19-2002; Rev 0; 1989 SUL AM AIL/VI +5V Powered Isolated RS-232 Drivers/Receivers General Description The MAX250 and MAX251 chip set form the heart of a complete, electrically isolated, RS-232 dual transmit- ter/receiver. By combining many functions on two chips, the cost and complexity required for an isolated digital interface is greatly reduced. Four low cost optocouplers, four capacitors, a diode and a small pot-core type trans- former are all that are required to complete a 19.2k baud transceiver. Faster data rates are possible by using high speed optocouplers. In addition to the driving and receiv- ing circuitry for the optocouplers, the chip set includes a push-pull transformer driver to supply power to the interfaces isolated side. Other convenient features include single +5V operation, a low power shutdown mode, and output enable control for three-state operation. The MAX250 and MAX251 are supplied in 14 lead DIP, 14 lead small outline and 20 leadless chip carrier packages. The MAX252 has all the required components for RS-232 communication in a single package. Applications High Noise Data Communications Industrial Communications Data Links To Analog Circuits Bridge Ground Differentials Features @ Isolated Data Interface @ Single +5V Supply @ Uses Low Cost Optocouplers @ 5u.W Low Power Shutdown @ 2 Transmitters and 2 Receivers Ordering Information PART TEMP. RANGE PACKAGE* MAX250CPD___O'C to +70C 14 Lead Plastic DIP MAX250CSD_ OC to +70C 14 Lead SO MAX250C/D 90C to +70C Dice MAX250EPD 40C to +85C =: 14 Lead Plastic DIP | MAX250ESD _-40C 10 +85'C 1d Lead SO MAX250EJD 40C to +85C 14 Lead CERDIP MAX250MJD__-55C to +1250 14 Lead CERDIP MAX250MLP_-55C to +125 = 20 Lead LCC MAX251CPD OC to +70C 14 Lead Plastic DIP MAX251CSD_s OC to+70'C~ 14 Lead SO MAX251C/D OC to +70C Dice |_ MAX251EPD_-40C 10 +85C 14 Lead Piastic DIP _| MAX251ESD __-40C to +85C 14 Lead SO MAX251EJD 40C to +85C_ 14 Lead CERDIP | MAX251MJO_-55C to +195C 14 Lead CERDIP MAX251MLP 55C to +125C = 20 Lead LCC * Maxim reserves the right to ship Ceramic packages in lieu of CERDIP. packages Pin Configurations 3S Oo . oOo on Top View S542 = = Titpr 4 - 18 Rou Tiny 5 17 Rep MAAXLIA NC. 6 MAX250 16 NC T2IN 7 5 SHDN Vec 15 Ripww T2LOR 8 _ 14 Riguy of 13) D2 MAAXAAA Oorn 2 TiLor MAX250 Reout Sa sea = 3 Zz a = Thy Repin 7 * 59 . 9 COBs T2in 10] Riow 2 5 Z=e @ T2.pr | 9 | Rtour 6 _ Tpin 4 18 Tout GND [7 | 8 | EN T2pIn 5 17 T2pIn MAXLAA NC. 6 MAX251 16 NC Rion 7 15 Rtiy R2ior 8 14 R2in eoerNye 2ESES MAXI WMAKIvI is a registered trademark of Maxim Integrated Products. Maxim Integrated Products LSZXVW/OSCXVWMAX250/MAX251 +5V Powered Isolated RS-232 Drivers/Receivers ABSOLUTE MAXIMUM RATINGS: MAX250 Power Dissipation Voltage. Veo. 0c ov b eee ee 6V Plastic DIP (derate 7mW/'C above 70C)... . 375mWw puppy i. tage, Vee OV to Wee 20. 8V CERDIP (derate 9. 5miW/'C above 70C) _ 675m nput Voltages Ce -0.3V to (Voc +0.3V) Small Outline (derate 7MW/'C above 70C)... . 375mW Output Drive Current, Ot, D2 eee . 