NTE7447

NTE7447 Integrated Circuit TTL − BCD−to−Seven−Segment Decoder/Driver with Open Collector Outputs Description: The NTE7447 is a BCD−to−Seven−Segment Decoder/Driver in a 16−Lead plastic DIP type package that features active−low outputs designed for driving common−anode VLEDs or incandescent indicators directly. This device has full ripple−blanking input/output controls and a lamp test input. Display patterns for BCD input count above 9 are unique symbols to authenticate input conditions. The NTE7447 incorporates automatic leading and/or trailing−edge zero−blanking control (RBI and RBO). Lamp test (LT) may be performed at any time when the BI/RBO node is set at a high level. This device also contains an overriding blanking input (BI) which can be used to control the lamp intensity by pulsing or to inhibit the outputs. Inputs and outputs are entirely compatible for use with TTL logic outputs. Features: D Open−Collector Outputs Drive Indicators Directly D Lamp Test Provision D Leading/Trailing Zero Suppression Absolute Maximum Ratings: (Note 1) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V Current Forced Into Any Output in the Off−State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65C to +150C Note 1. Unless otherwise specified, all voltages are referenced to GND. Recommended Operating Conditions: Parameter Symbol Min Typ Max Unit VCC 4.75 5.0 5.25 V Off−State Output Voltage (a through g) VO(off) − − 15 V On−State Output Current (a through g) IO(on) − − 40 mA High−Level Output Current (BI/RBO) IOH − − −200 A Low−Level Output Current (BI/RBO) IOL − − 8 mA Operating Temperature Range TA 0 − +70 C Supply Voltage Electrical Characteristics: (Note 2, Note 3) Parameter Symbol Test Conditions Min Typ Max Unit High−Level Input Voltage VIH 2 − − V Low−Level Input Voltage VIL − − 0.8 V Input Clamp Voltage VIK VCC = MIN, II = −12mA − − −1.5 V High Level Output Voltage BI/RBO VOH VCC = MIN, VIH = 2V, VIL = 0.8V, IOH = -200A 2.4 3.7 − V Low Level Output Voltage BI/RBO VOL VCC = MIN, VIH = 2V, VIL = 0.8V, IOL = 8mA − 0.27 0.4 V Off−State Output Current a through g IO(off) VCC = MAX, VIH = 2V, VIL = 0.8V, VO(off) = MAX − 250 A On−State Output Voltage a through g VO(on) VCC = MIN, VIH = 2V, VIL = 0.8V, IO(on) = 40mA − 0.3 0.4 V Input Current Any Input except BI/RBO II VCC = MAX, VI = 5.5V − − 1 mA High Level Input Current Any Input except BI/RBO IIH VCC = MAX, VI = 2.4V − − 40 A Low Level Input Current Any Input except BI/RBO IIL VCC = MAX, VI = 0.4V − − −1.6 mA − − −4.0 mA BI/RBO Short−Circuit Output Current BI/RBO IOS VCC = MAX − − −4.0 mA Supply Current ICC VCC = MAX, Note 4 − 64 103 mA Note 2. .For conditions shown as MIN or MAX, use the appropriate value specified under “Recommended Operation Conditions”. Note 3. All typical values are at VCC = 5V, TA = +25C. Note 4. ICC is measured with all outputs open and all inputs at 4.5V. Switching Characteristics: (VCC = 5V, TA = +25C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit − − 100 ns Turn−Off Time from A Input toff Turn−On Time from A Input ton − − 100 ns Turn−Off Time from RBI Input toff − − 100 ns Turn−On Time from RBI Input ton − − 100 ns RL = 120, CL = 15pF Function Table: Decimal or Function 0 LT RBI D C B A H H L L L 1 H X L L 2 H X L 3 H X 4 H 5 H 6 Inputs BI/RBO Outputs (NOTE) a b c d e f g L H ON ON ON ON ON ON OFF L H H OFF ON ON OFF OFF OFF OFF L H L H ON ON OFF ON ON OFF ON L L H H H ON ON ON ON OFF OFF ON X L H L L H OFF ON ON OFF OFF ON ON X L H L H H ON OFF ON ON OFF ON ON H X L H H L H OFF OFF ON ON ON ON ON 7 H X L H H H H ON ON ON OFF OFF OFF OFF 8 H X H L L L H ON ON ON ON ON ON ON 9 H X H L L H H ON ON ON OFF OFF ON ON 10 H X H L H L H OFF OFF OFF ON ON OFF ON 11 H X H L H H H OFF OFF ON ON OFF OFF ON 12 H X H H L L H OFF ON OFF OFF OFF ON ON 13 H X H H L H H ON OFF OFF ON OFF ON ON 14 H X H H H L H OFF OFF OFF ON ON ON ON 15 H X H H H H H OFF OFF OFF OFF OFF OFF OFF Notes 1 BI X X X X X X L OFF OFF OFF OFF OFF OFF OFF 2 RBI H L L L L L L OFF OFF OFF OFF OFF OFF OFF 3 LT L X X X X X H ON ON ON ON ON ON ON 4 H = HIGH Level L = LOW Level X = Irrelevant NOTE: BI/RBO is wire−AND logic serving as blanking input (BI) and/or ripple−blanking output (RBO). Note 1. The blanking input (BI) must be open or held at a high logic level when output functions 0 through 15 are desired. The ripple−blanking input (RBI) must be open or high if blanking of a decimal zero is not desired. Note 2. When a low logic level is applied directly to the blanking input (BI), all segment outputs are off regardless of the level of any other input. Note 3. When ripple−blanking input (RBI) and inputs A, B, C, and D are at a low level with the lamp test input high, all segment outputs go off and the ripple−blanking output (RBO) goes to a low level (response condition). Note 4. When the blanking input/ripple blanking output (BI/RBO) is open or held high and a low is applied to the lamp−test input, all segment outputs are on. Pin Connection Diagram B 1 16 VCC C 2 LT 3 15 f 14 g BI/RBO 4 13 a RBI 5 12 b D 6 11 c A 7 10 d GND 8 9 e 16 9 1 8 .870 (22.0) Max .260 (6.6) Max .200 (5.08) Max .100 (2.54) .700 (17.78) .099 (2.5) Min