Datasheet

Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
Pin Description (continued)
12 8 — 12 — A Noninverting Receiver Input
— — — — 12 A
HALF-
DUPLEX
MODE
MAX3089
FULL-
DUPLEX
MODE
FULL-DUPLEX
DEVICES
MAX3081
MAX3084
MAX3087
HALF-
DUPLEX
DEVICES
MAX3082
MAX3085
MAX3088
FUNCTIONNAME
MAX3080
MAX3083
MAX3086
Receiver Input Resistors*
— — 6 — — A Noninverting Receiver Input and Noninverting Driver Output
— — — 13 13 RXP
Receiver Phase. Connect RXP to GND, or leave unconnected for
normal transmitter phase/polarity. Connect to V
CC
to invert the
receiver phase/polarity.
14 1 8 14 14 V
CC
Positive Supply; 4.75V ≤ V
CC
≤ 5.25V
1, 8, 13 — — — — N.C. Not Connected. Not internally connected.
Function Tables
TRANSMITTING
INPUTS OUTPUTS
RE
DE DI Z Y
X 1 1 0 1
X 1 0 1 0
0 0 X High-Z High-Z
1 0 X Shutdown
RECEIVING
INPUTS OUTPUT
RE
DE A-B RO
0 X ≥ -0.05V 1
0 X ≤ -0.2V 0
0 X Open/shorted 1
1 1 X High-Z
1 0 X Shutdown
TRANSMITTING
INPUT OUTPUTS
DI Z Y
1 0 1
0 1 0
RECEIVING
INPUTS OUTPUT
A-B RO
≥ -0.05V 1
≤ -0.2V 0
Open/shorted 1
PIN
X = Don’t care
Shutdown mode, driver and receiver outputs high impedance
*(MAX3089 only.) In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs (A and B) will still
have a 1/8-unit load, but are not connected to the receiver.
MAX3081/MAX3084/MAX3087MAX3080/MAX3083/MAX3086
Maxim Integrated
11
MAX3080–MAX3089