Datasheet

_______________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
____________________________Features
♦ Guaranteed Interoperability with RS-232
♦ Operates from a Single +3.0V to +3.6V Supply
♦ 2 Drivers, 2 Receivers
♦ Receivers Active in Shutdown Mode
♦ Low-Power Shutdown: 10µA Max
♦ Small Package—18-Pin Wide SO
♦ Three-State TTL/CMOS Receiver Outputs
♦ 116kbps Guaranteed Data Rate
______________Ordering Information
MAX563
+3.3V-Powered, EIA/TIA-562 Dual Transceiver
with Receivers Active in Shutdown
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
C1+
V+
C1-
C2+
C2-
V-
T2
OUT
R2
IN
V
CC
GND
T1
OUT
R1
IN
R1
OUT
T1
IN
T2
IN
R2
OUT
MAX563
DIP/SO
TOP VIEW
EN
SHDN
__________________Pin Configuration
V+
GND
V
CC
+3.3V
C1-
V
CC
ALL CAPACITORS 0.1µF
5k
V-
5k
VOLTAGE DOUBLER
VOLTAGE INVERTER
CMOS
INPUTS
CMOS
OUTPUTS
1
10
13
11
12
6
5
4
2
3
7
15
8
14
9
18
RS-562/RS-232
INPUTS
RS-562
OUTPUTS
C1+
C2+
C2-
V
CC
C3
R2
IN
R1
IN
T2
OUT
T1
OUT
T1
IN
T2
IN
R1
OUT
R2
OUT
EN
400k
400k
SHDN
+6.6V
-6.6V
C4
17
C1
C2
ON/OFF
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0198; Rev 0; 10/93
PART TEMP. RANGE PIN-PACKAGE
MAX563CPN 0°C to +70°C 18 Plastic DIP
MAX563CWN 0°C to +70°C 18 Wide SO
MAX563C/D 0°C to +70°C Dice *
™ LapLink is a registered trademark of Traveling Software, Inc.
* Dice are specified at T
A
= +25°C.