240mA LCC (derate 7mMW/C above 70C) 375mW Output Drive Voltage,D1,D2 ..........0..0..... Veo + 6V Lead Temperature (Soldering, 10 seconds) . +300C Opto Driver pins T1Upr, T2Lor, Rtout and R2out may be Storage Temperature ...... an 65 C to +160C shorted one at a time indefinitely to Vec or GND Stresses above 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 above those indicated in the operational section of the specitication is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ELECTRICAL CHARACTERISTICS: MAX250 (Vcc = 5V +10%, Ta = Full Temperature Range unless otherwise noted.) PARAMETER SYMBOL] CONDITIONS min [| TYP | MAX | UNITS | Supp Supply Voltage Range Veco Over Temp 4.5 | 5.5 Vv | Operating Supply Current lee D1, D2 Open 4 0.1 | 0.5 mA Shutdown | Shutdown Ta = -40C to +85C 1 10 A Supply Current cs Ta = 65C to +125C | | 100 u | Input Currents leN, IsHoN | Input = GND to Vec | 0.001 | 1 uA | POWER DRIVER D1, D2 ethhtiehen eines ae a | I 200 | 275 | kHz ON Resistance 25 ol 50 Q Power Driver | _ | | Leakage Current 1 10 BA Zener Clamp Voltage 6 | 8 | 10 | Vv DRIVER SECTION Pull-up Current | | Voc = 5V, Vin = OV, | Input source lp Ta = 25C | @ | s 6 | HA Current _ O65" 7) . - - Output Source | Is Vout = 1.4V, Ta = 26C 5 | 8 15 mA TTLICMOS Output | _ 4 | Voltage Low Vou + = 3.2mA L 4 0.4 | v J. a 8 TTLICMOS Output a |_ Voltage High Vou att =-1.0mA L 24 _| ! Vv input Logic _ Threshold High L* Ti, Roy, EN, Shutdown | | 18 24 | v Input Logic _ Threshold Low | Vit Tix. Ruin, EN, Shutdown | 0.8 T 1.3 | Vv | input Hysteresis ViHys ee Lo _ (05 | v Leakage Current | en _\v. T input and Output I (EN or Shutdown) = Veo 4 4 10 | pA Input Capacitance Cin | 5 | pF 2 MAXIM+5V Powered Isolated RS-232 Drivers/Receivers ABSOLUTE MAXIMUM RATINGS: MAX251 Positive Input Voltage, AC terminal ......... a .. 15V Diode Forward Current (AC toV*) .. . 250mA Positive Input Voltage, V terminal ........ bees 14V Reverse Diode Voltage... 26.0... .-28V Negative Input Voltage, V terminal ............0..... -14V Power Dissipation RS-232 Input Voltage ............. oe, -30V to 30V Plastic DIP (derate 7mW/'C above 70C) _... 375mW he oe ee sou. Von Sy . vey CERDIP (derate 9.5mW/"C above 70C) .__ 675mW - pplled Culput Vollage 60... 6... vtavto Small Outline (derate 7MW/C above 70C) _ 375mWw Tristate Input Voltage, VatRi............. -0.3V to (V" + 0.3V) LCC (derate 7mW/"C above 70C) ....... _. 375mW RS-232 Transmitters may be indefinitely shorted to GND Lead Temperature (Soldering, 10 seconds) ......... +300C Opto Driver pins R1Lpr, R2Lpr may be shorted one at a time Storage Temperature beeen -65C to +160C indefinitely to GND Stresses above 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 above those indicated in the operational section of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ELECTRICAL CHARACTERISTICS: MAX251 (Test Circuit 1, See Figure 3, Ta = Full Temperature Range unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Positive Supply Current lt RL= 0 0.7 25 mA Negative Supply Current i RL= 00 | oO 45 10 mA | RS-232 CHARACTERISTICS Voltage Sung Tvs | foaded with Ska to Ground | 72 v typ Leakage Current Tou Tour = #18V 10 10 | uA RS-232 Input Threshold High Vin 18 : 3.0 RS-232 Input Threshold Low Vit 0.6 1.2 RS-232 Input Hysteresis Vinys 0.6 RS-232 