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Texas Instruments SN65C3221EPWR
- Part No.:
- SN65C3221EPWR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN65C3221EPWR.pdf
- Description:
- IC TRANSCEIVER FULL 1/1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,300
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Product details
Overview
SN65C3221EPWR from Texas Instruments is a 3-V to 5.5-V single-channel RS-232 line driver and receiver IC with ±15-kV IEC 61000-4-2 contact/air-gap ESD protection, 1-Mbit/s data rate capability, auto-powerdown feature reducing supply current to 1 μA, and integrated dual charge-pump for single-supply operation. It serves as the physical-layer interface between UART controllers and DB9/DB25 serial connectors in portable industrial terminals.
For engineers reviewing the SN65C3221EPWR datasheet, SN65C3221EPWR pinout, SN65C3221EPWR application, or SN65C3221EPWR equivalent, key selection criteria include its TSSOP-16 package compatibility with space-constrained PCBs, ±15-kV IEC ESD robustness on RIN/DOUT pins, auto-powerdown activation logic (FORCEON low + FORCEOFF high), INVALID output signaling valid RS-232 input presence, and 0.1-μF external capacitor requirement for IEC compliance.
Technical Context
The SN65C3221EPWR integrates one RS-232 driver, one receiver, and a dual charge-pump circuit generating ±5.5-V supplies from a single 3-V to 5.5-V VCC rail. Its driver output slew rate ranges from 18 V/μs to 150 V/μs, enabling reliable operation at up to 1 Mbit/s under 1000-pF load conditions.
Power management is implemented via three control inputs: FORCEON, FORCEOFF, and EN. Auto-powerdown disables drivers when no valid RS-232 signal is detected on RIN (±2.7 V threshold), reducing ICC to 1 μA; INVALID asserts high when RIN voltage exceeds ±2.7 V or remains within –0.3 V to +0.3 V for less than 30 μs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V - enables direct interfacing with 3.3-V or 5-V logic systems without level-shifting. |
| Data Rate | Up to 1 Mbit/s - supports high-speed serial communication in industrial PCs and wired networking equipment. |
| ESD Protection | ±15-kV IEC 61000-4-2 air-gap & contact discharge on RIN/DOUT - eliminates need for external TVS diodes in harsh environments. |
| Auto-powerdown Current | 1 μA typical - extends battery life in PDAs, notebooks, and handheld equipment during serial port idle periods. |
| Driver Slew Rate | 18 V/μs to 150 V/μs - balances EMI reduction and signal integrity across varying cable lengths and loads. |
| INVALID Output Logic | High = valid RS-232 input (|RIN| > 2.7 V or transient < 30 μs in ±0.3 V window) - provides real-time bus activity monitoring for host controller power-state decisions. |
| External Capacitors | Four 0.1-μF ceramic capacitors - simplifies BOM and layout versus legacy RS-232 transceivers requiring larger electrolytics. |
Pinout & Package
TSSOP-16 (PW) package, 5.3 mm × 4.4 mm body size, 0.65-mm lead pitch, RoHS-compliant NIPDAU/SN finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Receiver enable input | Low disables ROUT output (high-impedance); critical for shared-bus arbitration and power sequencing. |
| DIN (Pin 11) | Driver input | TTL/CMOS-compatible logic input accepting 3.3-V signals even when VCC = 3.3 V - eliminates level shifters. |
| DOUT (Pin 13) | RS-232 driver output | Delivers ±5.5-V compliant RS-232 signals; short-circuit protected up to ±90 mA at 5.5-V VCC. |
| RIN (Pin 8) | RS-232 receiver input | Accepts ±25-V RS-232 input range; ±15-kV IEC ESD hardened - withstands hot-plug and cable discharge events. |
| ROUT (Pin 9) | Receiver output | CMOS-level output (VOL ≤ 0.4 V, VOH ≥ VCC–0.1 V) directly interfaces with 3.3-V or 5-V UART receivers. |
| INVALID (Pin 10) | Bus validity indicator | Asserts high when RIN detects valid RS-232 levels; used by host MCU to wake from sleep or initiate data capture. |
