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| HD26LS32 Quadruple Differential Line Receivers With 3 State Outputs ADE-205-577 (Z) 1st. Edition Dec. 2000 Description The HD26LS32 features quadruple line receivers designed to meet the specs of EIA standard RS-422A and RS-423. This device operates from a single 5 V power supply. The enable function is common to all four receivers and offers a choice of active high or active low input. Fail safe design ensures that if the inputs are open, the outputs will always be high. Logic Diagram 1A 1B 2A 2B 3A 3B 4A 4B Enable G Enable G 1Y 2Y 3Y 4Y HD26LS32 Pin Arrangement 1B 1 1A 2 1Y 3 Enable G 4 2Y 5 2A 6 2B 7 GND 8 16 VCC 15 4B 14 4A 13 4Y 12 Enable G 11 3Y 10 3A 9 3B (Top view) Function Table Differential Input A-B VID VTH VTL < VID < VTH VID VTL X H L X ? Z : : : : : High level Low level Immaterial Irrelevant High impedance Enable G H X H X H X L G X L X L X L H Output Y H H ? ? L L Z 2 HD26LS32 Absolute Maximum Ratings Item Supply Voltage In Phase Input Voltage Differential Input Voltage Enable Input Voltage Output Sink Current Continuous Total Dissipation Operating Temperature Range Storage Temperature Range Symbol VCC* VIC VID* VIN Iout PT Topr Tstg 2 1 Ratings 7.0 25 25 7 50 1 0 to +70 -65 to 150 Unit V V V V mA W C C Notes: 1. All voltage values except for differential input voltage are with respect to network ground terminal. 2. Differential input voltage is measured at the noninverting input with respect to the corresponding inverting onput. 3. The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. Recommended Operating Conditions Item Supply Voltage In Phase Input Voltage Output Current Symbol VCC VIC I OH I OL Operating Temperature Topr Min 4.75 -- -- -- 0 Typ 5.00 -- -- -- -- Max 5.25 7.0 -440 8 70 Unit V V A mA C 3 HD26LS32 Electrical Characteristics (Ta = 0 to +70C) Item Differential Input High Threshold Voltage Differential Input Low Threshold Voltage Input Hysteresis*2 Enable Input Voltage Symbol VTH VTL Min -- -- -- VTH - VTL -- VIH VIL Enable Input Clamp Voltage Output Voltage VIK VOH VOL 2.0 -- -- 2.7 -- -- Off State (High Impedance) Output Current Line Input Current II I I (EN) I IH I IL Input Resistance Short Circuit Output Current Supply Current ri I OS* I CC 3 Typ*1 Max -- -- -- 30 -- -- -- -- -- -- -- -- -- -- -- -- -- 9.8 -- 52 0.2 -0.2 -0.2 -- -- 0.8 1.5 -- 0.4 0.45 20 -20 2.3 2.8 100 20 Unit Conditions V VIC = -7 to +7 V VOH = 2.7 V, IOH = -440 A VOL = 0.4 V, IOL = 4 mA VOL = 0.45 V, IOL = 8 mA mV V VCC = 4.75 V, IIN = -18 mA VCC = 4.75 V VIL (G) = 0.8 V A VID = 1 V, IOH = -440 A VID = -1 V, IOL = 4 mA VID = -1 V, IOL = 8 mA VCC = 5.25 V VO = 2.4 V VO = 0.4 V mA A VI = 15 V, Other Inputs -10 to +15 V VI = -15 V, Other Inputs -15 to +10 V VI = 5.5 V VI = 2.7 V VI = 0.4 V VIC = -15 to +15 V (Other Inputs AC GND) VCC = 5.25 V VCC = 5.25 V, VI = 0 V (All Outputs Disable) I OZ -- -- -- -- Enable Input Current -- -- -- 6 -15 -- -0.36 mA -- -85 70 k mA Notes: 1. All typical values are at V CC = 5 V, Ta = 25C,VIC = 0. 2. Hysteresis is the differential between the positive going input threshold voltage and the negative going input threshold voltage. 3. Not more than one output should be shorted at a time. Switching Characteristics (VCC = 5 V, Ta = 25C) TItem Propagation Delay Time Output Enable Time Output Disable Time Symbol t PLH , t PHL t ZH , t ZL t HZ t LZ Min -- -- -- -- typ 17 15 15 20 Max 25 22 22 30 CL = 5 pF Unit ns Conditions CL = 15 pF 4 HD26LS32 1. tPLH, tPHL Test circuit VCC Input Output 2 k Pulse Generator *1 CL *2 5 k *3 2V Waveforms 2.5 V Input A 0V 0V -2.5 V 2.5 V Input B 0V 0V -2.5 V t PLH t PHL VOH Output 1.3 V 1.3 V VOL 5 HD26LS32 2. tHZ, tZH Test circuit VCC Output 2 k S1 2.5 V CL Input *2 5 k *3 Pulse Generator *1 2V *4 Waveforms 3V Enable G 1.3 V 1.3 V 0V 3V 1.3 V Enable G S1 : Open t ZH Output S1 : Closed t HZ 0.5 V VOH 1.4 V 0V 1.3 V 0V 1.3 V 6 HD26LS32 3. tLZ, tZL Test circuit VCC Output 2 k -2.5 V CL Input 5 k Pulse Generator 2V S2 Waveforms 3V Enable 1.3 V 1.3 V 0V 3V 1.3 V Enable G S2 : Open t ZL Output S2 : Closed t LZ VOH 1.3 V 0.5 V Notes: 1. 2. 3. 4. The pulse generator has the following characteristics : PRR = 1 MHz, 50 % duty cycle, tr 15 ns, tf 6 ns, Zout = 50 . CL includes probe and jig capacitance. All diodes are 1S2074 (H) To test G input,ground G input and apply an inverted input waveform. 