MAX3311CUB ,460kbps / 1A Supply Current / RS-232-Compatible Transceivers in MAXApplications PART TEMP. RANGE PIN-PACKAGE MAX3311CUB 0 °C to +70°C 10 µMAXDigital Cameras MAX3311EU ..
MAX3311CUB ,460kbps / 1A Supply Current / RS-232-Compatible Transceivers in MAXELECTRICAL CHARACTERISTICS(V = +5V, C1 and C2 = 0.1µF, T = T to T . Typical values are at T = +25°C ..
MAX3311CUB+ ,460kbps, 1µA Supply Current, RS-232-Compatible Transceivers in µMAXApplications PART TEMP. RANGE PIN-PACKAGE MAX3311CUB 0°C to +70°C 10 µMAXDigital Cameras MAX3311EUB ..
MAX3311CUB+T ,460kbps, 1µA Supply Current, RS-232-Compatible Transceivers in µMAXELECTRICAL CHARACTERISTICS(V = +5V, C1 and C2 = 0.1µF, T = T to T . Typical values are at T = +25°C ..
MAX3311ECUB+ ,±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAXApplicationsDigital CamerasPDAsTypical Operating CircuitGPSPOS+5VTelecommunicationsCBYPASS10.1μFHan ..
MAX3311ECUB+ ,±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAXapplications where more robust transceivers arerequired.♦ INVALID Output (MAX3313E)Both devices hav ..
MAX695CWE ,Microprocessor supervisory circuit.19-02 18; He V 2; 4/95
MAX695CWE ,Microprocessor supervisory circuit.General Description
The MAX690 Family of supervisory circuits reduce the
complexity and number ..
MAX695CWE ,Microprocessor supervisory circuit.ELECTRICAL CHARACTERISTICS
(Vcc = full operating range, VBATT = 2.8V, T, = 25°C, unless otherwis ..
MAX695CWE ,Microprocessor supervisory circuit.General Description
The MAX690 Family of supervisory circuits reduce the
complexity and number ..
MAX695CWE ,Microprocessor supervisory circuit.ELECTRICAL CHARACTERISTICS
(Vcc = full operating range, VBATT = 2.8V, T, = 25°C, unless otherwis ..
MAX695CWE+ ,Microprocessor Supervisory CircuitsFeaturesThe MAX690 family of supervisory circuits reduces the ● Supervisory Function Integration Sa ..
MAX3311CUB-MAX3311EUB
460kbps / 1A Supply Current / RS-232-Compatible Transceivers in MAX
General DescriptionThe MAX3311/MAX3313 are low-power, +5V EIA/TIA-
232-compatible transceivers. Both devices have one
transmitter and one receiver. The transceivers have a
proprietary low-dropout transmitter output stage
enabling RS-232-compatible operation from a +5V sup-
ply with a single inverting charge pump. These devices
require only three 0.1µF capacitors and will run at data
rates up to 460kbps while maintaining RS-232-compati-
ble output levels.
The MAX3311 features a 1µA shutdown mode. In shut-
down the device turns off the charge pump, pulls V- to
ground, and the transmitter output is disabled. The
MAX3313 features an INVALIDoutput that asserts high
when an active RS-232 cable signal is connected, sig-
naling to the host that a peripheral is connected to the
communication port.
________________________ApplicationsDigital Cameras
PDAs
GPS
POS
Telecommunications
Handy Terminals
Set-Top Boxes
Features1µA Low-Power Shutdown (MAX3311)INVALID
Output (MAX3313)Receiver Active in Shutdown (MAX3311)Single Transceiver (1Tx/1Rx) in 10-Pin µMAXRS-232-Compatible Operation
MAX3311/MAX3313
460kbps, 1µA Supply Current,
RS-232-Compatible Transceivers in µMAX
Pin Configurations19-1901; Rev 0; 2/01
Ordering Information
Typical Operating Circuit
MAX3311/MAX3313
460kbps, 1µA Supply Current,
RS-232-Compatible Transceivers in µMAX
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICSStresses 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.
VCCto GND..............................................................-0.3V to +6V
V- to GND.................................................................+0.3V to -7V
VCC+ |V-|.............................................................................+13V
Input Voltages
TIN, SHDNto GND.................................................-0.3V to +6V
RIN to GND........................................................................±25V
Output Voltages
TOUT to GND..................................................................±13.2V
ROUT, INVALIDto GND.......................…-0.3V to (VCC+ 0.3V)
Short-Circuit Duration
TOUT to GND...........................................................Continuous
Continuous Power Dissipation
10-Pin µMAX (derate 5.6mW/°C above +70°C).............444mW
Operating Temperature Ranges
MAX331_CUB.......................................................0°C to +70°C
MAX331_EUB....................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX3311/MAX3313
460kbps, 1µA Supply Current,
RS-232-Compatible Transceivers in µMAX
Note 1:Not tested—guaranteed by design.
TIMING CHARACTERISTICS
ELECTRICAL CHARACTERISTICS (continued)
MAX3311/MAX3313
460kbps, 1µA Supply Current,
RS-232-Compatible Transceivers in µMAX
Typical Operating Characteristics(VCC= +5V, 0.1µF capacitors, transmitter loaded with 3kΩand CL, TA= +25°C, unless otherwise noted.)
MAX3311/MAX3313
460kbps, 1µA Supply Current,
RS-232-Compatible Transceivers in µMAX
Detailed Description
Single Charge-Pump Voltage ConverterThe MAX3311/MAX3313 internal power supply has a
single inverting charge pump that provides a negative
voltage from a single +5V supply. The charge pump
operates in a discontinuous mode and requires a flying
capacitor (C1) and a reservoir capacitor (C2) to gener-
ate the V- supply.
RS-232-Compatible DriverThe transmitter is an inverting level translator that con-
verts CMOS-logic levels to EIA/TIA-232-compatible lev-
els. It guarantees data rates up to 460kbps with
worst-case loads of 3kΩin parallel with 1000pF. When
SHDNis driven low, the transmitter is disabled and put
into three state. The transmitter input does not have an
internal pullup resistor.
RS-232 ReceiverThe MAX3311/MAX3313 receiver converts RS-232 sig-
nals to CMOS-logic output levels. The MAX3311 receiv-
er will remain active during shutdown mode. The
MAX3313 INVALIDindicates when an RS-232 signal is
present at the receiver input, and therefore when the
port is in use.
The MAX3313 INVALIDoutput is pulled low when no
valid RS-232 signal level is detected on the receiver
input.
MAX3311 Shutdown ModeIn shutdown mode, the charge pump is turned off, V- is
pulled to ground, and the transmitter output is disabled
(Table 1). This reduces supply current typically to 1µA.
The time required to exit shutdown is typically less than
100µs.
Applications Information
Capacitor SelectionThe capacitor type used for C1 and C2 is not critical for
proper operation; either polarized or nonpolarized
capacitors are acceptable. If polarized capacitors are
used, connect polarity as shown in the Typical
Operating Circuit. The charge pump requires 0.1µF
capacitors. Increasing the capacitor values (e.g., by a
factor of 2) reduces power consumption. C2 can be
increased without changing C1’s value. However, do
not increase C1’s value without also increasing the
value of C2 and CBYPASSto maintain the proper ratios
(C1 to the other capacitors).
When using the minimum 0.1µF capacitors, make sure
the capacitance does not degrade excessively with
temperature. If in doubt, use capacitors with a larger
nominal value. The capacitor’s equivalent series resis-
tance (ESR) usually rises at low temperatures and influ-
ences the amount of ripple on V-.
To reduce the output impedance at V-, use larger
capacitors (up to 10µF).
Bypass VCCto ground with at least 0.1µF. In applica-
tions sensitive to power-supply noise generated by the
charge pump, decouple VCCto ground with a capaci-
tor the same size as (or larger than) charge-pump
capacitors C1 and C2.
Transmitter Output when Exiting
ShutdownFigure 1 shows the transmitter output when exiting
shutdown mode. The transmitter is loaded with 3kΩin
parallel with 1000pF. The transmitter output displays no
ringing or undesirable transients as the MAX3311
comes out of shutdown. Note that the transmitter is
enabled only when the magnitude of V- exceeds
approximately -3V.
MAX3311/MAX3313
High Data RatesThe MAX3311/MAX3313 maintain RS-232-compatible
transmitter output voltage (±3.7V minimum) even at
high data rates. Figure 2 shows a transmitter loopback
test circuit. Figure 3 shows the loopback test result at
120kbps, and Figure 4 shows the same test at
250kbps.
460kbps, 1µA Supply Current,
RS-232-Compatible Transceivers in µMAX
