19-0246; Rev 1; 7/95
1.8V to 4.25V-Powered,
True RS-232 Dual Transceiver
ON/OFF
3
SHDN
T1
o Meets EIA/TIA-232E Specifications
o 1µA Low-Power Shutdown Mode
o Both Receivers Active During Low-Power Shutdown
o Three-State Receiver Outputs
o Flow-Through Pinout
o On-Board DC-DC Converters
o 20-Pin SSOP, Wide SO, or DIP Packages
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX218CPP
0°C to +70°C
20 Plastic DIP
0°C to +70°C
20 Wide SO
0°C to +70°C
0°C to +70°C
-40°C to +85°C
20 SSOP
Dice*
20 Plastic DIP
-40°C to +85°C
-40°C to +85°C
20 Wide SO
20 SSOP
__________________Pin Configuration
LX 1
15
20 GND
N.C. 2
19 V+
C1+ 18
SHDN 3
18 C1+
16
EN 4
17 GND
T1OUT 14
GND 5
C1-
7 T1IN
o Low-Cost Surface-Mount Components
TOP VIEW
V-
MAX218
o 120kbps Data Rate
*Contact factory for dice specifications.
19
V+
VCC
o +1.8V to +4.25V Supply Voltage Range
MAX218EWP
MAX218EAP
__________Typical Operating Circuit
6
o Operates Directly from Two Alkaline, NiCd,
or NiMH Cells
MAX218CAP
MAX218C/D
MAX218EPP
Battery-Powered Equipment
Computers
Printers
Peripherals
Instruments
Modems
1
LX
BETTER THAN BIPOLAR!
MAX218CWP
________________________Applications
1.8V
TO
4.25V
____________________________Features
MAX218
16 C1-
VCC 6
8 T2IN
T2
9 R1OUT
R1
10 R2OUT
R2
EN
ENABLE
4
15 V-
T2OUT 13
T1IN 7
14 T1OUT
R1IN 12
T2IN 8
13 T2OUT
GND
5, 17, 20
12 R1IN
R2OUT 10
R2IN 11
R1OUT 9
11 R2IN
DIP/SO/SSOP
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
1
MAX218
_______________General Description
The MAX218 RS-232 transceiver is intended for batterypowered EIA/TIA-232E and V.28/V.24 communications
interfaces that need two drivers and two receivers with
minimum power consumption. It provides a wide +1.8V
to +4.25V operating voltage range while maintaining
true RS-232 and EIA/TIA-562 voltage levels. The
MAX218 runs from two alkaline, NiCd, or NiMH cells
without any form of voltage regulator.
A shutdown mode reduces current consumption to
1µA, extending battery life in portable systems. While
shut down, all receivers can remain active or can be
disabled under logic control, permitting a system incorporating the CMOS MAX218 to monitor external
devices while in low-power shutdown mode.
A guaranteed 120kbps data rate provides compatibility
with popular software for communicating with personal
computers. Three-state drivers are provided on all
receiver outputs so that multiple receivers, generally of
different interface standards, can be wire-ORed at the
UART. The MAX218 is available in 20-pin DIP, SO, and
SSOP packages.
