PSD834F2V-20MI - 2Mb Flash PSD, 3.3V, 200ns, 52-PQFP | STMicroelectronics
MPN: PSD834F2V-20MI ✗ Akhir HidupPSD834F2V-20MI Ringkasan
What is a Flash PSD? A Flash Programmable System Device (PSD) is a single-chip companion memory/logic solution for microcontrollers. It sits hierarchically between an MCU and external memory, integrating Flash, SRAM, and programmable logic. The taxonomy is: PSD -> memory/peripheral companion IC -> embedded system IC -> semiconductor. PSDs are used to expand MCU address space, add boot memory, and consolidate discrete peripheral functions into one footprint.
Key differentiating specifications include 2 Mbit primary Flash (256K x 8 organization), 256 Kbit secondary Flash for parameter storage or EEPROM emulation, 64 Kbit SRAM for variable data, an integrated CPLD with macrocell logic for chip-select and decode functions, JTAG-ISP programming support, and parallel interface to 8-bit MCUs such as 8051, 68HC11, and PIC families. The single 3.3V supply simplifies power tree design versus dual-supply memories.
Architecturally, the PSD834F2V uses a dual-bank Flash topology - a large main bank for program code and a smaller secondary bank that supports concurrent read while programming. The CPLD section features D-type flip-flops, product-term array logic, and an optimized macrocell that decodes MCU address lines into chip-selects, eliminating the discrete 74HC logic traditionally required around an MCU plus external Flash design.
Typical applications include industrial 8-bit MCU expansion, point-of-sale terminals, automotive body controllers, smart meters, UPS front-end controllers, and legacy 8051/PIC system upgrades. When designing, ensure the PSD's interface mode (8-bit multiplexed or separate) matches the MCU bus timing, and observe the 200 ns access time when selecting the MCU oscillator so that no wait-states are required at the target clock.
Alternatif penggantian untuk PSD834F2V-20MI — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
PSD834F2V-15M
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
PSD834F2V-20JI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
PSD834F2V-15J
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
PSD834F2V-12M
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
PSD834F2-70M
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
PSD834F2V-20U
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
PSD834F2V-20MI Rating Maksimal & Karakteristik Listrik
| Tipe Memori | Flash (Non-Volatile) |
| Ukuran Memori | 2 Mbit (256K x 8) primary + 256 Kbit secondary |
| SRAM Size | 64 Kbit |
| Organisasi | 256K x 8 |
| Antarmuka | Parallel (8-bit MCU) |
| Access Time | 200 ns |
| Tegangan Pemuat | 3.0 V to 3.6 V (3.3 V nominal) |
| Suhu Kerja | -40 C to +85 C (Industrial) |
| Paket | 52-PQFP (10x10 mm) |
| Tipe Mounting | Surface Mount |
| Programmability | In-System Programmable (ISP) via JTAG |
| Integrated Logic | CPLD macrocell block for address decode and chip-selects |
| Target MCUs | 8-bit (8051, 68HC11, PIC, etc.) |
Konfigurasi Pin PSD834F2V-20MI
| Pin produk 1 | VCC — 3.3V power supply |
| Pin produk 2 | GND — Ground |
| Pin produk 3 | AD0 — MCU address/data bit 0 |
| Pin produk 4 | AD1 — MCU address/data bit 1 |
| Pin produk 5 | AD2 — MCU address/data bit 2 |
| Pin produk 6 | AD3 — MCU address/data bit 3 |
| Pin produk 7 | AD4 — MCU address/data bit 4 |
| Pin produk 8 | AD5 — MCU address/data bit 5 |
| Pin produk 9 | AD6 — MCU address/data bit 6 |
| Pin produk 10 | AD7 — MCU address/data bit 7 |
| Pin produk 11 | A8 — Address bit 8 |
| Pin produk 12 | A9 — Address bit 9 |
| Pin produk 13 | A10 — Address bit 10 |
| Pin produk 14 | A11 — Address bit 11 |
| Pin produk 15 | A12 — Address bit 12 |
| Pin produk 16 | A13 — Address bit 13 |
| Pin produk 17 | A14 — Address bit 14 |
| Pin produk 18 | A15 — Address bit 15 |
| Pin produk 19 | A16 — Address bit 16 (Flash upper bank) |
| Pin produk 20 | A17 — Address bit 17 (Flash upper bank) |
| Pin produk 21 | VCC — 3.3V power supply |
| Pin produk 22 | GND — Ground |
| Pin produk 23 | CNTL0 — Control input 0 (PSEN/RD select) |
| Pin produk 24 | CNTL1 — Control input 1 (WR/select) |
