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| BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS The SN54/74LS247 thru SN54/74LS249 are BCD-to-Seven-Segment Decoder/Drivers. The LS247 and LS248 are functionally and electrically identical to the LS47 and LS48 with the same pinout configuration. The LS249 is a 16-pin version of the 14-pin LS49 and includes full functional capability for lamp test and ripple blanking which was not available in the LS49. The composition of all characters, except the 6 and 9 are identical between the LS247, 248, 249 and the LS47, 48 and 49. The LS47 thru 49 compose the and without tails, the LS247 thru 249 compose the and with the tails. The LS247 has active-low outputs for direct drive of indicators. The LS248 and 249 have active-high outputs for driving lamp buffers. All types feature a lamp test input and have full ripple-blanking input/output controls. On all types an automatic leading and/or trailing-edge zero-blanking control (RBI and RBO) is incorporated and an overriding blanking input (BI) is contained which may be used to control the lamp intensity by pulsing or to inhibit the output's lamp test may be performed at any time when the BI/RBO node is at high level. Segment identification and resultant displays are shown below. Display pattern for BCD input counts above 9 are unique symbols to authenticate input conditions. LS247 SN54/74LS247 SN54/74LS248 SN54/74LS249 BCD-TO-SEVEN-SEGMENT DECODERS/ DRIVERS LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 16 1 16 1 N SUFFIX PLASTIC CASE 648-08 * Open-Collector Outputs Drive Indicators Directly * Lamp-Test Provision * Leading / Trailing Zero Suppression LS248 * Internal Pull-Ups Eliminate Need for External Resistors * Lamp-Test Provision * Leading / Trailing Zero Suppression LS249 * Open-Collector Outputs * Lamp-Test Provision * Leading / Trailing Zero Suppression 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 NUMERICAL DESIGNATIONS AND RESULTANT DISPLAYS a f e d g b c SEGMENT IDENTIFICATION FAST AND LS TTL DATA 5-1 SN54/74LS247 * SN54/74LS248 * SN54/74LS249 SN54 / 74LS248 SN54 / 74LS259 (TOP VIEW) OUTPUTS c 11 d 10 e 9 VCC 16 f 15 g 14 f g a 13 b 12 c 11 d 10 e 9 SN54 / 74LS247 (TOP VIEW) OUTPUTS VCC 16 f 15 g 14 f g a 13 b 12 abcde abcde BI/ B C LT RBORBI D A BI/ B C LT RBORBI D A 1 B 2 C INPUTS 3 4 LAMP RB TEST OUT PUT 5 RB IN PUT 6 D 7 A 8 GND 1 B 2 C INPUTS INPUTS 3 4 LAMP RB TEST OUT PUT 5 RB IN PUT 6 D 7 A 8 GND INPUTS ALL CIRCUIT TYPES FEATURE LAMP INTENSITY MODULATION CAPABILITY DRIVER OUTPUTS TYPE SN54LS247 SN54LS248 SN54LS249 SN74LS247 SN74LS248 SN74LS249 ACTIVE LEVEL low high high low high high OUTPUT CONFIGURATION open-collector 2.0 k pull-up open-collector open-collector 2.0 k pull-up open-collector SINK CURRENT 12 mA 2.0 mA 4.0 mA 24 mA 6.0 mA 8.0 mA MAX VOLTAGE 15 V 5.5 V 5.5 V 15 V 5.5 V 5.5 V TYPICAL POWER DISSIPATION 35 mW 125 mW 40 mW 35 mW 125 mW 40 mW LOGIC DIAGRAM LS247 (13) INPUT (7) A INPUT (1) B INPUT (2) C INPUT (6) D BI/RBO BLANKING (4) INPUT OR RIPPLE-BLANKING OUTPUT (3) (14) (12) OUTPUT a INPUT (7) A OUTPUT b OUTPUT c OUTPUT d OUTPUT e OUTPUT f OUTPUT g LAMP TEST INPUT (3) (14) INPUT (1) B INPUT (2) C INPUT (6) D BLANKING (4) INPUT OR RIPPLE-BLANKING OUTPUT (12) LS248, LS249 (13) OUTPUT a OUTPUT b OUTPUT c OUTPUT d OUTPUT e OUTPUT f OUTPUT g (11) (11) (10) (10) (9) (9) (15) (15) LAMP TEST INPUT RBI (5) RIPPLE-BLANKING INPUT RIPPLE-BLANKING (5) INPUT FAST AND LS TTL DATA 5-2 SN54/74LS247 * SN54/74LS248 * SN54/74LS249 LS247 FUNCTION TABLE