AT28C17-15PC - 16Kbit Parallel EEPROM, 150 ns, 28-PDIP | Microchip
Артикул: AT28C17-15PC ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $6.2 | $6,20 |
| 10 | $5.55 | $55,50 |
| 100 | $4.9 | $490,00 |
| 500 | $4.4 | $2.200,00 |
| 1.000 | $3.95 | $3.950,00 |
AT28C17-15PC Обзор
What is a parallel EEPROM? A parallel EEPROM is a non-volatile memory device that provides byte-wide data access (typically 8 bits per read/write cycle) over a parallel bus, as opposed to serial EEPROMs (I2C/SPI/Microwire) that move data one bit at a time. Parallel EEPROMs sit in the system hierarchy as: parallel EEPROM -> non-volatile memory (NVM) -> memory IC -> integrated circuit -> semiconductor. They were widely adopted in 8-bit and 16-bit microprocessor systems before flash memory densities made serial interfaces practical for all but the smallest data sets.
Key features include fast read access (150 ns), self-timed byte write cycle of 1 ms typical, internal address and data latches, an internal control timer, automatic clear-before-write, direct microprocessor control, DATA POLLING, and a READY/BUSY handshake output. The device is manufactured on Atmel's reliable nonvolatile CMOS process and supports byte-write operations without external erase cycles, simplifying firmware routines on legacy MCU platforms.
From an architectural standpoint, the AT28C17 integrates charge-pump-based high-voltage generation on-chip for the floating-gate cells, eliminating the need for an external VPP programming supply. An internal control timer sequences the write cycle automatically, freeing the host CPU to perform other tasks. WRITE PROTECT (pin WP) hard-disables writes to the upper half of the array, and DATA POLLING on I/O7 lets software detect end-of-write without continuous polling of the BUSY signal.
Typical applications include microcontroller-based configuration parameter storage, industrial control firmware scratchpad, point-of-sale terminal non-volatile data logs, legacy 8085/Z80/8051 system memory expansion, and instrumentation calibration tables. The 28-PDIP through-hole package makes the part especially useful for prototype boards, repair replacements for vintage equipment, and educational lab environments where socketed parts are preferred.
When designing with this device, observe the 4.5 V minimum supply for reliable byte-write operation and provide proper decoupling (typically 0.1 uF) close to VCC. The READY/BUSY open-drain output requires a pull-up resistor to VCC if used with a wired-OR connection to interrupt logic or other status lines.
This page synthesizes distributor pricing, parallel-EEPROM drop-in alternatives (AT28C16 family, M28C16, X28C16), and practical design notes not found in a single place on the manufacturer datasheet.
Аналоги без доработки для AT28C17-15PC — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
AT28C17-15PU
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AT28C17-20PC
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AT28C16-15PC
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
M28C17-15
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
X28C16P-25
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AT28C17-15PC Максимальные параметры и электрические характеристики
| Тип памяти | EEPROM (Electrically Erasable and Programmable ROM), non-volatile |
| Размер памяти | 16 Kbit (2,048 bytes) |
| Организация памяти | 2,048 words x 8 bits (2K x 8) |
| Интерфейс | Parallel |
| Read Access Time | 150 ns (max) |
| Byte Write Cycle Time | 1 ms (typical, self-timed) |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Диапазон рабочих температур | 0 C to +70 C (commercial grade) |
| Корпус | 28-PDIP (Plastic DIP, through-hole, JESD-30 R-PDIP-T28) |
| Число выводов | 28 |
| Write Protection | Hardware WP pin protects upper 4Kbit array |
| End-of-Write Indication | DATA POLLING on I/O7 and open-drain READY/BUSY |
| Тип монтажа | Through-Hole (THT) |
| Уровень MSL | Not Applicable (through-hole device) |
Конфигурация выводов AT28C17-15PC
| Контакт 1 | NC — Not connected (per datasheet) |
| Контакт 2 | A12 — No-connect on AT28C17 (2K x 8 device) |
| Контакт 3 | A7 — Address input A7 |
| Контакт 4 | A6 — Address input A6 |
