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MAX3291ESD Datasheet(PDF) 7 Page - Maxim Integrated Products

Part # MAX3291ESD
Description  RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX3291ESD Datasheet(HTML) 7 Page - Maxim Integrated Products

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RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
_______________________________________________________________________________________
7
Pin Description
Preemphasis Enable Input. To enable preemphasis, leave PEE unconnected, connect to
VCC, or drive high. To enable strong-level-drive only mode, connect PEE to GND or drive
low.
PEE
1
Preemphasis Set Input. Sets the preemphasis interval. Connect a resistor (RPSET) in paral-
lel with a capacitor (CPSET) from PSET to VCC to set the preemphasis interval. See Typical
Operating Circuit.
PSET
1
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.
RE
3
3
Receiver Output. When RE is low and if A - B
≥ 200mV, RO is high; if A - B ≤ -200mV, RO
is low.
RO
2
2
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.
DI
5
5
Ground
GND
7
6, 7
No Connection. Not internally connected.
N.C.
6, 8, 13
8
Driver Output Enable. Drive DE high to enable the driver outputs. These outputs are high
impedance when DE is low. Drive RE high and DE low to enter low-power shutdown mode.
DE
4
4
Noninverting Driver Output
Y
9
9
Inverting Receiver Input
B
11
11
Connect to VCC
VCCD
13
Noninverting Receiver Input
A
12
12
Inverting Driver Output
Z
10
10
PIN
MAX3291
FUNCTION
NAME
MAX3292
R
R
Y
Z
VOD
VODP
VOC
Figure 1. Driver DC Test Load
OUTPUT
UNDER TEST
RL
S1
S2
VCC
CL
Figure 2. Driver or Receiver Enable/Disable Timing Test Load
Positive Supply: +4.75V
≤ VCC ≤ +5.25V
VCC
14
14


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