MAX200

The MAX200 is a kind of transceiver designed for RS-232 and V.28 communication interfaces where ±12 V supplies are not available. On-board charge pumps convert the +5 V input to the ±10 V needed for RS-232 output levels. The MAX200 driver and receiver meets all EIA/TIA-232E and CCITT V.28 specifications at a data rate of 20 kbit/sec. The driver maintains the ±5 V EIA/TIA-232E output signal levels at data rates in excess of 120 bits/sec when loaded in accordance with the EIA/TIA-232E specification. The typical applications include computers, laptops, palmtops, notebooks, battery-powered equipment and hand-held equipment.

There are some features of MAX200 as follows: (1)0.1F to 10F external capacitors; (2)120 kbits/sec data rate; (3)small 28-pin package: uses 60% less space than SOIC; (4)low-power shutdown current: 1A; (5)designed for RS-232 and V.28 applications; (6)three-state TTL/CMOS receiver outputs.

The following is about the electrical characteristics of MAX200(VCC=5 V±5%): (1)output voltage swing: ±5 V min and ±8 V typ when all transmitter outputs loaded with 3 k to ground; (2)VCC power-supply current: 11 mA typ and 20 mA max when no load, Ta=+25; (3)shutdown supply current: 1A typ and 10A max when Ta=+25; (4)input logic threshold low: 0.8 V max at pins TIN, EN, SHDN; (5)input logic threshold high: 2.0 V min at pin TIN and 2.4 V min at pins EN, SHDN; (6)logic pull-up current: 15A typ and 200A max at TIN=0 V; (7)receiver input threshold low: 0.8 V min and 1.2 V typ at VCC=5 V, Ta=+25 when active mode; (8)receiver input threshold high: 0.6 V min and 1.5 V typ at VCC=5 V, Ta=+25 when active mode; (9)RS-232 input hysteresis: 0.2 V min, 0.5 V typ and 1.0 V max when VCC=5 V, no hysteresis in shutdown; (10)RS-232 input resistance: 3 k min, 5 k typ and 7 k max at VCC=5 V, TA=+25.