MAX221CUE+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX221CUE+ ,+5V, 1µA, Single RS-232 Transceiver with AutoShutdownApplicationsMaintenance/Diagnostic PortsIndustrial SystemsTelecommunications Typical Operating Circ ..
MAX221EAE+ ,±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdownMAX221E19-1527; Rev 0; 8/99±15kV ESD-Protected, +5V, 1µA, Single RS-232Transceiver with AutoShutdow ..
MAX221ECAE+ ,±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdownApplicationsTypical Operating CircuitMaintenance/Diagnostic PortsIndustrial Systems+5V 15Telecommun ..
MAX221ECUE ,【15kV ESD-Protected, +5V, 1レA, Single RS-232 Transceiver with AutoShutdownELECTRICAL CHARACTERISTICS(V = +5V ±10%, C1–C4 = 0.1µF, T = T to T , unless otherwise noted. Typica ..
MAX221ECUE+ ,±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdownFeaturesThe MAX221E is a +5V powered, single transmit/♦ Single RS-232 Transceiver in a Small 16-Pin ..
MAX221EEAE+ ,±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdownELECTRICAL CHARACTERISTICS(V = +5V ±10%, C1–C4 = 0.1µF, T = T to T , unless otherwise noted. Typica ..
MAX5307EUE+ ,Low-Power, Low-Glitch, Octal 12-Bit Voltage-Output DACs with Serial InterfaceMAX5306/MAX530719-2132; Rev 0; 8/01Low-Power, Low-Glitch, Octal 12-Bit Voltage-Output DACs with Ser ..
MAX5309EUE ,PLASTIC ENCAPSULATED DEVICES MAX5309EUE Rev. A RELIABILITY REPORT FOR MAX5309EUE PLASTIC ENCA ..
MAX5309EUE+T ,Low-Power, Low-Glitch, Octal 10-Bit Voltage-Output DACs with Serial Interfaceapplications. The low 2nV-s glitch energy1.7mA (max) with V = V = +5.5VREF DDof the MAX5308/MAX5309 ..
MAX5309EUE-T ,Low-Power, Low-Glitch, Octal 10-Bit Voltage-Output DACs with Serial InterfaceApplicationsGain and Offset AdjustmentPin ConfigurationPower Amplifier ControlProcess Control I/O B ..
MAX530ACAG ,+5V, Low-Power, Parallel-Input, Voltage-Output, 12-Bit DACfeatures but with a serial data interface, referto the MAX531/MAX538/MAX539 data sheet.ERRORPART TE ..
MAX530ACNG ,+5V, Low-Power, Parallel-Input, Voltage-Output, 12-Bit DACMAX53019-0168; Rev 3; 7/95+5V, Low-Power, Parallel-Input, Voltage-Output, 12-Bit DAC_______________

MAX221CUE+
+5V, 1µA, Single RS-232 Transceiver with AutoShutdown
General Description
The MAX221 is a +5V-powered, single transmit/receive
RS-232 and V.28 communications interface with auto-
matic shutdown/wake-up features and high data rate
capabilities.
The MAX221 achieves a low 1µA supply current with
Maxim’s revolutionary AutoShutdown™ feature.
AutoShutdown saves power without changes to the
existing BIOS or operating system by entering low-
power shutdown mode when the RS-232 cable is dis-
connected, or when the transmitter of the connected
peripheral is off. The MAX221 wakes up and drives the
INVALIDpin high when an active RS-232 cable is con-
nected, signaling the host that a peripheral is connect-
ed to the communications port.
The MAX221 is available in a 16-pin SSOP package as
well as a 16-pin TSSOP that uses 50% less board space
than a 16-pin SO. For an equivalent RS-232 transceiver
with enhanced ±15kV ESD protection, refer to the
MAX221E data sheet.
