MAX212CAG+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX212CAG+ ,+3V-Powered, Low-Power, True RS-232 TransceiverFeaturesSUPERIOR TO BIPOLAR:The MAX212 RS-232 transceiver is intended for 3V-pow-ered EIA/TIA-232E ..
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MAX5237EUB ,Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACsApplications Buffered Output Drives 5kΩ || 100pFIndustrial Process ControlsAutomatic Test Equipmen ..

MAX212CAG+
+3V-Powered, Low-Power, True RS-232 Transceiver
________________General Description
The MAX212 RS-232 transceiver is intended for 3V-pow-
ered EIA/TIA-232E and V.28/V.24 communication inter-
faces where 3 drivers and 5 receivers are needed with
minimum power consumption. The operating voltage
range extends from 3.6V down to 3.0V while still main-
taining true RS-232 and EIA/TIA-562 voltage levels.
A 1μA typical shutdown mode reduces power con-
sumption, extending battery life in portable systems.
While shut down, all receivers can remain active or can
be disabled under logic control. This enables a system
incorporating the CMOS MAX212 to be in low-power
shutdown mode and monitor incoming RS-232 activity.
A guaranteed data rate of 120kbps provides compati-
bility with popular software for communicating with per-
sonal computers.
Three-state drivers on all receiver outputs are provided
so that multiple receivers, generally of different inter-
face standards, can be wire-ORed at the UART.
The MAX212 is available in both small-outline (SO) and
shrink-small-outline (SSOP) packages. The SSOP
package occupies less than half of the board area
required by the equivalent SO package.
________________________Applications
Computers
Notebooks/Palmtops/Subnotebooks
Printers
Peripherals
Instruments
____________________________Features
SUPERIOR TO BIPOLAR:Operates from Single +3.0V to +3.6V Supply24-Pin SSOP or Wide SO PackagesMeets All EIA/TIA-232E & EIA/TIA-562
Specifications3mA Max Supply Current (Unloaded)1μA Low-Power Shutdown ModeAll Receivers Active During Low-Power ShutdownMouse Compatible at 3.0VLow-Cost, Surface-Mount External Components120kbps Guaranteed Data Rate—LapLink™
CompatibleThree-State Receiver OutputsEvaluation Kit AvailableFlow-Through PinoutV-Powered, Low-Power,
True RS-232 Transceiver
________________________________________________________________Maxim Integrated Products1
Call toll free 1-800-998-8800 for free samples or literature.
PARTTEMP. RANGEPIN-PACKAGE
MAX212CWG0°C to +70°C24 Wide SO
MAX212CAG0°C to +70°C24 SSOP
MAX212C/D0°C to +70°CDice*
MAX212EAG-40°C to +85°C24 SSOP
MAX212EWG-40°C to +85°C24 Wide SO
EV KITTEMP. RANGEBOARD TYPE
MAX212EVKIT-SSOP0°C to +70°CSurface Mount
19-0162; Rev 2; 2/94
™LapLink is a registered trademark of Traveling Software.
_______________Ordering Information
* Dice are tested at TA= +25°C only.
___________Typical Operating Circuit
MAX212
T1IN
VCC
+3.3V
DC-DC CONVERTER
T1OUTLPV-V+
GND21423
SHUTDOWN
T2INT2OUTT21216
T3INT3OUTT31315
R1OUTR1IN622
R2OUTR2INR2721
R3OUTR3IN820R3
R4OUTR4IN919R4
R5OUTR5IN1018R524ENABLE
EVALUATION KIT
INFORMATION INCLUDED
V-Powered, Low-Power,True RS-232 Transceiver_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= 3.0V to 3.6V, TA= TMINto TMAX, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PARAMETERMINTYPMAXUNITS
Input Logic Threshold LowVCC / 3V15μA
Shutdown Supply Current115μA
Input Logic Threshold High2VCC / 3V
Input Current High1μA
Input Current Low1μA
Hysteresis0.3V
Operating Voltage Range3.03.6V
VCCSupply Current1.53.0mA
Logic Output Voltage Low0.25V