DECIMAL OR FUNCTION 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BI RBI LT INPUTS BI/RBO 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 H H H H H H H H H H H H H H H H L L H a ON OFF ON ON OFF ON ON ON ON ON OFF OFF OFF ON OFF OFF OFF OFF ON b ON ON ON ON ON OFF OFF ON ON ON OFF OFF ON OFF OFF OFF OFF OFF ON c ON ON OFF ON ON ON ON ON ON ON OFF ON OFF OFF OFF OFF OFF OFF ON d ON OFF ON ON OFF ON ON OFF ON ON ON ON OFF ON ON OFF OFF OFF ON e ON OFF ON OFF OFF OFF ON OFF ON OFF ON OFF OFF OFF ON OFF OFF OFF ON f ON OFF OFF OFF ON ON ON OFF ON ON OFF OFF ON ON ON OFF OFF OFF ON g OFF OFF ON ON ON ON ON OFF ON ON ON ON ON ON ON OFF OFF OFF ON 2 3 4 OUTPUTS NOTE 1 LS248, LS249 FUNCTION TABLE DECIMAL OR FUNCTION 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BI RBI LT INPUTS BI/RBO 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 H H H H H H H H H H H H H H H H L L H a H L H H L H H H H H L L L H L L L L H b H H H H H L L H H H L L H L L L L L H c H H L H H H H H H H L H L L L L L L H d H L H H L H H L H H H H L H H L L L H e H L H L L L H L H L H L L L H L L L H f H L L L H H H L H H L L H H H L L L H g L L H H H H H L H H H H H H H L L L H 2 3 4 1 1 OUTPUTS NOTE 1 H = HIGH Level, L = LOW Level, X = Irrelevant NOTES: 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 NOTES: 1. be open or high if blanking of a decimal zero is not desired. 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. 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 NOTES: 1. ripple-blanking output (RBO) goes to a low level (response condition). 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. BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO). FAST AND LS TTL DATA 5-3 SN54/74LS247 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL VO(off) IO(on) Supply Voltage Operating Ambient Temperature Range Output Current -- High BI / RBO Output Current -- Low BI / RBO Off-State Output Voltage a - g On-State Output Current a - g On-State Output Current a - g 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 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VIK VOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage Output HIGH Voltage p g BI / RBO Output LOW Voltage p g BI / RBO Off-State Output Current a-g On-State Output Voltage p g a-g Input HIGH Current 0.1 Input LOW Current Any Input, except BI / RBO BI / RBO IOS ICC Short Circuit Current BI / RBO (Note 1) Power Supply Current - 0.3 7.0 - 0.4 - 1.2 - 2.0 13 mA mA VCC = MAX VCC = MAX 54 74 54, 74 74 54, 74 54, 74 74 0.25 0.35 2.4 2.4 - 0.65 4.2 4.2 0.25 0.35 0.4 0.5 250 0.4 0.5 20 IIH 0.8 - 1.5 V V V V V A V V A mA Min 2.0 0.7 V Typ Max Unit Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA , , VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 1.6 mA IOL = 3.2 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VOL IO(off) VO(on) VCC = MAX, VIH = 2.0 V, VO(off) = 15 V, VIL = MAX IO(on) = 12 mA IO(on) = 24 mA VCC = MIN, VIH = 2.0 V, , , VIL per Truth Table VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V , IIL mA Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (VCC = 5.0 V, TA = 25C) Limits S bl Symbol tPLH tPHL tPHL tPLH P Parameter Turn-Off Time from A Input Turn-On Time from A Input Turn-Off Time from RBI Input Turn-On Time from RBI Input Min Typ Max 100 100 100 100 Ui Unit ns ns T Test C di i Conditions CL = 15 p , pF, RL = 665 FAST AND LS TTL DATA 5-4 SN54/74LS248 GUARANTEED OPERATING RANGES Symbol VCC TA IOH Supply Voltage Operating Ambient Temperature Range Output Current -- High