Datasheet

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General Description

The MAX3362 low-power, high-speed transceiver for

RS-485/RS-422 communication operates from a single

+3.3V power supply. The device contains one differen-

tial transceiver consisting of a line driver and receiver.

The transceiver operates at data rates up to 20Mbps,

with an output skew of less than 6ns. Driver and receiv-

er propagation delays are guaranteed below 50ns. This

fast switching and low skew make the MAX3362 ideal

for multidrop clock/data distribution applications.

The output level is guaranteed at +1.5V with a standard

54Ω load, compliant with RS-485 specifications. The

transceiver draws 1.7mA supply current when

unloaded or fully loaded with the drivers disabled.

Additionally, the MAX3362 has a low-power shutdown

mode, reducing the supply current to 1µA.

The MAX3362 has a 1/8-unit-load receiver input imped-

ance, allowing up to 256 transceivers on the bus. The

MAX3362 is designed for half-duplex communication.

The device has a hot-swap feature that eliminates false

transitions on the data cable during circuit initialization.

The drivers are short-circuit current limited, and a ther-

mal shutdown circuit protects against excessive power

dissipation.

The MAX3362 is available in an 8-pin SOT package

and specified over industrial and automotive tempera-

ture ranges.

Applications

Clock/Data Distribution

Telecom Equipment

Security Equipment

Point-of-Sale Equipment

Industrial Controls

Features

♦ Space-Saving 8-Pin SOT Package

♦ Guaranteed 20Mbps Data Rate

♦ Operates from a Single +3.3V Supply

♦ 6ns (max) Transmitter and Receiver Skew

♦ Hot-Swap Feature

♦ Interoperable with +5V Logic

♦ Allows up to 256 Transceivers on the Bus

♦ 1µA Low-Power Shutdown Mode

♦ 1.7mA Operating Supply Current

♦ -7V to +12V Common-Mode Range

♦ Current Limiting and Thermal Shutdown

♦ Half-Duplex Operation

♦ Automotive Temperature Range Variants

MAX3362

3.3V, High-Speed, RS-485/RS-422 Transceiver in

SOT Package

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-2218; Rev 3; 3/07

Indicates an RoHS-compliant part.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PA RT

T EM P

R A NG E

PIN-

PA CK A G E

T O P

M A RK

PK G

C O DE

M AX3362E KA-T - 40°C to + 85°C 8 SOT23- 8 AAJL S 8-1

M AX3362AKA-T - 40°C to + 125°C 8 SOT23- 8 AALL S 8-1

M AX3362E KA#T - 40°C to + 85°C 8 SOT23- 8#AEP H S 8-1

M AX3362AKA#T - 40°C to + 125°C 8 SOT23- 8#AEP P S 8-1

MAX3362

AABAB

120Ω 120Ω

DI DE RO

Typical Operating Circuit

Pin Configuration and Functional Diagram appear at end of

data sheet.

Summary of content (14 pages)

