Datasheet LTM2881 (Analog Devices) - 9

LTM2881
pin FuncTions LOGIC SIDE (VCC, VL, GND) ISOLATED SIDE (VCC2, GND2) DOUT (Pin A1):
General Purpose Logic Output. Logic
DIN (Pin L1):
General Purpose Isolated Logic Input. Logic output connected through isolation path to DIN. Under input on the isolated side relative to VCC2 and GND2. A the condition of an isolation communication failure DOUT logic high on DIN will generate a logic high on DOUT. A is in a high impedance state. logic low on DIN will generate a logic low on DOUT.
TE (Pin A2):
Terminator Enable. A logic high enables a
SLO (Pin L2):
Driver Slew Rate Control. A low input, rela- termination resistor (typically 120Ω) between pins A and B. tive to GND2, will force the driver into a reduced slew rate
DI (Pin A3):
Driver Input. If the driver outputs are enabled mode for reduced EMI. A high input, relative to GND2, (DE high), then a low on DI forces the driver noninverting puts the driver into full speed mode to support maximum output (Y) low and the inverting output (Z) high. A high data rates. on DI, with the driver outputs enabled, forces the driver
Y (Pin L3):
Non Inverting Driver Output. High impedance noninverting output (Y) high and inverting output (Z) low. when the driver is disabled.
DE (Pin A4):
Driver Enable. A logic low disables the driver
Z (Pin L4):
Inverting Driver Output. High impedance when leaving the outputs Y and Z in a high impedance state. A the driver is disabled. logic high enables the driver.
B (Pin L5):
Inverting Receiver Input. Impedance is > 96kΩ
RE (Pin A5):
Receiver Enable. A logic low enables the in receive mode with TE low or unpowered. receiver output. A logic high disables RO to a high imped-
A (Pin L6):
Non Inverting Receiver Input. Impedance is ance state. > 96kΩ in receive mode with TE low or unpowered.
RO (Pin A6):
Receiver Output. If the receiver output is
V
ena bled (RE low) and if A – B is > 200mV, RO is a logic
CC2 (Pins L7-L8):
Isolated Supply Voltage. Internally generated from V high, if A – B is < –200mV RO is a logic low. If the receiver CC by an isolated DC/DC converter and regulated to 5V. Internally bypassed to GND2 with 2.2µF. inputs are open, shorted, or terminated without a valid signal, RO will be high. Under the condition of an isolation
GND2 (Pins K1-K8):
Isolated Side Circuit Ground. The communication failure RO is in a high impedance state. pads should be connected to the isolated ground and/or cable shield.
VL (Pin A7):
Logic Supply. Interface supply voltage for pins RO, RE, TE, DI, DE, DOUT, and ON. Recommended operating voltage is 1.62V to 5.5V. Internally bypassed to GND with 2.2µF.
ON (Pin A8):
Enable. Enables power and data communica- tion through the isolation barrier. If ON is high the part is enabled and power and communications are functional to the isolated side. If ON is low the logic side is held in reset and the isolated side is unpowered.
GND (Pins B1-B5):
Circuit Ground.
VCC (Pins B6-B8):
Supply Voltage. Recommended operat- ing voltage is 3V to 3.6V for LTM2881-3 and 4.5V to 5.5V for LTM2881-5. Internally bypassed to GND with 2.2µF. 2881fi For more information www.linear.com/LTM2881 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Switching Characteristics Isolation Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Functional Table Applications Information Typical Applications Package Description Revision History Typical Application Related Parts