Input Resistance Ta = 25C 3 7 7 kQ 3-State Enable ten 35 i HS 3-State Disable tos 1.0 us Transmitter Slew Rate : R= 3kQ, CL = 2500pF 3 Vis OPTOINTERFACE CHARACTERISTICS Input Pull-up Current lp Ta = 25C 2.5 4 ] 6 HA ) input Pull-up Voltage Clamp Veci w.r.t. ISO GND 3 V | input Threshold Voltage High Vin : _ 15 | 2 V Input Threshold Voltage Low Vit 0.8 1.2 - V Input Hysteresis Voltage Vinys 03 v MAXKISVI 3 LSCXVIW/OSCXVWMAX250/MAX251 +5V Powered Isolated RS-232 Drivers/Receivers ELECTRICAL CHARACTERISTICS: MAX251 (continued) (Test Circuit 1, See Figure 3, Ta = Full Ternperature Range unless otherwise noted.) PARAMETER SYMBOL | CONDITIONS MIN TYP | MAX | UNITS | Output Source Current IPH Vout = 1.4V, Ta = 25C -12 7 5 mA Output Voltage Low VoL lout = 3.2mA - 0 4 V QuiputLeakage I (RTRI or Shutdown) = +5V | 10 | yA 3-STATE CONTROL - | Pulldown Current leo Vv =GND 10 | 4 Ty. Threshold Voltage V1 06 | 14 [7 (2 | v | MAX251 V* SUPPLY VOLTAGE vs. LOAD CURRENT Tq = 25C. INCLUDING TWO - 5kQ. TRANSMITTER LOADS Viv) CIRCUIT OF FIG. 3, 5 SCHOTT TRANSFORMER 4 #67114760 : 0 10 20 30 40 50 V* OUTPUT CURRENT (mA)j a Vor .0 MAX251 TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE 14 r T T 2 5nf RS-232 SPEC. LIMIT | aes ij 4 |__| t> 5 | RL = 3k82. Veo = 5.0V ~ SCHOTT TRANSFORMER #67114760 TRANSMITTER SLEW RATE (V/si 1 oO 2000 4000 6000 8000 10000 LOAD CAPACITANCE (pF} iV] MAX251 V SUPPLY VOLTAGE vs. LOAD CURRENT Ta = 25C, INCLUDING TWO 5k(Q2 TRANSMITTER LOADS Veo 4 4V 1 6 + Ver UV s | CIRCUIT OF FIG. 3, SCHOTT TRANSFORMER #67114760 0 10 20 30 -40 50 V OUTPUT CURRENT imAi MAX250 PROPAGATION DELAY vs. TEMPERATURE 0 25 50 75 100 125 TEMPERATURE ( C} 60 -25 BYPASS WV: PROPAGATION DELAY tus: Typical Operating Characteristics MAX251 V BYPASS vs. LOAD 6 r Vec = 5.0V LEDs OFF 5 & | LEDs ON | 3 ' t ? | | : 1 | : | 0 | | 0 5 10 15 20 LOAD [mAl MAX251 PROPAGATION DELAY vs. TEMPERATURE 25 T TRANSMITTERS ' , 1 15 A | | + Veo = 4.5 1 = : . ~ 95 RECEIVERS pit | | 0 50 25 Qo 25 50 75 100 125 TEMPERATURE { Ci MAAXAKI/WI+5V Powered Isolated RS-232 Drivers/Receivers Typical Operating Characteristics (continued) MAX251 TRANSMITTER MAX250 D1, D2 MAX250 ENABLE, SLEW RATE SWITCH FREQUENCY DISABLE TIME vs. TEMPERATURE vs. TEMPERATURE vs. TEMPERATURE 18 RU = 3kQ2 16 = 2500 pF 14 Vec=5.5V ~ a 12 \ & = tr S #10 z z ik S 4 Vee = 4.5V 3 2 __. 0 0 | : -55 -25 0 25 50 75 100 125 55-25 O 25 50 75 100 125 55 -25 0 25 50 75 100 125 TEMPERATURE ( C) TEMPERATURE ( C) TEMPERATURE (C) POWER UP DELAY FROM RTRI DELAY TIME MAX250 Vec TO MAX251 TIME FROM SHUTDOWN TO RECEIVER TRANSMITTER OUTPUTS TO POWER UP OUTPUT ACTIVE : vO Vec = 5V Voc = 5V 5 - | | 5 | | pe 5 | | | | . : ov SHUTDOWN | | | 5V | | To.) Oo) Eee aa | a f 2 8 oo > | [ ! I 2. flli yy &, FT 6 rey tid * I | OFF 5V HY. jl, | Lan SAPS tut | iN 9 RECEIVER OUTPUT _ VON BYP CAP = 4.7uF | | ; | | FTOUTLOAD = 5kQ2 | poe ' | | | | Lit _ |. i ims/DIV 500 us/DIV tys/DIV MIAXISVI 5 LSCXVW/OSZXVINNMAX250/MAX251 +5V Powered Isolated RS-232 Drivers/Receivers Pin Description MAX250 | MAX250 | MAX251 | MAX251 | | Lcc DIP & SO | SYMBOL DESCRIPTION Loc [Pre & SO SYMBOL| DESCRIPTION PIN# PIN# | PIN | PIN# _| 