MAX218 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 1.8V to 4.25V-Powered, True RS-232 Dual Transceiver

19-0246; Rev 1; 7/95
1.8V to 4.25V-Powered,
True RS-232 Dual Transceiver
_______________General Description
The MAX218 RS-232 transceiver is intended for battery-
powered 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 incor-
porating 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.
________________________Applications
Battery-Powered Equipment
Computers
Printers
Peripherals
Instruments
Modems
__________Typical Operating Circuit
____________________________Features
BETTER THAN BIPOLAR!
o Operates Directly from Two Alkaline, NiCd,
or NiMH Cells
o +1.8V to +4.25V Supply Voltage Range
o 120kbps Data Rate
o Low-Cost Surface-Mount Components
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
MAX218CPP
MAX218CWP
MAX218CAP
MAX218C/D
MAX218EPP
MAX218EWP
MAX218EAP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Plastic DIP
20 Wide SO
20 SSOP
Dice*
20 Plastic DIP
20 Wide SO
20 SSOP
*Contact factory for dice specifications.
__________________Pin Configuration
1.8V
TO
4.25V
ON/OFF
ENABLE
1
19
6 _VCC ^LX
V+
MAX218
3
SHDN
V- ¹⁵
C1+ ¹⁸
C1- ¹⁶
7 T1IN
T1
T1OUT 14
8 T2IN
T2
9 R1OUT
R1
T2OUT 13
R1IN 12
10 R2OUT
EN
4
R2
R2IN 11
GND
5, 17, 20
TOP VIEW
LX ₁
N.C. ₂
SHDN ₃
EN ₄
GND ₅
VCC 6
T1IN ₇
T2IN ₈
R1OUT ₉
R2OUT ₁₀
MAX218
20 ^GND
19 V+
18 C1+
17 GND
16 C1-
15 V-
14 T1OUT
13 T2OUT
12 R1IN
11 R2IN
DIP/SO/SSOP
________________________________________________________________ Maxim Integrated Products 1
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