| Контакт 5 | A5 — Address input A5 |
| Контакт 6 | A4 — Address input A4 |
| Контакт 7 | A3 — Address input A3 |
| Контакт 8 | A2 — Address input A2 |
| Контакт 9 | A1 — Address input A1 |
| Контакт 10 | A0 — Address input A0 |
| Контакт 11 | I/O0 — Bidirectional data I/O 0 |
| Контакт 12 | I/O1 — Bidirectional data I/O 1 |
| Контакт 13 | I/O2 — Bidirectional data I/O 2 |
| Контакт 14 | GND — Ground |
| Контакт 15 | I/O3 — Bidirectional data I/O 3 |
| Контакт 16 | I/O4 — Bidirectional data I/O 4 |
| Контакт 17 | I/O5 — Bidirectional data I/O 5 |
| Контакт 18 | I/O6 — Bidirectional data I/O 6 |
| Контакт 19 | I/O7 — Bidirectional data I/O 7 / DATA POLLING |
| Контакт 20 | CE — Chip Enable (active low) |
| Контакт 21 | A10 — Address input A10 |
| Контакт 22 | OE — Output Enable (active low) |
| Контакт 23 | A11 — Address input A11 |
| Контакт 24 | A9 — Address input A9 |
| Контакт 25 | A8 — Address input A8 |
| Контакт 26 | NC — Not connected (per datasheet) |
| Контакт 27 | WP — Write Protect (active high) |
| Контакт 28 | VCC — +5V supply (4.5V to 5.5V) |
Типичное применение
AT28C17-15PC подходит для 6 применениеs: Configuration Parameter Storage on 8-bit Microcontrollers, Industrial Control Calibration and Setpoint Storage, Legacy Point-of-Sale Terminal Non-Volatile Memory, Repairs and Replacement in Vintage 8-bit Systems, Instrumentation Calibration and Measurement Tables, Educational Lab Memory Subsystems.
Configuration Parameter Storage on 8-bit Microcontrollers
The AT28C17-15PC stores factory calibration, runtime configuration, and user-selectable parameters on 8-bit microcontroller platforms (8051, 68HC11, Z80, PIC) that lack on-chip EEPROM or whose internal NVM has been burned out. With 16 Kbit (2K x 8) of byte-addressable storage and 150 ns access time, it satisfies the timing requirements of 12 MHz-16 MHz 8051/8085 cores. Placed on the external memory bus as a memory-mapped peripheral, the parallel interface delivers faster read-side latency than any I2C EEPROM, while on-chip write-charge-pump and self-timed byte-write keep the host CPU free during 1 ms write cycles. WRITE PROTECT (WP) hard-locks the upper array to protect bootloader-grade constants from accidental overwrite.
Рекомендуется
Industrial Control Calibration and Setpoint Storage
The AT28C17-15PC retains non-volatile calibration tables, PID gain setpoints, and trip thresholds inside PLCs, motor drivers, and process controllers. The 4.5 V to 5.5 V supply integrates cleanly with industrial 5 V logic rails, and the 28-PDIP through-hole package survives high-vibration environments far better than SOIC-8 alternatives. Each byte supports roughly 100,000 write cycles, sufficient for most field-installed setpoints that change infrequently; for high-write-throughput applications, the host can route writes through a wear-leveling routine that cycles the write pointer across the array.
Рекомендуется
Legacy Point-of-Sale Terminal Non-Volatile Memory
The AT28C17-15PC holds the non-volatile transaction log, terminal-ID, store number, and tamper-resistant counters in legacy point-of-sale terminals. The 150 ns read access delivers low-latency reads during boot and during transaction-history scrolling, while the parallel interface fits 8085-style address/data multiplexed buses natively without glue logic. The READY/BUSY open-drain output lets the host CPU interrupt on end-of-write instead of polling, and DATA POLLING on I/O7 adds a software fallback for write-completion detection in legacy BIOS routines.
Рекомендуется
Repairs and Replacement in Vintage 8-bit Systems
The AT28C17-15PC is a direct socket replacement for older Atmel-compatible 28-pin parallel EEPROMs and equivalent 2716/2732-style EPROMs on retrocomputing and restoration boards. The 28-PDIP package with 0.6 inch pin-row spacing is dimensionally drop-in compatible with the original 28-pin DIP socket on Apple II, TRS-80, CP/M, and early IBM-PC expansion cards, enabling restoration without board redesign. With 16 Kbit of storage and 5 V single-supply operation, it represents the lowest-effort replacement when an original boot ROM or NVRAM is suspected of cell degradation after decades of storage.
