Specifications
| Type | Description |
|---|---|
| Part Number | MAX3221 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | 16-pin SSOP (DB), 6.20 mm x 5.30 mm; 16-pin TSSOP (PW), 5.00 mm x 4.40 mm |
| Supply Voltage Range | 3 to 5.5 V; Operating supply voltage VCC |
| Data Signaling Rate | up to 250 kbps; Driver/receiver operation |
| Driver Output Slew Rate | 30 V/us max; Driver output |
| RS-232 Bus-Pin ESD Protection | +/-15 kV; Human body model, bus pins |
| Standby Current | 1 uA typ; Automatic power-down mode, no valid RS-232 signal sensed |
| External Capacitors | 4 x 0.1 uF; Required external charge-pump capacitors, feature summary |
| Logic Input Compatibility | Accepts 5-V logic input with 3.3-V supply; DIN/FORCEOFF/FORCEON/EN inputs |
| Driver Count | 1; Integrated RS-232 line driver |
| Receiver Count | 1; Integrated RS-232 line receiver with enable pin |
| Absolute Maximum VCC to GND | -0.3 to 6 V; Over operating free-air temperature range |
| Absolute Maximum V+ to GND | -0.3 to 7 V; Over operating free-air temperature range |
| Absolute Maximum V- to GND | 0.3 to -7 V; Over operating free-air temperature range |
| Absolute Maximum V+ plus |V-| | 13 V max; V+ and V- absolute difference limit |
| Absolute Maximum Logic Input Voltage | -0.3 to 6 V; DIN, EN, FORCEOFF, FORCEON to GND |
| Absolute Maximum Receiver Input Voltage | +/-25 V; RIN to GND |
| Absolute Maximum Driver Output Voltage | +/-13.2 V; DOUT to GND |
| Absolute Maximum ROUT Output Voltage | -0.3 to VCC + 0.3 V; ROUT to GND |
| Junction Temperature | 150 degC max; Absolute maximum rating |
| Storage Temperature Range | -65 to 150 degC; Absolute maximum rating |
| HBM ESD Rating, Non-Bus Pins | +/-3000 V; All pins except 8 and 13, ANSI/ESDA/JEDEC JS-001 |
| HBM ESD Rating, Bus Pins | +/-15000 V; Pins 8 and 13, ANSI/ESDA/JEDEC JS-001 |
| CDM ESD Rating | +/-1500 V; Per JEDEC JESD22-C101 |
| Recommended VCC at 3.3-V Operation | 3 min, 3.3 nom, 3.6 max V; VCC = 3.3 V operating condition |
| Recommended VCC at 5-V Operation | 4.5 min, 5 nom, 5.5 max V; VCC = 5 V operating condition |
| Driver High-Level Input Voltage | 2 V min; DIN, FORCEOFF, FORCEON, EN; VCC = 3.3 V |
| Driver High-Level Input Voltage | 2.4 V min; DIN, FORCEOFF, FORCEON, EN; VCC = 5 V |
| Driver Low-Level Input Voltage | 0.8 V max; DIN, FORCEOFF, FORCEON, EN |
| Driver Input Voltage Range | 0 to 5.5 V; DIN, FORCEOFF, FORCEON, EN |
| Receiver Input Voltage Range | -25 to 25 V; Recommended operating condition |
| Operating Free-Air Temperature, C Grade | 0 to 70 degC; MAX3221C |
| Operating Free-Air Temperature, I Grade | -40 to 85 degC; MAX3221I |
| Charge-Pump Capacitors at 3.3 V | C1-C4 = 0.1 uF; VCC = 3.3 V +/-0.3 V test condition |
| Charge-Pump Capacitors at 5 V | C1 = 0.047 uF, C2-C4 = 0.33 uF; VCC = 5 V +/-0.5 V test condition |
| Junction-to-Ambient Thermal Resistance | 105.8 degC/W; DB SSOP, 16 pins |
| Junction-to-Ambient Thermal Resistance | 110.9 degC/W; PW TSSOP, 16 pins |
| Input Leakage Current | +/-0.01 typ, +/-1 max uA; FORCEOFF, FORCEON, EN |
| Supply Current, Automatic Power-Down Disabled | 0.3 typ, 1 max mA; No load, FORCEOFF and FORCEON at VCC |
| Supply Current, Powered Off | 1 typ, 10 max uA; No load, FORCEOFF at GND, VCC = 3.3 V to 5 V |
| Supply Current, Automatic Power-Down Enabled | 1 typ, 10 max uA; No load, FORCEOFF at VCC, FORCEON at GND, all RIN open or grounded |
| Driver High-Level Output Voltage | 5 min, 5.4 typ V; DOUT with RL = 3 kohm to GND, DIN = GND |
| Driver Low-Level Output Voltage | -5 max, -5.4 typ V; DOUT with RL = 3 kohm to GND, DIN = VCC |
| Driver High-Level Input Current | +/-0.01 typ, +/-1 max uA; VI = VCC |
| Driver Low-Level Input Current | +/-0.01 typ, +/-1 max uA; VI at GND |
| Driver Short-Circuit Output Current | +/-35 typ, +/-60 max mA; VCC = 3.6 V, VO = 0 V |
| Driver Short-Circuit Output Current | +/-35 typ, +/-60 max mA; VCC = 5.5 V, VO = 0 V |
| Driver Output Resistance | 300 min, 10M max ohm; VCC, V+, and V- = 0 V; VO = +/-2 V |
| Driver Output Leakage Current | +/-25 uA max; FORCEOFF = GND, VO = +/-12 V, VCC = 3 V to 3.6 V |
| Driver Output Leakage Current | +/-25 uA max; FORCEOFF = GND, VO = +/-12 V, VCC = 4.5 V to 5.5 V |
