PSD834F2V-20MI - 2Mb Flash PSD, 3.3V, 200ns, 52-PQFP | STMicroelectronics
N.º da peça: PSD834F2V-20MI ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $12.5 | $12,50 |
| 10 | $11.25 | $112,50 |
| 100 | $9.85 | $985,00 |
| 500 | $8.4 | $4.200,00 |
| 1.000 | $7.15 | $7.150,00 |
PSD834F2V-20MI Visão geral
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.
Alternativas drop-in para PSD834F2V-20MI — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PSD834F2V-15M
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PSD834F2V-20JI
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PSD834F2V-15J
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PSD834F2V-12M
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PSD834F2-70M
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PSD834F2V-20U
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PSD834F2V-20MI Classificações máximas e características elétricas
| Tipo de memória | Flash (Non-Volatile) |
| Tamanho da memória | 2 Mbit (256K x 8) primary + 256 Kbit secondary |
| SRAM Size | 64 Kbit |
| Organização da memória | 256K x 8 |
| Interface | Parallel (8-bit MCU) |
| Access Time | 200 ns |
| Tensão de alimentação | 3.0 V to 3.6 V (3.3 V nominal) |
| Temperatura de operação | -40 C to +85 C (Industrial) |
| Encapsulamento | 52-PQFP (10x10 mm) |
| Tipo de montagem | 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.) |
Configuração de pinos do PSD834F2V-20MI
| Pino 1 | VCC — 3.3V power supply |
| Pino 2 | GND — Ground |
| Pino 3 | AD0 — MCU address/data bit 0 |
| Pino 4 | AD1 — MCU address/data bit 1 |
| Pino 5 | AD2 — MCU address/data bit 2 |
| Pino 6 | AD3 — MCU address/data bit 3 |
| Pino 7 | AD4 — MCU address/data bit 4 |
| Pino 8 | AD5 — MCU address/data bit 5 |
| Pino 9 | AD6 — MCU address/data bit 6 |
| Pino 10 | AD7 — MCU address/data bit 7 |
| Pino 11 | A8 — Address bit 8 |
| Pino 12 | A9 — Address bit 9 |
| Pino 13 | A10 — Address bit 10 |
| Pino 14 | A11 — Address bit 11 |
| Pino 15 | A12 — Address bit 12 |
| Pino 16 | A13 — Address bit 13 |
| Pino 17 | A14 — Address bit 14 |
| Pino 18 | A15 — Address bit 15 |
| Pino 19 | A16 — Address bit 16 (Flash upper bank) |
| Pino 20 | A17 — Address bit 17 (Flash upper bank) |
| Pino 21 | VCC — 3.3V power supply |
| Pino 22 | GND — Ground |
| Pino 23 | CNTL0 — Control input 0 (PSEN/RD select) |
| Pino 24 | CNTL1 — Control input 1 (WR/select) |
| Pino 25 | CNTL2 — Control input 2 (ALE/latch enable) |
| Pino 26 | CSI — Chip Select In (CPLD) |
| Pino 27 | CSO0 — Chip Select Out 0 (CPLD) |
| Pino 28 | CSO1 — Chip Select Out 1 (CPLD) |
| Pino 29 | CSO2 — Chip Select Out 2 (CPLD) |
| Pino 30 | PCO0 — Peripheral I/O 0 (CPLD macrocell) |
| Pino 31 | PCO1 — Peripheral I/O 1 (CPLD macrocell) |
| Pino 32 | PCO2 — Peripheral I/O 2 (CPLD macrocell) |
| Pino 33 | PCO3 — Peripheral I/O 3 (CPLD macrocell) |
| Pino 34 | PCO4 — Peripheral I/O 4 (CPLD macrocell) |
| Pino 35 | PCO5 — Peripheral I/O 5 (CPLD macrocell) |
| Pino 36 | PCO6 — Peripheral I/O 6 (CPLD macrocell) |
| Pino 37 | PCO7 — Peripheral I/O 7 (CPLD macrocell) |
| Pino 38 | TCK — JTAG Test Clock (ISP) |
| Pino 39 | TMS — JTAG Test Mode Select (ISP) |
| Pino 40 | TDI — JTAG Test Data In (ISP) |
| Pino 41 | TDO — JTAG Test Data Out (ISP) |
| Pino 42 | TSTAT — Test Status / Ready output |
| Pino 43 | RESET — Global Reset input |
| Pino 44 | VSTBY — Standby supply for SRAM retention |
| Pino 45 | VCC — 3.3V power supply |
| Pino 46 | GND — Ground |
| Pino 47 | NC — Not connected |
| Pino 48 | NC — Not connected |
| Pino 49 | NC — Not connected |
| Pino 50 | NC — Not connected |
| Pino 51 | NC — Not connected |
| Pino 52 | NC — Not connected |
Aplicações típicas
PSD834F2V-20MI é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PSD834F2V-20MI — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- Higher-density memory than 8051 discrete solutions (vs Discrete 8051 + 29F040 + 62256 + 74HC573 design)
- Faster access than -20 grade for higher MCU clocks (vs PSD834F2V-15M)
- Industrial temperature range for harsh environments (vs Commercial-grade 28C-series parallel Flash)
Notas de projeto
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.
Informações de conformidade
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).
