MAX3218 Maxim, MAX3218 Datasheet
MAX3218
Manufacturer Part Number
MAX3218
Description
1A Supply Current / 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown
Manufacturer
Maxim
Datasheet
1.MAX3218.pdf
(12 pages)
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The MAX3218 RS-232 transceiver is intended for bat-
tery-powered EIA/TIA-232E and V.28/V.24 communica-
tions interfaces that need two drivers and two receivers
with minimum power consumption from a single low-
voltage supply. It provides a wide +1.8V to +4.25V
operating voltage range while maintaining true RS-232
and EIA/TIA-562 voltage levels. The MAX3218 runs
from two alkaline, NiCd, or NiMH cells without any form
of voltage regulator. A guaranteed 120kbps data rate
provides compatibility with popular software for com-
municating with personal computers.
Supply current is reduced to 1µA with Maxim’s new
AutoShutdown™ feature. When the MAX3218 does not
sense a valid signal level on the receiver inputs, the on-
board power-supply and drivers shut down. This
occurs if the RS-232 cable is disconnected or if the
transmitters of the connected peripheral are turned off.
The system turns on again when a valid level is applied
to either RS-232 receiver input. As a result, the system
saves power without changes to the existing software.
Additionally, the MAX3218 can be forced into or out of
shutdown, under logic control.
While shut down, all receivers can remain active or can
be disabled under logic control, permitting a system
incorporating the CMOS MAX3218 to monitor external
devices while in low-power shutdown. Three-state dri-
vers are provided on both receiver outputs so that multi-
ple receivers, generally of different interface standards,
can be on the same bus. The MAX3218 is available in
20-pin DIP and SSOP packages.
________________________Applications
19-0380; Rev 0; 3/95
* Patent Pending
™ AutoShutdown is a trademark of Maxim Integrated Products.
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
Battery-Powered Equipment
Subnotebook Computers
PDAs
Hand-Held Equipment
Peripherals
Cellular Phones
1µA Supply Current, 1.8V to 4.25V-Powered
RS-232 Transceiver with AutoShutdown™
________________________________________________________________ Maxim Integrated Products
BETTER THAN BIPOLAR!
† Contact factory for dice specifications.
____________________________Features
__________________Pin Configuration
______________Ordering Information
MAX3218CPP
MAX3218CAP
MAX3218C/D
MAX3218EPP
MAX3218EAP
1µA Supply Current Using AutoShutdown™
Operates Directly from Two Alkaline,
NiCd or NiMH Cells
+1.8V to +4.25V Single-Supply Voltage Range
120kbps Data Rate Guaranteed
Low-Cost Surface-Mount Components
Meets EIA/TIA-232E Specifications
Three-State Receiver Outputs
Flow-Through Pinout
On-Board DC-DC Converters
20-Pin SSOP and DIP Packages
TOP VIEW
PART
FORCEOFF
FORCEON
INVALID
R1OUT
R2OUT
GND
T1IN
T2IN
V
LX
CC
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
10
0°C to +70°C
0°C to +70°C
0°C to +70°C
1
2
3
4
5
6
7
8
9
DIP/SSOP
MAX3218
20
19
18
17
16
15
14
13
12
11
20 Plastic DIP
20 SSOP
Dice
20 Plastic DIP
20 SSOP
PIN-PACKAGE
GND
V+
C1+
GND
C1-
V-
T2OUT
R1IN
R2IN
T1OUT
†
1
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