Applications
Maintenance/Diagnostic Ports
Industrial Systems
Telecommunications
Set-Top Boxes
FeaturesSingle RS-232 Transceiver in a Small 16-Pin
TSSOP Package1μA Supply CurrentAutoShutdown Saves Power Without
Changes to BIOSGuaranteed 250kbps Data Rate
MAX221
+5V, 1µA, Single RS-232 Transceiver
with AutoShutdownFORCEOFF
VCC
GND
TOUT
FORCEON
TIN
INVALID
ROUT
TOP VIEW
MAX221
TSSOP/SSOP
C1+
C2-
C1-
C2+
RIN
MAX221
FORCEON
ROUT9
FORCEOFF16
INVALID10
GND
TIN11
C2-6
C2+5
C1-4
C1+2
RIN8
TOUT137VCC
VCC
0.1μF
0.1μF 0.1μF 15
C1
0.1μF
C2
0.1μF
CBYPASS
+5V
TO POWER-
MANAGEMENT
UNIT
CAPACITORS MAY BE POLARIZED OR UNPOLARIZED.ypical Operating Circuit
19-1520; Rev 0; 8/99
PART
MAX221CUE
MAX221CAE
MAX221EUE-40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE
16 TSSOP
16 SSOP
16 TSSOP
AutoShutdown is a trademark of Maxim Integrated Products.
Pin Configuration
Ordering Information
MAX221EAE-40°C to +85°C16 SSOP
MAX221
+5V, 1µA, Single RS-232 Transceiver
with AutoShutdown
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = +5V ±10%, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
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.
VCC..........................................................................-0.3V to +6V
V+ ...............................................................(VCC- 0.3V) to +14V
V- ...........................................................................-14V to +0.3V
Input Voltages
TIN..........................................................-0.3V to (V+ + 0.3V)
RIN.................................................................................±30V
FORCEON, FORCEOFF, EN.................-0.3V to (VCC+ 0.3V)
Output Voltages
TOUT..............................................(V- - 0.3V) to (V+ + 0.3V)
ROUT, INVALID....................................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration, TOUT.....................................Continuous
Continuous Power Dissipation (TA= +70°C)
TSSOP (derated 6.7mW/°C above +70°C)................533mW
SSOP (derated 7.1mW/°C above +70°C)..................571mW
Operating Temperature Range
MAX221C_ _.....................................................0°C to +70°C
MAX221E_ _..................................................-40°C to +85°C
Maximum Junction Temperature ...................................+150°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10sec)............................+300°C
Figure 3
Figure 3
No load, TA= +25°C
Figure 3
ISOURCE= 1.0mA
ISINK= 1.6mA
CONDITIONS
ICC= 1µA, Figure 3
ROUT; ISINK= 3.2mA
Figure 3
TIN; EN, FORCEOFF,FORCEON= +25°C, Figure 1= VCC, 0 ≤ROUT ≤VCC
TIN = 0 to VCC
ROUT; ISOURCE= 1.0mA30tINVLReceiver Positive or Negative
Threshold to INVALIDLow1tINVHReceiver Positive or Negative
Threshold to INVALIDHigh250tWUReceiver Threshold to
Transmitter Enabled VCC- 0.6INVALIDOutput Voltage High0.4INVALIDOutput Voltage Low-0.30.3Receiver Input Threshold,
Transmitter Disabled
Positive thresholdV2.7Receiver Input Threshold,
Transmitter Enabled±0.05±10
Negative threshold
Output Leakage Current3.5VOHOutput Voltage High510ICCVCCSupply Current
UNITSMINTYPMAXSYMBOLPARAMETER0.4VOLOutput Voltage Low0.8VILInput Threshold Low110ISHDNShutdown Supply Current110IASAutoShutdown Supply Current±1IINInput Leakage Current
TIN, EN, FORCEOFFV2.4VIHInput Threshold High
DC CHARACTERISTICS
LOGIC INPUTS
AUTOSHUTDOWN
MAX221
+5V, 1µA, Single RS-232 Transceiver
with AutoShutdown
TIMING CHARACTERISTICS
(VCC= +5V ±10%, C1–C4 = 0.1µF, TA = TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V ±10%, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
CONDITIONSUNITSMINTYPMAXSYMBOLPARAMETER
VCC = V+ = V- = 0, VOUT= ±2V
Driver loaded with 3kΩto ground = +25°C, VCC = 5V
VCC= 5V, no hysteresis in shutdown= +25°C, VCC= 5V= +25°C, VCC= 5V±10±60Output Short-Circuit Current300Output Resistance±5±9Output Voltage Swing357Input Resistance 0.5Input Hysteresis1.72.4Input Threshold High0.81.2Input Threshold Low-2525Input Voltage Range= 3kΩto 7kΩ, CL= 50pF to 1000pF,
VCC= 4.5V
CONDITIONS
kbps250Maximum Data Rate
UNITSMINTYPMAXSYMBOLPARAMETER= +25°C, VCC= 5V, RL= 3kΩto 7kΩ, = 500pF to 1000pF, measured from
-3V to +3V or +3V to -3V
(Note 1)
Normal operation
Normal operation= 150pF
V/µs3630Transition-Region Slew Rate50|tPHL - tPLH|Receiver Skew200|tPHL - tPLH|Transmitter Skew200Receiver Output Disable Time300Receiver Output Enable Time0.15tPHL,tPLHReceiver Propagation Delay
Note 1:Transmitter skew is measured at the transmitter zero crosspoints.
