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MAX3032ECSE+中文资料

General Description

The MAX3030E–MAX3033E family of quad RS-422transmitters send digital data transmission signals over twisted-pair balanced lines in accordance with TIA/EIA-422-B and ITU-T V.11 standards. All transmitter outputs are protected to ±15kV using the Human Body Model.The MAX3030E–MAX3033E are available with either a 2Mbps or 20Mbps guaranteed baud rate. The 2Mbps baud rate transmitters feature slew-rate-limiting to mini-mize EMI and reduce reflections caused by improperly terminated cables.

The 20Mbps baud rate transmitters feature low-static current consumption (I CC < 100μA), making them ideal for battery-powered and power-conscious applications.They have a maximum propagation delay of 16ns and a part-to-part skew less than 5ns, making these devices ideal for driving parallel data. The MAX3030E–MAX3033E feature hot-swap capability that eliminates false transitions on the data cable during power-up or hot insertion.

The MAX3030E–MAX3033E are low-power, ESD-pro-tected, pin-compatible upgrades to the industry-stan-dard 26LS31 and SN75174. They are available in space-saving 16-pin TSSOP and SO packages.

Applications

Telecom Backplanes V.11/X.21 Interface Industrial PLCs Motor Control

Features

o Meet TIA/EIA-422-B (RS-422) and ITU-T V.11Recommendation o ±15kV ESD Protection on Tx Outputs o Hot-Swap Functionality

o Guaranteed 20Mbps Data Rate (MAX3030E,MAX3032E)o Slew-Rate-Controlled 2Mbps Data Rate (MAX3031E, MAX3033E)o Available in 16-Pin TSSOP and Narrow SO Packages o Low-Power Design (<330μW, V CC = 3.3V Static) o +3.3V Operation

o Industry-Standard Pinout o Thermal Shutdown

MAX3030E–MAX3033E

±15kV ESD-Protected, 3.3V Quad

RS-422 Transmitters

________________________________________________________________Maxim Integrated Products 1

Ordering Information

19-2671; Rev 0; 10/02

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at https://www.sodocs.net/doc/9012374736.html,.

Pin Configurations

M A X 3030E –M A X 3033E

±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

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.

(All Voltages Are Referenced to Device Ground, Unless Otherwise Noted)

V CC ........................................................................................+6V EN1&2, EN3&4, EN, EN ............................................-0.3V to +6V DI_............................................................................-0.3V to +6V DO_+, DO_- (normal condition).................-0.3V to (V CC + 0.3V)DO_+, DO_- (power-off or three-state condition).....-0.3V to +6V Driver Output Current per Pin.........................................±150mA

Continuous Power Dissipation (T A = +70°C)

16-Pin SO (derate 8.70mW/°C above +70°C)..............696mW 16-Pin TSSOP (derate 9.40mW/°C above +70°C).......755mW Operating Temperature Ranges

MAX303_EC_......................................................0°C to +70°C MAX303_EE_...................................................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+300°C

MAX3030E–MAX3033E

±15kV ESD-Protected, 3.3V Quad

RS-422 Transmitters

SWITCHING CHARACTERISTICS—MAX3030E, MAX3032E

SWITCHING CHARACTERISTICS —MAX3031E, MAX3033E

M A X 3030E –M A X 3033E

±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 4_______________________________________________________________________________________

SWITCHING CHARACTERISTICS —MAX3031E, MAX3033E (continued)

(3V ≤V CC ≤3.6V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +3.3V and T A = +25°C.)

Note 1:All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device

ground, unless otherwise noted.

Note 2:?V OD and ?V OC are the changes in V OD and V OC , respectively, when DI changes state. Note 3:Only one output shorted at a time.

Note 4:This input current is for the hot-swap enable (EN_, EN, EN ) inputs and is present until the first transition only. After the first

transition, the input reverts to a standard high-impedance CMOS input with input current I LEAK .

DIFFERENTIAL OUTPUT VOLTAGE

vs. OUTPUT CURRENT

OUTPUT CURRENT (mA)

D I F F

E R E N T I A L O U T P U T V O L T A G E (V )

3400

120

OUTPUT CURRENT

vs. TRANSMITTER OUTPUT LOW VOLTAGE

M A X 3030E t o c 02

OUTPUT LOW VOLTAGE (V)

O U T P U T C U R R E N T (m A )

100

150

20000

OUTPUT CURRENT

vs. TRANSMITTER OUTPUT HIGH VOLTAGE

M A X 3030E t o c 03

OUTPUT HIGH VOLTAGE (V)

O U T P U T C U R R E N T (m A )

507510012515000

Typical Operating Characteristics

(V CC = +3.3V and T A = +25°C, unless otherwise noted.)

MAX3030E–MAX3033E

±15kV ESD-Protected, 3.3V Quad

RS-422 Transmitters

_______________________________________________________________________________________5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

S U P P L Y C U R R E N T (μA )

80100

MAX3030E/MAX3032E

SUPPLY CURRENT vs. DATA RATE

DATA RATE (bps)

S U P P L Y C U R R E N T (m A )

10M

100k

10k

510152025300

0.1k

100M

MAX3031E/MAX3033E

SUPPLY CURRENT vs. DATA RATE

DATA RATE (bps)

S U P P L Y C U R R E N T

(m A )

100k

10k

0.5

1.0

1.5

2.0

2.5

0.1k

10M

MAX3030E/MAX3032E

SUPPLY CURRENT vs. DATA RATE

DATA RATE (bps)

S U P P L Y C U R R E N T (

m A )

10M

100k

10k

100

110

120130

800.1k

100M

MAX3031E/MAX3033E

SUPPLY CURRENT vs. DATA RATE

DATA RATE (bps)

S U P P L Y C U R R E N T (m A )

100k

10k

100

880.1k

10M

MAX3030E

DRIVER PROPAGATION DELAY

(LOW TO HIGH)

MAX3030E toc09

10ns/div

DIFFERENTIAL OUTPUT 2V/div

DI_1V/div

MAX3030E

DRIVER PROPAGATION DELAY

(HIGH TO LOW)

MAX3030E toc10

10ns/div

DIFFERENTIAL OUTPUT 2V/div

DI_1V/div

MAX3031E

DRIVER PROPAGATION DELAY

(LOW TO HIGH)

MAX3030E toc11

20ns/div

DIFFERENTIAL OUTPUT 2V/div

DI_1V/div

MAX3031E

DRIVER PROPAGATION DELAY

(HIGH TO LOW)

MAX3030E toc12

20ns/div

DIFFERENTIAL OUTPUT 2V/div

DI_1V/div

Typical Operating Characteristics (continued)

(V CC = +3.3V and T A = +25°C, unless otherwise noted.)

M A X 3030E –M A X 3033E

±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters

ENABLE RESPONSE TIME

MAX3030E toc13

20ns/div ENABLE 1V/div

DIFFERENTIAL OUTPUT 2V/div

MAX3033E EYE DIAGRAM

MAX3030E toc14

100ns/div

DO_+1V/div

DO_-1V/div

Typical Operating Characteristics (continued)

(V CC = +3.3V and T A = +25°C, unless otherwise noted.)

MAX3030E–MAX3033E

±15kV ESD-Protected, 3.3V Quad

RS-422 Transmitters

_______________________________________________________________________________________

Test Circuits and Timing Diagrams

Time Test Circuit

Figure 4. Driver Enable/Disable Delays Test Circuit

Figure 3. Differential Driver Propagation Delay and Transition Waveform

M A X 3030E –M A X 3033E

Detailed Description

The MAX3030E –MAX3033E are high-speed quad RS-422 transmitters designed for digital data transmission over balanced lines. They are designed to meet the requirements of TIA/EIA-422-B and ITU-T V.11. The MAX3030E –MAX3033E are available in two pinouts to be compatible with both the 26LS31 and SN75174industry-standard devices. Both are offered in 20Mbps and 2Mbps baud rate. All versions feature a low-static current consumption (I CC < 100μA) that makes them ideal for battery-powered and power-conscious appli-cations. The 20Mbps version has a maximum propaga-tion delay of 16ns and a part-to-part skew less than 5ns, allowing these devices to drive parallel data. The 2Mbps version is slew-rate-limited to reduce EMI and reduce reflections caused by improperly terminated cables.

Outputs have enhanced ESD protection providing ±15kV tolerance. All parts feature hot-swap capability that eliminates false transitions on the data cable dur-ing power-up or hot insertion.

±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 have extra protection against static electricity. Maxim ’s engi-neers 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 and power-down. After an ESD event, the MAX3030E –MAX3033E keep working without latchup.ESD protection can be tested in various ways; the

transmitter outputs of this product family are character-ized for protection to ±15kV using the Human Body Model. Other ESD test methodologies include IEC10004-2 Contact Discharge and IEC1000-4-2 Air-Gap Discharge (formerly IEC801-2).

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 8 shows the Human Body Model, and Figure 9shows the current waveform it generates when dis-charged into 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 1.5k ?resistor.

±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 8_______________________________________________________________________________________

Figure 7. Power-Off Measurements

Test Circuits and

Timing Diagrams (continued)

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 inputs and outputs.Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.

Hot Swap

When circuit boards are plugged into a “hot ” back-plane, there can be disturbances to the differential sig-nal levels that could be detected by receivers connected to the transmission line. This erroneous data could cause data errors to an RS-422 system. To avoid this, the MAX3030E –MAX3033E have hot-swap capa-ble inputs.

