My Inquiry
My Account
Microchip Technology AT28HC64B-70TU-T
- Part No.:
- AT28HC64B-70TU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT28HC64B-70TU-T.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,122
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT28HC64B-70TU-T from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 70 ns read access time, hardware/software data protection, and page write capability supporting up to 64 bytes per internal cycle - used in industrial control firmware storage and embedded configuration memory.
For engineers reviewing the AT28HC64B-70TU-T datasheet, AT28HC64B-70TU-T pinout, AT28HC64B-70TU-T application, or AT28HC64B-70TU-T equivalent, key selection criteria include 5 V ±10% single-supply operation, 100 µA CMOS standby current, DATA polling/toggle bit write completion detection, and industrial temperature range (–40°C to +85°C).
Technical Context
The AT28HC64B-70TU-T implements a parallel interface with static RAM-like read/write timing, eliminating external address latches. Its internal 64-byte page register enables burst loading of 1–64 bytes within 150 µs per byte, with automatic internal programming triggered after the last valid load.
Write completion is verified via dual methods: DATA polling on I/O7 (complement-to-data during write, true data on completion) and toggle-bit behavior on I/O6 (toggling until write ends). Hardware protection includes VCC sense (<3.8 V inhibits writes), 5 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), sufficient for boot code, calibration tables, or device configuration in microcontroller systems |
| Read Access Time | 70 ns maximum - supports high-speed CPU bus interfacing without wait states at ≤14 MHz |
| Page Write Cycle | 10 ms maximum - enables efficient bulk updates while minimizing system blocking time |
| Standby Current | 100 µA CMOS - critical for low-power battery-backed applications and energy-sensitive designs |
| Endurance | 100,000 write/erase cycles - ensures long-term reliability in field-updatable systems |
| Data Retention | 10 years at 85°C - validated for industrial deployments requiring decade-level nonvolatile storage integrity |
| Supply Voltage | 5 V ±10% - compatible with legacy 5 V logic families and mixed-voltage board architectures |
Pinout & Package
AT28HC64B-70TU-T is packaged in a 28-lead Thin Small Outline Package (TSOP), 8 mm × 13.4 mm body, lead pitch 0.55 mm, compliant with JEDEC MO-183. Pin 1 identifier located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus selecting one of 8,192 memory locations; A6–A12 define page boundaries for 64-byte page writes |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for toggle-bit detection during write cycles |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read; inhibits all operations when high |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high to prevent bus contention |
| WE | Write Enable | Active-low write strobe; initiates byte or page write on falling edge; combined with CE for robust write inhibition |
| VCC | Power Supply | +5 V ±10% supply; internal VCC sense disables writes below ~3.8 V to prevent corruption during brown-out |
| GND | Ground Reference | Signal and power ground reference; decoupling capacitor required near VCC pin for stable operation |
| NC | No Connect | Unbonded pins (e.g., TSOP pins 1, 14, 27, 28); must remain unconnected per design specification |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Operation | Internal 64-byte latch allows sequential loading of 1–64 bytes within 150 µs intervals - reduces host CPU overhead vs. individual byte writes |
| DATA Polling & Toggle Bit | Dual asynchronous write-completion detection (I/O7 complement, I/O6 toggle) eliminates need for fixed delays or external timers |
| Software Data Protection (SDP) | User-configurable 3-byte command sequence (AAh/55h/A0h) enables/disables write lock - prevents accidental overwrites during power transitions |
| Hardware Write Inhibit | VCC sensing, 5 ms power-on delay, and 15 ns noise filtering on WE/CE ensure immunity to supply glitches and EMI-induced false writes |
| Device Identification Area | 64-byte reserved region (1FC0h–1FFFh) accessible via 12 V on A9 - supports unique device serialization and traceability |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Memory |
|---|---|
Use Scenario: Storing runtime parameters, sensor offsets, and operational thresholds in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via parallel bus during system initialization and parameter updates; 70 ns read speed enables real-time access during scan cycles. Use Value: 100,000-cycle endurance and 10-year data retention ensure reliable operation across extended maintenance intervals without recalibration. | Use Scenario: Holding calibrated sensor coefficients and safety-critical operational limits in portable diagnostic equipment subject to frequent power cycling. IC Role / Device Role / Timing Role: Secure parameter storage with software/hardware write protection preventing unintended modification during battery swaps or firmware updates. Use Value: 100 µA standby current extends battery life; SDP and VCC-sense protection maintain data integrity during brown-out conditions. |
| Automotive Body Control Module (BCM) | Test Equipment Firmware Storage |
Use Scenario: Retaining user preferences, door lock settings, and lighting profiles in automotive BCMs operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-temperature-rated EEPROM interfaced directly to MCU's parallel bus; JEDEC pinout simplifies layout and avoids level-shifting components. Use Value: Green (Pb/Halide-free) TSOP package meets automotive RoHS requirements; page write reduces update latency during vehicle reprogramming. | Use Scenario: Storing calibration constants, test scripts, and instrument-specific firmware patches in automated test systems requiring field upgrades. IC Role / Device Role / Timing Role: Field-upgradable nonvolatile memory accessed via standard parallel interface; 64-byte page write accelerates firmware patch application. Use Value: Dual write-detection methods (polling + toggle bit) enable deterministic timing for automated test sequences without fixed delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28HC64B-70JU | Same die, 32-lead PLCC package instead of 28-lead TSOP; larger footprint, different thermal profile and mounting process | Suitable for through-hole or surface-mount PLCC sockets; less space-constrained PCBs where mechanical robustness is prioritized | Select AT28HC64B-70JU only if PLCC socketing or legacy board compatibility is required; not pin-compatible with TSOP layout |
| MN63C256F-70 | 64 Kbit parallel EEPROM with 70 ns access, but lacks software data protection and uses different page write protocol (no 150 µs tBLC constraint) | Used in cost-sensitive consumer electronics where full Atmel-level write protection is not mandated | Choose MN63C256F-70 only for non-critical applications; requires redesign of write-handling logic due to absence of SDP and differing page timing |
Compared with AT28HC64B-70JU, the AT28HC64B-70TU-T offers superior board-area efficiency and thermal performance in thin-profile designs; versus MN63C256F-70, it delivers stronger data integrity assurance via dual hardware/software write protection and deterministic page write timing.
