufficient for boot loader code or device configuration tables in 8-bit microcontroller systems. |
| Read Access Time | 150 ns max; compatible with 5–6 MHz Z80/8086/68000 bus timing without wait states. |
| Byte Write Time | 1 ms typical; self-timed with internal control timer-no external write pulse generation required. |
| VCC Supply | 5 V ±10%; eliminates need for dedicated programming voltage in normal operation. |
| Standby Current | 100 µA (CMOS); enables low-power retention in battery-backed industrial modules. |
| Endurance | 10,000 write/erase cycles; validated for field-updatable calibration data in test equipment. |
| Operating Temp | 0°C to +70°C (Commercial); suitable for office automation, POS terminals, and PC add-in cards. |
Pinout & Package
AT28C64-15TC is housed in a 28-lead Plastic Thin Small Outline Package (TSOP), JEDEC MS-012 compliant, with 300-mil body width and gull-wing leads. Pin 1 is RDY/BUSY (open-drain), active-low during write cycles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus for 8K-word addressing; TTL/CMOS compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; supports DATA polling via I/O7 complement during write completion detection. |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state to prevent bus contention. |
| OE | Output Enable | Active-low read strobe; dual-line control with CE allows flexible bus arbitration in multi-device systems. |
| WE | Write Enable | Active-low write strobe; initiates self-timed byte write with internal latch and auto-clear sequence. |
| RDY/BUSY | Ready/Busy Output | Open-drain signal pulled low during write; supports wired-OR connection of multiple devices on shared status line. |
| VCC, GND | Power Supply | Single 5 V supply; 30 mA active current enables use with standard 5 V regulator rails in legacy designs. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Byte Write | Eliminates external timing circuitry-internal control timer manages erase-before-write and completion signaling. |
| DATA Polling Support | Enables software-driven write completion detection using I/O7 complement, avoiding hardware interrupt dependency. |
| JEDEC Byte-wide Pinout | Ensures compatibility with existing 2764/27128 socket layouts and memory controller logic in industrial backplanes. |
| VCC Sense Write Protection | Prevents inadvertent writes below 3.8 V, critical for reliable operation during power-up/down transitions. |
| User ID Area | 32 bytes at 1FE0H–1FFFH allow unique device serialization or firmware version tagging without consuming main array space. |
Applications
| Industrial PLC Configuration Storage | Legacy PC BIOS Parameter Retention |
|---|---|
|
Use Scenario: Storing I/O mapping, PID tuning constants, and alarm thresholds in programmable logic controllers with no battery backup. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via 8-bit parallel bus during system initialization and runtime updates. Use Value: 10-year data retention at 70°C ensures parameter integrity across maintenance cycles without capacitor-based backup. |
Use Scenario: Holding CMOS setup values (date/time, drive geometry, boot order) in ISA-bus motherboards where NVRAM is not integrated. IC Role / Device Role / Timing Role: Standalone parallel EEPROM replacing DS12887-style real-time clock/NVRAM combos in cost-sensitive designs. Use Value: 150 ns read access meets ISA bus timing without wait-state insertion, preserving system performance. |
| Test Equipment Calibration Data | Embedded Instrumentation Firmware Patching |
|
Use Scenario: Recording factory calibration coefficients and user-adjusted offsets in multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Field-updatable parameter store accessed by microcontroller during self-test and measurement routines. Use Value: 10⁴ endurance rating supports >100 recalibrations over product lifetime without wear-out concerns. |
Use Scenario: Hosting minor firmware patches or feature unlocks in medical analyzers where full flash reprogramming is prohibited. IC Role / Device Role / Timing Role: Secondary code storage mapped into CPU address space alongside primary ROM, updated via serial command interface. Use Value: Chip Clear (12 V on OE) enables secure erasure of patch data before device decommissioning or reuse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-15TC | Revised revision with improved data retention (10 years @ 85°C vs. original 10 years @ 70°C) and tighter tACC tolerance (150 ns guaranteed vs. 150 ns max). | Preferred for new designs targeting extended temperature operation or higher reliability certification (e.g., IEC 60601-1). | Select AT28C64B-15TC if long-term data integrity at elevated ambient temperatures is required. |
| MX28F640KC-15T | Intel-compatible 64 Kbit parallel EEPROM with identical 28-pin TSOP package but requires 12 V VPP for programming and lacks RDY/BUSY pin. | Suitable only where existing board layout supports VPP routing and software can implement polling-only completion detection. | Choose MX28F640KC-15T only when migrating from Intel 28F-series designs and VPP infrastructure exists. |
Compared with AT28C64-15TC, AT28C64B-15TC offers enhanced thermal data retention without layout changes, while MX28F640KC-15T demands VPP support and sacrifices hardware-ready signaling-making AT28C64-15TC optimal for cost-sensitive, single-supply 5 V systems requiring robust status feedback.