Logic Output Voltage HighVCC - 0.5V
Logic Output Leakage Current±10μA
-25+25V
EIA/TIA-232E Input Hysteresis0.7V
EIA/TIA-232E Input Resistance357kΩ
±5.0±5.5V
Output Resistance300Ω100mA
CONDITIONS
IOUT= 1.0mA
T_IN, EN, –S—D; VCC= 3.0V to 3.6V
IOUT= -1.0mAS—D= GND, EN = VCC, R_IN= GND or VCCS—D= EN = GND, R_IN= GND or VCC
T_IN, EN, –S—D; VCC= 3.0V to 3.6V
T_IN, EN, –S—D; VIN= VCC
EN = GND, 0V < R_OUT< VCC
T_IN, EN, –S—D, VIN= GND
T_IN; VCC = 3.3V
-15V < VIN< 15V
Meets or exceeds EIA/TIA-232E specifications
All transmitters loaded 3kΩto GND
VCC= V- = V+ = 0V, -2V < T_OUT< 2V
No load, VCC= 3.3V
Supply Voltages
VCC.....................................................................-0.3V to +4.6V
V+............................................................(VCC- 0.3V) to +7.4V
V-........................................................................-7.4V to +2.0V
LN..............................................................-0.3V to (V+ + 1.0V)
LP.......................................................(V- - 1.0V) to (V+ + 0.3V)
Input Voltages
T_IN, –S—D, EN..............................................-0.3V to (V+ + 0.3V)
R_IN...................................................................................±25V
Output Voltages
T_OUT................................................................................±15V
R_OUT........................................................-0.3V to (V+ + 0.3V)
Short-Circuit Duration, T_OUT.....................................Continuous
Continuous Power Dissipation (TA= +70°C)
Wide SO (derate 11.76mW/°C above +70°C)...............941mW
SSOP (derate 8.00mW/°C above +70°C).....................640mW
Lead Temperature (soldering, 10sec).............................+300°C
Shutdown Supply Current with
Receivers Active
EIA/TIA-232E Input Voltage
Operating Range
EIA/TIA-232E Input Voltage
Threshold Low0.4V
EIA/TIA-232E Input Voltage
Threshold High2.8V
Output Voltage Swing (VHIGH, VLOW)
EIA/TIA-232E Short-Circuit Current
DC CHARACTERISTICS
LOGIC
EIA/TIA-232E RECEIVERS
EIA/TIA-232E TRANSMITTERS
V-Powered, Low-Power,True RS-232 Transceiver
_______________________________________________________________________________________3
TIMING CHARACTERISTICS
(VCC= 3.0V to 3.6V, TA= TMINto TMAX, unless otherwise noted.)
PARAMETERMINTYPMAXUNITS
Transmitter Output Disable Time600ns
250μs
Receiver Output Enable Time70200ns
Receiver Output Disable Time420700ns
CONDITIONS
Includes power-supply start-up
Receiver Propagation Delay300700ns150pF load
8002000Transmitter Propagation Delay8002000ns2500pF3kΩload
SYMBOL
tPLHR
tPHLT
tPLHT
tDT
tPHLR
tET
tER
tDR
Transmitter Output Enable Time
4.01030V/μsRL= 3kΩto 7kΩ, CL= 50pF to 2500pF,
measured from +3V to -3V or -3V to +3VTransition-Region Slew Rate
__________________________________________Typical Operating Characteristics
(VCC= 3.3V, TA = +25°C, unless otherwise noted.)204060
DATA RATE (kbps)
(m
160SUPPLY POWER vs.
DATA RATE
212 GR
2500pF
1000pF
2500pF
ALL TRANSMITTERS
LOADED w/ 3kW AND
STATED CAPACITANCE
1000pF
3 TRANSMITTERS
AT DATA RATE
3 TRANSMITTERS,
1 AT DATA RATE,
1 LOW, 1 HIGH50100150
DATA RATE (kbps)
(VTRANSMITTER OUTPUT VOLTAGE vs.
DATA RATE
212 GR
5000pF
4000pF
2500pF
1000pF
4000pF
2500pF
1000pF
5000pF
ALL TRANSMITTERS
LOADED SIMULTANEOUSLY
w/ SPECIFIED CAPACITANCE AND 3kW
Data Rate120250kbps1000pF 3kΩload on each transmitter,
150pF load on each receiver
V-Powered, Low-Power,True RS-232 Transceiver_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(VCC= 3.3V, TA = +25°C, unless otherwise noted.)
LOAD CAPACITANCE (pF)
(V
SLEW RATE vs.