Availability
AT28HC64B-70TU-T is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive body electronics, and automated test equipment requiring stable component supply, long-lifecycle support, and green packaging compliance.
Supply support for AT28HC64B-70TU-T 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 devices.
The AT28HC64B product line delivers high-reliability parallel EEPROMs optimized for industrial and embedded systems requiring fast read access, robust write protection, and long-term data retention without external support circuitry.
FAQ
What is the maximum page write size supported by the AT28HC64B-70TU-T?
The AT28HC64B-70TU-T supports a maximum page write size of 64 bytes per internal programming cycle. This is enabled by its internal 64-byte page register, which latches addresses and data sequentially within a 150 µs window (tBLC) between successive byte loads. The AT28HC64B-70TU-T requires A6–A12 to remain constant across all byte loads in a single page write operation to ensure correct page targeting.
Does the AT28HC64B-70TU-T require a 12 V supply for normal operation?
No, the AT28HC64B-70TU-T operates solely from a 5 V ±10% supply during standard read and write operations. A 12 V ±0.5 V voltage applied to pin A9 is required only for accessing the 64-byte device identification area (1FC0h–1FFFh); this is an optional feature and not needed for main memory operation. All other functions - including software data protection enable/disable - use only the 5 V supply.
How does hardware write protection work on the AT28HC64B-70TU-T?
The AT28HC64B-70TU-T implements four hardware write protection mechanisms: (1) VCC sense disables writes if supply drops below ~3.8 V; (2) a 5 ms internal timer prevents writes until VCC stabilizes after power-on; (3) write inhibition occurs if OE is low, CE is high, or WE is high; and (4) input noise filtering rejects pulses <15 ns on WE or CE. These features collectively prevent corruption during power transients or EMI events without software intervention.
Can the AT28HC64B-70TU-T be used in place of a standard SRAM in a microcontroller interface?
Yes, the AT28HC64B-70TU-T is designed for SRAM-compatible read/write timing - it behaves like a static RAM during reads and accepts byte/page writes without external latches or timing glue logic. However, write cycles take up to 10 ms (vs. nanosecond SRAM writes), so the host must use DATA polling or toggle-bit detection to determine completion before initiating subsequent accesses. This makes it suitable for configuration storage but not for volatile working memory.
What is the purpose of the extra 64 bytes of EEPROM in the AT28HC64B-70TU-T?
The AT28HC64B-70TU-T includes an additional 64-byte EEPROM segment (addresses 1FC0h–1FFFh) dedicated to device identification and tracking. It is accessed by applying 12 V ±0.5 V to pin A9 while using standard read/write protocols. This area supports unique serialization, manufacturing traceability, or calibration metadata storage - separate from the main 64 Kbit array and protected by the same hardware/software write safeguards.
AT28HC64B-70TU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 10ms
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT28HC64B-70TU-T FAQ
1.How can I place an order for AT28HC64B-70TU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28HC64B-70TU-T 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 AT28HC64B-70TU-T reliable?
The price and inventory of AT28HC64B-70TU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28HC64B-70TU-T is usually 5 days.
3.What payment methods are accepted for AT28HC64B-70TU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28HC64B-70TU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28HC64B-70TU-T?
AT28HC64B-70TU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28HC64B-70TU-T 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 AT28HC64B-70TU-T?
For technical support, including AT28HC64B-70TU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28HC64B-70TU-T requirements.
6.How does Aetrix verify that AT28HC64B-70TU-T is sourced from the original manufacturer or authorized distributors?
All AT28HC64B-70TU-T 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 AT28HC64B-70TU-T meets industry standards.
7.What is the process for return or replacement of AT28HC64B-70TU-T?
All AT28HC64B-70TU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT28HC64B-70TU-T, 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 AT28HC64B-70TU-T part is unused and in its original packaging.
Return procedure for AT28HC64B-70TU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28HC64B-70TU-T 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…