| FORCEON (Pin 12) | Auto-powerdown enable | Low + FORCEOFF high activates auto-powerdown; prevents false triggers during noise transients. |
| FORCEOFF (Pin 16) | Global shutdown control | Low + EN high forces full shutdown (1-μA ICC); essential for system-level power gating in battery-powered designs. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates need for ±12-V rails: internal charge pump generates ±5.5-V from 3-V to 5.5-V VCC using only four 0.1-μF caps. |
| IEC 61000-4-2 ESD hardening | ±15-kV air-gap and ±8-kV contact discharge on RIN/DOUT pins meets industrial immunity standards without external protection. |
| Auto-powerdown with VALID detection | Reduces ICC to 1 μA when serial bus is inactive; INVALID pin provides hardware-level bus activity flag for low-latency wake-up. |
| Logic-level compatibility | Accepts 5-V-tolerant inputs at 3.3-V VCC - enables mixed-voltage system integration without discrete level translators. |
| Configurable power-down modes | Three distinct states: normal operation (FORCEON/FORCEOFF high), auto-powerdown (FORCEON low/FORCEOFF high), and forced shutdown (FORCEOFF low/EN high). |
Applications
| Industrial Handheld Terminals | Enterprise Network Management Interfaces |
|---|---|
|
Use Scenario: Ruggedized barcode scanners and field service tablets requiring reliable serial communication in electrically noisy factory floors. IC Role / Device Role / Timing Role: Physical-layer RS-232 transceiver bridging ARM-based SoC UARTs to legacy PLC/SCADA modems. Use Value: ±15-kV IEC ESD protection prevents field failures from static discharge during cable hot-plug; 1-μA auto-powerdown extends 8-hour battery runtime. |
Use Scenario: Out-of-band management ports on 1U rack servers and network switches connecting to console servers via RS-232 cables. IC Role / Device Role / Timing Role: Isolated RS-232 interface ensuring signal integrity over 15-m cable runs at 115.2 kbit/s. Use Value: 18–150 V/μs slew rate minimizes EMI in dense server chassis; INVALID pin enables host BIOS to detect console cable presence pre-boot. |
| Medical Point-of-Care Devices | Automated Test Equipment (ATE) Front Panels |
|
Use Scenario: Portable ultrasound machines and patient monitors with RS-232 ports for firmware updates and diagnostic logging. IC Role / Device Role / Timing Role: Low-power RS-232 transceiver supporting USB-to-serial adapters and embedded host UARTs. Use Value: TSSOP-16 footprint saves PCB area in compact enclosures; 3.3-V operation reduces thermal load near sensitive analog front-ends. |
Use Scenario: Benchtop ATE systems using RS-232 to configure DUT power supplies and signal generators during calibration sequences. IC Role / Device Role / Timing Role: Robust serial interface tolerant of ground-loop-induced noise in lab environments with multiple instrument grounds. Use Value: ±25-V receiver input range handles common-mode offsets from long cables; 1-Mbit/s capability accelerates test script execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3227EIDB | Same 16-pin TSSOP package, ±15-kV HBM but only ±8-kV IEC contact discharge; includes READY output instead of INVALID. | Lacks INVALID pin's precise ±2.7-V detection; READY indicates power-good rather than bus activity. | Select MAX3227EIDB only if READY functionality suffices and IEC contact ESD margin is acceptable per system-level testing. |
| SN65C3232EPWR | Two-driver/two-receiver variant in identical TSSOP-16 package; same ESD ratings and auto-powerdown architecture. | Supports full-duplex RS-232 with RTS/CTS flow control; requires additional PCB routing for second channel. | Choose SN65C3232EPWR when dual-channel operation is needed; SN65C3221EPWR remains optimal for space- and cost-sensitive single-channel designs. |
Compared with MAX3227EIDB, SN65C3221EPWR offers superior IEC contact ESD immunity and bus-validity awareness via INVALID; versus SN65C3232EPWR, it delivers identical performance in half the channel count and lower BOM cost for point-to-point serial links.
Availability
SN65C3221EPWR is available at Aetrix Electronics and suitable for industrial handheld terminals, enterprise network management interfaces, medical point-of-care devices, and automated test equipment requiring stable component supply across extended temperature ranges (–40°C to 85°C).
Supply support for SN65C3221EPWR 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in interface IC design and industrial-grade reliability validation.
The SN65C3221E product line targets cost-sensitive, space-constrained RS-232 applications demanding high ESD immunity and ultra-low standby power - particularly in battery-operated and harsh-environment equipment.
FAQ
What is the maximum data rate supported by the SN65C3221EPWR?
The SN65C3221EPWR supports up to 1 Mbit/s under specified conditions: CL = 250 pF with VCC = 3 V to 4.5 V, or CL = 1000 pF with VCC = 4.5 V to 5.5 V. At 1000-pF load and 3.3-V supply, the guaranteed maximum is 250 kbit/s per the switching characteristics table. Actual achievable rate depends on cable capacitance and termination.
Does the SN65C3221EPWR require external charge-pump capacitors?
Yes, the SN65C3221EPWR requires four external 0.1-μF ceramic capacitors (C1+ / C1− / C2+ / C2−) to operate its internal dual charge-pump. For IEC 61000-4-2 compliance in the TSSOP-16 (PW) package, TI specifies a minimum 1-μF bypass capacitor between VCC and GND.
How does the INVALID output function on the SN65C3221EPWR?
The INVALID output on the SN65C3221EPWR goes high when RIN detects a valid RS-232 signal - defined as voltage exceeding +2.7 V or falling below –2.7 V, or remaining within –0.3 V to +0.3 V for less than 30 μs. It asserts low when RIN stays in the indeterminate window for >30 μs, signaling invalid/noise conditions to the host controller.
What are the auto-powerdown activation conditions for the SN65C3221EPWR?
Auto-powerdown activates when FORCEON is low and FORCEOFF is high. In this mode, the driver outputs disable automatically if no valid RS-232 signal is present on RIN (per INVALID logic), reducing supply current to 1 μA. The device wakes instantly upon detection of a valid signal, with tvalid ≤ 1 μs propagation delay.
Is the SN65C3221EPWR pin-compatible with older SN65C3221 variants?
Yes, the SN65C3221EPWR shares identical pinout and electrical behavior with SN65C3221EDBR (SSOP-16) and SN65C3221EPW (TSSOP-16). All variants use the same logic diagram, timing parameters, and functional modes - enabling drop-in replacement across package types without PCB redesign.
SN65C3221EPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Full
- Receiver Hysteresis:
- 500 mV
- Data Rate:
- 1Mbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN65C3221EPWR FAQ
1.How can I place an order for SN65C3221EPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN65C3221EPWR 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 SN65C3221EPWR reliable?
The price and inventory of SN65C3221EPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN65C3221EPWR is usually 5 days.
3.What payment methods are accepted for SN65C3221EPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN65C3221EPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN65C3221EPWR?
SN65C3221EPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN65C3221EPWR 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 SN65C3221EPWR?
For technical support, including SN65C3221EPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN65C3221EPWR requirements.
6.How does Aetrix verify that SN65C3221EPWR is sourced from the original manufacturer or authorized distributors?
All SN65C3221EPWR 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 SN65C3221EPWR meets industry standards.
7.What is the process for return or replacement of SN65C3221EPWR?
All SN65C3221EPWR units undergo pre-shipment inspection (PSI). If there is an issue with SN65C3221EPWR, 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 SN65C3221EPWR part is unused and in its original packaging.
Return procedure for SN65C3221EPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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