MAX3232ESE+T IC

Technical Specifications of MAX3232ESE+T

Datasheet	MAX3232ESE+T datasheet
Category	Integrated Circuits (ICs)
Family	Interface – Drivers, Receivers, Transceivers
Manufacturer	Maxim Integrated
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	300mV
Data Rate	120Kbps
Voltage – Supply	3 V ~ 5.5 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.154″, 3.90mm Width)
Supplier Device Package	16-SO

MAX3232ESE+T General Description

The MAX3232ESE+T transceivers can achieve true RS-232 performance from a 3.0V to 5.5V supply with their innovative low-dropout transmitter output stage. Only four 0.1F external charge-pump capacitors are needed for the devices. The MAX3222, MAX3232, and MAX3241 can maintain RS-232 output levels at assured data speeds of 120kbps. The MAX3237 has a minimum guaranteed data rate of 250kbps and a maximum of 1Mbps when running in the MegaBaudTM mode. In the case of the MAX3222/MAX3232, you get two of everything: two receivers and two drivers.

The MAX3222 and MAX3232 share the same pinout, packaging, and functionality as the conventional MAX242 and MAX232. In contrast to the MAX3237’s three receivers and five drivers, the MAX3241 features five receivers and three. Extra outputs are available on both the R1 (MAX3237/MAX3241) and R2 (MAX3241) receivers. These auxiliary outputs are permanently live, enabling the monitoring of external devices even if VCC is entirely withdrawn from the circuitry. Operating temperatures for the MAX3222, MAX3232, and MAX3241 range from -40°C to +85°C or 0°C to 70°C, respectively, making them ideal for use in a wide variety of environments.

Applications

• Battery-Powered Equipment
• Hand-Held Equipment
• Peripherals
• Datacom Equipment

Detailed Description

● Dual Charge-Pump Voltage Converter.

Input voltage (VCC) of the MAX3222/MAX3232/MAX3237/MAX3241 can be between 3.0V and 5.5V, and the internal power source, a controlled dual charge pump, will produce either +5.5V (doubling charge pump) or -5.5V (inverting charge pump) as an output. If the output voltages are less than 5.5V, the charge pumps are active, and if they are greater than 5.5V, the charge pumps are inactive. To generate the required V+ and V- supplies, each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4).

● RS-232 Transmitters.

These radios employ inverted-level translators to transform CMOS-logic levels into 5.0V EIA/TIA-232 levels. Designed to work with PC-to-PC communication programs like LapLinkTM, the MAX3222/MAX3232/MAX3241 transmitters ensure a 120kbps data rate even under the worst-case loads of 3k in parallel with 1000pF. Three of these gadgets can usually achieve speeds of 235 kilobits per second while exchanging data with one another. Multiple receivers or mice can be controlled by one transmitter when used in tandem.

When the MAX3222/MAX3237/MAX3241 is in shutdown mode, the output stage is disabled (high impedance). The MAX3222, MAX3232, MAX3237, and MAX3241 allow the outputs to be driven up to 12V even when the power is off. There is no pull-up resistor on the transmitter inputs. Join the terminals for inputs that aren’t used to GND or VCC.

● MAX3237 MegaBaud Operation

The MAX3237 transmitters ensure a data rate of 250kbps with worst-case loads of 3k in parallel with 1000pF when operating in normal mode (MBAUD = GND). This makes it work with programs that allow two computers to talk to each other, such as LapLink. The MAX3237’s MegaBaud function allows for faster serial communications. The MAX3237 transmitters, when operated in MegaBaud mode (MBAUD = VCC), ensure a 1Mbps data rate throughout a voltage range of 3.0V VCC 4.5V with worst-case loads of 3k in parallel with 250pF. MAX3237 transmitters ensure a 1Mbps data throughput into worst-case loads of 3k parallel with 1000pF when operating at 5V 10%.

