MAX214CWI+-MAX214EWI+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX214CWI+ ,Programmable DTE/DCE, +5V RS-232 TransceiverELECTRICAL CHARACTERISTICS(V = 4.5V to 5.5V, C1 to C4 = 1μF, T = T to T , unless otherwise noted.)C ..
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MAX214CWI+-MAX214EWI+
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
____________________________FeaturesEliminates 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.
Programmable DTE/DCE, V RS-232 Transceiver
________________________________________________________________Maxim Integrated Products1
TOP VIEW
MAX214
C1-
C1+
SHDN
DTE/DCE
TRB
RTB
TRC
RTC
VCC
C2+
C2-
HI-Z
N.C.
RDC
TRA
RTA
RDTC
RRE
GND
DIP/SO
__________________Pin Configuration
RTA
VCC
TRA
TRB
RTB
TRC
RTC
RDTC
RRERE
C1+
C1-
C2+
C2-
GND
1μF
1μF
1μF
1μF
+5V
DTE
DTE
DCE
DTE
DTE
DCE
DTE
DTE
DCE
DTEDTE
DCE
DTE/DCE
SHDN
HI-Z
RDCDCE
MAX214
1μF
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
PARTTEMP. RANGEPIN-PACKAGE
MAX214CPI0°C to +70°C28 Plastic DIP
MAX214CWI0°C to +70°C28 Wide SO
MAX214C/D0°C to +70°CDice*
MAX214EPI-40°C to +85°C28 Plastic DIP
MAX214EWI-40°C to +85°C28 Wide SO
19-0199; Rev 1; 8/95
Programmable DTE/DCE, V 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 = 1μF, 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.
PARAMETERMINTYPMAXUNITS
Output Short-Circuit Current±7±25mA
Transmitter Output Resistance300300kΩ
Output Voltage Swing±5.0±7.5V
Logic Input Pull-Up Current11050μA
Input Voltage Operating Range±15V
Positive Threshold Input Low0.81.3V
Positive Threshold Input High1.82.4V
Logic Input Threshold Low0.81.4V
Logic Input Threshold High1.42.0V
0.20.51.0V
Negative Threshold Input Low0.81.3V
Negative Threshold Input High1.32.4V
Negative Threshold Input
Hysteresis0.20.41.0V
Input Resistance100300kΩ
TTL/CMOS Output Voltage Low0.20.4V
TTL/CMOS Output Voltage High3.5VCC - 0.2V
CONDITIONS
VCC= 5V, normal operation, SHDN = 0V (no hysteresis
in shutdown)
VOUT= 0V= +25°C, VCC= 5V
VCC= V+ = V- = 0V, VOUT= ±2V (Note 1)
All transmitter outputs loaded with 3kΩto ground
Normal operation= +25°C, VCC= 5V
VCC= 5V, normal operation, SHDN = 0V (no hysteresis
in shutdown)= +25°C, VCC= 5V, normal operation, SHDN = 0V= +25°C, VCC= 5V, normal operation, SHDN = 0V
HI-Z = 5V or SHDN = 5V
IOUT= 3.2mA
IOUT= -1.0mA
Shutdown, SHDN = 5V
Shutdown, SHDN = 5V
Shutdown±0.01±1
Normal operation, SHDN = 0V-2.6-1.9
-1.5-0.2Normal operation, SHDN = 0V
HI-Z = 0V and SHDN = 0V357
Positive Threshold Input
Hysteresis
RS-232 TRANSMITTERS
RS-232 RECEIVERS
Programmable DTE/DCE, V RS-232 Transceiver
_______________________________________________________________________________________3
PARAMETER
Transmitter + to - Propagation-Delay
Difference (Normal Operation)
MINTYPMAX
UNITS
Input Leakage Current
Receiver Propagation Delay,
RS-232 to TTL (Normal Operation)
Logic Input Threshold High1.32.0V
Logic Input Threshold Low0.81.3
Receiver Propagation Delay,
RS-232 to TTL (Shutdown Mode)
Data Rate20kbps
1.510μs
Receiver Propagation-Delay Difference
(Normal Operation)
Transition-Region Slew Rate61230
V/μs
Transmitter Propagation Delay,
TTL to RS-232 (Normal Operation)
1.43.5μs
Transmitter Enable Time
VCCSupply Current
250μs
Transmitter Disable Time600ns
Transmitter DTE/DCE Switch Time600ns
Receiver DTE/DCE Switch Time20mA
300ns
Receiver Termination-Resistor
Connect/Disconnect Time
Shutdown Supply Current
300ns20μA
Receiver Termination-Resistor Connect
Entering SHDN Time250μs
Receiver Termination-Resistor
Disconnect Exiting SHDN Time300ns
CONDITIONS
tPHLT- tPLHT
Receivers in shutdown mode
tPLHR
tPHLT- tPLHT
TA = +25°C, VCC= 5V, RL= 3kΩto 7kΩ,= to 2500pF,
measured from 3V to -3V or -3V to 3V
tPLHT
tTEN(includes charge-pump start-up time)
tTTR
tTSW
No load, TA= +25°C
tRSW
(SHDN = 0V)
DTE/DCE = 0V, SHDN =
HI-Z = VCC, Figure 1
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 4.5V to 5.5V, C1 to C4 = 1μF, TA= TMIN to TMAX, unless otherwise noted.)= TMINto TMAX= +25°C
Normal operation, transmitters and receivers
tPHLT
tPHLR, tPLHR0.41.5
tPHLR0.410
Note 1:The 300Ωminimum is the EIA/TIA-232E specification, but the actual resistance when in shutdown mode or when VCC= 0V
is typically 300kΩ.