| Receiver High-Level Output Voltage | VCC - 0.6 min, VCC - 0.1 typ V; IOH = -1 mA |
| Receiver Low-Level Output Voltage | 0.4 V max; IOL = 1.6 mA |
| Receiver Positive-Going Input Threshold | 1.5 typ, 2.4 max V; VCC = 3.3 V |
| Receiver Positive-Going Input Threshold | 1.8 typ, 2.4 max V; VCC = 5 V |
| Receiver Negative-Going Input Threshold | 0.6 min, 1.1 typ V; VCC = 3.3 V |
| Receiver Negative-Going Input Threshold | 0.8 min, 1.4 typ V; VCC = 5 V |
| Receiver Input Hysteresis | 0.5 V typ; VIT+ - VIT- |
| Receiver Output Leakage Current | +/-0.05 typ, +/-10 max uA; FORCEOFF = 0 V |
| Receiver Input Resistance | 3 min, 5 typ, 7 max kohm; VI = +/-3 V to +/-25 V |
| INVALID Valid Positive Threshold | 2.7 V typ; Receiver input threshold for INVALID high-level output, FORCEON = GND, FORCEOFF = VCC |
| INVALID Valid Negative Threshold | -2.7 V typ; Receiver input threshold for INVALID high-level output, FORCEON = GND, FORCEOFF = VCC |
| INVALID Invalid Threshold | -0.3 min, 0.3 max V; Receiver input threshold for INVALID low-level output, FORCEON = GND, FORCEOFF = VCC |
| INVALID High-Level Output Voltage | VCC - 0.6 V min; IOH = -1 mA, FORCEON = GND, FORCEOFF = VCC |
| INVALID Low-Level Output Voltage | 0.4 V max; IOH = -1 mA, FORCEON = GND, FORCEOFF = VCC |
| Datasheet Status | request_only |
Product Overview
The Texas Instruments MAX3221 is an RS-232 line driver and receiver in the Signal_Chain category. It integrates one RS-232 driver and one RS-232 receiver with an enable pin, supporting driver and receiver operation up to 250 kbps. The operating supply range is 3 to 5.5 V, with recommended 3.3-V and 5-V operating ranges specified separately.
The device includes charge-pump operation using external capacitors. The feature summary lists 4 x 0.1 uF capacitors, while test conditions specify C1-C4 = 0.1 uF at 3.3 V and C1 = 0.047 uF with C2-C4 = 0.33 uF at 5 V. Logic inputs DIN, FORCEOFF, FORCEON, and EN accept 5-V logic input with a 3.3-V supply.
MAX3221 is available in 16-pin SSOP (DB), 6.20 mm x 5.30 mm, and 16-pin TSSOP (PW), 5.00 mm x 4.40 mm. It is specified for MAX3221C over 0 to 70 degC and MAX3221I over -40 to 85 degC free-air operation.
Key Features
- 3 to 5.5 V operating VCC range
- Up to 250 kbps data signaling rate
- One integrated RS-232 line driver
- One integrated RS-232 receiver with enable pin
- 30 V/us maximum driver output slew rate
- +/-15 kV HBM ESD protection on bus pins
- 1 uA typical standby current in automatic power-down
- Accepts 5-V logic input with 3.3-V supply
- 16-pin SSOP and 16-pin TSSOP package options
- Receiver input range specified from -25 to 25 V
Typical Applications
- RS-232 line driver interfaces
- RS-232 receiver interfaces
- 3.3-V logic to RS-232 conversion
- 5-V logic to RS-232 conversion
- Low-standby-current serial ports
- Single-driver single-receiver serial links
- Enabled receiver interface designs
- Charge-pump RS-232 interface circuits
Procurement Notes
When requesting a quote for MAX3221, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What supply voltage range does the MAX3221 support?
The MAX3221 operates from a 3 to 5.5 V VCC supply range. Recommended operating conditions list 3.0 to 3.6 V for 3.3-V operation and 4.5 to 5.5 V for 5-V operation.
How many RS-232 channels are integrated in the MAX3221?
The device integrates one RS-232 line driver and one RS-232 line receiver. The extracted facts also specify that the receiver includes an enable pin.
What data rate is specified for MAX3221 driver and receiver operation?
The datasheet facts specify a data signaling rate up to 250 kbps for driver and receiver operation. The driver output slew rate is listed as 30 V/us maximum.
Which packages are listed for the Texas Instruments MAX3221?
The MAX3221 package options are a 16-pin SSOP (DB), 6.20 mm x 5.30 mm, and a 16-pin TSSOP (PW), 5.00 mm x 4.40 mm.
What ESD ratings are specified for MAX3221 bus pins?
The RS-232 bus pins are specified for +/-15 kV HBM ESD protection. The detailed HBM entry lists +/-15000 V on pins 8 and 13 per ANSI/ESDA/JEDEC JS-001.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 21, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.