MAX563 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – +3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown

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 T1_IN
400k ^VCC
11 T2_IN
T1_OUT 15
T2_OUT 8
RS-562
OUTPUTS
13 R1_OUT
10 R2_OUT
1 EN
R1_IN 14
5k
R2_IN 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 T_A = +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
T2_OUT 8
R2_IN 9
MAX563
18 SHDN
17 V_CC
16 GND
15 T1_OUT
14 R1_IN
13 R1_OUT
12 T1_IN
11 T2_IN
10 R2_OUT
DIP/SO
™ LapLink is a registered trademark of Traveling Software, Inc.
________________________________________________________________ Maxim Integrated Products 1
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