PAGE 1
9-2218; Rev 3; 3/07 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package Features ♦ Space-Saving 8-Pin SOT Package ♦ Guaranteed 20Mbps Data Rate ♦ Operates from a Single +3.3V Supply ♦ 6ns (max) Transmitter and Receiver Skew ♦ Hot-Swap Feature ♦ Interoperable with +5V Logic ♦ Allows up to 256 Transceivers on the Bus ♦ 1µA Low-Power Shutdown Mode ♦ 1.
PAGE 2
MAX3362 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package ABSOLUTE MAXIMUM RATINGS All voltages with respect to GND. VCC, RE, DE, DI ......................................................-0.3V to +6V Receiver Input Voltages, Driver Output Voltages (A, B) .......................................................-8V to +13V Receiver Input Current, Driver Output Current (A, B) .................................................................250mA |VA - VB|...............................................
PAGE 3
.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package (VCC = +3.3V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.
PAGE 4
MAX3362 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package SWITCHING CHARACTERISTICS (continued) (VCC = +3.3V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.
PAGE 5
3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package 25 20 15 10 -15 -20 -25 5 0 0.5 1.0 1.5 2.0 2.5 3.0 0 3.5 3.23 0.5 1.0 1.5 2.0 2.5 3.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 3.5 TEMPERATURE (°C) RECEIVER OUTPUT LOW VOLTAGE vs. TEMPERATURE DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE 0.02 0.01 45 30 15 2.2 2.4 2.6 2.8 3.0 DRIVER OUTPUT CURRENT vs. DRIVER OUTPUT LOW VOLTAGE DRIVER OUTPUT CURRENT vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25°C, unless otherwise noted.) SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE 1.0 0.8 0.6 0.4 0.2 0 35 MAX3362 toc12 MAX3362 toc11 0.26 0.24 0.22 0.20 0.18 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0 RECEIVER PROPAGATION DELAY (ns) DRIVER OUTPUT SKEW (ns) 1.2 RECEIVER PROPAGATION DELAY vs. TEMPERATURE DRIVER OUTPUT SKEW vs. TEMPERATURE MAX3362 toc10 1.
PAGE 7
3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package PIN NAME DESCRIPTION 1 RO Receiver Output. RO is high if the receiver input differential (A-B) ≥ 200mV and the receiver is enabled (RE is low). RO is low if the receiver input differential (A-B) ≤ -200mV and the receiver is enabled. 2 RE Receiver Output Enable. Driving RE low enables RO. RO is high impedance when RE is high. Drive RE high and DE low (disable both receiver and driver outputs) to enter low-power shutdown mode.
PAGE 8
MAX3362 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package S1 0 or 3V OUT D RL = 500Ω CL = 50pF GENERATOR 50Ω VCC VCC/2 IN 0 tPDSH, tPDZH 0.25V VOM = (VOH) /2 VCC tPDHZ OUT VOL Figure 5. Driver Enable and Disable Times (tPDSH, tPDZH, tPDHS, tPDHZ) VID GENERATOR OUT R 50Ω CL = 15pF VOM = 1.5V VCC 2 0 3.0V IN OUT VOL 1.5V 1.5V tPRLH tPRHL VOM 0 VCC VOM 0 Figure 6.
PAGE 9
3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package S3 S1 RL = 1kΩ VID -1.5V MAX3362 1.5V VCC R CL GENERATOR S2 50Ω 3V 3V 1.5V 1.5V IN 0 tPRZH tPRSH OUT IN 0 tPRZL tPRSL VOH VOC 1.5V OUT 0 S1 OPEN S2 CLOSED S3 = 1.5V VOL S1 CLOSED S2 OPEN S3 = -1.5V 3V 3V 1.5V 1.5V IN 0 tPRHZ IN 0 tPRLZ VOH 0.25V VOH OUT OUT 0 S1 OPEN S2 CLOSED S3 = 1.5V 0.25V 0 S1 CLOSED S2 OPEN S3 = -1.5V Figure 7.
PAGE 10
MAX3362 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package Table 1. Transmitter Functional Table Drive RE high and DE low (disable both receiver and driver outputs) to enter low-power shutdown mode. TRANSMITTING INPUTS Hot-Swap Capability OUTPUTS RE DE DI A B X 1 1 1 0 X 1 0 0 1 0 0 X High Z High Z 1 0 X Shutdown Table 2.
PAGE 11
3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package MAX3362 VCC 10μs TIMER TIMER 8kΩ DE (HOT SWAP) DE 30μA 300μA M1 M2 Figure 8. Simplified Structure of the Driver Enable Input (DE) 3.3V 3.3V VCC 1kΩ VCC 0 Y A TIN VCC OR GND 0.1kΩ 10mV/div AC-COUPLED 50pF B 10mV/div AC-COUPLED Z 1kΩ 10mV/div A-B 10μs/div Figure 9. Differential Power-Up Glitch (Hot Swap) Figure 10. Differential Power-Up Glitch (0.
PAGE 12
MAX3362 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package 3.3V 3.3V VCC 0 A 10mV/div AC-COUPLED 0 A 50mV/div AC-COUPLED B B 50mV/div AC-COUPLED 10mV/div AC-COUPLED 10mV/div A-B 10mV/div A-B 200ns/div 1μs/div Figure 11. Differential Power-Up Glitch (1V/µs) connected to the line and is powered up the driver must not cause the differential signal to drop below 200mV. Figures 10, 11, and 12 show the results of the MAX3362 during power-up for three different VCC ramp rates (0.
PAGE 13
3.
PAGE 14
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 www.maxim-ic.com/packages.) SOT23, 8L.EPS MAX3362 3.3V, High-Speed, RS-485/RS-422 Transceiver in SOT Package MARKING 0 0 PACKAGE OUTLINE, SOT-23, 8L BODY 21-0078 H 1 1 Revision History Pages changed at Rev 3: 1, 13, 14 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.