MAX3218C/D MAXIM [Maxim Integrated Products], MAX3218C/D Datasheet

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MAX3218C/D

Manufacturer Part Number
MAX3218C/D
Description
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.MAX3218CD.pdf (12 pages)
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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MAX3218C/D Summary of contents

Page 1

... On-Board DC-DC Converters 20-Pin SSOP and DIP Packages ______________Ordering Information PART TEMP. RANGE MAX3218CPP 0°C to +70°C MAX3218CAP 0°C to +70°C MAX3218C/D 0°C to +70°C MAX3218EPP -40°C to +85°C MAX3218EAP -40°C to +85°C † Contact factory for dice specifications. __________________Pin Configuration TOP VIEW ...

Page 2

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ ABSOLUTE MAXIMUM RATINGS Supply Voltages V ....................................................................-0.3V to +4. .......................................................... (V V- .......................................................................+0.3V to -7. ..........................................................................+12V CC LX ................................................................-0.3V to (1V + V+) Input Voltages ...

Page 3

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1.8V to 4.25V 0.47µ 1µ 15µ Typical values are ...

Page 4

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ __________________________________________Typical Operating Characteristics (Circuit of Figure 1.8V, all transmitter outputs loaded with 3kΩ SUPPLY CURRENT vs. SUPPLY VOLTAGE 140 1 TRANSMITTER FULL DATA RATE 1 ...

Page 5

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ ______________________________________________________________Pin Description PIN NAME 1 LX Inductor/Diode Connection Point Output of Invalid Signal Detector. Low if invalid RS-232 levels are present on all receiver inputs, 2 INVALID otherwise high. 3 ...

Page 6

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ Table 1. Suggested Component Suppliers MANUFACTURER Inductors Murata-Erie LQH4N150K-TA Sumida CD43150 TDK NLC453232T-150K Diodes—Surface-Mount Allegro TMPD6050LT Central Semiconductor CMPSH-3 (Schottky) Motorola MMBD6050LT1 (silicon) Philips PMBD6050 (silicon) Diodes—Through-Hole 1N6050 (silicon), Motorola ...

Page 7

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ FORCEOFF FORCEON POWER MANAGEMENT INVALID UNIT OR KEYBOARD CONTROLLER MAX3218 I/O CHIP CPU WITH UART Figure 2. Interface Under Control of PMU The two drivers are identical, and deliver EIA/TIA-232E ...

Page 8

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ MAX3218 shuts down after sensing invalid RS-232 levels for greater than 30µs, ensuring that the AutoShutdown mode is not enabled for slow-moving signals (>1V/µs). Another system with AutoShutdown may need ...

Page 9

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ TRANSMITTERS ENABLED, INVALID HIGH +2.8V INDETERMINATE +0.3V AUTOSHUTDOWN, TRANSMITTERS DISABLED SUPPLY CURRENT, INVALID LOW -0.3V INDETERMINATE -2.8V TRANSMITTERS ENABLED, INVALID HIGH (a) RECEIVER INPUT VOLTAGE (V) V ...

Page 10

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ 3V DC-DC CONVERTER MAX878 OR MAX756 OR MAX856 Figure 6. Operating from Unregulated and Regulated Supplies 10 ______________________________________________________________________________________ 15 H 1N6050 ...

Page 11

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ _____+3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from Maxim SUPPLY PART VOLTAGE TRANSMITTERS/ (V) RECEIVERS MAX212 3.0 to 3.6 MAX3212 2.7 to 3.6 MAX218 1.8 to 4.25 MAX3218 1.8 to 4.25 MAX560 ...

Page 12

Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown™ ___________________Chip Topography INVALID LX GND FORCEON FORCEOFF GND V CC T1IN T2IN R1IN R2OUT R2IN R1OUT 0.122" (3.099mm) TRANSISTOR COUNT: 571 SUBSTRATE CONNECTED TO GND ________________________________________________________Package Information ...

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