Meets or Exceeds the Requirements of

ANSI Standard EIA/TIA-232-E and ITU

Recommendation V.28

Input Resistance . . . 3 kW to 7 kW Over Full

EIA/TIA-232-E Voltage Range

Input Threshold Adjustable to Meet

Fail-Safe Requirements Without Using

External Components

Built-In Hysteresis for Increased Noise

Immunity

Inverting Output Compatible With TTL

Output With Active Pullup for Symmetrical

Switching Speeds

Standard Supply Voltages . . . 5 V or 12 V

description

The SN75154 is a monolithic low-power Schottky line receiver designed to satisfy the requirements of the

standard interface between data terminal equipment and data communication equipment as defined by ANSI

Standard EIA/TIA-232-E. Other applications are for relatively short, single-line, point-to-point data transmission

and for level translators. Operation is normally from a single 5-V supply; however, a built-in option allows

operation from a 12-V supply without the use of additional components. The output is compatible with most TTL

circuits when either supply voltage is used.

In normal operation, the threshold-control terminals are connected to the VCC1 terminal, even if power is being

supplied via the alternate VCC2 terminal. This provides a wide hysteresis loop, which is the difference between

the positive-going and negative-going threshold voltages. See typical characteristics. In this mode of operation,

if the input voltage goes to zero, the output voltage will remain at the low or high level as determined by the

previous input.

For fail-safe operation, the threshold-control terminals are open. This reduces the hysteresis loop by causing

the negative-going threshold voltage to be above zero. The positive-going threshold voltage remains above

zero as it is unaffected by the disposition of the threshold terminals. In the fail-safe mode, if the input voltage

goes to zero or an open-circuit condition, the output will go to the high level regardless of the previous input

condition.

The SN75154 is characterized for operation from 0°C to 70°C.