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PDF MAX563 Data sheet ( Hoja de datos )
| Número de pieza | MAX563 | |
| Descripción | +3.3V-Powered / EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX563 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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19-0198; Rev 0; 10/93
+3.3V-Powered, EIA/TIA-562 Dual Transceiver
with Receivers Active in Shutdown
_______________General Description
The MAX563 is a +3.3V-powered EIA/TIA-562 transceiver
with two transmitters and two receivers. Because it imple-
ments the EIA/TIA-562 standard, the MAX563 communi-
cates with RS-232 transceivers, yet consumes far less
power; this makes it ideal for battery-powered, hand-held
computers. And, the MAX563 guarantees a 116kbps data
rate while maintaining ±3.7V EIA/TIA-562 signal levels,
which makes it compatible with LapLink™ software.
An on-board charge pump converts the +3.3V supply to
the ±6.6V needed to produce the EIA/TIA-562 output volt-
age levels. Four 0.1µF charge-pump capacitors and a
bypass capacitor of similar size are the only external com-
ponents required.
When the MAX563’s charge pumps and transmitters are
shut down to save power, the receivers remain active to
continuously monitor signals from external devices (for
example, ring indicator from modems). The two receivers’
outputs can be enabled and disabled independently of the
shutdown function to allow two ports—generally of different
types—to be wire-OR connected at the UART.
________________________Applications
Handiterminals
Battery-Powered Equipment
Bar-Code Readers
Notebook and Palmtop Computers
__________Typical Operating Circuit
C1
C2
CMOS
INPUTS
CMOS
OUTPUTS
+3.3V
C3
ALL CAPACITORS 0.1µF
2 C1+
17 +6.6V
VCC V+ 3
4 C1- VOLTAGE DOUBLER
5 C2+
6 VOLTAGE INVERTER
C2-
7
V-
-6.6V
C4
400k VCC
12 T1IN
400k VCC
11 T2IN
T1OUT 15
T2OUT 8
RS-562
OUTPUTS
13 R1OUT
10 R2OUT
1 EN
R1IN 14
5k
R2IN 9
5k SHDN 18
GND
RS-562/RS-232
INPUTS
ON/OFF
____________________________Features
o Guaranteed Interoperability with RS-232
o Operates from a Single +3.0V to +3.6V Supply
o 2 Drivers, 2 Receivers
o Receivers Active in Shutdown Mode
o Low-Power Shutdown: 10µA Max
o Small Package—18-Pin Wide SO
o Three-State TTL/CMOS Receiver Outputs
o 116kbps Guaranteed Data Rate
______________Ordering Information
PART
MAX563CPN
MAX563CWN
MAX563C/D
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
* Dice are specified at TA = +25°C.
PIN-PACKAGE
18 Plastic DIP
18 Wide SO
Dice *
__________________Pin Configuration
TOP VIEW
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2OUT 8
R2IN 9
MAX563
18 SHDN
17 VCC
16 GND
15 T1OUT
14 R1IN
13 R1OUT
12 T1IN
11 T2IN
10 R2OUT
DIP/SO
™ LapLink is a registered trademark of Traveling Software, Inc.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
1 page  
+3.3V-Powered, EIA/TIA-562 Dual Transceiver
with Receivers Active in Shutdown
+3.6V
0.1µF
ISHDN
0.1µF
0.1µF
0.1µF
+3.6V
0V +3.6V
DRIVE
C1+ VCC V+
C1-
MAX563
C2+ VCC
C2- 400k
V-
0.1µF
T1 & T2
TIN TOUT
R1 & R2
ROUT
EN
SHDN
GND
RIN
+3.6V
5k
3k
Figure 1. Shutdown Current Test Circuit
The inputs of unused drivers may be left unconnected
because they have internal 400kΩ pull-ups to VCC.
Unused inputs may also be connected to GND or VCC,
but VCC provides lower power consumption because of
the internal pull-ups.
EIA/TIA-562 and EIA/TIA-232 Receivers
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 5kΩ (nomi-
nal) terminating resistor connected to ground, and the
input logic thresholds are 0.4V and 2.4V. The positive
logic-low threshold (VIL) 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.
Shutdown 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
+3V
INPUT
OUTPUT
tPLHT
OV
V+
OV
V-
tPHLT
Figure 2. Transmitter Propagation Delay Timing
INPUT
+3V
50%
50%
0V
OUTPUT
tPHLR
tPHLS
50%
VCC
50%
GND
tPLHR
tPLHS
Figure 3. Receiver Propagation Delay Timing
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 (VCC = 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 VCC, and V- rises to GND.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX563.PDF ] | |
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