ZHHXDZ HX232-S

The HX232-S series of line drivers/receivers are designed for use in all EIA/TIA-232E and V.28/V.24 communication interfaces, particularly in scenarios where ±12V is unavailable. Available in four distinct packages, the HX232-S series can operate within a temperature range of -40°C to +85°C. The HX232-S series comprises dual charge-pump DC-DC voltage converters, RS-232 drivers, RS-232 receivers, and enable control inputs for both receiver and transmitter. The organization of these sections allows for a versatile and efficient communication interface solution. The HX232-S series incorporates two internal charge-pumps, converting +5V to ±10V (unloaded) for RS-232 driver operation. The first converter utilizes capacitor C1 to double the +5V input, resulting in +10V on C3 at the V+ output. Conversely, the second converter employs capacitor C2 to invert the +10V to -10V on C4, generating the V- output. The typical driver output voltage swing of the HX232-S series is ±8V when loaded with a nominal 5k RS-232 receiver and VCC = +5V. This output swing is guaranteed to meet the EIA/TIA-232E and V.28 specifications, which require a minimum driver output level of ±5V under worst-case conditions, including a minimum load of 3k, VCC = +4.5V, and maximum operating temperature. Unloaded driver output voltage ranges from (V+ - 1.3V) to (V- + 0.5V). Input thresholds of the HX232-S series are compatible with both TTL and CMOS. Unused driver inputs can be left unconnected due to the built-in 400k input pull-up resistors to VCC. These resistors force the outputs of unused drivers low because all drivers invert. Driver outputs turn off and enter a high-impedance state with leakage current typically in the microamperes range (maximum 25μA) when in shutdown mode, three-state mode, or when device power is removed. Outputs can be driven to ±15V. Power-supply current typically drops to 8μA in shutdown mode. Unused inputs should be connected to GND or VCC. When in low-power shutdown mode, the driver outputs are turned off and their leakage current is less than 1μA with the driver output pulled to ground. The driver output slew rate is limited to less than 30V/μs as required by the EIA/TIA-232E and V.28 specifications. Typical slew rates are 24V/μs unloaded and 10V/μs loaded with 3Ω and 2500pF. RS-232 receivers are designed to comply with the EIA/TIA-232E and V.28 specifications, which define a voltage level greater than 3V as a logic 0. This inversion is applied to all receivers, ensuring compatibility with various input thresholds. TTL level inputs, as well as EIA/TIA-232E and V.28 levels, are effectively recognized by receivers, thanks to thresholds set at 0.8V and 2.4V. The receiver inputs are designed to withstand input over voltages up to ±25V and include terminating resistors with a nominal value of 5k. These receivers implement Type 1 interpretation of the fault conditions specified by V.28 and EIA/TIA-232E. The input hysteresis of the receiver is typically 0.5V, with a guaranteed minimum of 0.2V.

• Enables operation with a single +5V supply, eliminating the need for a bipolar ±12V supply.
• Saves board space and power with its integrated charge pump circuitry.
• Reduces power requirements, saving energy efficiently. Eliminates the need for complex Bipolar ±12V supplies, streamlining the system.
• Integrated circuit design saves valuable space on the circuit board.

• Multidrop RS-232 Network Interface Translation
• Portable Diagnostics Equipment