MODE-CHANGE TIMING (DTE/DCE)
AC CHARACTERISTICS
POWER SUPPLY
CONTROL LOGIC(DTE/DCE, SHDN, HI-Z)
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. VCC POSITIVE SUPPLY VOLTAGE
(V
VCC (V)
MAX214-03
1 TRANSMITTER LOADED
2 TRANSMITTERS LOADED
3 TRANSMITTERS LOADED
DATA RATE = 0kbps
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. LOAD CAPACITANCE
AT DIFFERENT DATA RATES
(V
LOAD CAPACITANCE (pF)
AX214-02
20kbps
64kbps
120kbps
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. LOAD CAPACITANCE
AT DIFFERENT DATA RATES
L (V
LOAD CAPACITANCE (pF)
MAX214-01
120kbps
64kbps
20kbps
Programmable DTE/DCE, V RS-232 Transceiver_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(VCC= 5V, C1 to C4 = 1μF, all transmitters loaded with 3kΩin parallel with 2.5nF, TA = +25°C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. POSITIVE SUPPLY VOLTAGE
(V
VCC (V)
MAX214-04
3 TRANSMITTERS LOADED
2 TRANSMITTERS LOADED
1 TRANSMITTER LOADED
DATA RATE = 0kbps
TRANSMITTER OUTPUT VOLTAGES
vs. V+, V- LOAD CURRENT
, T
(V
LOAD CURRENT (mA)
MAX214-05406080
V+ AND V-
EQUALLY
LOADED
V+ LOADED,
NO LOAD
ON V-
V- LOADED,
NO LOAD
ON V+
ALL TRANSMITTERS UNLOADED, 0kbps
SLEW RATE vs. LOAD CAPACITANCE
(V
LOAD CAPACITANCE (pF)
AX214-06
SLEW+
3 TRANSMITTERS LOADED
SLEW-
3 TRANSMITTERS LOADED
SLEW+
1 TRANSMITTER LOADED
SLEW-
1 TRANSMITTER LOADED
_______________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.
Programmable DTE/DCE, V RS-232 Transceiver
_______________________________________________________________________________________5
PIN
NAME
9, 18, 20TRA, TRC, TRBV+RDC
6, 8, 22, 23RA, RE, RC, RB
5, 24, 25TA, TC, TB
10, 17, 19RTA, RTC, RTBRDTC
VCC
DTE/DCE
RREGNDSHDN
27, 28
C1+, C1-
1, 2C2+, C2-
HI-ZN.C.
FUNCTION
-2VCCvoltage generated by the charge pump
+2VCCvoltage generated by the charge pump
TTL/CMOS receiver A, E, C, B outputs
TTL/CMOS driver A, C, B inputs
+4.5V to +5.5V supply voltage
RS-232 receiver input
Ground
Shutdown control; shutdown high, normal operation low
Terminals for positive charge-pump capacitor
Terminals for negative charge-pump capacitor
No connect—not internally connected
______________________________________________________________Pin Description
RS-232 receiver impedance control. Take high to disconnect the termination resistor.
TTL/CMOS DTE receiver output D for DTE/DCE = 0V, or TTL/CMOS DCE receiver output C for
DTE/DCE = +5V
RS-232 DTE receiver input for DTE/DCE= 0V, or RS-232 DCE driver output for DTE/DCE= +5V
RS-232 DTE receiver input D for DTE/DCE= 0V, or RS-232 DCE driver output C for
DTE/DCE= +5V
Data terminal equipment (DTE) and data circuit-terminating equipment (DCE) control pin.
DCE active high and DTE active low.
RS-232 DTE driver output for DTE/DCE= 0V, or RS-232 DCE receiver input for DTE/DCE= +5V
Programmable DTE/DCE, V RS-232 Transceiver_______________________________________________________________________________________
Table 1a. DTE-Operation Pin Configurations
TTL/CMOS
I/O LABEL
MAX214
PIN
Detector Carrier Data (DCD)7
Data Set Ready (DSR)22
Data Terminal Ready (DTR)24
Clear to Send (CTS)23
Ring Indicator (RI)8
Receiver (RxD)
Transmitter (TxD)
Request to Send (RTS)25
FUNCTION
RS-232
I/O LABEL
DCD
DSR
DTR
CTS
TxD
RxD
RTS
INPUT
THRESHOLD
MAX214
PIN
DB-25
PIN
Table 1b. DCE-Operation Pin Configurations
MAX214
PIN
MAX214
PIN
RS-232
I/O LABEL
DTR
DSR
RTS23
DCD
RxD
TxD
CTS
INPUT
THRESHOLD
DB-25
PIN
FUNCTION

Partno	Mfg	Dc	Qty	Available	Descript
MAX214CWI+ \|MAX214CWI	MAXIM	N/a	2000	avai	Programmable DTE/DCE, +5V RS-232 Transceiver
MAX214EWI+ \|MAX214EWI	MAXIM	N/a	20	avai	Programmable DTE/DCE, +5V RS-232 Transceiver