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STMicroelectronics ST3222ECDR
- Part No.:
- ST3222ECDR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 18-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ST3222ECDR.pdf
- Description:
- IC TRANSCEIVER FULL 2/2 18SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,632
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Product details
Overview
ST3222ECDR from STMicroelectronics is a 3–5.5 V, ±15 kV ESD-protected RS-232 transceiver IC with two drivers and two receivers, 300 µA supply current, 250 Kbps guaranteed data rate, and 6 V/µs minimum slew rate. It operates down to 3 V while meeting EIA/TIA-232 and V.28/V.24 specifications, enabling robust serial communication in battery-powered portable systems.
For engineers reviewing the ST3222ECDR datasheet, ST3222ECDR pinout, ST3222ECDR application, or ST3222ECDR equivalent, key selection criteria include low-power shutdown (1 mA), true RS-232 output levels from 3 V, dual charge pump architecture requiring only four 0.1 µF capacitors, and independent receiver enable functionality during shutdown.
Technical Context
The ST3222ECDR integrates a dual charge pump generating ±5.5 V rails from a single 3–5.5 V supply, enabling full RS-232 voltage swing (±5 V) without external high-voltage sources. Its proprietary low-dropout transmitter stage ensures compliance across the entire supply range.
It supports independent control of transmitter shutdown (SHDN) and receiver enable (EN), allowing receivers to remain active while transmitters are disabled - critical for modem monitoring in portable equipment. Logic inputs accept 3.3 V and 5 V compatible thresholds with 250 mV hysteresis on transmitter inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 3 V to 5.5 V - enables direct integration into modern low-voltage embedded systems without level-shifting. |
| ESD protection | ±15 kV HBM / ±8 kV IEC 1000-4-2 contact - eliminates need for external TVS diodes on RS-232 I/O lines. |
| Data rate | 250 Kbps minimum guaranteed - supports reliable UART communication at standard baud rates up to 230.4 kbps with margin. |
| Slew rate | 6 V/µs minimum - limits EMI emissions and ensures signal integrity on long cables per RS-232 timing requirements. |
| Supply current | 300 µA typical (no load) - extends battery life in handheld and notebook applications. |
| Shutdown current | 1 µA typical - reduces system power consumption during idle periods while maintaining receiver monitoring capability. |
| Receiver input range | ±25 V - tolerates large noise transients and ground potential differences in industrial environments. |
Pinout & Package
TSSOP20 package (6.4 × 6.4 mm, 0.65 mm pitch), RoHS-compliant, ECOPACK® certified, tape-and-reel (2500 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Receiver enable control | Active-low input; drives R_OUT to high-Z when high - allows selective receiver disable without affecting transmitter state. |
| 2 C1+ | Charge pump capacitor positive terminal | Connects to + side of first 0.1 µF flying capacitor - part of dual charge pump generating V+ rail. |
| 3 V+ | +5.5 V generated supply | Output of internal charge pump - powers transmitter outputs to meet ±5 V RS-232 swing requirement. |
| 4 C1− | Charge pump capacitor negative terminal | Connects to − side of first 0.1 µF flying capacitor - completes charge transfer cycle for V+ generation. |
| 5 C2+ | Second charge pump capacitor positive terminal | Connects to + side of second 0.1 µF flying capacitor - used to generate V− rail. |
| 6 C2− | Second charge pump capacitor negative terminal | Connects to − side of second 0.1 µF flying capacitor - completes inversion cycle for V− generation. |
| 7 V− | −5.5 V generated supply | Output of internal charge pump - enables negative RS-232 output voltage swing. |
| 8 T2OUT | Second transmitter output | RS-232 compliant differential output - drives DTE/DCE interface line (e.g., TxD2 or RTS2). |
| 9 R2IN | Second receiver input | Accepts ±25 V RS-232 input signals - connects to remote device's RxD2 or CTS2 line. |
| 10 R2OUT | Second receiver output | CMOS/TTL logic-level output - interfaces directly to UART RX2 pin. |
| 11 NC | No connect | Not internally bonded - must be left floating or grounded per layout best practices. |
| 12 T2IN | Second transmitter input | CMOS/TTL logic-level input - accepts UART TX2 signal for conversion to RS-232 levels. |
| 13 T1IN | First transmitter input | CMOS/TTL logic-level input - accepts primary UART TX1 signal. |
