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| HD29412 Dual Differential Line Drivers With 3 State Outputs The HD29412 features dual differential line drivers with three state outputs designed to satisfy the requirements of EIA-422. Each driver has an output control is low, the associated outputs are in a high impedance state. This permits many deviced to be connected together on the same transmission line for party line applications. Pin Arrangement NC 1Z 1Y 1A 1 2 3 4 5 6 7 (Top View) 14 13 12 11 VCC 2Z 2Y 2B Function Table 1B Input A H H L L X X H L X Z : : : : B H L H L X X C H H H H L X D H H H H X L Output Y H L L L Z Z Z L H H H Z Z 1C GND 10 2A 9 8 2C D High level Low level Irrelevant High impedance HD29412 Absolute Maximum Ratings Item Supply Voltage Input Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC *1 VIN PT Topr Tstg Ratings 7 5.5 1150 0 to + 70 -65 to + 150 HD29412 Unit V V mW C C Notes: 1. The values is defined as of ground terminal. 2. 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 Output Current Symbol VCC IOH IOL Operating Temperature Topr 0 Min 4.75 Typ 5.00 Max 5.25 -40 40 70 Unit V mA mA C Electrical Characteristics (Ta = 0 to +70C) Item Input Voltage Symbol Conditions VIH VIL Input Clamp Voltage Output Voltage VIK VOH VCC = 4.75 V, II = -12 mA VCC = 4.75 V, VIL = 0.8 V VIH = 2 V, IOH = -40 mA VOL VCC = 4.75 V, VIL = 0.8 V VIH = 2 V,IOL = 40 mA Output Clamp Voltage VOK VCC = 5.25 V, IO = -40 mA -1.5 V 0.5 2.5 Min 2 0.8 -1.5 V V Typ *1 Max Unit V 2 HD29412 Item Symbol Conditions VCC = 5.25 V, IO = 0 mA VCC = 4.75 V VCC = 4.75 V RL = 100 2 VOD2 Change In Magunitude Of Differential Output Voltage *1 Common Mode Output *3 Voltage Magunitude of Common Mode Output Voltage *2 VOD Differential Output Voltage VOD1 HD29412 Min Typ*1 Max Unit 2 VOD2 V 0.4 V VOC VCC = 5.25 V VCC = 4.75 V 3 3 0.4 V VOC VCC = 4.75 V or 5.25 V V Output Current With Power Off IO VCC = 0 VO = 6 V VO = -0.25 V VO = -0.25 V to 6 V 100 -100 100 10 -20 20 20 20 1 40 -1.6 2 80 -1.8 -40 31 -150 65 A Off State (High Impedance) Output Current IOZ VCC = 5.25 V Output Control = 0.8 V Ta = 25C, VO = 0 to VCC Ta = 70C VO = 0 V VO = 0.4 V VO = 2.4 V VO = VCC A Input Current (A, B, C Input) II IIH IIL VCC = 5.25 V, VI = 5.5 V VCC = 5.25 V, VI = 2.4 V VCC = 5.25 V, VI = 0.4 V VCC = 5.25 V, VI = 5.5 V VCC = 5.25 V, VI = 2.4 V VCC = 5.25 V, VI = 0.4 V VCC = 5.25 V VCC = 5.25 V, Ta = 25C mA A mA mA A mA mA mA Input Current (D Input) II IIH IIL Short Circuit Output *4 Supply Current (All Input GND) IOS ICC Notes: 1. All typical values are at VCC = 5.0 V, Ta = 25C VOD and VOC denote the change of VOD and VOC in absolute values, 2. respectively. Voltage generated when input level is changed from high to low. 3. Voc is the average of two output voltages referenced to GND, and is indentical to output offset voltage (VOS) in EIA standard RS-422. 4. Not more than one output should be shorted at a time and duration of the short circuit should not exceed one second. 3 HD29412 HD29412 50 VOD2 50 VOC Switching Characteristics (VCC = 5 V, Ta = 25C) Item Propagation Delay Time Symbol tPLH tPHL tPLH tPHL Transition Time tTLH tTHL Output Enable Time Output Disable Time Over Shoot Coefficient tZH tZL tHZ tLZ 2 3 2 3 2, Connection C CL = 30 pF, RL = 180 CL = 30 pF, RL = 250 CL = 30 pF, RL = 180 CL = 30 pF, RL = 250 RL = 100 1 Connection A CL = 30 pF, RL = 100 1 Connection B CL = 15 pF Test Circuit 1 Connection A Conditions CL = 30 pF, RL = 100 Min Typ 16 11 13 9 4 4 7 14 10 17 Max 25 20 20 15 20 20 20 40 30 35 10 % ns ns ns Unit ns 4 HD29412 Switching Time Test Circuit 1. HD29412 5V 1 K Input Y Output 25 ns 5 ns Input 10 % tPLH 90 % 90 % 1.5 V 1.5 V 10 % tPHL 90 % 90 % Y Y Z CL = 30 pF 1.5 V 10 % tTLH 1.5 V 10 % tTHL tPLH VOH 90 % 1.5 V 1.5 V 10 % 10 % tTHL tTLH VOL VOH 5 ns 3V Pulse Generator 50 Z 0V Connection A VOL RL = 100 tPHL 90 % Z Connection B Y Z CL = 15 pF CL = 15 pF Over Shoot 100 % Connection C Y RL = 100 Z 0% Over Shoot 5 HD29412 2. tZH, tHZ HD29412 Input 5ns Pulse Generator 50 Input CL = 30 pF 10 % Output Output CL = 30 pF 1K 5V RL = 180 100ns tZH 0.5 V 1.5 V tHZ Voff 0V 10ns 3V 10 % 0V VOH 90 % 90 % 1.5 V 1.5 V 3. tZL, tLZ Input Input CL = 30 pF 5V 1 K CL = 30 pF 5V RL = 250 10 % tZL tLZ 1.5 V 0.5 V VOL 5V 5ns 10ns 3V 10 % Pulse Generator 90 % 90 % 1.5 V 1.5 V 100ns 0V Output Output Notes: 1. The pulse generator has the following characteristics : PRR = 500 KHZ, ZOUT = 50 . 2. CL includes probe and jig capacitance. 6 |
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