LTM2882 PIN FUNCTIONS LOGIC SIDEISOLATED SIDER2OUT (Pin A1): Channel 2 RS232 Inverting Receiver GND2 (Pins K1-K7): Isolated Side Circuit Ground. These Output. Controlled through isolation barrier from receiver pads should be connected to the isolated ground and/or input R2IN. Under the condition of an isolation communi- cable shield. cation failure R2OUT is in a high impedance state. VCC2 (Pins K8, L7-L8): Isolated Supply Voltage Output. In- T2IN (Pin A2): Channel 2 RS232 Inverting Driver Input. ternally generated from VCC by an isolated DC/DC converter A logic low on this input generates a high on isolated and regulated to 5V. Supply voltage for pins R1IN, R2IN, output T2OUT. A logic high on this input generates a low DE, and DOUT. Internally bypassed to GND2 with 2.2µF. on isolated output T2OUT. Do not float. R2IN (Pin L1): Channel 2 RS232 Inverting Receiver Input. R1OUT (Pin A3): Channel 1 RS232 Inverting Receiver A low on isolated input R2IN generates a logic high on Output. Controlled through isolation barrier from receiver R2OUT. A high on isolated input R2IN generates a logic input R1IN. Under the condition of an isolation communi- low on R2OUT. Impedance is nominally 5kΩ in receive cation failure R1OUT is in a high impedance state. mode or unpowered. T1IN (Pin A4): Channel 1 RS232 Inverting Driver Input. T2OUT (Pin L2): Channel 2 RS232 Inverting Driver A logic low on this input generates a high on isolated Output. Controlled through isolation barrier from driver output T1OUT. A logic high on this input generates a low input T2IN. High impedance when the driver is disabled on isolated output T1OUT. Do not float. (DE pin is low). DIN (Pin A5): General Purpose Non-Inverting Logic Input. R1IN (Pin L3): Channel 1 RS232 Inverting Receiver Input. A logic high on DIN generates a logic high on isolated A low on isolated input R1IN generates a logic high on output DOUT. A logic low on DIN generates a logic low R1OUT. A high on isolated input R1IN generates a logic on isolated output DOUT. Do not float. low on R1OUT. Impedance is nominally 5kΩ in receive ON (Pin A6): Enable. Enables power and data communica- mode or unpowered. tion through the isolation barrier. If ON is high the part is T1OUT (Pin L4): Channel 1 RS232 Inverting Driver enabled and power and communications are functional to Output. Controlled through isolation barrier from driver the isolated side. If ON is low the logic side is held in reset input T1IN. High impedance when the driver is disabled and the isolated side is unpowered. Do not float. (DE pin is low). VL (Pin A7): Logic Supply. Interface supply voltage for pins DOUT (Pin L5): General Purpose Non-Inverting Logic DIN, R2OUT, T2IN, R1OUT, T1IN, and ON. Operating voltage Output. Logic output connected through isolation barrier is 1.62V to 5.5V. Internally bypassed to GND with 2.2µF. to DIN. VCC (Pins A8, B7-B8): Supply Voltage. Operating volt- DE (Pin L6): Driver Output Enable. A low input forces age is 3.0V to 3.6V for LTM2882-3, and 4.5V to 5.5V for both RS232 driver outputs, T1OUT and T2OUT, into a high LTM2882-5. Internally bypassed to GND with 2.2µF. impedance state. A high input enables both RS232 driver GND (Pins B1-B6): Circuit Ground. outputs. Do not float. 2882fh 10 For more information www.linear.com/LTM2882 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS SWITCHING CHARACTERISTICS ISOLATION CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATIONS RELATED PARTS