RECEIVER INPUT
TRANSMITTER OUTPUT
MAX221
+5V, 1µA, Single RS-232 Transceiver
with AutoShutdown
Typical Operating Characteristics
(VCC= +5V, 250kbps data rate, 0.1µF capacitors, transmitter loaded with 3kΩand CL, TA= +25°C, unless otherwise noted.)
TRANSMITTER OUTPUT
VOLTAGE vs. LOAD CAPACITANCE
MAX221-01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
250kbps
250kbps
120kbps20kbps
20kbps120kbps10002000300040005000
SLEW RATE vs.
LOAD CAPACITANCE
MAX221-02
LOAD CAPACITANCE (pF)
SLEW RATE (V/+SLEW
-SLEW10002000300040005000
OPERATING SUPPLY
CURRENT vs. LOAD CAPACITANCE
MAX221-03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
20kbps120kbps
FUNCTIONPINNAMEENReceiver Enable Control. Drive low for normal operation. Drive high to force the receiver output
(ROUT) into a high-impedance state.C1+Positive Terminal of the Voltage Doubler Charge-Pump CapacitorV+Positive Voltage Generated by the Charge PumpV-Negative Voltage Generated by the Charge PumpC2-Negative Terminal of the Inverting Charge-Pump CapacitorC2+Positive Terminal of the Inverting Charge-Pump CapacitorC1-Negative Terminal of the Voltage Doubler Charge-Pump CapacitorFORCEONDrive high to override automatic circuitry, keeping transmitter and charge pump on.
FORCEOFFmust be high (Table 1).TINTTL/CMOS Transmitter InputINVALIDOutput of the Invalid Signal Detector. INVALIDis pulled low if no valid RS-232 level is present on
the receiver input.ROUTTTL/CMOS Receiver OutputRINRS-232 Receiver Input
Pin DescriptionFORCEOFFForce-Off Input, active low. Drive low to shut down transmitter, receiver, and on-board charge
pump. This overrides all automatic circuitry and FORCEON (Table 1).VCC+4.5V to +5.5V Supply VoltageGNDGroundTOUTRS-232 Transmitter Output
MAX221
+5V, 1µA, Single RS-232 Transceiver
with AutoShutdown
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX221’s internal power supply consists of a dual
charge pump that provides a positive output voltage
(doubling charge pump) and a negative voltage (invert-
ing charge pump) from a single +5V supply. The
charge pumps operate in continuous mode. Each
charge pump requires a flying capacitor (C1, C2) and a
reservoir capacitor (C3, C4) to generate the V+ and V-
supplies.
RS-232 Transmitter
The transmitter is an inverting level translator that con-
verts CMOS-logic levels to 5.0V EIA/TIA-232 levels. It
guarantees a 250kbps data rate with worst-case loads
of 3kΩin parallel with 1000pF.
When FORCEOFFis driven to ground, or when the
AutoShutdown circuitry senses invalid voltage levels on
the receiver input, the transmitter is disabled and the out-
put is forced into a high-impedance state. The transmitter
input does not have a pull-up resistor.
RS-232 Receiver
The MAX221’s receiver converts RS-232 signals to
CMOS-logic output levels. The receiver has an inverting
three-state output and can be active or inactive. In shut-
down (FORCEOFF= low) or in AutoShutdown, the
receiver is active (Table 1). Drive ENhigh to place the
receiver in a high-impedance state. The receiver is high
impedance when the MAX221 is in shutdown (FORCE-
OFF= low).
The MAX221’s INVALIDoutput is pulled low when no
valid RS-232 signal level is detected on the receiver
input. INVALIDis functional in any mode (Figures 2
and 3).
