MAXIM Manuals

The MAX3238E/MAX3248E are 3V-powered EIA/TIA-232 and V.28/V.24 communication interfaces intended for cell phones, data cables, and modem applications.

This datasheet provides technical parameters, pin definitions, application circuits, etc. of MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E

The MAX3222/MAX3232/MAX3237/MAX3241 transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232 output levels. The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply current. The MAX3222 and MAX3232 are pin, package, and functionally compatible with the industry-standard MAX242 and MAX232, respectively. The MAX3241 is a complete serial port (3 drivers/ 5 receivers) designed for notebook and subnotebook computers. The MAX3237 (5 drivers/3 receivers) is ideal for fast modem applications. Both these devices feature a shutdown mode in which all receivers can remain active while using only 1µA supply current.

The MAX3221E/MAX3223E/MAX3243E are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features, high data- rate capabilities, and enhanced electrostatic discharge (ESD) protection. They save power without changes to the existing BIOS or operating system by entering low-power shutdown mode when the RS-232 cable is disconnected, or when the transmitters of the connected peripherals are off. The transceivers have a proprietary low-dropout transmitter output stage, delivering true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The MAX3221E contains just one driver and one receiver, making it the smallest single-supply RS-232 transceiver. The MAX3223E has two drivers and two receivers. The MAX3243E is a complete 3-driver/5-receiver serial port ideal for notebook or subnotebook computers.

This document introduces the features and characteristics of MAX3222E/MAX3232E/MAX3237E/MAX3241E communication interface products.

The MAX3250 is a 3.0V to 5.5V powered, ±50V isolated EIA/TIA-232 and V.28/V.24 communications interface with high data-rate capabilities. It is designed to operate in noisy conditions with high common-mode voltages and prevent damage from short-circuits to power buses. The device is powered by a single 3V to 5.5V supply and has two receivers and two drivers. It can run at data rates of 250kbps while maintaining RS-232 output levels. The MAX3250 is suitable for industrial control applications.

The MAX3260 high-speed transimpedance amplifier is ideally suited for Fibre Channel and SDH/SONET applications. It features a 1GHz bandwidth, single 5V supply, and a maximum input current of 900μA with a dynamic range of 25dB.

MAX3261 is a complete, easy-to-program, single +5V-powered, 1.25Gbps laser diode driver with complementary enable inputs and automatic power control (APC). The MAX3261 accepts differential PECL inputs and provides complementary output currents. A temperature-stabilized reference voltage is provided to simplify laser current programming. This allows modulation current to be programmed up to 30mA and bias current to be programmed up to 60mA with two external resistors. Complementary enable inputs allow the MAX3261 to interface with open-fiber-control architecture—a feature not found in other 1.25Gbps laser diode drivers. An APC circuit is provided to maintain constant laser power in transmitters that use a monitor photodiode. Only two external components are required to implement the APC function. The MAX3261’s fully integrated feature set includes a TTL-compatible laser failure indicator and a programmable slow-start circuit to prevent laser damage. The slow-start is preset to 50ns and can be extended by adding an external capacitor.

The MAX3263 is a complete, easy-to-program, single +5V-powered, 155Mbps laser diode driver with complementary enable inputs and automatic power control (APC). The MAX3263 accepts differential PECL inputs and provides complementary output currents. A temperature-stabilized reference voltage is provided to simplify laser current programming. This allows modulation current to be programmed up to 30mA and bias current to be programmed from up to 60mA with two external resistors. An APC circuit is provided to maintain constant laser power in transmitters that use a monitor photodiode. Only two external resistors are required to implement the APC function. The MAX3263’s fully integrated feature set includes a TTL-compatible laser failure indicator and a programmable slow-start circuit to prevent laser damage. The slow-start is preset to 50ns and can be extended by adding an external capacitor.

The MAX3266 and MAX3267 are 1.25Gbps and 2.5Gbps, low-noise fiber optic receivers with a single +3.0V to +5.5V supply voltage and no compensation capacitor.

MAX3266/MAX3267 are 1.25Gbps/2.5Gbps, +3V to +5.5V, low-noise transimpedance preamplifiers for LANs. They feature 200nA/500nA input-referred noise, 920MHz/1900MHz bandwidth, and 1mA input overload.

The MAX3264/MAX3265/MAX3268/MAX3768/MAX3765 is a optical receiver from Texas Instruments. It supports transmission speed of 1.25Gbps and 2.5Gbps, and has low jitter and programmable loss-of-signal indication.

The MAX3270 is a complete clock recovery and data retiming IC for 155Mbps and 622Mbps SDH/SONET and ATM applications.

The MAX3272/MAX3272A is a 2.5Gbps limiting amplifier that uses a single +3.3V power supply and consumes only 33mA. It features 5ps deterministic jitter, 90ps edge speed, programmable loss of signal function, CML output interface, 20-pin 4mm x 4mm QFN or thin QFN package, and selectable output polarity.