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| a FEATURES Eight Single Ended Line Drivers in One Package Meets EIA Standard RS-232E, RS-423A and CCITT V.10/X.26 Resistor Programmable Slew Rate Wide Supply Voltage Range Low Power CMOS 3-State Outputs TTL/CMOS Compatible Inputs Output Short Circuit Protection Available in 28-Pin DIP/PLCC Low Power Replacement for UC5170C APPLICATIONS High Speed Communication Computer I-O Ports Peripherals High Speed Modems Printers Logic Level Translation Octal, RS-232/RS-423 Line Driver ADM5170 FUNCTIONAL BLOCK DIAGRAM ADM5170 AI A AO BI B BO CI C CO DI D DO EI E EO FI F FO GENERAL DESCRIPTION The ADM5170 is an octal line driver suitable for digital communication systems with data rates up to 116 kB/s. Input TTL or CMOS signal levels are inverted and translated into either EIA RS-232E or RS-423A signal levels depending on the status of the Mode Select inputs MS+ and MS-. With both Mode Select inputs at GND, RS-423 operation is selected while with MS+ connected to VDD and MS- connected to V SS, RS-232 operation is selected. The output slew rates may be controlled using an external resistor connected between the SRA (Slew Rate Adjust) pin and GND. Resistor values between 2 k and 10 k may be selected giving a slew rate which can be adjusted from 10 V/s to 2.2 V/s. This adjustment of the slew rate allows tailoring of the output characteristics to suit the interface cable being used. The outputs may be disabled using the EN (Enable Input). This feature permits sharing of a common output line. The ADM5170 is fabricated on an advanced CMOS process featuring low power consumption. In the disabled state the power consumption reduces from 500 mW to 40 mW. The ADM5170 is available in both 28-pin DIP and 28-lead PLCC packages. Inputs EN 0 0 1 1 GI G GO HI EN MS+ MS- SRA H HO RS-232/RS-423 MODE SELECT SLEW RATE CONTROL Truth Table Outputs EIA RS-232E1 (VDD - 3 V) (VSS - 3 V) High Z Data 0 1 X RS-423A 5 V to 6 V -5 V to -6 V High Z Minimum Output Level REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 = V 10%, V =0 ADM5170-SPECIFICATIONS (10V k.+10Specifications=T-10toVT 10% V, MS+ = MS-noted.)V, R All unless otherwise DD SS MIN MAX SRA = Parameter POWER REQUIREMENTS VDD Range VSS Range IDD (Disabled) IDD (Enabled) ISS (Disabled) ISS (Enabled) DIGITAL INPUTS Input Logic Threshold High, V INH Input Logic Threshold Low, V INL Input Clamp Voltage, V INK Input High Level Current, I INH Input Low Level Current, I INL OUTPUTS RS-423A Outputs High Level Output Voltage Min 9 -9 Typ Max 15 -15 4 36 -4 -36 Units V V mA mA mA mA V V V A A Test Conditions/Comments 2 25 -2 -23 2.0 -1.1 -1 EN = High, RL = , EN = 0 V EN = High RL = , EN = 0 V 0.8 -1.8 1 IIN = -15 mA VINH = 2.4 V VINL = 0.4 V EN = 0.8 V, MS+ = MS- = 0 V RL = , VIN = 0.8 V RL = 3 k, VIN = 0.8 V RL = 450 , VIN = 0.8 V RL = , VIN = 2.0 V RL = 3 k, VIN = 2.0 V RL = 450 , VIN = 2.0 V RL = 450 , VBAL = VOH- VOL EN = 0.8 V, MS+ = VDD, MS- = VSS RL = , VIN = 0.8 V RL = 3 k, VIN = 0.8 V RL = , VIN = 2.0 V RL = 3 k, VIN = 2.0 V EN = 2.0 V, VO = 6 V, VDD= 15 V, VSS = -15 V VIN = 0 V, EN = 0 V VIN = 5 V, EN = 0 V Low Level Output Voltage 5.0 5.0 4.5 -5.0 -5.0 -4.5 Output Balance, VBAL RS-232 Outputs High Level Output Voltage Low Level Output Voltage Off-State Output Current, I OZ Short Circuit Current, IOS Specifications subject to change without notice. 