MAX3284EAUT+T Maxim Integrated Products, MAX3284EAUT+T Datasheet - Page 7

• Manufacturer Part Number: MAX3284EAUT+T
• Description: IC RS485/422 RECEIVER SOT23-6
• Manufacturer: Maxim Integrated Products
• Type: Receiverr

Specifications of MAX3284EAUT+T

• Number Of Drivers/receivers: 0/1
• Protocol: RS422, RS485
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

provide the same clock to their respective circuits.
Thus, minimal package-to-package skew is critical. The
skew must be kept well below the period of the clock
signal to ensure that all of the circuits on the network
are synchronized.
The standard RS-485 input impedance is 12kΩ (one-
unit load). The standard RS-485 transmitter can drive
32 unit loads. The MAX3280E/MAX3281E/MAX3283E/
MAX3284E present a 1/4-unit-load input impedance
Figure 1. Receiver Propagation Delay
Figure 2. MAX3281E/MAX3283E Receiver Enable/Disable Timing
±15kV ESD-Protected 52Mbps, 3V to 5.5V, SOT23
-1V
RO
1V
V
V
OH
OL
A
B
OUT
OUT
FOR MAX3281E THE ENABLE SIGNAL IS INVERTED.
EN
EN
f
t
IN
r
, t
0.25V
= 1MHz
f
≤ 3ns
_______________________________________________________________________________________
V
V
CC
CC
128 Receivers on the Bus
RS-485/RS-422 True Fail-Safe Receivers
/2
/2
t
PHL
t
PRHZ
INPUT
t
PRZH
OUTPUT
-1.5V
1.5V
t
PLH
V
CC
GENERATOR
/2
V
S3
CC
/2
V
CC
/2
V
0
V
0
V
0
V
0
CC
OH
CC
OH
V
ID
50Ω
S1 OPEN
S2 CLOSED
S3 = 1.5V
S1 OPEN
S2 CLOSED
S3 = 1.5V
R
C
OUT
OUT
(48kΩ), which allows up to 128 receivers on the bus.
Any combination of these RS-485 receivers with a total
of 32 unit loads can be connected to the same bus.
The MAX3280E/MAX3281E/MAX3283E/MAX3284E fea-
ture thermal protection. Thermal protection sets the out-
put stage in high-impedance mode when a short circuit
occurs at the output, limiting both the power dissipation
and temperature. The thermal temperature threshold is
+165°C, with a hysteresis of 20°C.
EN
L
EN
1kΩ
Test Circuits/Timing Diagrams
V
CC
/2
0.25V
t
PRLZ
S1
S2
t
PRZL
V
CC
V
/2
CC
/2
V
CC
Thermal Protection
V
0
V
V
V
0
V
V
CC
CC
OL
CC
CC
OL
S1 CLOSED
S2 OPEN
S3 = -1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
7