1 - N.C | 1 | - | N.C. 2 1 SHDN Shutdown: When+5V, turns 2 | { AC Anode of Inout Power Supply off the oscillator, disconnects | Diode driver input pull-up resistors T + , and opens 01, D2. For normal 3 | 2 Vv Positive Supply Output | operation, ground shutdown. L | _ Terminal 3 2 D1 Open Drain of Transformer 4 | 3 T1pin | Transmitter #1 Detector Driver MOSFET | [Input 4 3 Toor Transmitter #1 LED Driver 5 | 4 " jinput #2 Detector u 5 4 TIN [input Transmitter #1 6 | INC | Input - | T TO | : - 7 5 R1Lor Receiver #1 LED Driver 6 NC. | pout 7 | 5 T2in [TTLicMos Transmitter #2 8 | 6 [Reon Receiver #2 LED Driver | Input 9 | - INC 8 6 IT2.08 Transmitter #2 LED Driver 10 | 7 __ BYP | Internal Ve: Bypass Point 8 IN.c. 11 - NC. 10 ? | GND Ground 12 | 8 RTRI Receiver Output 3-State 11 - IN Cc When +5V, Receiver Outputs in - | | [90 Hi impedance 12 8 EN Output Enable: When +5V, | | Ping Tipe, T2.pr, 13 I - INC. | Rilout and R2our go Hi . | | [impedance 14 L 9 | R2in RS-232 Receiver #2 Input } 15 10 R1in RS-232 Receiver #1 Input 13 | - INC. | { | Ne | 14 | 9 Rout TTLICMOS Receiver #1 | | | [Output 17 11 T2001 RS-232 Transmitter #2 15 10 R1 pn Receiver #1 Detector Input | ee 18 12 Tiout RS-232 Transmitter #1 16 NC. [L | [Output 17 | in R2on [Receiver #2 Detector Input 19 ye 13 V Negative Supply Output 18 | 12 [Roe ITTLCMOS Receiver #2 | | {Voltage | |Qutput 20 14 | ISO GND | Isolated Ground 19 | 13 D2 Open Drain of Transformer [Driver MOSFET 20 14 Vee 45 Positive Supply Voltage a MAKI+5V Powered Isolated RS-232 Drivers/Receivers ot} 2 RC OSC ov AAAXLAA (300kH2) BY2 MAX250 13.5V 1 | SHDN AL Voc 4 7 Sot a rev | Cpe [13 Voc LW 13.5 | GND | 7 4yA = 4 Zz w p [>< Mor | 3 Voc uA 12 51 12 > LOR | 6 a] EN Voc aA S| Pour oo A 3 Ripin | 10 Vec AuA 12] Rout Rapin J 11 ANAXLAA MAX251 Hh a 4 Nn g iz I; > O Zour Figure 1. MAX250 Block Diagram Typical Applications Figure 3 shows the typical connection for a complete 19.2k baud isolated RS-232 circuit. Figure 3 also shows how 4N26 optocouplers can be replaced by 6N136 devices to achieve 90k baud rates. A recommended printed circuit board layout is shown in Figure 4. This may be modified for individual designs but two important factors should be considered. 1.) To max- imize isolation, the isolation line" through the center of Figure 4 should not be breached. Connections and com- ponents from one side should not be located near those of the other side. 2.) Since the optocoupler outputs are relatively high impedance nodes, they should be located as close as possible to the MAX250 and MAX251. This minimizes stray capacitance and maximizes data rate. When the MAX250's shutdown input (SHDN) is taken high, power is removed from the MAX251, and the RS-232 transmitter outputs (T1out, T2ouT) go to high impedance states. Timing plots in the Typical Operating Charac- teristics section show the turn-on and enable delays for various control functions. The circuit in Figure 4 has been laid out so that it can be used for either a one or two sided PC board. The lines that are thick from one IC pad to the next IC pad are on the bottom side. Lines that are broken by a thin line can MAAXKI/VI