These devices are silicon gate CMOS ICs that combine both the transmitter and receiver to fulfill the electrical specifications of EIA Standard 232-E and CCITT V.28. The drivers feature true TTL input compatibility, slew rate limiting outputs, 300 a power-off source impedance, and output typically switching to within 25% of the supply rails. The receivers can handle � 25V while presenting 7 kn impedance. Hysteresis in the receivers aid in the reception of noisy signals. By combining both drivers and receivers in a single CMOS chip, these devices provide efficient, low-power solutions for both EIA-232-E and V.28 applications. These devices offer the following performance features: RECEIVERS DRIVERS

12 V Supply Range 300 Q Power-Off Source Impedance Output Current Limiting TTL and CMOS Compatible Inputs Driver Slew Rate Range Limited to 30 V/�s Maximum

� 25V Input Range 7 kn Input Impedance 0.8V of Hysteresis for Enhanced Noise Immunity TTL and CMOS Compatible Outputs Available Driver/Receiver Combinations

Rating DC Supply Voltage (VDDVCC) Input Voltage Range Rx1 - Rxn DI1 -DIn DC Current Drain per Pin Power Dissipation Operating Temperature Range Storage Temperature Range Symbol VDD VSS VCC VIR I PD

This device contains circuitry lo protect the inputs and outputs against damage due to high static voltages or electric fields: however, it is advised that normal precautions be taken to avoid applications ol any voltage higher than maximurn rated voltages to this high impedance circuit. For proper operation it is recommended that Vout and Vin be constrained to the ranges described as follows: Digital I/O: Driver Inputs (Dl): (GNDVDIVCC) Receiver Outputs (DO): (GNDVDOVCC) EIA-232 I/O: Driver Outputs (Tx): (VSSVTxl-TxnVDD) Receiver Inputs (Rx): +15 V Reliability of operation is enhanced if unused outputs are tied off to an appropriate logic voltage level (e.g., either GND or VCC for DI, and GND for Rx).

Parameter DC Supply Voltage Symbol VDD VSS VCC Quiescent Supply Current (Outputs Unloaded, Inputs Low) VDD=+12V VSS -12V VCC=+5V IDD ISS ICC Min -4.5 4.5 Typ -5 to-12 Max Unit V

Characteristic Input Turn-On Threshold Rxl - Rxn VDD=VOL Input Tum-Ofl Threshold Rxl - Rxn VDD=VOH Input Threshold Hysteresis =Von-Voff Input Resistance Rx1 -Rxn(VDD+15V) High Level Output Voltage Iout (D01-D0n) Iout=-1.0mA Low Level Output Voltage Iout =+2mA VRX - D0n) Iout +4 mA Symbol Von Voff Vhys Rin VOH VOL Min Typ Max Untt

* This is the range of input voltages as specified EIA-232-E to cause a receiver be in the high or low.

Characteristic Digital InputVoltage DII-DIn Logic 0 Logic 1 Input Current DIl - DIn VDI=GND VDI=VCC Output High Vollage Txl-Txn VDI=Logic 0. RL= VDD=+12.0V, VSS=-12.0V Output Low Voltage* Txl - Txn VDI = Logic 1, RL= VDD=+12.0 V, VSS =-12.0V Output Short Circuit Current Txl-Txn VSS=-12V Tx Shorted to GND Tx Shorted to� 15V Voltage specifications are in terms of absolute values. Symbol VIL VIH IIL IIH VOH Min VOL V Typ Max �1.0 V Unit V

Characteristic Drivers Propagation Delay Time Tx Low-to-High 50 pF High-to-Low k, CL=50pF Output Slew Rate Minimum Load CL=0 pF (VDD= to-12 V) Maximum Load 3 k, CL= 2500 pF (VDD= VCC=5 V) Receivers (CL = 50 pF) Propagation Delay Time Low-to-High High-to-Low Output Rise Time Output Fall Time Symbol Min Typ Max Unit ns tPLH tPHL SR