Availability
AT28C64-15TC is available at Aetrix Electronics and suitable for industrial PLCs, legacy PC BIOS modules, and test equipment calibration storage requiring stable component supply and long-lifecycle support.
Supply support for AT28C64-15TC 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 manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT28C64 series was designed as a pin-compatible, low-power upgrade path from UV-erasable EPROMs and battery-backed SRAMs for embedded systems requiring field-programmable nonvolatile storage.
FAQ
What is the maximum operating temperature range for the AT28C64-15TC?
The AT28C64-15TC is rated for commercial temperature operation from 0°C to +70°C. It is not specified for industrial (-40°C to +85°C) use-those variants carry suffixes like "TI" or "JI". This makes the AT28C64-15TC appropriate for office, lab, and consumer-grade equipment where ambient conditions remain within that range. The AT28C64-15TC datasheet confirms this range in its DC and AC Operating Range table.
Does the AT28C64-15TC require a 12 V programming voltage during normal operation?
No, the AT28C64-15TC operates entirely from a single 5 V ±10% supply during reads and standard byte writes. A 12 V pulse on OE is required only for the optional CHIP CLEAR function-not for routine programming. All other operations, including DATA polling and RDY/BUSY signaling, function at 5 V. This simplifies power design compared to older EPROMs and eliminates need for charge pumps or external VPP generators in the AT28C64-15TC application.
How does the AT28C64-15TC handle write completion detection?
The AT28C64-15TC provides two hardware-supported methods: an open-drain RDY/BUSY pin (pin 1) that pulls low during write cycles and releases upon completion, and DATA polling via I/O7-where reading the target location returns the complement of written data until the write finishes. Both mechanisms are fully documented in the AT28C64-15TC datasheet's Device Operation section and require no external components.
Is the AT28C64-15TC pin-compatible with the AT28C64-15PC (PDIP package)?
Yes-the AT28C64-15TC (TSOP) and AT28C64-15PC (PDIP) share identical pin functions and JEDEC-standard byte-wide pinout, differing only in physical package and lead form. Signal assignments for A0–A12, I/O0–I/O7, CE, OE, WE, RDY/BUSY, VCC, and GND match exactly. This allows direct PCB footprint substitution between packages when mechanical constraints permit, preserving full AT28C64-15TC functional equivalence.
What is the endurance rating of the AT28C64-15TC, and how is it verified?
The AT28C64-15TC guarantees 10,000 write/erase cycles per memory location, as confirmed in the Features section and DC Characteristics table of its official datasheet. This endurance is achieved through Atmel's nonvolatile process with internal error correction and is validated across process corners and temperature extremes-not derived from accelerated testing extrapolation. Applications involving infrequent updates (e.g., once-per-shift calibration) will far exceed this limit in real-world AT28C64-15TC deployment.
AT28C64-15TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT28C64-15TC FAQ
1.How can I place an order for AT28C64-15TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64-15TC 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 AT28C64-15TC reliable?
The price and inventory of AT28C64-15TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64-15TC is usually 5 days.
3.What payment methods are accepted for AT28C64-15TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64-15TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64-15TC?
AT28C64-15TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64-15TC 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 AT28C64-15TC?
For technical support, including AT28C64-15TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64-15TC requirements.
6.How does Aetrix verify that AT28C64-15TC is sourced from the original manufacturer or authorized distributors?
All AT28C64-15TC 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 AT28C64-15TC meets industry standards.
7.What is the process for return or replacement of AT28C64-15TC?
All AT28C64-15TC units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64-15TC, 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 AT28C64-15TC part is unused and in its original packaging.
Return procedure for AT28C64-15TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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