| 14 NC | No connect | Not internally bonded - must be left floating or grounded. |
| 15 R1OUT | First receiver output | CMOS/TTL logic-level output - drives primary UART RX1 input. |
| 16 R1IN | First receiver input | RS-232 input terminal - receives signals from remote DTE/DCE RxD1 or DSR1 line. |
| 17 T1OUT | First transmitter output | Primary RS-232 output - drives local DTE/DCE TxD1 or DTR1 line. |
| 18 GND | Ground reference | Common return path for all analog and digital circuitry - requires low-impedance PCB connection. |
| 19 VCC | Main supply input | 3–5.5 V DC input - powers internal logic, charge pump control, and receiver circuitry. |
| 20 SHDN | Active-low shutdown control | Disables transmitters and charge pump when high - reduces supply current to 1 µA while preserving receiver operation if EN = low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual charge pump with four 0.1 µF capacitors | Enables full ±5 V RS-232 output swing from 3 V supply without external high-voltage generators. |
| Independent receiver enable (EN) | Allows receivers to stay active during transmitter shutdown - essential for modem status monitoring in portable devices. |
| 1 µA shutdown mode | Reduces system power draw during sleep states while retaining wake-up capability via receiver inputs. |
| ±25 V receiver input tolerance | Withstands large ground loop voltages and ESD-induced transients without latch-up or damage. |
| 250 Kbps guaranteed data rate | Ensures interoperability with legacy and modern UART peripherals without timing margin concerns. |
Applications
| Notebook Computer Serial Port | Battery-Powered Handheld Terminal |
|---|---|
|
Use Scenario: Providing RS-232 connectivity for legacy peripherals (e.g., barcode scanners, GPS modules) in ultra-thin notebooks with strict thermal and power budgets. IC Role / Device Role / Timing Role: Dual-channel RS-232 level translator interfacing 3.3 V UART to ±12 V cable-driven signals. Use Value: 300 µA quiescent current extends battery runtime; ±15 kV ESD protection eliminates external protection components. |
Use Scenario: Enabling field-serviceable serial diagnostics in handheld test equipment powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-power RS-232 transceiver supporting hot-plug detection and modem handshaking (RTS/CTS) over noisy industrial cabling. Use Value: Independent EN control allows continuous modem status polling at 1 mA while transmitters remain off - no wake-up latency. |
| Industrial Printer Interface | Point-of-Sale Peripheral Hub |
|
Use Scenario: Connecting receipt printers to embedded controllers in retail kiosks exposed to electrostatic discharge from operator interaction. IC Role / Device Role / Timing Role: Robust RS-232 driver/receiver handling bidirectional command-response protocols (e.g., ESC/POS) at 115.2 kbps. Use Value: ±25 V input tolerance accommodates ground shifts between printer and controller; 6 V/µs slew rate suppresses radiated emissions. |
Use Scenario: Aggregating multiple RS-232 peripherals (cash drawer, magnetic stripe reader, customer display) into a single USB-to-serial hub. IC Role / Device Role / Timing Role: Dual-transceiver enabling simultaneous host-to-peripheral and peripheral-to-host communication paths. Use Value: TSSOP20 footprint minimizes PCB area; ECOPACK® compliance meets RoHS/REACH requirements for global deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3222CSE+ | Higher 1 µA shutdown current (vs. ST3222ECDR's 1 µA typ); identical 250 Kbps rating and ±15 kV ESD. | Requires 0.1 µF capacitors but uses different charge pump topology - slightly higher BOM cost due to tighter capacitor tolerance requirements. | Select MAX3222CSE+ only if existing design uses Maxim reference designs or requires pin-for-pin compatibility with legacy MAX32xx layouts. |
| SP3222EEY-L | Lower 100 µA supply current (typ) but only rated to 235 Kbps; ±15 kV HBM only (no IEC 1000-4-2 contact discharge spec). | Lacks IEC-rated ESD protection - unsuitable for consumer-facing terminals where contact discharge is a certification requirement. | Choose SP3222EEY-L only for cost-sensitive, non-certified internal industrial links where IEC 1000-4-2 compliance is not mandated. |
Compared with MAX3222CSE+ and SP3222EEY-L, the ST3222ECDR uniquely combines IEC 1000-4-2 ±8 kV contact discharge certification, guaranteed 250 Kbps operation, and TSSOP20 packaging - making it optimal for CE/FCC-certified portable and retail equipment.
