Palm Bay, Fla. Intersil Corp. has launched a line of 3-volt RS-232 transceivers that operate as the serial interface port for cellular phones, digital cameras, personal digital assistants, palmtop computers and other battery-operated gear.
The ICL32xx RS-232 devices are five-driver, three-receiver transceivers that support data rates of 250-kbits/second and are compatible with 3.3-V-only systems, mixed 3.3-V and 5.0-V systems and 5.0V-only systems.
The 3-V devices offer 15-kV electrostatic discharge (ESD) protection for exposed RS-232 pins. Davin Yuknis, director of Intersil's Mixed Signal IC products, noted that high resistive connections are among the factors that make components susceptible to static damage.
The ICL32XXE family includes transmitter output and receiver input protection to plus/minus 15-kV ESD in compliance with the IEC1000 European standard.
The transceivers require 0.3-mA of supply current during normal operation, and they provide manual, automatic and enhanced automatic power-down features to reduce standby supply current. The power-saving features can shut down the on-chip power supply and simultaneously disable the transmitter outputs.
The automatic power-down function in the ICL3243E activates when an RS-232 cable is disconnected or when the peripheral driving the device powers down. The device powers up immediately when the cable is reconnected or the device otherwise detects a valid RS-232 level on any receiver input.
The power-down function in the ICL3244E and ICL3245E activates when the devices detect no signal on any of the receiver or transmitter inputs for a period of 30 seconds. The devices automatically power back up when signals are detected. The ICL324X transceivers come in SOIC, SSOP and TSSOP packages. In 100-piece quantities, prices range from $3.80 to $4.18.
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EETInfo No. 618