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 1 14 VCC 1Z 2 13 2Z 1Y 3 12 2Y 1A 4 11 2B 1B 5 10 2A Function Table Input Output A B C D Y Z 1C 6 9 2C H H H H H L GND 7 8 D H L H H L H L H H H L H L L H H L H X X L X Z Z X X X L Z Z H L X Z : : : : High level Low level Irrelevant High impedance (Top View) HD29412 HD29412 Absolute Maximum Ratings Item Symbol Ratings Unit Supply Voltage VCC *1 7 V Input Voltage VIN PT 5.5 V Power Dissipation 1150 mW Operating Temperature Topr Storage Temperature Tstg °C 0 to + 70 –65 to + 150 °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 Symbol Min Typ Max Unit Supply Voltage VCC 4.75 5.00 5.25 V Output Current IOH –40 mA IOL 40 mA 70 °C Item Operating Temperature Topr 0 Electrical Characteristics (Ta = 0 to +70°C) Item Symbol Conditions Min Input Voltage VIH 2 Typ *1 Max Unit V 0.8 VIL Input Clamp Voltage VIK VCC = 4.75 V, II = –12 mA Output Voltage VOH VCC = 4.75 V, VIL = 0.8 V –1.5 2.5 V V VIH = 2 V, IOH = –40 mA VOL VCC = 4.75 V, VIL = 0.8 V 0.5 VIH = 2 V,IOL = 40 mA Output Clamp Voltage 2 VOK VCC = 5.25 V, IO = –40 mA –1.5 V HD29412 HD29412 Item Differential Output Voltage VOD1 VOD2 Change In Magunitude Of Differential Output Voltage *1 Common Mode Output *3 Voltage VOD VOC Magunitude of Common Mode Output Voltage *2 Output Current With Power Off Off State (High Impedance) Output Current Input Current (A, B, C Input) Input Current (D Input) Short Circuit Min Typ*1 Max Symbol Conditions Output *4 Supply Current (All Input GND) VOC IO IOZ VCC = 5.25 V, IO = 0 mA 2 VOD2 V RL = 100 Ω VCC = 4.75 V Unit 2 VCC = 4.75 V 0.4 V VCC = 5.25 V 3 V VCC = 4.75 V 3 VCC = 4.75 V or 5.25 V 0.4 V VCC = 0 VO = 6 V 100 µA VO = –0.25 V –100 VO = –0.25 V to 6 V ±100 Ta = 25°C, VO = 0 to VCC Ta = 70°C VO = 0 V ±10 VCC = 5.25 V Output Control = 0.8 V µA –20 VO = 0.4 V ±20 VO = 2.4 V ±20 VO = VCC 20 II VCC = 5.25 V, VI = 5.5 V 1 mA IIH VCC = 5.25 V, VI = 2.4 V 40 µA IIL VCC = 5.25 V, VI = 0.4 V –1.6 mA II VCC = 5.25 V, VI = 5.5 V 2 mA IIH VCC = 5.25 V, VI = 2.4 V 80 µA IIL VCC = 5.25 V, VI = 0.4 V –1.8 mA IOS VCC = 5.25 V –150 mA ICC VCC = 5.25 V, Ta = 25°C 65 mA –40 31 Notes: 1. All typical values are at VCC = 5.0 V, Ta = 25°C 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 Ω VOD2 50 Ω VOC Switching Characteristics (VCC = 5 V, Ta = 25°C) Item Symbol Test Circuit Conditions Propagation Delay Time tPLH 1 Connection A CL = 30 pF, RL = 100 Ω tPHL tPLH 1 Connection B CL = 15 pF tPHL Transition Time tTLH 1 Connection A CL = 30 pF, R L = 100 Ω tTHL Output Enable Time Output Disable Time Over Shoot Coefficient 4 Min Typ Max Unit 16 25 ns 11 20 13 20 9 15 4 20 4 20 tZH 2 CL = 30 pF, RL = 180 Ω 7 20 tZL 3 CL = 30 pF, RL = 250 Ω 14 40 tHZ 2 CL = 30 pF, RL = 180 Ω 10 30 tLZ 3 CL = 30 pF, RL = 250 Ω 17 35 2, Connection C RL = 100 Ω 10 ns ns ns % HD29412 HD29412 Switching Time Test Circuit 1. 1 KΩ 5V Input Y Pulse Generator 25 ns Output Z 50 Ω 5 ns 5 ns 3V 90 % 90 % 1.5 V 1.5 V Input 10 % 10 % tPLH 1.5 V 10 % Y Y Z VOH 90 % 90 % Connection A CL = 30 pF RL = 100 Ω 1.5 V 10 % tTLH VOH 90 % 90 % 1.5 V 1.5 V 10 % 10 % tTHL Connection B VOL tTHL tPLH tPHL Z 0V tPHL VOL tTLH Y Z CL = 15 pF CL = 15 pF Over Shoot ≈ 100 % 0% Connection C Over Shoot Y RL = 100 Ω Z 5 HD29412 HD29412 2. tZH, tHZ Input 5ns Pulse Generator Input 50 Ω CL = 30 pF 10ns 3V 90 % 90 % 1.5 V 1.5 V 10 % 10 % 100ns tZH Output 0.5 V Output VOH 1.5 V RL = 180 Ω CL = 30 pF 0V Voff ≈0V tHZ 1K 5V 3. tZL, tLZ 5ns Input Input Pulse Generator CL = 30 pF 5V 5V RL = 250 Ω 1 KΩ 3V 90 % 90 % 1.5 V 1.5 V 10 % Output Output 10ns 100ns 10 % 0V tZL tLZ 5V 1.5 V CL = 30 pF 0.5 V VOL Notes: 1. The pulse generator has the following characteristics : PRR = 500 KHZ, ZOUT = 50 Ω. 2. CL includes probe and jig capacitance. 6