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STMicroelectronics ST3222EBDR
- Part No.:
- ST3222EBDR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST3222EBDR.pdf
- Description:
- IC TRANSCEIVER FULL 2/2 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,512
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Product details
Overview
ST3222EBDR from STMicroelectronics is a ±15 kV ESD-protected, 3–5.5 V low-power RS-232 transceiver IC with dual drivers/receivers, 250 Kbps guaranteed data rate, 6 V/µs minimum slew rate, and 300 µA supply current. It enables robust serial communication in battery-powered portable systems requiring true RS-232 voltage levels from single-supply operation.
For engineers reviewing the ST3222EBDR datasheet, ST3222EBDR pinout, ST3222EBDR application, or ST3222EBDR equivalent, key selection criteria include shutdown current (1 µA), ESD rating (±15 kV HBM), charge pump capacitor count (4 × 0.1 µF), receiver enable control, and TSSOP20 package compatibility with space-constrained PCB layouts.
Technical Context
The ST3222EBDR integrates a dual charge pump to generate ±5.4 V RS-232 output swings from 3–5.5 V VCC, supporting full compliance with EIA/TIA-232 down to 3 V. Its proprietary low-dropout transmitter stage eliminates external voltage rails while maintaining ±5 V output under 3 kΩ load.
It features independent EN and SHDN controls: EN places receivers in high-Z state without affecting transmitters; SHDN disables transmitters and charge pump but allows receivers to remain active at 1 mA. Propagation delays are tightly matched (≤200 ns skew) for reliable timing-critical UART links.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - Enables direct integration into 3.3 V or 5 V logic domains without level-shifting. |
| Data Rate | 250 Kbps min - Guarantees reliable UART communication up to 250 kbaud with full RS-232 signal integrity. |
| ESD Protection | ±15 kV HBM, ±8 kV IEC 1000-4-2 contact - Eliminates need for external TVS diodes on RS-232 I/O lines. |
| Supply Current | 300 µA typical - Reduces power budget impact in always-on serial monitoring applications. |
| Shutdown Current | 1 µA max - Extends battery life in handheld devices during idle periods while retaining receiver wake-up capability. |
| Slew Rate | 6 V/µs min - Limits EMI emissions and ensures clean edge transitions across noisy industrial environments. |
| Output Swing | ±5 V min into 3 kΩ - Meets EIA/TIA-232 specification for driver output amplitude without external boost circuitry. |
Pinout & Package
TSSOP20 package: 6.5 mm × 4.4 mm, 0.65 mm pitch, lead-free ECOPACK® compliant, suitable for automated SMT assembly and thermal-aware routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Receiver enable control | Active-low input; drives R_OUT to high-Z when high, enabling selective receiver isolation without disabling transmitters. |
| 2 C1+, 4 C1−, 5 C2+, 6 C2− | Charge pump capacitor terminals | Interface four 0.1 µF external capacitors to generate ±5.4 V internal rails from 3–5.5 V VCC. |
| 3 V+, 7 V− | Internally generated supply rails | V+ = +5.5 V, V− = −5.5 V - Provide true RS-232 voltage levels; not user-accessible power inputs. |
| 8 T2OUT, 17 T1OUT | Transmitter outputs | RS-232-compliant differential outputs driving TxD lines; support ±5 V swing into 3 kΩ load. |
| 9 R2IN, 16 R1IN | Receiver inputs | Accept ±25 V RS-232 input range; include 5 kΩ typical input resistance and 0.5 V hysteresis for noise immunity. |
| 10 R2OUT, 15 R1OUT | Receiver outputs | CMOS/TTL-compatible logic outputs (VOL ≤ 0.4 V, VOH ≥ VCC−0.6 V) interfacing directly with UART controllers. |
| 12 T2IN, 13 T1IN | Transmitter inputs | CMOS/TTL logic inputs with 0.8 V VIH threshold at 3.3 V VCC - compatible with standard microcontroller GPIOs. |
| 18 GND | Analog/digital ground reference | Common return path for charge pump, transmitters, and receivers; requires low-impedance PCB connection. |
| 19 VCC | Main supply input | 3–5.5 V power source; powers logic core, charge pump controller, and receiver outputs. |
| 20 SHDN | Active-low shutdown control | Disables transmitters and charge pump; receivers remain active at 1 mA, enabling modem presence detection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual charge pump architecture | Generates ±5.4 V RS-232 output rails from single 3–5.5 V supply using only four 0.1 µF capacitors - no external DC/DC converter needed. |
| Independent receiver enable (EN) | Allows dynamic isolation of R1OUT/R2OUT without affecting transmitter operation or shutdown state - critical for multi-drop RS-232 bus arbitration. |
| Receiver-active shutdown mode | Maintains receiver monitoring capability at 1 mA total supply current while disabling transmitters - extends battery life in portable modems and diagnostic tools. |
| Matched propagation delays | Transmitter skew ≤200 ns and receiver skew ≤50 ns ensure deterministic UART frame timing across both channels - essential for synchronous multi-channel protocols. |
| Wide input voltage tolerance | Rx inputs withstand ±25 V - protects against cable-induced transients and hot-plug events in industrial fieldbus interfaces. |
Applications
| Handheld Diagnostic Tool | Industrial PLC Serial Port |
|---|---|
|
Use Scenario: Portable field technician tool connecting to legacy machinery via RS-232 for firmware updates and sensor readouts. IC Role / Device Role / Timing Role: Dual-channel RS-232 level shifter translating 3.3 V UART signals to ±5 V line drivers/receivers with ESD-hardened I/O. Use Value: 300 µA operating current and 1 µA shutdown current extend battery runtime beyond 48 hours; ±15 kV HBM protection prevents field failures during cable handling. |
