MAX3212CWI-T Maxim Integrated, MAX3212CWI-T Datasheet

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MAX3212CWI-T

Manufacturer Part Number
MAX3212CWI-T
Description
RS-232 Interface IC
Manufacturer
Maxim Integrated
Series
MAX3212r
Datasheet
1.MAX3212CWI-T.pdf (12 pages)

Specifications of MAX3212CWI-T

Data Rate
235 Kbps
Operating Supply Voltage
2.7 V to 3.6 V
Supply Current
3 mA
Operating Temperature Range
0 C to + 70 C
Function
Transceiver
Number Of Drivers
3
Number Of I/os
17
Number Of Receivers
5
Propagation Delay Time Ns
2 us
Shutdown
Yes
The MAX3212 uses Maxim’s new proprietary Auto-
Shutdown mode to reduce supply current to 1µA. The
MAX3212, with 3 RS-232 drivers and 5 RS-232 receivers,
is intended for 2.7V to 3.6V-powered EIA/TIA-232E and
V.28/V.24 serial interface. True RS-232 levels are main-
tained across the operating range. A guaranteed data
rate of 235kbps provides compatibility with popular soft-
ware for communicating with personal computers.
Supply current is reduced to 1 µA with Maxim’s new
AutoShutdown feature. When the MAX3212 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 transmit-
ters of the connected peripheral are turned off. The sys-
tem turns on again when a valid level is applied to any
RS-232 receiver input. As a result, the system saves
power without changes to the existing software.
A second power-management feature is incorporated to
permit automatic shutdown when the RS-232 connection
is valid but inactive. In this case, a transition detector
facilitates shutdown when the receivers are presented
with stationary RS-232 levels for long periods.
Three-state drivers are provided on receiver outputs so
that multiple receivers, generally of different interface
standards, can be wire-ORed at the UART. The
MAX3212 is available in 28-pin SO and SSOP packages.
________________________Applications
19-0312; Rev 0; 9/94
Pin Configuration appears at end of data sheet.
* ng
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
______________Ordering Information
MAX3212CWI
MAX3212CAI
MAX3212EWI
MAX3212EAI
PART
Notebook and Palmtop Computers
Peripherals
Instruments
Battery-Powered Equipment
+2.7V to +3.6V-Powered, 1µA Supply Current,
3-Driver/5-Receiver, True RS-232 Transceiver
________________________________________________________________ Maxim Integrated Products
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
PIN-PACKAGE
BETTER THAN BIPOLAR!
____________________________Features
__________Typical Operating Circuit
1µA Supply Current Using AutoShutdown
Operates from Single +2.7V to +3.6V Supply
28-Pin SSOP or Wide SO Packages
Meets All EIA/TIA-232E & EIA/TIA-562 Specifications
Mouse Driveability–Guaranteed
Low-Cost, Surface-Mount External Components
235kbps Guaranteed Data Rate–
LapLink™ Compatible
+5V Logic Compatible
Complementary Receiver Output Always Active
Flow-Through Pinout
+3.0V
0.33µF
+3.0V
+3.0V
26
15
10
11
12
25
13
14
5
6
8
9
7
FORCEOFF = HIGH, FORCEON = LOW
RS-232 Present
3
V
T1IN
T2IN
T3IN
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
R5OUTB
FORCEON
FORCEOFF
TRAN
INVALID
0.68µF 1N6050
AUTOSHUTDOWN OPERATION
CC
27
Yes
No
V+
EN
4
1
LN
MAX3212
28
T1
T2
T3
GND
R1
R2
R3
R4
R5
R5
15µH
Shut Down
Status
2
LP
1N6050
5k
5k
5k
5k
5k
On
T1OUT
T2OUT
T3OUT
16
R1IN
R2IN
R3IN
R4IN
R5IN
V-
18
17
24
22
20
19
23
21
0.33µF
1

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MAX3212CWI-T Summary of contents

Page 1

... MAX3212 is available in 28-pin SO and SSOP packages. ________________________Applications Notebook and Palmtop Computers Peripherals Instruments Battery-Powered Equipment ______________Ordering Information PART TEMP. RANGE MAX3212CWI 0°C to +70°C MAX3212CAI 0°C to +70°C MAX3212EWI -40°C to +85°C MAX3212EAI -40°C to +85°C Pin Configuration appears at end of data sheet. ...

Page 2

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver ABSOLUTE MAXIMUM RATINGS Supply Voltages V .....................................................................-0.3V to +4. ............................................................(V V- ........................................................................-7.4V to +2.0V LN ..............................................................-0.3V to (V+ + 1.0V) LP.......................................................(V- - 1.0V) to (V+ + 0.3V) Input ...

Page 3

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver ELECTRICAL CHARACTERISTICS (continued 2.7V to 3.6V MIN MAX CC PARAMETER EIA/TIA-232E RECEIVERS Input Voltage Operating Range Input Voltage Threshold Low Input Voltage ...

Page 4

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver __________________________________________Typical Operating Characteristics (V = 3.3V +25°C, unless otherwise noted TRANSMITTING SUPPLY CURRENT vs. DATA RATE TRANSMITTERS LOADED WITH 3k + ...

Page 5

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver ______________________________________________________________Pin Description PIN NAME TRAN 6 INVALID 7 R5OUTB 8–12 R1OUT–R5OUT 13, 14, 15 T1IN, T2IN, T3IN 16 V- 17, ...

Page 6

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver not the absolute voltages. Increasing the size of C1 and C2 increases the time V+ and V- take to reach their final value. Bypass V to GND with at least ...

Page 7

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver FORCEOFF FORCEON POWER MANAGEMENT INVALID UNIT OR KEYBOARD CONTROLLER MAX3212 I/O CHIP CPU WITH UART Figure 1. Interface Under Control of PMU A 1µA supply current is achieved with Maxim’s ...

Page 8

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver +0.3V to +3. -0.3V to -3.0V - RIN_ Rx ROUT_ EN • • • INVALID IS AN INTERNALLY GENERATED SIGNAL THAT IS USED BY THE AUTOSHUTDOWN LOGIC ...

Page 9

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver TRANSMITTERS ENABLED, INVALID HIGH +3.0V INDETERMINATE +0.3V AUTOSHUTDOWN, TRANSMITTERS DISABLED SUPPLY CURRENT, INVALID LOW -0.3V INDETERMINATE -3.0V TRANSMITTERS ENABLED, INVALID HIGH (a) RECEIVER INPUT VOLTAGE (V) V ...

Page 10

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver TRANSMITTER OUTPUT VOLTAGE vs. LOAD CURRENT PER TRANSMITTER 7 T1OUT AND T2OUT 2.7V CC T1IN AND T2IN = GND -1 T3IN = V CC T3OUT, ...

Page 11

Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver __________________Pin Configuration TOP VIEW TRAN 5 MAX3212 INVALID 6 R5OUTB 7 R1OUT 8 R2OUT 9 R3OUT 10 R4OUT 11 R5OUT 12 ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1994 Maxim Integrated Products ...

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