BI / RBO Output Current -- High IOL a-g 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 - 100 1.6 3.2 2.0 6.0 mA Unit V C A Output Current -- Low BI / RBO Output Current -- Low BI / RBO Output Current -- Low a - g Output Current -- Low a - g DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VIK VOH IOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage Output HIGH Voltage p g a - g and BI / RBO Output Current a-g Output LOW Voltage a-g VOL BI / RBO 54 74 54, 74 2.4 2.4 - 1.3 - 0.65 4.2 4.2 - 2.0 0.8 - 1.5 V V V mA Min 2.0 0.7 V Typ Max Unit Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH , , or VIL per Truth Table VCC = MIN, VO = 0.85 V, Input Conditions as for VOH IOL = 2.0 mA IOL = 6.0 mA V 74 IIH Input HIGH Current p Any Input, except BI / RBO Input LOW Current Any Input, except BI / RBO BI / RBO IOS ICC Short Circuit Current BI / RBO (Note 1) Power Supply Current - 0.3 25 0.35 0.5 20 0.1 - 0.4 - 1.2 - 2.0 38 mA mA VCC = MAX VCC = MAX A mA IOL = 1.6 mA IOL = 3.2 mA VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V , VCC = MAX, VIN = 0.4 V VCC = MIN, VIH = 2.0 V, MIN 20V VIL = per Truth Table 54, 74 74 54, 74 0.25 0.35 0.25 0.4 0.5 0.4 V IIL mA Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (VCC = 5.0 V, TA = 25C) Limits Symbol S bl tPLH tPHL tPHL tPLH Parameter P Propagation Delay Time, High-to-Low-Level Output from A Input Propagation Delay Time, Low-to-High-Level Output from A Input Propagation Delay Time, High-to-Low-Level Output from RBI Input Propagation Delay Time, Low-to-High-Level Output from RBI Input Min Typ Max 100 100 100 100 Unit Ui ns ns Test C di i T Conditions CL = 15 pF RL = 4.0 k CL = 15 pF RL = 6.0 k FAST AND LS TTL DATA 5-5 SN54/74LS249 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL VOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High BI / RBO Output Current -- Low BI / RBO Output Current -- Low BI / RBO Output Voltage -- High a - g Output Current -- Low a - g Output Current -- Low a - g 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 5.5 4.0 8.0 Unit V C A mA V mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VIK VOH IOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage Output HIGH Voltage p g BI / RBO Output HIGH Current a-g Output LOW Voltage BI / RBO VOL a-g 54 74 54, 74 2.4 2.4 - 0.65 4.2 4.2 250 0.8 - 1.5 V V V A Min 2.0 0.7 V Typ Max Unit Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH , , or VIL per Truth Table VCC = MIN, VIH = 2.0 V, VOH = 5.5 V, VIL = MAX IOL = 1.6 mA IOL = 3.2 mA V 74 IIH Input HIGH Current p Any Input, except BI / RBO Input LOW Current Any Input, except BI / RBO BI / RBO IOS ICC Short Circuit Current BI / RBO (Note 1) Power Supply Current - 0.3 8.0 0.35 0.5 20 0.1 - 0.4 - 1.2 - 2.0 15 mA mA VCC = MAX VCC = MAX A mA IOL = 4.0 mA IOL = 8.0 mA VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V , VCC = MIN, VIH = 2.0 V, MIN 20V VIL = per Truth Table 54, 74 74 54, 74 0.25 0.35 0.25 0.4 0.5 0.4 V IIL mA Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (VCC = 5.0 V, TA = 25C) Limits S bl Symbol tPHL tPLH tPHL tPLH P Parameter Propagation Delay Time, High-to-Low-Level Output from A Input Propagation Delay Time, Low-to-High-Level Output from A Input Propagation Delay Time, High-to-Low-Level Output from RBI Input Propagation Delay Time, Low-to-High-Level Output from RBI Input Min Typ Max 100 100 100 100 Ui Unit ns ns T Test C di i Conditions CL = 15 pF, RL = 2.0 CL = 15 pF, RL = 6.0 FAST AND LS TTL DATA 5-6 |
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