Figure 2. MAX251 Block Diagram either go on the top side of the board or on the bottom side with jumpers where the thin lines appear. At no time should any lines cross the middle of the board at the isolation barrier. The MAX250 and MAX251 have a logic inversion in the optocoupler when using the standard configuration. For applications where no inversion is required, or more LED drive current is needed, Figure 5 shows the output struc- ture of the LDR output. The LDR output can typically source 7MmA and sink 25mA. Because of the higher sink- ing capability, a current limiting resistor is required. Detailed Description The MAX250 and MAX251, together with four op- tocouplers and a transformer, form an isolated dual RS-232 transmitter and receiver (See Figure 3). The MAX250 connects to the non-isolated or "logic" side of the interface, translating logic signals to and from the op- tocouplers, while the MAX251 resides on the isolated or "cable" side, translating data between the optocouplers and RS-232 line drivers and receivers. |n addition to the optocoupler drivers and receivers, the MAX250 also con- tains isolation transformer drive circuitry which supplies power to the isolated side of the interface, and the MAX251, LSCXVIW/OSCXVWMAX250/MAX251 +5V Powered Isolated RS-232 Drivers/Receivers ANAXLAA MAX250 D1 Veo 02 4 TN THLoRP 3 TILicMos { [> 5 INPUTS T2 T2 IN D LOR R 9) TOUT <i RipiN TEMS { OUTPUT! 12) R2ouT 60 R2pIN. 8] EN CONTROL 1] SHUTDOWN 7] GND P 4X 4N26 1:1 TRANSFORMER IN4148 SEE TABLES 2 AND 3 1 fy; ed ~ 1 AC vv MANAKIN MAX251 Vv Town p> Tout 2 Vices 2 on | itor <i Rin} 10 . : ee -10V0u1 oe Fp 4 [BE st0Vour OUTPUTS wl | BYP yo 6N136 HIGHER SPEED ALTERNATE OPTOCOUPLER 8 oret ie: GND 4 5 t * GND j-o> OR 6 ag VOC DIN RS-232 R2LpR A pain| 9 ff INPUTS avrl| 8 sOGNO] 14 Ne Figure 3. Isolated RS-232 Interface ov MAAXLAN MAX250 SHDN Tin T2iNn RIOUT Regut Tout T20uT Rtn R2in RTRI iSO GND ISOLATION BARRIER Figure 4. Recommended PC Board Layout for Dual Channel, Optoisolatea, Self-Powered RS-232 8 MAXAI/vI+5V Powered Isolated RS-232 Drivers/Receivers +5V Lf o+4 LOR INVERTING +5V +5V ju NONINVERTING Figure 5, LDR Output Structure MAX250 The MAX250 contains four identical noninverting drivers whose outputs may be used either as optocoupler LED drivers or as TTL/CMOS logic outputs. Each driver input (Tn, T2in, R1 cn, R2pin) has a "weak" 4yA internal pull-up current source, and 0.5V of hysteresis to improve noise rejection. The input logic thresholds conform to standard TIL/CMOS specifications. In normal operation, the MAX250 driver outputs (T1Lor, T2Lpr, Riout, R2out) source 7mA via internal current sources and do not require limiting resistors when driving grounded optocoupler LEDs or CMOS/TTL logic inputs. The outputs can also sink up to 25mA when the current is limited by external resistors. D1 and D2 are open-drain N-Channel MOSFETs which drive an external isolation transformer in push-pull fashion at 150kHz with a 50% duty cycle. A 1:1 transformer turns ratio provides a 10V peak-to-peak output at the secon- dary. Specifications and suitable manufacturer's part numbers for this transformer