● RS-232 Receivers

The receivers convert the CMOS logic output levels from the RS-232 signals. A unique feature of the MAX3222, MAX3237 and MAX3241 receivers is their inverted three-state outputs. For the duration of a power outage, receivers may be operational or not (Table 1). The MAX3241’s R1OUTB and MAX3237’s R1OUTB and R2OUTB are always on, regardless of the settings for EN and SHDN. This paves the way for using the receiver’s outputs in Ring Indicator applications without the need to reverse bias those devices. This is perfect for setups where peripherals like UARTs require a zero-voltage power supply while the system is turned off.

● MAX3222/MAX3237/MAX3241 Shutdown Mode

In standby mode (SHDN = low), the supply current drops below 1A. As the power is removed, the device’s charge pumps are deactivated, V+ is drawn to VCC, V- is pushed to the ground, and the transmitter outputs are switched off (high impedance). Normal escape from shutdown takes around 100s of seconds. If the power-down mode is never activated, connect SHDN to VCC. The values of R OUT and R OUTB are unaffected by SHDN.

● MAX3222/MAX3237/MAX3241 Enable Control

When EN is high, the outputs of the inverting receiver (R OUT) are highly resistive. When EN and SHDN are off, the complementary outputs R1OUTB and R2OUTB remain on (Table 1). Changing EN will not affect T OUT.

Applications Information

● Capacitor Selection.

Capacitors C1–C4 can either be nonpolarized or polarized, as this choice is not essential for the circuit to function. For the charge pump to function at 3.3V, 0.1F capacitors are needed. If you need to change the supply voltage. Do not go below the minimums shown in Table 2. By increasing the capacitor values (by a factor of two, for example), we can reduce ripple on the transmitter outputs and, consequently, the power consumption. You can raise C2, C3, and C4 without affecting C1.

To keep the right proportions, boosting C1 without increasing C2, C3, and C4 is not good (C1 to the other capacitors). Make sure the capacitor value doesn’t degrade too much with temperature while using the bare minimums specified. To be safe, capacitors with a greater nominal value should be used. Capacitor ripple on V+ and V- is affected by the capacitor’s equivalent series resistance (ESR), which tends to increase at lower temperatures.

● Power-Supply Decoupling

A bypass capacitor of only 0.1 F is usually all that is required. Decouple VCC to ground with a capacitor of the same magnitude as charge-pump C1 in applications particularly vulnerable to noise from the power supply. Bypass capacitors should be connected as near to the IC as practicable.

● Operation Down to 2.7V

Even with supply voltages as low as 2.7V, the transmitter outputs will be able to satisfy the EIA/TIA-562 values of 3.7V.

● Transmitter Outputs after Shutdown is Complete

Both transmitters’ outputs are demonstrated to switch to the opposite RS-232 level as soon as they become operational (one transmitter input is high, and the other is low). Each transmitter has a load consisting of a 3k resistance in parallel with a 2500pF capacitor. As soon as the transmitter is turned back on, the outputs do not exhibit any ringing or other unfavourable transients. It is important to note that the transmitters will not function until the magnitude of V- is more than 3V.

● Mouse Drivability

The MAX3241 is a serial mouse power supply that can run off low-voltage power supplies. It was created for this purpose particularly. It has been tested with top mouse brands from companies like Microsoft and Logitech, among others. The MAX3241 successfully operated all serial mice that were tested and were able to meet their individual needs for current and voltage.

Conclusion

To summarize, the MAX3232ESE+T transceiver offers exceptional performance in serial communication applications. With a low dropout transmitter output stage and a dual charge-pump voltage converter, the device can operate at high data rates of up to 235kbps, making it suitable for various applications, including battery-powered and hand-held equipment. In addition, the device’s shutdown mode minimizes power consumption to less than 1μA, making it an efficient choice for power-sensitive applications. With its small size and reliability, the MAX3232ESE+T is an excellent choice for your next project. Contact ICRFQ, your trusted electronic component distributor in China, to get started today.

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