Datasheet

MAX3460–MAX3464
+5V, Fail-Safe, 20Mbps, Profibus RS-485/
RS-422 Transceivers
6 _______________________________________________________________________________________
Pin Description
PIN
MAX3460/
MAX3461
MAX3462
MAX3463/
MAX3464
FULL DUPLEX
HALF
DUPLEX
NAME FUNCTION
1 ——SHDN Shutdown. Drive SHDN high to enter low-power shutdown mode.
221RO
Receiver Output. When RE is low and (A - B) ≥ -50mV, RO is high; if (A - B) ≤
-200mV, RO is low.
3 — 2 RE
Receiver Output Enable. Drive RE low to enable RO; RO is high impedance
when RE is high. Drive RE high and DE low to enter low-power shutdown mode.
4 — 3DE
Driver Output Enable. Drive DE high to enable driver output. These outputs
are high impedance when DE is low. Drive RE high and DE low to enter low-
power shutdown mode.
534DI
Driver Input. With DE high, a low on DI forces the noninverting output low and
the inverting output high. Similarly, a high on DI forces the noninverting output
high and the inverting output low.
6, 7 4 5 GND Ground
8 ——TXP
Transmitter Phase. Connect TXP to GND, or leave unconnected for normal
transmitter phase/polarity. Connect TXP to V
CC
to invert the transmitter
phase/polarity. TXP has an internal 15µA pulldown.
95— Y Noninverting Driver Output
10 6 — Z Inverting Driver Output
11 7 — B Inverting Receiver Input
12 8 — A Noninverting Receiver Input
13 ——RXP
Receiver Phase. Connect RXP to GND, or leave unconnected for normal
receiver phase/polarity. Connect RXP to V
CC
to invert the receiver
phase/polarity. RXP has an internal 15µA pulldown.
14 1 8 V
CC
Positive Supply: +4.75V ≤ V
CC
≤ +5.25V. Bypass V
CC
to GND with a 0.1µF
capacitor.
—— 7 B Inverting Receiver Input and Inverting Driver Output
—— 6 A Noninverting Receiver Input and Noninverting Driver Output
Typical Operating Characteristics (continued)
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
0
5V/div
2V/div
5V/div
0
0
DRIVER AND RECEIVER
PROPAGATION DELAYS
MAX3460-64 toc13
DI
Y, Z
RO
10ns/div
0
0
ENABLE RESPONSE TIME
MAX3460-64 toc14
DE
Y, Z
20ns/div
1V/div
5V/div
EYE DIAGRAM
MAX3460-64 toc15
10ns/div