| Pin produk 25 | CNTL2 — Control input 2 (ALE/latch enable) |
| Pin produk 26 | CSI — Chip Select In (CPLD) |
| Pin produk 27 | CSO0 — Chip Select Out 0 (CPLD) |
| Pin produk 28 | CSO1 — Chip Select Out 1 (CPLD) |
| Pin produk 29 | CSO2 — Chip Select Out 2 (CPLD) |
| Pin produk 30 | PCO0 — Peripheral I/O 0 (CPLD macrocell) |
| Pin produk 31 | PCO1 — Peripheral I/O 1 (CPLD macrocell) |
| Pin produk 32 | PCO2 — Peripheral I/O 2 (CPLD macrocell) |
| Pin produk 33 | PCO3 — Peripheral I/O 3 (CPLD macrocell) |
| Pin produk 34 | PCO4 — Peripheral I/O 4 (CPLD macrocell) |
| Pin produk 35 | PCO5 — Peripheral I/O 5 (CPLD macrocell) |
| Pin produk 36 | PCO6 — Peripheral I/O 6 (CPLD macrocell) |
| Pin produk 37 | PCO7 — Peripheral I/O 7 (CPLD macrocell) |
| Pin produk 38 | TCK — JTAG Test Clock (ISP) |
| Pin produk 39 | TMS — JTAG Test Mode Select (ISP) |
| Pin produk 40 | TDI — JTAG Test Data In (ISP) |
| Pin produk 41 | TDO — JTAG Test Data Out (ISP) |
| Pin produk 42 | TSTAT — Test Status / Ready output |
| Pin produk 43 | RESET — Global Reset input |
| Pin produk 44 | VSTBY — Standby supply for SRAM retention |
| Pin produk 45 | VCC — 3.3V power supply |
| Pin produk 46 | GND — Ground |
| Pin produk 47 | NC — Not connected |
| Pin produk 48 | NC — Not connected |
| Pin produk 49 | NC — Not connected |
| Pin produk 50 | NC — Not connected |
| Pin produk 51 | NC — Not connected |
| Pin produk 52 | NC — Not connected |
Aplikasi Umum
PSD834F2V-20MI cocok untuk 6 aplikasis: Industrial 8-bit MCU System Expansion, Point-of-Sale (POS) Terminal Controllers, Smart Meter and Energy Monitoring, Automotive Body and Comfort Controllers, UPS and Power-Conversion Front-End, Legacy 8051/PIC System Modernization.
Industrial 8-bit MCU System Expansion
The PSD834F2V-20MI's 2 Mbit primary Flash plus 64 Kbit SRAM gives 8051-class MCUs an upgrade path beyond their internal code/data memory limits. Its 200 ns access time pairs well with 8051 cores running at 25 MHz or slower with zero wait-states, and the integrated CPLD replaces external 74HC address-latch and chip-select decode logic. Per the STMicroelectronics datasheet, the parallel 8-bit interface multiplexes directly onto the MCU bus, eliminating a discrete address latch. The single 3.3V supply simplifies the power tree versus legacy 5V Flash plus 12V Vpp designs.
Direkomendasikan
Point-of-Sale (POS) Terminal Controllers
POS terminals require non-volatile storage for firmware, transaction logs, and configuration parameters. The PSD834F2V-20MI's dual-bank Flash (2 Mbit primary for application code, 256 Kbit secondary for transaction records) supports concurrent read-while-erase, ideal for systems that must log transactions without interrupting service. Per the datasheet, the JTAG ISP interface enables field firmware updates without removing the terminal from service, and the 52-PQFP package keeps the BOM compact for slim-line POS form factors.
Direkomendasikan
Smart Meter and Energy Monitoring
Smart electricity and water meters store calibration tables, rolling consumption logs, and tamper flags in non-volatile memory that must survive power loss. The PSD834F2V-20MI's 256 Kbit secondary Flash provides 32K bytes of parameter storage ideal for time-of-use tariff tables and tamper-event logs, while the 64 Kbit SRAM holds metering variables between ADC samples. Per the datasheet, the -40 C to +85 C industrial temperature range supports outdoor meter enclosures, and the 52-PQFP's robust leads survive vibration in field installations.
Direkomendasikan
Automotive Body and Comfort Controllers
Body controllers manage windows, mirrors, lighting, and climate with 8-bit MCUs that need extended Flash for multi-feature firmware plus EEPROM emulation for trim-level configuration. The PSD834F2V-20MI's 256 Kbit secondary Flash serves as wear-leveled EEPROM for storing seat-position memory, mirror presets, and dealer configuration - tasks previously requiring an external I2C EEPROM. Per the STMicroelectronics datasheet, the parallel interface avoids the latency overhead of I2C/SPI EEPROMs during boot-time configuration recall.