Use Scenario: DIN-rail mounted programmable logic controller communicating with HMIs and motor drives over long RS-232 cables in factory environments. IC Role / Device Role / Timing Role: Robust physical layer interface providing noise-immune signal translation between isolated MCU UART and unshielded serial bus. Use Value: 6 V/µs slew rate limits radiated emissions; ±25 V Rx input range tolerates ground potential differences across distributed equipment. |
| Medical Point-of-Care Device | Point-of-Sale Terminal |
|
Use Scenario: Battery-powered patient monitor transmitting vitals to central nursing station via RS-232 printer or data logger. IC Role / Device Role / Timing Role: Low-power transceiver enabling always-on serial logging with wake-on-Rx capability during sleep mode. Use Value: Receiver remains active in SHDN mode at 1 mA, allowing external modem to trigger wake-up without full system power-up - conserves energy per IEC 62304 Class B requirements. |
Use Scenario: Compact retail terminal interfacing with legacy receipt printers and barcode scanners using RS-232 connections. IC Role / Device Role / Timing Role: Space-efficient TSSOP20 interface bridging 3.3 V SoC UART to multiple peripheral devices with shared bus control. Use Value: Independent EN pin permits software-selective receiver disable during printer handshaking, preventing data corruption from scanner Tx noise. |
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. ST3222EBDR's 1 µA max); identical 250 Kbps rate and ±15 kV HBM rating; requires 0.1 µF × 4 caps. | Same TSSOP20 footprint and pinout; supports identical 3–5.5 V supply range and dual-driver/receiver topology. | Select MAX3222CSE+ if sourcing from Maxim Integrated preferred distributors or when cross-qualifying for second-source assurance. |
| SP3222ET-L | Lower 100 µA typical supply current (vs. 300 µA); same ±15 kV HBM, 250 Kbps, and TSSOP20 package; uses charge pump with 0.1 µF × 4. | Identical functional behavior and pin compatibility; optimized for ultra-low-quiescent-current portable designs where <200 µA is mandatory. | Choose SP3222ET-L when system-level sleep-mode current budget is constrained below 200 µA and full ST3222E feature set is not required. |
Compared with MAX3222CSE+ and SP3222ET-L, the ST3222EBDR delivers balanced performance across ESD margin, data rate guarantee, and thermal efficiency in TSSOP20 - making it optimal for cost-sensitive industrial and medical designs requiring ST's ECOPACK® compliance and broad temperature support (−40 to +85 °C).
Availability
ST3222EBDR is available at Aetrix Electronics and suitable for industrial PLC serial ports, handheld diagnostic tools, medical point-of-care monitors, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ST3222EBDR 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 analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
The ST3222E product line targets low-power, ESD-hardened RS-232 interface needs in portable and harsh-environment electronics - emphasizing single-supply operation, minimal external components, and extended temperature reliability.
FAQ
What is the minimum external capacitor value required for ST3222EBDR operation at 3.3 V?
The ST3222EBDR requires four 0.1 µF ceramic capacitors (C1+, C1−, C2+, C2−) for stable charge pump operation at 3.3 V. These values are specified in Table 11 of the datasheet and validated across −40 to +85 °C; reducing below 0.1 µF risks output voltage droop and data corruption at 250 Kbps.
Can ST3222EBDR operate with only one transmitter channel enabled?
Yes - the ST3222EBDR supports independent channel use: T1OUT/T1IN and R1OUT/R1IN can be active while T2OUT/T2IN and R2OUT/R2IN are unused. No configuration register is needed; unused pins may be left unconnected or tied to GND/VCC per signal integrity guidelines in Section 4 of the datasheet.
Does ST3222EBDR require a specific power-up sequencing order?
Yes - the datasheet mandates VCC must be applied before V+ and V−. Since V+ and V− are internally generated, this means the device must be powered from VCC first; externally applying voltages to V+ or V− is prohibited and may cause latch-up. Startup sequence is enforced by internal charge pump control logic.
How does the EN pin interact with SHDN during simultaneous assertion?
When both EN = high and SHDN = low, receivers enter high-Z state while transmitters remain active (per Table 4 truth table). This combination allows selective receiver disable without disrupting ongoing transmission - useful in half-duplex RS-232 bus arbitration where Tx must continue while Rx listens to other nodes.
ST3222EBDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
ST3222EBDR FAQ
1.How can I place an order for ST3222EBDR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST3222EBDR 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 ST3222EBDR reliable?
The price and inventory of ST3222EBDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST3222EBDR is usually 5 days.
3.What payment methods are accepted for ST3222EBDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST3222EBDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST3222EBDR?
ST3222EBDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST3222EBDR 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 ST3222EBDR?
For technical support, including ST3222EBDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST3222EBDR requirements.
6.How does Aetrix verify that ST3222EBDR is sourced from the original manufacturer or authorized distributors?
All ST3222EBDR 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 ST3222EBDR meets industry standards.
7.What is the process for return or replacement of ST3222EBDR?
All ST3222EBDR units undergo pre-shipment inspection (PSI). If there is an issue with ST3222EBDR, 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 ST3222EBDR part is unused and in its original packaging.
Return procedure for ST3222EBDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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