參數(shù)資料
型號: MAX563
廠商: Maxim Integrated Products, Inc.
英文描述: +3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown(3.3V,雙組EIA/TIA-562接收器)
中文描述: +3.3V供電、EIA TIA 562雙收發(fā)器,關(guān)斷后接收器保持有效
文件頁數(shù): 5/8頁
文件大?。?/td> 83K
代理商: MAX563
The inputs of unused drivers may be left unconnected
because they have internal 400k
pull-ups to V
CC
.
Unused inputs may also be connected to GND or V
CC
,
but V
CC
provides lower power consumption because of
the internal pull-ups.
EIA/T IA-562 and EIA/T IA-232 Rec eivers
The MAX563’s receivers convert ±3.7V to ±13.2V
EIA/TIA-562 signal levels into +3V logic levels; they are
rated to receive signals up to ±25V to accommodate
EIA/TIA-232 signals as well. Both receivers invert. Their
inputs are each equipped with an internal 5k
(nomi-
nal) terminating resistor connected to ground, and the
input logic thresholds are 0.4V and 2.4V. The positive
logic-low threshold (V
IL
) ensures the receiver outputs
remain high whenever their inputs are left open.
The receivers are active when
EN
is low, and have
high-impedance outputs when
EN
is high.
When
SHDN
is high, the receivers have hysteresis.
This produces clean output transitions, even with slow-
moving input signals that exhibit moderate amounts of
noise and ringing. When shut down, the receivers have
no hysteresis, and the propagation delay increases.
S hutdown and Enable Control
The
SHDN
and
EN
controls are independent. Both
receivers are always active when
EN
is low. With
EN
low and
SHDN
high, the receivers operate at full speed
and have hysteresis. When active in shutdown mode
(
EN
=
SHDN
= low), the receivers operate at reduced
power and speed, and without hysteresis.
The charge pumps and transmitters operate only when
SHDN
is high; they are unaffected by
EN
. When shut
down (
SHDN
= low) or unpowered (V
CC
= 0V), the
transmitter outputs are high impedance if they are
backdriven with voltages not exceeding ±15V. The pull-
up resistors at the driver inputs are disconnected in
shutdown mode to save power. During shutdown, V+ is
pulled down to V
CC
, and V- rises to GND.
_______________________________________________________________________________________
5
M
+3.3V-Powered, EIA/T IA-562 Dual Transc eiver
with Rec eivers Ac tive in S hutdown
V+
GND
MAX563
0.1μF
V
CC
0.1μF
R1 & R2
T1 & T2
0.1μF
C1+
C1-
C2+
C2-
V
CC
+3.6V
T
OUT
R
OUT
400k
5k
I
SHDN
0V +3.6V
DRIVE
0.1μF
0.1μF
3k
+3.6V
R
IN
T
IN
EN
SHDN
V-
+3.6V
V+
OV
V-
t
PHLT
OV
INPUT
OUTPUT
t
PLHT
+3V
INPUT
OUTPUT
50%
50%
+3V
50%
50%
GND
V
CC
t
PLHR
t
PLHS
t
PHLR
t
PHLS
0V
Figure 1. Shutdown Current Test Circuit
Figure 2. Transmitter Propagation Delay Timing
Figure 3. Receiver Propagation Delay Timing
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