AutoShutdown
The MAX221 achieves 1µA supply current with Maxim’s
AutoShutdown feature, which operates when FORCEON
is low and FORCEOFFis high. When the device senses
no valid signal levels on the receiver input for 30µs, the
on-board charge pump and driver are shut off, reducing
supply current to 1µA. This occurs if the RS-232 cable is
disconnected or the connected peripheral transmitter is
turned off. The MAX221 turns on again when a valid
level is applied to the RS-232 receiver input. As a result,
the system saves power without changes to the existing
BIOS or operating system.
Table 1 and Figure 2c summarize the MAX221 operat-
ing modes. FORCEON and FORCEOFFoverride
AutoShutdown. When neither control is asserted, the
device selects between these states automatically,
based on the receiver input level. Figures 2a, 2b, and
3a depict valid and invalid RS-232 receiver levels.
Figure 3 shows the input levels and timing diagram for
AutoShutdown operation.
A device or another system with AutoShutdown con-
nected to the MAX221 may need time to wake up.
Figure 4 shows a circuit that forces the transmitter on
for 100ms, allowing enough time for the other system to
realize that the MAX221 is awake. If the other system
transmits valid RS-232 signals within that time, the RS-
232 ports on both systems remain enabled.
When shut down, the device’s charge pumps are off,
V+ is pulled to VCC, V- is pulled to ground, and the
transmitter output is high impedance. The time required
to exit shutdown is typically 100µs (Figure 3b).
Software-Controlled Shutdown
For direct software control, use INVALIDto indicate a
DTR or Ring Indicator signal. Connect FORCEOFFand
FORCEON together to disable AutoShutdown so the
line acts like a SHDNinput.
MAX221
FORCEON
ROUT9
FORCEOFF16
GND
TIN11
C2-6
C2+5
C1-4
C1+2
ISHDN
RIN8
TOUT1373VCC
0.1μF
0.1μF
C1
0.1μF
C2
0.1μF
CBYPASS
+5V
TO POWER-
MANAGEMENT
UNIT
INVALID
0.1μF
15
Figure 1. Shutdown Current Test Circuit
MAX221
+5V, 1µA, Single RS-232 Transceiver
with AutoShutdown
Table 1. Output Control Truth TableNo
Shutdown
(AutoShutdown)High-Z1High-Z0
OPERATION
STATUS0
VALID
RECEIVER
LEVEL
Shutdown
(Forced Off)
Normal Operation
(Forced On)0
Yes
Normal Operation
(AutoShutdown)
Yes0
High-Z
Active
Active
High-Z
TOUT
Active
High-Z
Active
FORCEOFF
High-Z
High-Z
Active
Active
ROUT
High-Z
Active
Active
FORCEON
X = Don’t care
RS-232 SIGNAL PRESENT
AT RECEIVER INPUTINVALIDOUTPUT
YesHighLow
Table 2. INVALIDTruth Table
+0.3V
-0.3V
INVALID
TO MAX221
POWER SUPPLY
AND TRANSMITTERRIN
* TRANSMITTER IS DISABLED, REDUCING SUPPLY CURRENT TO 1μA IF
RECEIVER INPUT IS BETWEEN +0.3V AND -0.3V FOR AT LEAST 30μs.
30μs
COUNTER
+2.7V
-2.7V
INVALID
TO MAX221
POWER SUPPLYRIN
* TRANSMITTER IS ENABLED IF:
RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V;
RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR LESS THAN 30μs.
30µs
COUNTER
Figure 2b. Transmitter Enabled Using AutoShutdown
Figure 2a. Entering 1µA Supply Mode via AutoShutdown
FORCEOFFPOWER DOWN
INVALID
FORCEON
INVALID IS AN INTERNALLY GENERATED SIGNAL USED BY
THE AUTOSHUTDOWN LOGIC AND APPEARS AS AN OUTPUT.
POWER DOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE
OPERATIONAL STATUS OF THE TRANSMITTER AND POWER SUPPLIES.
Figure 2c. AutoShutdown Logic

Partno	Mfg	Dc	Qty	Available	Descript
MAX221CUE+ \|MAX221CUE	MAX	N/a	8	avai	+5V, 1µA, Single RS-232 Transceiver with AutoShutdown