1.4 V VOL 1.3 V 0V 7 HD26LS32 HD26LS32 Line Receiver Applications The HD26LS32 is a line receiver that meets the EIA RS-422A and RS-423A conditions. It has a high inphase input voltage range, both positive and negative, enabling highly reliable transmission to be performed even in noisy environments. Its main features are listed below. * * * * * * Operates on a single 5 V power supply. Three-state output On-chip fail-safe circuit 7 V in-phase input voltage range 200 mV input sensitivity Minimum 6 k input resistance A block diagram is shown in figure 1. The enable function is common to all four drivers, and either activehigh or active-low input can be selected. When exchange is carried out using a party line system, it is better to keep the receiver input bias current constituting the driver load small, as this allows more receivers to be connected. Consequently, whereas an input resistance of 4 k or above is stipulated in RS-422A and RS-423A, the HD26LS32 has been designed to allow a greater margin, with a minimum resistance of 6 k . Figure 2 shows the input current characteristics of the HD26LS32. The shaded areas in the graph indicate the input current allowable range stipulated in RS-422A and RS423A. HD26LS32 output is LS-TTL compatible and has a three-state function, enabling the output to be placed in the high-impedance state, and so making the device suitable for bus line type applications. With an in-phase input voltage range of 7 V and a 200 mV input sensitivity, the HD26LS32 can withstand use in noisy environments. Also, since signals sent over a long-distance transmission line require a long transition time, it also takes a long time to cross the receiver's input threshold level. Therefore, the input is provided with hysteresis of around 30 mV to prevent receiver output misoperation due to noise. An example of input hysteresis is shown in figure 3. The fail-safe function consists of resistances R connecting input A to VCC and input B to GND, as shown in figure 4. 8 HD26LS32 This circuit provides for the receiver input section to be pulled up or down by a high resistance that prevents it from becoming a driver load so that the output goes high in the event of a transmission line breakage or connector detachment. When the input pin is placed in the open state by the pull-up/pull-down resistance, the differential input voltage VID is as follows: VID: (VIA - VIB) 0.2 V and the output is fixed high. However, if the receiver-side termination resistance remains connected despite a line breakage or connector detachment, the output will be undetermined (figure 5). 1A 1B 2A 2B 3A 3B 4A 4B Enable G Enable G 1Y 2Y 3Y 4Y Figure 1 HD26LS32 Block Diagram 5 4 Input Current Iin (mA) 3 2 1 0 -1 -2 -3 -4 -3.25 mA -10 V -3 V Ta = 25C +3.25 mA V CC = = 0V 5.2 5V VC C +3 V +10 V -5 -25 -20 -15 -10 -5 0 5 10 15 20 25 Input Voltage Vin (V) Figure 2 Input Voltage vs. Input Current Characteristics 9 HD26LS32 5 VCC = 5 V, Ta = 25C Input applied to pin A, with pin B as reference Output Voltage Vout (V) 4 3 VIC = -7 V 2 VIC = 0 V VIC = +7 V 1 0 -100 -80 -60 -40 -20 0 20 40 60 80 100 Differential Input Voltage VID (mV) Figure 3 Differential Input Voltage vs. Output Voltage Characteristics VCC R Y R A B Figure 4 Fail-Safe Function This is because, since the termination resistance is normally matched to the transmission line characteristic impedance, the value falls to several tens of hundreds of ohms, and the differential input pins are shorted by this termination resistance. That is, the differential input voltage VID comes within the range VID: -0.2 V < VIA - VIB < 0.2 V and the output becomes undetermined. To prevent this, resistance R1 is inserted in series with the transmission line as shown in figure 6, minimizing the effect of the termination resistance. Resistance R 2 is added to increase the current flowing between the termination resistance and R 1, enabling the value of R1 to be kept small. Inserting resistances R 1 and R2 in this way provides for the differential input voltage VID to become 200 mV or higher, but the following points must be noted. * Smallest possible R1 value If this value is large, the receiver input sensitivity will fall. * Largest possible R2 value If this value is small, the load on the driver will be large. Figure 7 shows experimental differential input voltages for variations in R1 and R2. 