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| SN54/74LS47 BCD TO 7-SEGMENT DECODER/DRIVER The SN54 / 74LS47 are Low Power Schottky BCD to 7-Segment Decoder / Drivers consisting of NAND gates, input buffers and seven AND-OR-INVERT gates. They offer active LOW, high sink current outputs for driving indicators directly. Seven NAND gates and one driver are connected in pairs to make BCD data and its complement available to the seven decoding AND-OR-INVERT gates. The remaining NAND gate and three input buffers provide lamp test, blanking input / ripple-blanking output and ripple-blanking input. The circuits accept 4-bit binary-coded-decimal (BCD) and, depending on the state of the auxiliary inputs, decodes this data to drive a 7-segment display indicator. The relative positive-logic output levels, as well as conditions required at the auxiliary inputs, are shown in the truth tables. Output configurations of the SN54 / 74LS47 are designed to withstand the relatively high voltages required for 7-segment indicators. These outputs will withstand 15 V with a maximum reverse current of 250 A. Indicator segments requiring up to 24 mA of current may be driven directly from the SN74LS47 high performance output transistors. Display patterns for BCD input counts above nine are unique symbols to authenticate input conditions. The SN54 / 74LS47 incorporates automatic leading and / or trailing-edge zero-blanking control (RBI and RBO). Lamp test (LT) may be performed at any time which the BI / RBO node is a HIGH level. This device also contains an overriding blanking input (BI) which can be used to control the lamp intensity by varying the frequency and duty cycle of the BI input signal or to inhibit the outputs. BCD TO 7-SEGMENT DECODER/ DRIVER LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 16 1 16 1 N SUFFIX PLASTIC CASE 648-08 * * * * * Lamp Intensity Modulation Capability (BI/RBO) Open Collector Outputs Lamp Test Provision Leading / Trailing Zero Suppression Input Clamp Diodes Limit High-Speed Termination Effects CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 f 15 g 14 a 13 b 12 c 11 d 10 e 9 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION SN54LSXXJ SN74LSXXN SN74LSXXD Ceramic Plastic SOIC LOGIC SYMBOL 712635 1 B PIN NAMES A, B, C, D RBI LT BI / RBO a, to g BCD Inputs Ripple-Blanking Input Lamp-Test Input Blanking Input or Ripple-Blanking Output Outputs 2 C 3 4 5 6 D 7 A HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 1.2 U.L. Open-Collector 8 GND LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.75 U.L. 2.0 U.L. 15 (7.5) U.L. A B C D LT RBI BI/ f g RBO LT BI / RBO RBI LOADING (Note a) a bcd e 13 12 11 10 9 15 14 4 VCC = PIN 16 GND = PIN 8 NOTES: a) 1 Unit Load (U.L.) = 40 A HIGH, 1.6 mA LOW. b) Output current measured at VOUT = 0.5 V The Output LOW drive factor is 7.5 U.L. for Military (54) and 15 U.L. for Commercial (74) Temperature Ranges. FAST AND LS TTL DATA 5-56 SN54/74LS47 LOGIC DIAGRAM a A b B INPUT C D d BLANKING INPUT OR RIPPLE-BLANKING OUTPUT d c c OUTPUT b a e e f LAMP-TEST INPUT RIPPLE-BLANKING INPUT f g g 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 NUMERICAL DESIGNATIONS -- RESULTANT DISPLAYS TRUTH TABLE INPUTS DECIMAL OR FUNCTION 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BI RBI LT OUTPUTS LT H H H H H H H H H H H H H H H H X H L RBI H X X X X X X X X X X X X X X X X L X D L L L L L L L L H H H H H H H H X L X C L L L L H H H H L L L L H H H H X L X B L L H H L L H H L L H H L L H H X L X A L H L H L H L H L H L H L H L H X L X BI/RBO H H H H H H H H H H H H H H H H L L H a L H L L H L H L L L H H H L H H H H L b L L L L L H H L L L H H L H H H H H L c L L H L L L L L L L H L H H H H H H L d L H L L H L L H L H L L H L L H H H L e L H L H H H L H L H L H H H L H H H L f L H H H L L L H L L H H L L L H H H L g H H L L L L L H L L L L L L L H H H L NOTE A A B C D H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial NOTES: (A) BI/RBO is wire-AND logic serving as blanking Input (BI) and/or ripple-blanking output (RBO). The blanking out (BI) must be open or held at a HIGH level when output functions 0 through 15 are desired, and ripple-blanking input (RBI) must be open or at a HIGH level if blanking of a decimal 0 is not desired. X = input may be HIGH or LOW. (B) When a LOW level is applied to the blanking input (forced condition) all segment outputs go to a LOW level regardless of the state of any other input condition. (C) When ripple-blanking input (RBI) and inputs A, B, C, and D are at LOW level, with the lamp test input at HIGH level, all segment outputs go to a HIGH level and the ripple-blanking output (RBO) goes to a LOW level (response condition). (D) When the blanking input/ripple-blanking output (BI/RBO) is open or held at a HIGH level, and a LOW level is applied to lamp test input, all segment outputs go to a LOW level. FAST AND LS TTL DATA 5-57 SN54/74LS47 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL VO (off) IO (on) Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low BI / RBO BI / RBO BI / RBO Parameter 54 74 54 74 54, 74 54 74 54, 74 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 50 1.6 3.2 15 12 24 Unit V C A mA V mA Off-State Output Voltage a to g On-State Output Current a to g On-State Output Current a to g DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH VOL IO (off) VO (on) IIH IIL IOS BI / RBO ICC Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage, BI / RBO Output LOW Voltage BI / RBO Off-State Output Current a thru g On-State Output Voltage a thru g Input HIGH Current Input LOW Current BI/ RBO Any Input except BI / RBO Output Short Circuit Current (Note 1) Power Supply Current - 0.3 7.0 54, 74 74 0.25 0.35 54, 74 74 2.4 54 74 - 0.65 4.2 0.25 0.35 0.4 0.5 250 0.4 0.5 20 0.1 - 1.2 - 0.4 -2.0 13 Min 2.0 0.7 0.8 - 1.5 Typ Max Unit V V V V V V A V V A mA mA mA mA Test Conditions Guaranteed Input HIGH Theshold Voltage for All Inputs Guaranteed Input LOW Threshold Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = - 50 A, VIN = VIN or VIL per Truth Table IOL = 1.6 mA IOL = 3.2 mA VCC = MIN, VIN = VIN or VIL per Truth Table VCC = MAX, VIN = VIN or VIL per Truth Table, VO (off) = 15 V IO (on) = 12 mA IO (on) = 24 mA VCC = MAX, VIN = VIH or VIL per Truth Table VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX, VOUT = 0 V VCC = MAX Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25C) Limits Symbol tPHL tPLH tPHL tPLH Parameter Propagation Delay, Address Input to Segment Output Propagation Delay, RBI Input To Segment Output Min Typ Max 100 100 100 100 Unit ns ns ns ns Test Conditions VCC = 5.0 V CL = 15 pF AC WAVEFORMS 1.3 V tPHL VOUT 1.3 V 1.3 V tPLH 1.3 V VOUT VIN VIN 1.3 V tPHL 1.3 V 1.3 V tPLH 1.3 V Figure 1 Figure 2 FAST AND LS TTL DATA 5-58 |
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