LTC2852 Linear Technology, LTC2852 Datasheet - Page 9

• Manufacturer Part Number: LTC2852
• Description: 3.3V 20Mbps RS485/RS422 Transceivers
• Manufacturer: Linear Technology

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PIN FUNCTIONS
FUNCTION TABLES
RO: Receiver Output. If the receiver output is enabled (RE
low) and A > B by 200mV, then RO will be high. If A < B
by 200mV, then RO will be low. If the receiver inputs are
open, shorted, or terminated without a valid signal, RO
will be high.
RE: Receiver Enable. A low enables the receiver. A high input
forces the receiver output into a high impedance state.
DE: Driver Enable. A high on DE enables the driver. A low
input will force the driver outputs into a high impedance.
If RE is high with DE low, the part will enter a low power
shutdown state.
DI: Driver Input. If the driver outputs are enabled (DE
high), then a low on DI forces the driver positive output
low and negative output high. A high on DI, with the driver
outputs enabled, forces the driver positive output high and
negative output low.
GND: Ground.
LTC2850
LTC2852
DE
DE
0
0
1
1
0
0
1
1
Logic Inputs
Logic Inputs
RE
RE
0
1
0
1
0
1
0
1
Shutdown
Transceive
Transmit
Receive
Mode
Shutdown
Transceive
Transmit
Receive
Mode
Y: Noninverting Driver Output for LTC2851 and LTC2852.
High-impedance when driver disabled or unpowered.
Z: Inverting Driver Output for LTC2851 and LTC2852. High-
impedance when driver disabled or unpowered.
A: Noninverting Receiver Input (and Noninverting Driver
Output for LTC2850). Impedance is >96kΩ in receive
mode or unpowered.
B: Inverting Receiver Input (and Inverting Driver Output
for LTC2850). Impedance is >96kΩ in receive mode or
unpowered.
V
ceramic capacitor.
Exposed Pad: Ground. The exposed pads on the DFN
packages must be soldered to ground.
LTC2850/LTC2851/LTC2852
CC
A, B
R
R
R
R
: Positive Supply. 3V < V
IN
IN
IN
IN
Driven
Driven
A, B
R
R
IN
IN
High-Z
High-Z
Driven
Driven
Y , Z
High-Z
High-Z
Driven
Driven
RO
High-Z
High-Z
Driven
Driven
RO
CC
< 3.6V. Bypass with 0.1μF
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