10 HD26LS32 RT Undetermined RT "H" Figure 5 Examples of Transmission Line Disconnection VCC R2 Receiver Driver RT R1 R1 R2 Figure 6 Method of Enhancing Fail-Safe Function 0.6 Differential Input Voltage VID (V) 0k k R 2 0.5 =3 10 50 0k k 300 R2 = VCC = 5 V Ta = 25C 100 VCC R1 R2 VID R1 R2 0.4 0.3 0.2 0.1 0 5 R1 (k) 10 15 Figure 7 R 1, R2 vs. Differential Input Voltage 11 HD26LS32 RS-442A Interface Standard Applications Figure 9 shows sample operation waveforms at various points with 1200 m and 12 m cable lengths. 1. Unidirectional Transmission (1 : 1 Configuration) Driver Data A input C B RT E D Receiver F Data output Figure 8 1 : 1 Unidirectional Transmission Line : 1200 m Frequency : 100 kHz A GND Duty : 50% RT : 100 D GND E B GND C GND F GND GND H : 5 s/div V : 2 V/div Line : 12 m Frequency : 10 MHz A GND Duty : 50% RT : 100 D GND E H : 50 ns/div V : 2 V/div B GND C GND GND F GND Figure 9 Sample Transmission Waveforms 12 HD26LS32 2. Unidirectional Transmission (1 : n Configuration) Driver Data input RT RT Data output Enable Data output Receiver Data output Data output Figure 10 1 : n Unidirectional Transmission With this connection method, n receivers are connected for one driver. In the RS-422A standard, ten receivers can be connected simultaneously for one driver. Conversely, it is also possible to connect one receiver for n drivers. 3. Bidirectional Transmission Driver Data I/O RT RT Receiver Data I/O Enable Enable Receiver Driver Figure 11 Bidirectional Transmission When bidirectional data exchange is performed using a combination of the HD26LS31 and HD26LS32, since either high or low output control is possible, using complementary enable inputs for the driver and receiver makes it easy to configure the kind of combination illustrated in figure 11 . Extending this combination makes it possible to exchange n-bit data simultaneously, and handle a party line system. 13 HD26LS32 Package Dimensions Unit: mm 19.20 20.00 Max 16 9 1 1.3 1.11 Max 8 7.40 Max 6.30 0.51 Min 2.54 Min 5.06 Max 7.62 2.54 0.25 0.48 0.10 0.25 - 0.05 0 - 15 Hitachi Code JEDEC EIAJ Mass (reference value) + 0.13 DP-16 Conforms Conforms 1.07 g Unit: mm 10.06 10.5 Max 16 9 1 *0.22 0.05 0.20 0.04 8 0.80 Max 5.5 0.20 7.80 + 0.30 - 2.20 Max 1.15 0 - 8 0.70 0.20 1.27 *0.42 0.08 0.40 0.06 0.12 M Hitachi Code JEDEC EIAJ Mass (reference value) FP-16DA -- Conforms 0.24 g *Dimension including the plating thickness Base material dimension 14 0.10 0.10 0.15 HD26LS32 Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi's or any third party's patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party's rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi's sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi's sales office for any questions regarding this document or Hitachi semiconductor products. Hitachi, Ltd. Semiconductor & Integrated Circuits. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109 URL NorthAmerica Europe Asia Japan : : : : http://semiconductor.hitachi.com/ http://www.hitachi-eu.com/hel/ecg http://sicapac.hitachi-asia.com http://www.hitachi.co.jp/Sicd/indx.htm Hitachi Asia Ltd. Hitachi Tower 16 Collyer Quay #20-00, Singapore 049318 Tel : <65>-538-6533/538-8577 Fax : <65>-538-6933/538-3877 URL : http://www.hitachi.com.sg Hitachi Asia Ltd. (Taipei Branch Office) 4/F, No. 167, Tun Hwa North Road, Hung-Kuo Building, Taipei (105), Taiwan Tel : <886>-(2)-2718-3666 Fax : <886>-(2)-2718-8180 Telex : 23222 HAS-TP URL : http://www.hitachi.com.tw Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower, World Finance Centre, Harbour City, Canton Road Tsim Sha Tsui, Kowloon, Hong Kong Tel : <852>-(2)-735-9218 Fax : <852>-(2)-730-0281 URL : http://www.hitachi.com.hk For further information write to: Hitachi Semiconductor (America) Inc. 179 East Tasman Drive, San Jose,CA 95134 Tel: <1> (408) 433-1990 Fax: <1>(408) 433-0223 Hitachi Europe GmbH Electronic Components Group Dornacher Strae 3 D-85622 Feldkirchen, Munich Germany Tel: <49> (89) 9 9180-0 Fax: <49> (89) 9 29 30 00 Hitachi Europe Ltd. Electronic Components Group. Whitebrook Park Lower Cookham Road Maidenhead Berkshire SL6 8YA, United Kingdom Tel: <44> (1628) 585000 Fax: <44> (1628) 585160 Copyright (c) Hitachi, Ltd., 2000. All rights reserved. Printed in Japan. Colophon 2.0 15 |
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