Rainbow Electronics MAX3469 - Manual (Page 6)

MAX3465–MAX3469
+5V, Fail-Safe, 40Mbps, Profibus RS-485/
RS-422 Transceivers
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V CC = +5V, T A = +25°C, unless otherwise noted.)
DRIVER AND RECEIVER
PROPAGATION DELAYS
MAX3465 toc13
10ns/div
5V/div
5V/div
2V/div
Y, Z
DI
RO
R DIFF = 54 Ω DATA RATE = 20Mbps
ENABLE RESPONSE TIME
MAX3465 toc14
20ns/div
5V/div
1V/div
Y, Z
DE
R DIFF = 54 Ω
EYE DIAGRAM
MAX3465 toc15
10ns/div
1V/div
Y, Z
R DIFF = 54 Ω
DATA RATE = 20Mbps
Pin Description
PIN
FULL DUPLEX
HALF
DUPLEX
NAME FUNCTION
MAX3465/
MAX3466
MAX3467
MAX3468/
MAX3469
SHDN Shutdown. Drive SHDN high to enter low-power shutdown mode.
1 — — RO
Receiver Output. When RE is low and (A - B) ≥ -50mV, RO is high; if (A - B) ≤
-200mV, RO is low.
2 2 1 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.
3 — 2 DE
Driver Output Enable. Drive DE high to enable driver output. The driver
outputs are high impedance when DE is low. Drive RE high and DE low to
enter low-power shutdown mode.
4 — 3 DI
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.
5 3 4 GND Ground
6, 7 4 5 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.
8 — — Y Noninverting Driver Output
9 5 — Z Inverting Driver Output
10 6 — B Inverting Receiver Input
11 7 — A Noninverting Receiver Input
12 8 — 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.
13 — — V CC
Positive Supply: +4.75V ≤ V
CC
≤ +5.25V. Bypass V
CC to GND with a 0.1µF
capacitor.
14 1 8 B Inverting Receiver Input and Inverting Driver Output
— — 7 A Noninverting Receiver Input and Noninverting Driver Output
— — 6