5.3 5.3 5.2 -5.3 -5.6 -5.4 0.05 7.6 7.6 -7.7 -7.7 50 40 6.0 6.0 6.0 -6.0 -6.0 -6.0 0.4 VDD VDD VSS VSS 100 100 100 V V V V V V V V V V V A mA mA 7.0 7.0 -7.0 -7.0 -100 15 15 TIMING CHARACTERISTICS unless otherwise noted.) Parameter Output Slew Rate 6.65 Output Slew Rate 1.33 Output to Hi-Z Propagation Delay (Disable) 0.3 0.5 Hi-Z to Valid Output Propagation Delay (Enable) 6.0 7.0 Specifications subject to change without notice. ( VDD = +10 V 10%, VSS = -10 V 10%, MS+ = MS- = 0 V. All Specifications TMIN to TMAX Min Typ 10 2.0 Max 14 3 1.0 1.0 15 15 Units V/s V/s s s s s Test Conditions/Comments Fig 1, Fig 2. RSRA = 2 k, RL = 450 , CL = 50 pF Rising/Falling Edge, tR, tF Fig 1, Fig 2. RSRA = 10 k, RL = 450 , CL = 50 pF Rising/Falling Edge, t R , tF Fig 1, Fig 3. RSRA = 10 k, RL = 450 , CL = 50 pF tHZ tLZ Fig 1, Fig 3. RSRA = 10 k, RL = 450, CL = 50 pF tZH tZL -2- REV. 0 ADM5170 ABSOLUTE MAXIMUM RATINGS* (TA= 25C unless otherwise noted) ORDERING GUIDE Model ADM5170JN ADM5170AN ADM5170JP ADM5170AP Temperature Range 0C to +70C -40C to +85C 0C to +70C -40C to +85C Package Option N-28 N-28 P-28A P-28A VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15 V VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -15 V Input Voltages VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VDD + 0.3 V) Ouput Voltages VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12 V to +12 V Output Short Circuit Duration . . . . . . . . . . . . . . . . . . Continuous Power Dissipation Plastic DIP . . . . . . . . . . . . . . . . . . . . 1250 mW (Derate at 12.5 mW/C above +50C) JA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . 75C/W Power Dissipation PLCC . . . . . . . . . . . . . . . . . . . . . . . 1000 mW (Derate at 10 mW/C above +50C) JA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . 80C/W Operating Temperature Range Commercial (J Version) . . . . . . . . . . . . . . . . . . . . 0C to +70C Industrial (A Version) . . . . . . . . . . . . . . . . . . . . -40C to +85C Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . . . . +300C Vapour Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . +215C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220C *This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM5170 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE VIN INPUT EN 1.5V 1.5V EN MS+ RS-232/RS-423 MODE SELECT MS- SRA RL CL 0.5V VOH 90% OUTPUT VIN = 0V SLEW RATE CONTROL tHZ tZH Figure 1. Timing Test Circuit OUTPUT VIN = 5V VOL 0.5V 90% tLZ VIN tZL tF 10% tR 90% Figure 3. Enable/Disable Timing Waveforms VOUT 90% 10% Figure 2. Rise/Fall Timing Waveforms REV. 0 -3- ADM5170 PIN CONFIGURATIONS DIP NC AO AI BI BO CO CI DI DO EN VSS SRA NC NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 HO 27 HI 26 GI Slew Rate Programming The slew rate for the ADM5170 is controlled by a single resistor connected between the SRA pin and GND. The slew rate is approximately. Slew Rate (V/s) = 20/RSRA (k) Resistors between 2 k and 10 k may be used providing a slew rate which may be varied from 10 V/s to 2.2 V/s. Figure 5 in the Typical Performance Characteristics section shows how the slew rate varies with R SRA while Figure 8 shows how the transition time (10% to 90%) varies with R SRA. Waveshaping of the output allows the user to control the level of interference (near-end crosstalk) which may be coupled to adjacent circuits in an interconnection. The recommended output characteristics for cable length and data rate are given in the EIA RS-423A specifications. Maximum Data Rate (kB/s) = 300/t (for rates from 1 kB/s to 100 kB/s). Cable Length (feet) = 100 X t (Max Length = 4000 ft.) where t is the transition time (in s) for the output to swing from 10% to 90% of its steady state values. The absolute maximum data rate is 100 kB/s and the maximum cable length is limited to 4000 ft. Output Mode Programming The ADM5170 has two programmable output modes which provide different output voltage levels. The low output mode meets the specifications of EIA standards RS-423A while the high output mode meets the RS-232 specifications. The high output mode provides greater output swings and is suitable for driving lines where higher attenuation levels must be tolerated. This mode is selected by connecting the mode select pins to the supplies, MS+ to VDD and MS- to VSS. The low output