LOAD CAPACITANCE
212 GR
4500
RISING EDGE
ALL TRANSMITTERS
LOADED SIMULTANEOUSLY
w/ SPECIFIED CAPACITANCE AND 3kW
FALLING EDGE
NAMEFUNCTION
VCCSupply Voltage Input, 3.0V to 3.6VS—D
R1OUT-
R5OUT
Receiver Outputs, swing GND
to VCC
T1IN-T3INTransmitter Inputs
Transmitter Outputs
R5IN-R1INReceiver Inputs
_____________________Pin Description
PIN
T3OUT-
T1OUTPositive Supply generated on-board23
GNDGround2414
Inductor/Diode Connection Point
Inductor/Diode Connection Point
Shutdown Control. Connect to VCC
for normal operation. Connect to
GND to shut down the power supply
and to disable the drivers. Receiver
status is not changed by this control.
Receiver Enable Control. Connect
to VCCfor normal operation.
Connect to GND to force the
receiver outputs into a high-Z state.
Negative Supply generated on-board
_______________Detailed Description
The MAX212 line driver/receiver is intended for 3V-
powered EIA/TIA-232E and V.28/V.24 communications
interfaces where 3 drivers and 5 receivers are
required. The operating voltage range extends from
3.6V down to 3.0V while still maintaining true RS-232
and EIA/TIA-562 transmitter output voltage levels.
The circuit comprises three sections: power supply,
transmitters, and receivers. The power-supply sec-
tion converts the supplied 3V to about ±6.5V, to pro-
vide the voltages necessary for the drivers to meet
true RS-232 levels. External components are small
and inexpensive.
The transmitters and receivers are guaranteed to oper-
ate at data rates of 120kbps.
A shutdown mode reduces current to 1μA to extend
battery life in portable systems. While shut down, all
receivers can remain active or can be disabled under
logic control. This enables a system incorporating the
MAX212 to be in low-power shutdown mode and still
monitor incoming RS-232 activity.
Three-state drivers on all receiver outputs are provided
so that multiple receivers, generally of different inter-
face standards, can be wire-ORed at the UART.
SUPPLY VOLTAGE (V)
(m
SUPPLY POWER vs.
SUPPLY VOLTAGE
212 G
120kbps
ALL TRANSMITTERS
AT SPECIFIED DATA RATES
w/ 2500pF AND 3kW LOADS
64kbps
20kbps100020003000LOAD CAPACITANCE (pF)
(mSUPPLY CURRENT vs.
LOAD CAPACITANCE
212 G
120kbps
64kbps
20kbps
ALL TRANSMITTERS
AT SPECIFIED CAPACITANCE AND
DATA RATES w/ 3kW LOADS
V-Powered, Low-Power,True RS-232 Transceiver
_______________________________________________________________________________________5
Switch-Mode Power Supply
The switch-mode power supply uses a single inductor
with two inexpensive diodes and two capacitors to
generate ±6.5V from the 3.0V to 3.6V input. Figure 1
shows the complete circuit for the power supply.
Use a 15mH inductor with a saturation current rating of at
least 350mA and under 1Wresistance. Sample surface-
mount inductors are available from Maxim. Use 1N6050
diodes or equivalent. Surface-mount equivalents for the
1N6050 include the Motorola MMBD6050LT1, Philips
PMBD6050, and Allegro (formerly Sprague) TMPD6050LT.
For C1 and C2, use ceramic capacitors with values no
less than indicated in Figure 1. These capacitors deter-
mine the ripple on V+ and V-, but not the absolute volt-
ages. Bypass VCCto GND with at least 0.33mF close to
the MAX212. Increase this to 4.7mF if there are no other
VCCsupply bypass components less than 6 inches
(15cm) away from the MAX212.
Component suppliers are listed in Table 1.
RS-232 Drivers
All three drivers are identical and deliver EIA/TIA-232E
and EIA/TIA-562 output voltage levels when VCCis
between 3.0V and 3.6V. Disable the drivers by taking
the –S—Dpin to GND. The transmitter outputs are forced
into a high-impedance state when –S—Dis grounded.
RS-232 Receivers
All five receivers are identical and accept
EIA/TIA-232E and EIA/TIA-562 input signals. The CMOS
receiver outputs swing rail-to-rail (0V to VCC). When EN
is high, the receivers are active regardless of –S—D’sstatus.
When EN is low, the receivers’ outputs are put into a
high-impedance state. This allows two RS-232 ports (or
two parts of different types) to be wire-ORed at the UART.