are listed in Tables 2 and 3. No transformer snubbers are required because D1 and D2 are protected against switching transients by internal 13.5V zener clamp diodes as shown in Figure 1. The MAX250 functions also include an output enable control (EN) and a SHUTDOWN pin (SHDN). EN puts all driver outputs into a high impedance state when driven high. SHDN, when pulled high, disables the following MAX250 functions: 1.) Disables D1 and D2; 2.) Turns off the oscillator, 3.) Shuts off 4A pull-up currents at driver inputs, 4.) Resets driver outputs to a low state; 5.) Lowers power consumption to 5uW. MAAKIM MAX251 The MAX251 connects to the "cable" side of the RS-232 interface and includes two line drivers and receivers along with circuitry to translate these levels to op- tocoupler signals. The RS-232 inputs (R1in, R2in) and outputs (Tlour, T2ouT) completely conform to all EIA RS-232C and CCITT V.28 specifications. The receiver outputs (R1Lpr, R2LpR) source 7mA and can drive optocoupler inputs without external current limiting resistors. The MAX251 transmitter inputs (7T1piNn, T2pin) contain 4uA internal pull-ups which allow direct connection to optocoupler output transistors, again without external resistors. When the MAX251's RTRI input is pulled high, the receiver outputs (R1Lor, R2Lpr) are disabled and go toa high impedance state. In normal operation, this pin is left open or grounded. Optocoupler Limitations In Figure 3, the 4N26 optocouplers are connected in "diode mode" to optimize cost and data rate. While Current Transfer Ratio (CTR) is generally unspecified for this configuration, optocouplers from several manufac- turers have been successfully tested in this circuit. The MAX250/MAX251 require a minimum optocoupler cur- rent transfer ratio of 0.12%, but may exhibit data rate limitations from the combined effect of higher MAX250/MAX251 drive and high optocoupler CTR. The 6N136 optocouplers, shown in the inset in Figure 3 and listed in Table 1, operate in phototransistor mode, with limiting values of CTR specified by the manufac- turers. \f further information is required, please contact Maxim Applications. KSSXVW/OSCXVWNMAX250/MAX251 +5V Powered Isolated RS-232 Drivers/Receivers Component Selection Optoisolators Optoisolator manufacturers are listed in Table 1 for easy selection. The MAX250/251 combination can be used with a 4N26 to obtain a 19.2k baud rate when used in the Table 1. Manufacturers of Optoisolators diode-to-diode mode (base tied to the emitter). When the MAX250/251 is used with the 6N136, a 90k baud rate can be achieved when a 4kQ pull-up resistor to 5V is used on pin 6 of the 6N136. PART NO. MFGS SUGGESTED Vios TYP. PROP Ri (Vek ) toHL tpLH 4N25 MOT,PHL,QT,SM, TRW* NONE? 2500V 14us 6.3us 4N26 MOT,PHL,QT,SM, TRW NONE? 1500V 14us 4.3us 6N136 HP,QT,TRW 4K 2500V 1.8ys 1.5us * MOT= Motorola Inc. (303) 337-3434 PHL = Phillips (401) 232-0500 QT = Quality Technologies (General Instrument) (415) 493-0400 SM = Siemens Components (408) 257-7910 TRW= TRW Electronic Components Group (214) 323-2200 Note 1: This list does not constitute an endorsement by Maxim Integrated Products and is not