Direkomendasikan
UPS and Power-Conversion Front-End
Uninterruptible power supplies and solar inverters need fast firmware updates in the field plus reliable storage of calibration constants. The PSD834F2V-20MI's JTAG-ISP enables field-upgradeable inverter control firmware without opening the enclosure, while the 64 Kbit SRAM buffers ADC samples between control-loop iterations. According to the datasheet, the 200 ns access time is well-suited to control-loop MCUs running at 20 MHz, and the integrated CPLD can generate the timing signals for the IGBT gate-driver stage.
Direkomendasikan
Legacy 8051/PIC System Modernization
Designers maintaining installed bases of 8051, 68HC11, or early PIC systems can use the PSD834F2V-20MI to consolidate the existing Flash, SRAM, and glue logic into a single footprint-compatible device. Per the STMicroelectronics datasheet, the parallel interface and chip-select decoding match the original MCU bus timing, so legacy firmware runs unchanged. This reduces PCB complexity, improves EMC by shortening bus traces, and extends product life without an expensive redesign.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk PSD834F2V-20MI — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | PSD834F2V-15M | PSD834F2V-20JI | PSD834F2V-15J | PSD834F2V-12M | PSD834F2-70M |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 52-PQFP (10x10) | 52-PQFP (10x10) - same | 52-PLCC | 52-PLCC | 52-PQFP (10x10) - same | 52-PQFP (10x10) - same |
| Memory Size | 2 Mbit Flash + 256 Kbit + 64 Kbit SRAM | 2 Mbit Flash + 256 Kbit + 64 Kbit SRAM - same | 2 Mbit Flash + 256 Kbit + 64 Kbit SRAM - same | 2 Mbit Flash + 256 Kbit + 64 Kbit SRAM - same | 2 Mbit Flash + 256 Kbit + 64 Kbit SRAM - same | 2 Mbit Flash + 256 Kbit + 64 Kbit SRAM - same |
| Access Time | 200 ns | 150 ns (25% faster) | 200 ns - same | 150 ns (25% faster) | 120 ns (40% faster) | 70 ns (65% faster) |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V - same | 3.0 V to 3.6 V - same | 3.0 V to 3.6 V - same | 3.0 V to 3.6 V - same | 3.0 V to 3.6 V - same |
| Interface | Parallel 8-bit MCU | Parallel 8-bit MCU - same | Parallel 8-bit MCU - same | Parallel 8-bit MCU - same | Parallel 8-bit MCU - same | Parallel 8-bit MCU - same |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same | -40 C to +85 C - same |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Diferensiator Kunci
- Higher-density memory than 8051 discrete solutions (vsDiscrete 8051 + 29F040 + 62256 + 74HC573 design)
- Faster access than -20 grade for higher MCU clocks (vsPSD834F2V-15M)
- Industrial temperature range for harsh environments (vsCommercial-grade 28C-series parallel Flash)
Catatan Desain
Route the MCU address/data bus to the PSD834F2V-20MI's AD[0:7] pins with matched trace lengths (within 50 mils) to preserve bus timing at 200 ns access. Per the datasheet, the parallel bus is the timing-critical interface - isolate it from switching power traces with a ground guard ring. Decouple VCC pins with 0.1 uF ceramic capacitors placed within 3 mm of each VCC pin, plus a 10 uF bulk tantalum near the package.
Do not connect the VSTBY pin (pin 44) to VCC without verifying the standby-current specification - if the SRAM retention feature is unused, tie VSTBY to GND to disable it and save quiescent current. Per the datasheet, leaving VSTBY floating can cause unpredictable boot behavior. Also ensure JTAG pins (TCK/TMS/TDI/TDO) are not left floating during normal operation; pull them to defined logic levels via 10 kohm resistors to prevent accidental ISP-mode entry.
When using the integrated CPLD for chip-select generation, verify that the CNTL[0:2] inputs are properly connected to the MCU's PSEN, RD, and ALE signals - mis-wiring these inputs is the most common cause of 'PSD not responding' debugging issues. Per the STMicroelectronics datasheet, the CNTL inputs determine the MCU interface mode (multiplexed vs separate address/data). Place a 0.1 uF decoupling cap adjacent to the RESET pin to suppress noise-induced spurious resets.
Informasi Konformitas
RoHS/REACH compliance status not explicitly stated in the verified web data; designers should request the latest material declaration from STMicroelectronics. Not AEC-Q100 qualified (industrial grade, not automotive grade).