mode is selected by connecting both mode select pins MS+ and MS- to GND. This mode provides a controlled output swing with lower output levels. Inputs MS+ GND GND VDD VDD X 1 25 GO 24 FO 23 FI 22 EI TOP VIEW (Not to Scale) 21 EO 20 VDD 19 MS+ 18 GND 17 MS- ADM5170 16 NC 15 NC NC = NO CONNECT PLCC NC AO HO AI BI GI HI 4 BO CO CI DI DO 5 6 7 8 9 3 2 1 28 27 26 25 GO 24 FO ADM5170 TOP VIEW (Not to Scale) 23 FI 22 EI 21 EO 20 VDD 19 MS+ EN 10 VSS 11 12 13 14 15 16 17 18 GND SRA NC NC NC MS- NC Outputs Data 0 1 0 1 X Output 5 V to 6 V (RS-423) -5 V to -6 V (RS-423) (VDD - 3 V) (RS-232)1 (VSS + 3 V) (RS-232)1 High Z MS- GND GND VSS VSS X EN 0 0 0 0 1 NC = NO CONNECT PIN FUNCTION DESCRIPTION Mnemonic VDD VSS GND AI . . . H I AO . . . H O EN MS+, MS- Function Power Supply Input, +10 V 10%. Power Supply Input, -10 V 10%. Ground Pin. Must be connected to 0 V. Digital Input to Drivers A to H. RS-232/RS-423 Output from Drivers A to H. Enable Pin. When high, all outputs are 3-stated. Mode Select Inputs. Used to control the output level swing. With MS+ & MS- connected to GND, RS-423A output levels are selected. With MS+ connected to VDD and MS- connected to V SS, RS-232 output levels are developed. Slew Rate Adjust Input. An external resistor (2 k to 10 k) connected between this pin and GND is used to control the Output Slew Rate (10 V/s to 2.2 V/s). Minimum Output Level. Typical Application Circuit A typical application circuit using a single driver in the ADM5170 is shown in Figure 4. This circuit is suitable for either RS-232 or RS-423 communication. An ADM5180 octal receiver is used to translate the signal back to CMOS logic level at the receiving end. VH VL INPUT VDD +V -V RS-232/RS-422A TRANSMISSION EN RSL VSS TIE TO GND FOR RS-232 VH VL 1/8 ADM5180 1/8 ADM5170 SRA Figure 4. RS-232/RS-423A Typical Application Circuit -4- REV. 0 Typical Performance Characteristics-ADM5170 12 5 10 4 TRANSITION TIME - s tr SLEW RATE - V/s 8 tf 3 6 tf tr 2 4 2 1 0 0 2 4 RSRA - k 6 8 10 0 0 2 4 6 RSRA - k 8 10 Figure 5. Typical Slew Rate vs. RSRA Figure 8. Typical Rise/Fall Times (RS-423A Mode) vs. RSRA A1 100 90 20V 100 90 A1 20V 10 0% 10 0% 5V 5V 1s 5V 5V 1s Figure 6. Slew Rate (RSRA = 2 k) Figure 9. Slew Rate (RSRA = 10 k) 15 14 5.6 DRIVER OUTPUT VOLTAGE - V DRIVER OUTPUT VOLTAGE - V 13 12 11 10 9 8 7 9 10 11 VOH/VOL (RL= ) 5.5 VOL (RL= ) VOH (RL= ) 5.4 VOL (RL= 450) 5.3 VOH (RL= 450) VOL (RL= 3k) VOH (RL= 3k) 5.2 12 VDD/VSS - V 13 14 15 5.1 9 10 11 12 13 VDD/ VSS - V 14 15 Figure 7. VOH/VOL vs. VDD/VSS (RS-232 Mode) Figure 10. VOH/VOL vs. VDD/VSS (RS-423 Mode) REV. 0 -5- ADM5170 10 VOH 6 VOL DRIVER OUTPUT VOLTAGE - V DRIVER OUTPUT VOLTAGE - V 8 5 VOH VOL 4 6 3 4 2 2 1 0 0 5 10 15 OUTPUT CURRENT - mA 20 25 0 0 5 10 15 20 25 OUTPUT CURRENT - mA Figure 11. Driver Output Voltage vs. Output Current (RS-232 Mode) Figure 12. Driver Output Voltage vs. Output Current (RS-423 Mode) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead Plastic DIP (N Suffix) 28 15 0.580 (14.73) 0.485 (12.32) 1 1.565 (39.70) 1.380 (35.10) 0.250 (6.35) MAX 0.200 (5.05) 0.125 (3.18) 0.022 (0.558) 0.014 (0.356) 0.100 (2.54) BSC 0.625 (15.87) 0.600 (15.24) 0.195 (4.95) 0.125 (3.18) 0.015 (0.381) 0.008 (0.204) 0.070 (1.77) MAX 14 28-Lead Plastic Leaded Chip Carrier (PLCC) (P Suffix) 0.180 (4.57) 0.165 (4.19) 0.025 (0.63) 0.015 (0.38) 0.048 (1.21) 0.042 (1.07) 0.048 (1.21) 0.042 (1.07) 5 0.056 (1.42) 0.042 (1.07) 26 PIN 1 4 PIN 1 IDENTIFIER 25 0.021 (0.53) 0.013 (0.33) 0.430 (10.92) 0.390 (9.91) 0.032 (0.81) 0.026 (0.66) 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) MIN 0.050 (1.27) BSC TOP VIEW 11 SEATING PLANE 0.020 (0.50) R 12 0.456 (11.58) 0.450 (11.43)SQ 0.495 (12.57) 0.485 (12.32) SQ 18 19 0.040 (1.01) 0.025 (0.64) 0.110 (2.79) 0.085 (2.16) -6- REV. 0 PRINTED IN U.S.A. C1853-7.5-10/93 |
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