19-0198; Rev 0; 10/93
+3 .3 V-P o w e re d , EIA/TIA-5 6 2 Du a l Tra n s c e ive r
w it h Re c e ive rs Ac t ive in S h u t d o w n
MAX563
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ Guaranteed Interoperability with RS-232
♦ Operates from a Single +3.0V to +3.6V Supply
♦ 2 Drivers, 2 Receivers
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.
♦ Receivers Active in Shutdown Mode
♦ Low-Power Shutdown: 10µA Max
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.
♦ Small Package—18-Pin Wide SO
♦ Three-State TTL/CMOS Receiver Outputs
♦ 116kbps Guaranteed Data Rate
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.
______________Ord e rin g In fo rm a t io n
PART
MAX563CPN
MAX563CWN
MAX563C/D
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
18 Plastic DIP
18 Wide SO
Dice *
________________________Ap p lic a t io n s
Handiterminals
Battery-Powered Equipment
Bar-Code Readers
* Dice are specified at T = +25°C.
A
Notebook and Palmtop Computers
__________Typ ic a l Op e ra t in g Circ u it
__________________P in Co n fig u ra t io n
+3.3V
C3
ALL CAPACITORS 0.1µF
+6.6V
17
TOP VIEW
3
2
V
C1+
CC
V+
C1
C2
VOLTAGE DOUBLER
4
5
C1-
EN
C1+
V+
1
2
18 SHDN
17
-6.6V
C4
C2+
7
V
CC
VOLTAGE INVERTER V-
6
C2-
3
4
16 GND
15 T1
V
CC
C1-
C2+
C2-
V-
OUT
400k
MAX563
T1
12 T1
15
OUT
IN
5
6
7
8
9
14 R1
13 R1
IN
OUT
IN
CMOS
INPUTS
RS-562
OUTPUTS
V
CC
400k
11
T2
IN
T2
8
OUT
12 T1
11 T2
T2
OUT
IN
13 R1
14
R1
IN
OUT
R2
IN
10 R2
OUT
5k
5k
RS-562/RS-232
INPUTS
CMOS
OUTPUTS
10
1
R2
R2
IN
9
OUT
DIP/SO
18
SHDN
ON/OFF
EN
GND
™ LapLink is a registered trademark of Traveling Software, Inc.
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .