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MAX3385EMAXN/a674avai±15kV ESD-Protected, 3.0 to 5.5V, Low-Power, Up to 250kbps, True RS-232 Transceiver


MAX3385E ,±15kV ESD-Protected, 3.0 to 5.5V, Low-Power, Up to 250kbps, True RS-232 TransceiverFeaturesThe MAX3385E is a 3V-powered EIA/TIA-232 and♦ ESD Protection for RS-232 I/O PinsV.28/V.24 c ..
MAX3385ECAP ,15kV ESD-Protected / 3.0V to 5.5V / Low-Power / up to 250kbps / True RS-232 TransceiverELECTRICAL CHARACTERISTICS(V = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C ..
MAX3385ECAP-T ,±15kV ESD-Protected, 3.0 to 5.5V, Low-Power, Up to 250kbps, True RS-232 TransceiverFeaturesThe MAX3385E is a 3V-powered EIA/TIA-232 and♦ ESD Protection for RS-232 I/O PinsV.28/V.24 c ..
MAX3385ECWN ,15kV ESD-Protected / 3.0V to 5.5V / Low-Power / up to 250kbps / True RS-232 Transceiverfeatures a 1µA shutdown mode that reduces power con-PART TEMP. RANGE PIN-PACKAGEsumption and extend ..
MAX3385EEAP ,15kV ESD-Protected / 3.0V to 5.5V / Low-Power / up to 250kbps / True RS-232 TransceiverFeaturesThe MAX3385E is a 3V-powered EIA/TIA-232 and ESD Protection for RS-232 I/O PinsV.28/V.24 c ..
MAX3386ECPW ,RS-232 Transceiver With Split Supply Pin for Logic Side 20-TSSOP 0 to 70FEATURESPW OR DW PACKAGE• V Pin for Compatibility With Mixed-VoltageTOP VIEWLSystems Down to 2.5 V ..
MAX705 ,Low-Cost, µP Supervisory CircuitsApplications lead-free by adding the + symbol at the endof the part number when ordering. ● Comput ..
MAX705 ,Low-Cost, µP Supervisory CircuitsElectrical Characteristics(V = 4.75V to 5.5V for MAX705/MAX707/MAX813L, V = 4.5V to 5.5V for MAX706 ..
MAX705CPA ,Low-Cost, uP Supervisory CircuitsMAX705–MAX708/MAX813L19-4334; Rev. 5; 9/95Low-Cost, µP Supervisory Circuits_______________
MAX705CPA+ ,Low-Cost, µP Supervisory CircuitsFeaturesThe MAX705–MAX708/MAX813L microprocessor (µP) ● Supervisory-Function Integration Significan ..
MAX705CSA ,Low-Cost, uP Supervisory CircuitsFeaturesThe MAX705-MAX708/MAX813L microprocessor (µP) ' µMAX Package: Smallest 8-Pin SOsupervisory ..
MAX705CSA ,Low-Cost, uP Supervisory CircuitsGeneral Description _______


MAX3385E
±15kV ESD-Protected, 3.0 to 5.5V, Low-Power, Up to 250kbps, True RS-232 Transceiver
________________General Description
The MAX3385E is a 3V-powered EIA/TIA-232 and
V.28/V.24 communications interface with low power
requirements, high data-rate capabilities, and en-
hanced electrostatic discharge (ESD) protection. All
transmitter outputs and receiver inputs are protected to
±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV
using IEC 1000-4-2 Contact Discharge, and ±15kV
using the Human Body Model.
The transceiver has a proprietary low-dropout transmit-
ter output stage, delivering true RS-232 performance
from a +3.0V to +5.5V supply with a dual charge pump.
The charge pump requires only four small 0.1µF capac-
itors for operation from a +3.3V supply. Each device is
guaranteed to run at data rates of 250kbps while main-
taining RS-232 output levels.
The MAX3385Ehas two receivers and two drivers. It
features a 1µA shutdown mode that reduces power con-
sumption and extends battery life in portable systems.
Its receivers can remain active in shutdown mode,
allowing external devices such as modems to be moni-
tored using only 1µA supply current.
The MAX3385E is available in a space-saving SSOP
package in either the commercial (0°C to +70°C) or
extended-industrial (-40°C to +85°C) temperature range.
________________________Applications

Hand-Held Equipment Battery-Powered
PeripheralsEquipment
Printers
____________________________Features
ESD Protection for RS-232 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
Latchup Free300µA Supply Current1µA Low-Power Shutdown with Receivers Active250kbps Guaranteed Data Rate250µs Time to Exit Shutdown with 3kΩLoad on V+6V/µs Guaranteed Slew RateMeets EIA/TIA-232 Specifications Down to 3.0V
MAX3385E
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power
up to 250kbps, True RS-232 Transceiver
10
SHDN
VCC
GND
T1OUTC1-
C1+
N.C.
R1IN
R1OUT
T2IN
R2OUT
T2OUT
C2-
C2+R2IN
N.C.
SSOP

T1IN
N.C.
MAX3385E
TOP VIEW
MAX3385E
R2OUT
R1OUT
R2IN
GND
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T2IN
T1IN
C2-
C2+
C1-
C1+
R1IN
T2OUT
T1OUT
VCC
C1
0.1μF
C2
0.1μF
CBYPASS
+3.3V
RS-232
INPUTS
TTL/CMOS
OUTPUTS5k
SHDN
C3*
0.1μF
0.1μF
* C3 CAN BE RETURNED TO EITHER VCC OR GROUND.
NOTE: SEE TABLE 2 FOR CAPACITOR SELECTION
Pin Configurations

19-1437; Rev 1; 10/99
†Cg.
Typical Operating Circuit
Ordering Information
PART

MAX3385ECAP
MAX3385EEAP-40°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE

20 SSOP
20 SSOP
MAX3385ECWN0°C to +70°C18 SO
Pin Configurations continued at end of data sheet.
MAX3385E
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; 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.
VCCto GND..............................................................-0.3V to +6V
V+ to GND (Note 1)..................................................-0.3V to +7V
V- to GND (Note 1)...................................................+0.3V to -7V
V+ + |V-| (Note 1).................................................................+13V
Input Voltages
T_IN, SHDNto GND..............................................-0.3V to +6V
R_IN to GND.....................................................................±25V
Output Voltages
T_OUT to GND...............................................................±13.2V
R_OUT.....................................................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration, T_OUT to GND.......................Continuous
Continuous Power Dissipation (TA= +70°C)
20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW
18-Pin SO (derate 9.52mW/°C above +70°C)...............762mW
Operating Temperature Ranges
MAX3385ECAP....................................................0°C to +70°C
MAX3385ECWN...................................................0°C to +70°C
MAX3385EEAP.................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
TA = +25°C
SHDN= VCC, no load
TA = +25°C
TA = +25°C
IOUT= 1.6mA
R_OUT, receivers disabled
T_IN, SHDN
T_IN, SHDN
IOUT= -1.0mA
CONDITIONS
357Input Resistance0.5Input Hysteresis1.82.4Input Threshold High1.52.40.81.5Input Threshold Low0.61.2-25+25Input Voltage RangeVCC-VCC-
0.60.1Output Voltage High0.31Supply Current0.4Output Voltage Low±0.05±10Output Leakage Current0.5Transmitter Input Hysteresis0.8Input Logic Threshold Low
2.0V2.4Input Logic Threshold High
UNITSMINTYPMAXPARAMETER
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
VCC= 5.0V
VCC= 3.3V
VCC= 3.3V
VCC= 5.0V
VCC= 3.3V
VCC= 5.0V
T_IN, SHDNµA±0.01±1Input Leakage Current
SHDN= GNDµA110Shutdown Supply Current
DC CHARACTERISTICS (VCC
= +3.3V or +5V, TA= +25°C)
LOGIC INPUTS
RECEIVER OUTPUTS
RECEIVER INPUTS
MAX3385E
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power
up to 250kbps, True RS-232 Transceiver
Note 2:
Transmitter skew is measured at the transmitter zero cross points.
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +25°C.)
Receiver input to receiver output,= 150pF= 3kΩ, CL= 1000pF,
one transmitter switching
VCC= 3.3V, = +25°C, = 3kΩto 7kΩ,
measured from +3V
to -3V or -3V to +3V
VOUT≥+3.7V, RLOADat V+ = 3kΩ
(Note 2)
CONDITIONS
0.15tPLHReceiver Propagation Delay0.15tPHL
kbps250Maximum Data Rate
630250Time to Exit Shutdown100tPHL - tPLHTransmitter Skew50tPHL - tPLHReceiver Skew
UNITSMINTYPMAXSYMBOLPARAMETER

