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MAX214CWIPHN/a43avaiProgrammable DTE/DCE, +5V RS-232 Transceiver
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MAX214EPI ,Programmable DTE/DCE, +5V RS-232 TransceiverGeneral Description ________
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MAX214CPI-MAX214CWI-MAX214EPI
Programmable DTE/DCE, +5V RS-232 Transceiver
_______________General Description
The MAX214 +5V RS-232 transceiver provides a com-
plete, 8-line, software-configurable, DTE or DCE port
RS-232 interface. Tx, Rx, RTS, CTS, DTR, DSR, DCD,
and RI circuits can be configured as either Data
Terminal Equipment (DTE) or Data Circuit-Terminating
Equipment (DCE) using the DTE/DCE control pin. The
MAX214 eliminates the need to swap cables when
switching between DTE and DCE configurations.
________________________Applications

AT-Compatible Laptop Computers
AT-Compatible Desktop Computers
Modems, Printers, and Other Peripherals
____________________________Features
Eliminates Null Modem CablesProgrammable DTE or DCE Serial Port1µF Charge-Pump Capacitors 116kbps Data Rate—Guaranteed20µA Shutdown ModeReceivers Active in Shutdown
______________Ordering Information

* Dice are specified at TA = +25°C.
MAX214
Programmable DTE/DCE,
+5V RS-232 Transceiver
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.

19-0199; Rev 1; 8/95
MAX214
Programmable DTE/DCE,
+5V RS-232 Transceiver_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS

VCC...........................................................................-0.3V to +6V
Input Voltages
TIN, DTE/DCE, SHDN HI-Z......................-0.3V to (VCC+ 0.3V)
RIN....................................................................................±15V
Output Voltages:
TOUT..................................................................................±15V
ROUT........................................................-0.3V to (VCC+ 0.3V)
Short-Circuit (one output at a time)
TOUTto GND...........................................................Continuous
ROUTto GND...........................................................Continuous
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C).............727mW
Wide SO (derate 12.50mW/°C above +70°C)............1000mW
Operating Temperature Ranges:
MAX214C–I..............................................0°C to +70°C
MAX214E–I..........................................-40°C to +85°C
Storage Temperature Range......................-65°C to +150°C
Lead Temperature (soldering, 10sec).......................+300°C
ELECTRICAL CHARACTERISTICS

(VCC= 4.5V to 5.5V, C1 to C4 = 1mF, TA= TMIN to 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.
MAX214
Programmable DTE/DCE,
+5V RS-232 Transceiver
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS (continued)

(VCC= 4.5V to 5.5V, C1 to C4 = 1mF, TA= TMIN to TMAX, unless otherwise noted.)
Note 1:
The 300Wminimum is the EIA/TIA-232E specification, but the actual resistance when in shutdown mode or when VCC= 0V
is typically 300kW.
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. VCC POSITIVE SUPPLY VOLTAGE

(V)
VCC (V)
MAX214-03
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. LOAD CAPACITANCE
AT DIFFERENT DATA RATES
(V)
LOAD CAPACITANCE (pF)
MAX214-02
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. LOAD CAPACITANCE
AT DIFFERENT DATA RATES
(V)
LOAD CAPACITANCE (pF)
MAX214-01
MAX214
Programmable DTE/DCE,
+5V RS-232 Transceiver_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics

(VCC= 5V, C1 to C4 = 1mF, all transmitters loaded with 3kWin parallel with 2.5nF, TA = +25°C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. POSITIVE SUPPLY VOLTAGE

(V)
VCC (V)
MAX214-04
TRANSMITTER OUTPUT VOLTAGES
vs. V+, V- LOAD CURRENT
OUT
+,
OUT
(V)
LOAD CURRENT (mA)
MAX214-05406080
SLEW RATE vs. LOAD CAPACITANCE

SLEW RATE (V/
LOAD CAPACITANCE (pF)
MAX214-06
200040006000
_______________Detailed Description
The MAX214 RS-232 transceiver provides a complete,
8-line, software-configurable, DTE or DCE port RS-232
interface. Tx, Rx, RTS, CTS, DTR, DSR, DCD, and RI
circuits can be configured as either Data Terminal
Equipment (DTE) or Data Circuit-Terminating
Equipment (DCE) using the DTE/DCE control pin. The
MAX214 eliminates the need to swap cables when
switching between DTE and DCE configurations. This
is useful when, for example, a portable computer is
required to communicate with printers, modems, and
other computers without carrying multiple cables.
The MAX214 runs from a single +5V supply and incor-
porates a dual charge-pump voltage converter to gener-
ate the necessary voltages for the RS-232 transmitters.
A shutdown mode is provided to save power when
transmission is not required, but the receivers always
stay active for simple detection of ring indicator signals.
DTE/DCE Operation

The DTE/DCE pin allows circuit configuration under
software control. Tables 1a and 1b show the pin defini-
tions of the MAX214 in both DTE and DCE modes. The
Function columns show the direction of data flow from
the input pin to the output pin of the MAX214, and onto
the corresponding DB-25 connector’s pin.
+5V to ±10V Dual Charge-Pump
Voltage Converter

The +5V to ±10V conversion is performed by two
charge-pump voltage converters (Figure 2). The first
uses capacitor C1 to double the +5V to +10V, storing
the +10V on the output filter capacitor, C3. The second
charge-pump voltage converter uses C2 to invert the
+10V to -10V, storing the -10V on the V- output filter
capacitor, C4.
In shutdown mode, V+ is pulled to VCCby an internal
resistor, and V- falls to GND.
MAX214
Programmable DTE/DCE,
+5V RS-232 Transceiver
_______________________________________________________________________________________5
______________________________________________________________Pin Description
MAX214
Programmable DTE/DCE,
+5V RS-232 Transceiver_______________________________________________________________________________________
Table 1a. DTE-Operation Pin Configurations
MAX214
Table 1b. DCE-Operation Pin Configurations
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