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Part: MAX3293AUT-T
Category:
Interface and Interconnect
Description: MAX3293, MAX3294, MAX3295 20Mbps, +3.3V, SOT23, RS-485/RS-422 Transmitters
Company: Maxim Integrated Products
Datasheet: Download MAX3293AUT-T datasheet File size : 232 kB
Request For quote: Find where to buy MAX3293AUT-T
Datasheet text preview:
19-2770; Rev 0; 2/03
20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters
General Description
T h e MAX3293/MAX3294/MAX3295 low-power, highspeed transmitters for RS-485/RS-422 communication o p e r a t e from a single +3.3V power supply. These d e v i c e s contain one differential transmitter. The M A X 3 2 9 5 transmitter operates at data rates up to 20Mbps, with an output skew of less than 5ns, and a guaranteed driver propagation delay below 25ns. The M A X 3 2 9 3 (250kbps) and MAX3294 (2.5Mbps) are slew-rate limited to minimize EMI and reduce reflections caused by improperly terminated cables. The MAX3293/MAX3294/MAX3295 output level is guaranteed at +1.5V with a standard 54 load, compliant with RS-485 specifications. The transmitter draws 5mA o f supply current when unloaded, and 1µA in lowpower shutdown mode (DE = GND). Hot-swap circuitry eliminates false transitions on the data cable during circuit initialization or connection to a live backplane, and short-circuit current limiting and thermalshutdown circuitry protect the driver against excessive power dissipation. T h e MAX3293/MAX3294/MAX3295 are offered in a 6-pin SOT23 package, and are specified over the automotive temperature range. o Space-Saving 6-Pin SOT23 Package o 250kbps/2.5Mbps/20Mbps Data Rates Available o Operate from a Single +3.3V Supply o ESD Protection ±9kV--Human Body Model o Slew-Rate Limited for Errorless Data Transmission (MAX3293/MAX3294) o 1µA Low-Current Shutdown Mode o -7V to +12V Common-Mode Input Voltage Range o Current Limiting and Thermal Shutdown for Driver-Overload Protection o Hot-Swap Inputs for Telecom Applications o Automotive Temperature Range (-40°C to +125°C)
Features
MAX3293/MAX3294/MAX3295
Ordering Information
PART MAX3293AUT-T MAX3294AUT-T MAX3295AUT-T TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C PINPACKAGE 6 SOT23-6 6 SOT23-6 6 SOT23-6
Applications
RS-485/RS-422 Communications Clock Distribution Telecom Equipment Automotive Security Equipment Point-of-Sale Equipment Industrial Control
Selector Guide
PART MAX3293AUT-T MAX3294AUT-T MAX3295AUT-T MAXIMUM DATA RATE (Mbps) 0.25 2.5 20 SLEW-RATE LIMITED Yes Yes No TOP MARK ABNI ABNJ ABNK
Pin Configuration
TOP VIEW
DI 1 6 Y
DI DE
Typical Operating Circuit
120 Z D Y R RO
VCC 2
MAX3293 MAX3294 MAX3295
5
GND
DE 3
4
Z
MAX3293 MAX3294 MAX3295
MAX3280E MAX3281E MAX3283E MAX3284E
SOT23-6
________________________________________________________________ Maxim Integrated Products
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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.
20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters MAX3293/MAX3294/MAX3295
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.) Supply Voltage (VCC)....+6V DE, DI .....-0.3V to +6V Y, Z .......-7V to +12.5V Maximum Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 6.25mW/°C above +70°C).........500mW Operating Temperature Ranges MAX32_ _EEUT.....-40°C to +85°C MAX32_ _EAUT ...........-40°C to +125°C Storage Temperature Range .....-65°C to +160°C Junction Temperature .....+160°C Lead Temperature (soldering, 10s) .........+300°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.
ELECTRICAL CHARACTERISTICS
(VCC = +3.3V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Notes 1, 2)
PARAMETER POWER SUPPLY Supply Voltage Supply Current in Normal Operation Supply Current in Shutdown Mode DRIVER Figure 1, DE = VCC, DI = GND or VCC R = 50 (RS-422), TA +85°C R = 27 (RS-485), TA +85°C 2.0 1.5 VCC V VCC 0.2 -1 +3 0.2 V V V VCC IQ ISHDN No load, DI = VCC or GND, DE = VCC No load, DE = GND 1 3.135 3.300 3.465 5 10 V mA µA SYMBOL CONDITIONS MIN TYP MAX UNITS
Differential Driver Output
VOD
Change in Magnitude of Differential Output Voltage Driver Common-Mode Output Voltage Change in Magnitude of CommonMode Voltage DRIVER LOGIC Input High Voltage Input Low Voltage Input Current
VOD VOC VOC
Figure 1, R = 27 or 50, DE = VCC (Note 3) Figure 1, R = 27 or 50, DE = VCC, DI = VCC or GND Figure 1, R = 27 or 50 (Note 3)
VIH VIL IIN
DE, DI DE, DI DE, DI Y, Z DE = GND, VCC = GND or +3.3V VIN = +12V VIN = -7V
2.0 0.8 -2 -20 -20 +25 -25 -250 +250 160 40 +2 +20
V V µA
Output Leakage
IO
µA +20 mA mA °C °C kV
Driver Short-Circuit Foldback Output Current Driver Short-Circuit Output Current Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis ESD Protection
IO S F D IOSD TTS TTSH
(VCC - 1V) VOUT +12V, output high -7V VOUT 1V, output high 0 VOUT +12V, output low -7V VOUT VCC, output high
Y, Z
Human Body Model
±9
2
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters
SWITCHING CHARACTERISTICS (MAX3293)
(VCC = +3.3V ±5%, TA = +25°C, unless otherwise noted. Typical values are at VCC = +3.3V.)
PARAMETER Driver Propagation Delay Driver Differential Output Rise or Fall Time Driver Output Skew Differential Driver Output Skew Maximum Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Device-to-Device Propagation Delay Matching tZH tZL tLZ tHZ SYMBOL tPLH tPHL tR tF tSKEW t DSKEW CONDITIONS Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF, tSKEW = | tPLH - tPHL | (Note 5) Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Same power supply, maximum temperature difference between devices = +30°C (Note 5) MIN 400 400 400 400 -400 -100 250 2000 2000 1000 1000 900 TYP MAX 1300 1300 1200 1200 +400 +100 UNITS ns ns ns ns kbps ns ns ns ns ns
MAX3293/MAX3294/MAX3295
SWITCHING CHARACTERISTICS (MAX3294)
(VCC = +3.3V ±5%, TA = +25°C, unless otherwise noted. Typical values are at VCC = +3.3V.)
PARAMETER Driver Propagation Delay Driver Differential Output Rise or Fall Time Driver Output Skew Differential Driver Output Skew Maximum Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Device-to-Device Propagation Delay Matching tZH tZL tLZ tHZ SYMBOL tPLH tPHL tR tF tSKEW t DSKEW CONDITIONS Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF, tSKEW = | tPLH - tPHL | (Note 5) Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Same power supply, maximum temperature difference between devices = +30°C (Note 5) MIN 24 24 10 10 -40 -6 2.5 400 400 100 100 46 TYP MAX 70 70 70 70 +40 +6 UNITS ns ns ns ns Mbps ns ns ns ns ns
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