intended to be a comprehensive list of all manufacturers of these components. Note 2: When used with a MAX250/251. Transformers Table 2 is a list of transformer characteristics that should be used to customize your own transformer. Table 3 is a list of transformers that are compatible with the Table 2. Transformer Characteristics MAX250/251 chip set. The list includes both transformers that are small and more expensive and transformers that are larger and less expensive. Pri. Inductance 1mH to 2.5mH Pri. Leakage Inductance 30uH Turns Ratio 1:1 Pri. center tapped ET 50V-us Switching Frequency 150kHz Interwinding Capacitance < 100pF DC Resistance < 2Q Ipk 300mA Dielectric Strength > 1500 VAC/1sec. 10 MAAIL/VI+5V Powered Isolated RS-232 Drivers/Receivers Table 3. Transformers Selection for Common Designs MANUFACTURERS LESS EXPENSIVE SMALL BH ELECTRONICS 604 Michigan Rd. Q6471-1 Q6471-2 Marshall, MN 56258 (507) 532-3211 MINI-MAGNETICS 1100 Fulton Place Fremont, CA 94539-7077 MM2757 MM2758 (415) 490-7500 SCHOTT Corporation 1000 Parkers Lake Rd. 1 Minneapolis, MN 55391 67114760 67117970 (612) 475-1173 Note 1: This list does not constitute an endorsement by Maxim integrated Products and is not intended to be a comprehensive list of all manufacturers of these components. Chip Topographies MAX250 MAX251 fy ; i i) i a | 0.079" (2.001mm) HI aL = 0.067" (1.702mm) 0.070" (1.778mm) MAAXLAN . bo 1 LSCXVW/OSCXVINMAX250/MAX251 +5V Powered Isolated RS-232 Drivers/Receivers Package Information 0785 [7899 MAX. "Le nD Ml 025 dx (01635) 8 0291 = =f | 0.100 (2540) MAX >| fe 0.125 aqyy 3.175) 0.290 - 0320 (7.336 - 8128) (0.060 + 0.005 ~| [AT ses azn tt an 0020 - 0070 (0.508 - 1.78) 1365 + 0028 0.100 = 0.010 (9.779 + 0.635) ei = 0264 hy + 0.002 (0.457 + 0051) 14 Lead CERDIP (JD) Oya = 105C/W Oyc = 50C/W HA AAA <> F 0.150 0.158 0.181 - 0.205 0.228 - 0.244 sero 13) (4.597 - 5.207) (5.791 - 6.198) HEHE ae t LEAD #1 Bst logan 0.014 - 0018 kt i) (0.356 0.457) a9 ae 0.336 - 0.344 >| 1 (0.381) I igs34- 8737) 5 fOR "4 4 >| le 0.018 - 0.022 (1083 0.069 40.457 - 0.559) (1.348 1.753) 0.004 - 0.008 (0.102 - 0.203) 0.007 - 0,009 (0.178 - 0.229) 14 Lead Small Outline (SD) Oya = 115C/W 8yc = 60C/W 1,270 + 0127 Tr _ nh 0.025 + 0,003 | 0.635 + 0.076 0.008 - 0.012 (0.202 - 0.305) ae 0.770 MAX. (19.568) LEAD #1 ta oy . (6.350 + 0127) 0073 + 1015 (1.854 0.381) ute .040 ( (2820 - 128) (1.076) TYP. 0.130 + 0.005 (3302+ 1127 FP Jy 4 o-10 __- 2009-015 + (0.228 - 0.381) 0.020 t (0.508) a a 3 MIN - 0018 + 0.003 ml 5 2025 oars (0457+ 0076) = 0015 0.100 + 6.010, * 0.635 (2540 + 0.254) 58 381 14 Lead Plastic DIP (PD) Oya = 140C/W Oyo = 70C/W LEAD #1 CHAMFER 0.350 + 0.008 0.020 ji os. MIN 6.890 + 0.203 osog REF 2.072 9 200 0.335 + 0,002 5.080 BCS 8509 + 0.051 , 0.229 + 0.152 0.040 CREF 1.016 (3 PLCS) 0.085 + 0.008 2.159 + 0.203, 0.015 + 0.007 0.381 + 0.178 CARTED) 9.060 + 0.005 0.072 t 0.008 1.542 + 0127 1.829 t 0.203 20 Leadless Chip Carrier (LP) Ou, = 140C/W Bic = 45C/W 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 12 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408)737-7600 1989 Maxim Integrated Products Printed U.S.A 19-1275 6/89