MAX212
T1IN
VCC
+3.3V
+3.3V TO ±6.5V
DC-DC CONVERTER
T1OUTLPV-V+
GND
15mH
D1
1N605021423
C2
0.33mFC1
0.68mF
C3
0.33mF
D2
1N6050
SHUTDOWN
T2INT2OUTT21216
T3INT3OUT1315
R1OUTR1IN622
R2OUTR2INR2721
R3OUTR3IN820R3
R4OUTR4IN919R4
R5OUTR5IN1018R524
ENABLE
Figure 1. Typical Application Circuit
Table 1. Suggested Component Suppliers
MANUFACTURERPART NUMBERPHONE NUMBERFAX NUMBER
AllegroTMPD6050LTUSA (508) 853-5049
MotorolaMMBD6050LT1USA (408) 991-7420
MurataLQH4N150K-TA
PhilipsPMBD6050USA (401) 762-3800USA (401) 767-4493
SumidaCD43150USA (708) 956-0666
Japan (03) 3607-5111
TDKNLC453232T-150KUSA (708) 803-6296
Japan (03) 3278-5358
USA (508) 853-5000
USA (408) 749-0510
USA (404) 831-9172
Japan (075) 951-9111
USA (404) 436-3030
Japan (075) 955-6526
USA (708) 956-0702
Japan (03) 3607-5428
USA (708) 803-6100
Japan (03) 3278-5111
V-Powered, Low-Power,True RS-232 Transceiver_______________________________________________________________________________________
Operating Modes–S—Dand EN determine the operation of the MAX212 follows:
Shutdown
V+ and V- are disabled and the transmitters are put into
a high-impedance state when –S—Dis taken to logic low.
Receiver operation is not affected, but power consump-
tion is dramatically reduced while in shutdown mode.
Supply current is minimized when the receiver inputs are
static in any of three states: floating (ground), less than
GND, or greater than VCC. This will be true for all static
RS-232 conditions. The presence of AC signals on receiv-
er inputs will increase VCCcurrent in shutdown.
From a low-power system perspective, powering-up with
non-critical or unused sections of circuitry shut down or
deselected is generally recommended. Activating these
sections only when required saves power and reduces
power-up current surges. Powering-up the MAX212 in
shutdown mode (holding the shutdown pin, –S—D, low until VCC> 2.7V), helps to achieve this.
Driving the MAX212 from 5V Logic
The MAX212 can interface with 5V logic while it operates
from a 3V supply, however a 200kΩseries resistor between–S—Dand the +5V logic signal is required (see Figure 2).
This protects the MAX212 by preventing –S—Dfrom sinking
current while V+ is powering up. Also, the UART must not
be permitted to send a logic high to the MAX212’s EN or
transmitter input pins until –S—Dis high (not shut down).
Mouse Driveability
The MAX212 has been specifically designed to power
serial mice while operating from low-voltage power
supplies. It has been tested with samples of ten major
mouse models from six manufacturers, including the
leading three, Logitech (5 models), Mouse Systems,
and Microsoft. The MAX212 successfully drove all seri-
al mice and met their respective current and voltage
requirements (Figure 1).
Figure 3 shows the transmitter output voltages under
increasing load current. The MAX212’s switching regu-
lator ensures the transmitters will supply at least ±5V
during worst-case load conditions.
EIA/TIA-232E and 562 Standards
Most of the power drawn by RS-232 circuits is con-
sumed because the EIA/TIA-232E standard demands
that at least ±5V be delivered by the transmitters to
impedances that can be as low as 3kΩ. For applica-S—DENRECEIVER
OUTPUTS
DRIVER
OUTPUTSLHigh-ZHigh-ZOffMinimumHEnabledHigh-ZOffMinimumLHigh-ZEnabledOnNormalHEnabledEnabledOnNormal
SUPPLY
CURRENT
PART
No. OF
TRANSMITTERS/
RECEIVERS
DATA RATE
(kbps)FEATURES
MAX2123.0 to 3.63/55250True RS-232 from +3V
MAX5603.0 to 3.64/521202 receivers active in shutdown
MAX5613.0 to 3.64/50120Pin compatible with MAX241
MAX5622.7 to 5.253/55250Wide supply range
POWER-SUPPLY
VOLTAGE
(V)
No. OF
RECEIVERS
ACTIVE IN
SHUTDOWN
____________________________+3V Powered RS-232 Transceivers from Maxim
DC-DC
CONVERTER
MAX212
T_IN
+3.3V
DC-DC CONVERTER
R_OUTR_IN
T_OUTLPV-
GND
+5V
LOGIC
SIGNALS
200k
Figure 2. Connecting to +5V Logic

Partno	Mfg	Dc	Qty	Available	Descript
MAX212CAG+ \|MAX212CAG	MAX	N/a	31	avai	+3V-Powered, Low-Power, True RS-232 Transceiver