MAX3471EUA+T Maxim Integrated Products, MAX3471EUA+T Datasheet - Page 6

• Manufacturer Part Number: MAX3471EUA+T
• Description: IC TXRX DIFF RS485/422 8-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3471EUA+T

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 2.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

_______________Detailed Description
The MAX3471 half-duplex transceiver consumes only
1.6µA from a single +3.6V supply. Its wide 2.5V to 5.5V
supply voltage guarantees operation over the lifetime of
a lithium battery. This device contains one driver and
one receiver. Its true fail-safe receiver input guarantees
a logic-high receiver output when the receiver inputs
are open or shorted, or when they are connected to a
terminated transmission line with all drivers disabled.
Reduced-slew-rate drivers minimize EMI and reduce
reflections caused by improperly terminated cables,
allowing error-free data transmission up to 64kbps.
The MAX3471 receiver operates at up to 64kbps and
incorporates input filtering in addition to input hystere-
1.6µA, RS-485/RS-422, Half-Duplex,
Differential Transceiver for Battery-Powered Systems
6
(V
______________________________________________________________Pin Description
CC
PIN
_______________________________________________________________________________________
1
2
3
4
5
6
7
8
= +3.6V, T
NAME
GND
V
RO
RE
DE
DI
A
B
CC
A
= +25°C, unless otherwise noted.)
RECEIVER PROPAGATION DELAY
Receiver Output. When RE is low, if A - B ≥ -50mV, RO will be high; if A - B ≤ -450mV, RO will be low.
Receiver Output Enable. Drive RE low to enable RO; RO is high impedance when RE is high.
Driver Output Enable. Drive DE high to enable the driver outputs. These outputs are high impedance when
DE is low.
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.
Ground
Noninverting Driver Output and Noninverting Receiver Input
Inverting Driver Output and Inverting Receiver Input
Positive Supply: +2.5V ≤ V
Receiver Input Filtering
1 s/div
MAX3471toc17
Typical Operating Characteristics (continued)
CC
B
(2V/div)
A
DI
(2V/div)
A-B
(2V/div)
R
(2V/div)
O
≤ +5.5V
sis. This filtering enhances noise immunity when differ-
ential signals have very slow rise and fall times.
The MAX3471 guarantees a logic-high receiver output
when the receiver inputs are shorted or open, or when
they are connected to a terminated transmission line
with all drivers disabled. This is accomplished by set-
ting the receiver threshold between -50mV and
-450mV. If the differential receiver input voltage (A-B) is
greater than or equal to -50mV, RO is a logic high. If
A-B is less than or equal to -450mV, RO is a logic low.
In the case of a terminated bus with all transmitters dis-
abled, the receiver’s differential input voltage is pulled
to 0V by the termination. With the MAX3471’s receiver
thresholds, this results in a logic high with a 50mV mini-
mum noise margin.
FUNCTION
R = 1.5k , C
DRIVER PROPAGATION DELAY
L
= 100pF
400ns/div
MAX3471toc18
A
(2V/div)
B
DI
(2V/div)
A-B
(1V/div)