When a circuit board is plugged into a “hot ” backplane,there is an interval during which the processor is going through its power-up sequence. During this time, the processor ’s output drivers are high impedance and are unable to drive the enable inputs of the MAX3030E –MAX3033E (EN, EN , EN_) to defined logic levels.Leakage currents from these high-impedance drivers,of as much as 10μA, could cause the enable inputs of the MAX3030E –MAX3033E to drift high or low.Additionally, parasitic capacitance of the circuit board could cause capacitive coupling of the enable inputs to either G ND or V CC . These factors could cause the enable inputs of the MAX3030E –MAX3033E to drift to levels that may enable the transmitter outputs. To avoid this problem, the hot-swap input provides a method of holding the enable inputs of the MAX3030E –MAX3033E in the disabled state as V CC ramps up. This hot-swap input is able to overcome the leakage currents and par-asitic capacitances that can pull the enable inputs to the enabled state.

Hot-Swap Input Circuitry

In the MAX3030E –MAX3033E, the enable inputs feature hot-swap capability. At the input there are two NMOS devices, M1 and M2 (Figure 10). When V CC is ramping up from zero, an internal 6μs timer turns on M2 and sets the SR latch, which also turns on M1. Transistors M2, a 2mA current sink, and M1, a 100μA current sink, pull EN to GND through a 5.6k ?resistor. M2 is designed to pull the EN input to the disabled state against an external parasitic capacitance of up to 100pF that is trying to enable the EN input. After 6μs, the timer turns M2 off and M1 remains on, holding the EN input low against three-state output leakages that might enable EN. M1 remains on until an external source overcomes the required input

current. At this time the SR latch resets and M1 turns off.When M1 turns off, EN reverts to a standard, high-impedance CMOS input. Whenever V CC drops below 1V, the hot-swap input is reset. The EN1&2 and EN3&4input structures are identical to the EN input. For the EN input, there is a complementary circuit employing two PMOS devices pulling the EN input to V CC .

Hot-Swap Line Transient

The circuit of Figure 11 shows a typical offset termina-tion used to guarantee a greater than 200mV offset when a line is not driven. The 50pF capacitor repre-MAX3030E–MAX3033E

±15kV ESD-Protected, 3.3V Quad

RS-422 Transmitters

_______________________________________________________________________________________

Figure 10. Simplified Structure of the Driver Enable Pin (EN)

Figure 11. Differential Power-Up Glitch (Hot Swap)

M A X 3030E –M A X 3033E

sents the minimum parasitic capacitance that would exist in a typical application. In most cases, more capacitance exists in the system and reduces the mag-nitude of the glitch. During a “hot-swap ” event when the driver is connected to the line and is powered up, the driver must not cause the differential signal to drop below 200mV (Figures 12 and 13).

Operation of Enable Pins

The MAX3030E –MAX3033E family has two enable-func-tional versions.

The MAX3030E/MAX3031E are compatible with 26LS31, where the two enable signals control all four transmitters (global enable).

The MAX3032E/MAX3033E are compatible with the SN75174. EN1&2 controls transmitters 1 and 2, and EN 3&4 controls transmitters 3 and 4 (dual enable).

Typical Applications

The MAX3030E –MAX3033E offer optimum performance when used with the MAX3094E/MAX3096 3.3V quad differential line receivers. Figure 14 shows a typical RS-422 connection for transmitting and receiving data.

±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 10______________________________________________________________________________________

4μs/div

Figure 12. Differential Power-Up Glitch (0.1V/μs) 1.0μs/div

DO_+DO_+ - DO_-DO_-

V 1V/div

Figure 13. Differential Power-Up Glitch (1V/μs)

EN TX1TX4MODE

0Active Active All transmitters active 1High-Z High-Z High-Z All transmitters disabled 0Active Active All transmitters active 1

Active

All transmitters active

Table 1. MAX3030E/MAX3031E Transmitter Controls

Table 2. MAX3032E/MAX3033E Transmitter Controls

MAX3030E–MAX3033E

±15kV ESD-Protected, 3.3V Quad

RS-422 Transmitters

______________________________________________________________________________________11

Figure 14. Typical Connection of a Quad Transmitter and Quad Receiver as a Pair

M A X 3030E –M A X 3033E

±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 12______________________________________________________________________________________

Figure 15. MAX3030E/MAX3031E Functional Diagram

Figure 16. MAX3032E/MAX3033E Functional Diagram

Chip Information

TRANSISTOR COUNT: 1050PROCESS: BiCMOS

MAX3030E–MAX3033E

±15kV ESD-Protected, 3.3V Quad

RS-422 Transmitters

______________________________________________________________________________________13

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to https://www.sodocs.net/doc/9012374736.html,/packages .)

M A X 3030E –M A X 3033E

±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

14____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600?2002 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to https://www.sodocs.net/doc/9012374736.html,/packages .)

MAX3032ECSE+中文资料

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