VCC= V+ = V- = 0, transmitter output = ±2V
All transmitter outputs loaded with 3kΩto ground
IEC1000-4-2 Contact Discharge
IEC1000-4-2 Air Discharge
Human Body Model
VCC= 0 or 3V to 5.5V, VOUT= ±12V, transmitters disabled
CONDITIONS
30010MOutput Resistance±5±5.4Output Voltage Swing
R_IN, T_OUT±15kV
±15±60Output Short-Circuit Current±25Output Leakage Current
UNITSMINTYPMAXPARAMETER
TIMING CHARACTERISTICS

(VCC= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +25°C.)= 150pF to
1000pF= 150pF to
2500pF
V/µs
Transition-Region Slew Rate
TRANSMITTER OUTPUTS
ESD PROTECTION
PIN
MAX3385E
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver
__________________________________________Typical Operating Characteristics

(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩand CL, TA = +25°C, unless otherwise noted.)10002000300040005000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE

MAX3385E-01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
VOUT+
VOUT-10002000300040005000
SLEW RATE vs. LOAD CAPACITANCE

MAX3885E-02
LOAD CAPACITANCE (pF)
SLEW RATE (V/
+SLEW
FOR DATA RATES UP TO 250kbps
-SLEW20001000300040005000
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE

MAX3885E-03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbpsNo Connection. Not internally connected.N.C.+5.5V generated by the charge pump.V+Negative terminal of the voltage-doubler charge-pump capacitor.C1-Positive terminal of inverting charge-pump capacitor.C2+Negative terminal of inverting charge-pump capacitor.C2--5.5V generated by the charge pump.V-
8, 15RS-232 Transmitter OutputsT_OUT
9, 14RS-232 Receiver InputsR_IN
10, 13TTL/CMOS Receiver OutputsR_OUT
11, 12TTL/CMOS Transmitter InputsT_INGroundGND+3.0V to +5.5V Supply VoltageVCCActive-Low Shutdown-Control Input. Drive low to shut down transmitters and chargeSHDN
FUNCTIONNAME
______________________________________________________________Pin Description
Positive terminal of the voltage-doubler charge-pump capacitor.C1+
PIN

1, 10, 11
8, 17
9, 16
12, 15
13, 14SSOP
MAX3385E
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power
up to 250kbps, True RS-232 Transceiver
_______________Detailed Description
Dual Charge-Pump Voltage Converter

The MAX3385E’s internal power supply consists of a
regulated dual charge pump that provides output volt-
ages of +5.5V (doubling charge pump) and -5.5V
(inverting charge pump), over the 3.0V to 5.5V VCC
range. The charge pump operates in discontinuous
mode; if the output voltages are less than 5.5V, the
charge pump is enabled, and if the output voltages
exceed 5.5V, the charge pump is disabled. Each
charge pump requires a flying capacitor (C1, C2) and a
reservoir capacitor (C3, C4) to generate the V+ and V-
supplies (Figure 1).
RS-232 Transmitters