Availability
ST3222ECDR is available at Aetrix Electronics and suitable for notebook computers, handheld terminals, industrial printers, and point-of-sale peripheral hubs requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for ST3222ECDR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and interface solutions for automotive, industrial, and consumer markets.
The ST3222E series belongs to ST's RS-232 interface product line, engineered specifically for low-power, ESD-hardened serial communication in space-constrained portable and battery-operated systems.
FAQ
What is the minimum supply voltage required for guaranteed RS-232 compliance?
The ST3222ECDR meets EIA/TIA-232 specifications down to 3 V supply, delivering ±5 V output swing with 3 kΩ load and maintaining 250 Kbps data rate. Below 3 V, output voltage swing degrades and timing margins shrink - operation below 3 V is not characterized or guaranteed.
Can the receivers remain active while the transmitters are shut down?
Yes. When SHDN = high (shutdown active) and EN = low, transmitters and charge pump disable while receivers remain fully operational with 1 mA supply current. This enables continuous monitoring of remote device status (e.g., modem DCD or RI signals) without waking the host processor.
Which external capacitors are required, and what are their voltage ratings?
Four 0.1 µF ceramic capacitors (X7R or better) rated for ≥10 V are required: C1+, C1−, C2+, and C2−. At 3–3.6 V supply, use 0.1 µF; at 4.5–5.5 V, ST recommends 0.047 µF for C1+ and 0.33 µF for C2+/C2−/C3 to optimize charge pump efficiency and stability.
Is the ST3222ECDR pin-compatible with earlier ST3222 versions?
Yes. ST3222ECDR shares identical pinout, electrical characteristics, and package dimensions with ST3222ECTR (TSSOP20) and ST3222ECPR (SSOP20). The 'D' suffix denotes tape-and-reel packaging per JEDEC standard; functional behavior is identical across all ST3222EC variants.
ST3222ECDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 18-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 2/2
- Duplex:
- Full
- Receiver Hysteresis:
- 500 mV
- Data Rate:
- 250kbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-SO
ST3222ECDR FAQ
1.How can I place an order for ST3222ECDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST3222ECDR 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 ST3222ECDR reliable?
The price and inventory of ST3222ECDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST3222ECDR is usually 5 days.
3.What payment methods are accepted for ST3222ECDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST3222ECDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST3222ECDR?
ST3222ECDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST3222ECDR 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 ST3222ECDR?
For technical support, including ST3222ECDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST3222ECDR requirements.
6.How does Aetrix verify that ST3222ECDR is sourced from the original manufacturer or authorized distributors?
All ST3222ECDR 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 ST3222ECDR meets industry standards.
7.What is the process for return or replacement of ST3222ECDR?
All ST3222ECDR units undergo pre-shipment inspection (PSI). If there is an issue with ST3222ECDR, 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 ST3222ECDR part is unused and in its original packaging.
Return procedure for ST3222ECDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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