Рекомендуется
Instrumentation Calibration and Measurement Tables
The AT28C17-15PC stores factory-loaded calibration tables, sensor linearization lookups, and unit-conversion constants in handheld DMMs, bench multimeters, and oscilloscope front ends. Its 2 Kbyte capacity comfortably fits per-range gain trim, TC coefficients for thermocouple inputs, and 50/60 Hz true-RMS correction factors. The parallel interface lets the host processor read the calibration block in essentially one bus cycle per byte without I2C overhead, supporting single-shot ADC conversions in fast sweep-mode instrumentation.
Рекомендуется
Educational Lab Memory Subsystems
The AT28C17-15PC integrates naturally into EE/CE laboratory courses on computer architecture and embedded systems thanks to its socket-friendly 28-PDIP package and bus-exposed control signals. Course modules cover address-latching with 74373 latches, data-bus buffering with 74245 transceivers, timing analysis on the 150 ns access waveform, and self-timed write-protocol firmware. Students can hand-solder the device onto wire-wrap or breadboard prototypes without reflow equipment and gain hands-on experience with byte-write, chip-erase-before-write, and DATA POLLING semantics.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для AT28C17-15PC — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | AT28C17-15PU | AT28C17-20PC | AT28C16-15PC | M28C17-15 | X28C16P-25 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | STMicroelectronics | Renesas |
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same |
| Density | 16 Kbit (2K x 8) | 16 Kbit (2K x 8) | 16 Kbit (2K x 8) | 16 Kbit (2K x 8) | 16 Kbit (2K x 8) | 16 Kbit (2K x 8) |
| Read Access Time | 150 ns | 150 ns | 200 ns | 150 ns | 150 ns | 250 ns |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| Lead Finish | Pb-free (PC suffix) | Pb-free matte tin | Pb-free | Pb-free | Pb-free | Pb-free |
Ключевые отличия
- Industry-standard 150 ns grade in 28-PDIP socket-compatible footprint (против M28C17-15 (STMicroelectronics))
- Lead-free (Pb-free) finish on the -PC suffix (против AT28C17-15PU)
- Fastest 2K x 8 parallel EEPROM grade available at this density (против X28C16P-25 (Renesas))
- Self-timed byte write with hardware end-of-write indicators (против AT28C16-15PC)
Заметки по проектированию
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VCC pin (pin 28) and a bulk tantalum or aluminum electrolytic (typically 10 uF) within 1 inch on the +5 V supply trace. The AT28C17-15PC draws brief transients during internal write-pump operation; without adequate decoupling the VCC rail can sag and corrupt the in-flight write cycle. Keep the GND return path short - tie pin 14 directly to the ground plane with a via right at the package pin.
Use a 74HC573 or 74LS573 latch between the multiplexed 8051 address/data bus and the AT28C17-15PC A0-A10 inputs, controlled by ALE falling edge. The 150 ns access time is sufficient to capture data after ALE with one wait state on most 8051 cores running at 12 MHz; at 16 MHz (60 ns bus cycle) insert one or two wait states via RD stretch. Leave address inputs > A10 floating or pulled to GND - they are no-connect on this 2 Kbyte device but the unused die cells internally decode them and floating pins may toggle spurious block writes if WP glitches.
Always drive CE (active low) to its high level when transitioning the bus from a read to a write cycle, then re-assert CE low to begin the new cycle. Failing to toggle CE can cause a double-write or corrupted byte because the AT28C17-15PC latches the write on the first CE falling edge after WE falling. Use DATA POLLING on I/O7 - after issuing a write, read the same address; I/O7 reflects the complement of the last written bit until the internal write completes (~1 ms), then flips to true data.
Route the READY/BUSY open-drain output to a host interrupt or status GPIO and pull up to VCC with 4.7 kohm to 10 kohm. Route the WP pin through a series 10 kohm resistor to the controlling logic so an out-of-spec MCU pin transient cannot latch the device into permanent write-protected mode without state visibility. For boards mixing 5 V EEPROMs with 3.3 V MCUs, level-shift the address and control lines (but not VCC) using 74HCT245 rather than 74HC245 to guarantee TTL-input thresholds.
Информация о соответствии
RoHS, REACH, lead-free, halogen-free, and conflict-mineral compliance status was not specified in the verified web data. -PC suffix typically denotes Pb-free matte-tin lead finish on legacy Atmel products, but confirm against the manufacturer datasheet before claiming compliance for restricted-substance-sensitive designs. AEC-Q100 is not_applicable (this is a commercial-temperature 0 C to +70 C parallel EEPROM, not an automotive-grade part - consider AT28C17-15PU-Industrial or automotive-qualified equivalents for vehicle applications).