The transmitters are inverting level translators that con-
vert CMOS-logic levels to ±5.0V EIA/TIA-232 levels.
The MAX3385E transmitters guarantee a 250kbps data
rate with worst-case loads of 3kΩin parallel with 1000pF,
providing compatibility with PC-to-PC communication
software (such as LapLink™). Transmitters can be paral-
leled to drive multiple receivers or mice.
The MAX3385E’s transmitters are disabled and the out-
puts are forced into a high-impedance state when the
device is in shutdown (SHDN= GND). The MAX3385E
permits the outputs to be driven up to ±12V in shut-
down.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or VCC.
RS-232 Receivers

The receivers convert RS-232 signals to CMOS-logic
output levels (Table 1).
Shutdown Mode

Supply current falls to less than 1µA in shutdown mode
(SHDN= low). When shut down, the device’s charge
pumps are shut off, V+ is pulled down to VCC, V- is
pulled to ground, and the transmitter outputs are dis-
abled (high impedance). The time required to exit shut-
SHDN
High-Z
T_OUT

Active
Active
R_OUT

Active
MAX3385E
R_ INR_ OUT
C2-
C2+
C1-
C1+VCC
C1
C2
0.1μF
VCC
SHDN
T_ OUTT_ IN
GND
VCC7k150pF
MAX3385E
R_ INR_ OUT
C2-
C2+
C1-
C1+VCC3kC33kC1
C2
0.1μF
VCC
SHDN
T_ OUTT_ IN
GND
VCC3k2500pF
MINIMUM SLEW-RATE TEST CIRCUITMAXIMUM SLEW-RATE TEST CIRCUIT

Figure 1. Slew-Rate Test Circuits
Table 1. Shutdown Truth Table

Laplink is a trademark of Traveling Software.
down is typically 100µs, as shown in Figure 2. Connect
SHDNto VCCif the shutdown mode is not used.
±15kV ESD Protection

As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The driver outputs and receiver inputs of the
MAX3385E have extra protection against static electric-
ity. Maxim’s engineers have developed state-of-the-art
structures to protect these pins against ESD of ±15kV
without damage. The ESD structures withstand high
ESD in all states: normal operation, shutdown, and
powered down. After an ESD event, Maxim’s “E” ver-
sions keep working without latchup, whereas compet-
ing RS-232 products can latch and must be powered
down to remove latchup.
ESD protection can be tested in various ways; the
transmitter outputs and receiver inputs of this product
family are characterized for protection to the following
limits:±15kV using the Human Body Model±8kV using the contact-discharge method specified
in IEC 1000-4-2±15kV using IEC 1000-4-2’s air-gap method.
ESD Test Conditions

ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Human Body Model

Figure 3a shows the Human Body Model, and Figure
3b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩresistor.
IEC 1000-4-2

The IEC 1000-4-2 standard covers ESD testing and per-
formanceof finished equipment; it does not specifically
refer to integrated circuits. The MAX3385E helps you
design equipment that meets Level 4 (the highest level) of
IEC 1000-4-2, without the need for additional ESD-pro-
tection components.
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2, because series resistance is
lower in the IEC 1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 1000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 4a shows the IEC 1000-4-2 model, and
Figure 4b shows the current waveform for the 8kV IEC
1000-4-2 Level 4 ESD contact-discharge test.
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method con-
nects the probe to the device before the probe is ener-
gized.
Machine Model

The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. Of course, all pins require this protec-
tion during manufacturing, not just RS-232 inputs and
outputs. Therefore, after PC board assembly, the
Machine Model is less relevant to I/O ports.
Applications Information
Capacitor Selection

The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
can be used. The charge pump requires 0.1µF capaci-
tors for 3.3V operation. For other supply voltages, refer
to Table 2 for required capacitor values. Do not use val-
MAX3385E
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver

40μs/div
SHDN
T2OUT
T1OUT
5V/div
2V/div
VCC = 3.3V
C1–C4 = 0.1μF
Figure 2. Transmitter Outputs Exiting Shutdown or
Powering Up
C1, CBYPASS
(µF)

C2, C3, C4
(µF)
3.0 to 3.6
4.5 to 5.5
VCC
(V)

3.0 to 5.5
Table 2. Required Minimum Capacitance
Values
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