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| 4-BIT D LATCH The TTL/MSI SN54 / 74LS75 and SN54 / 74LS77 are latches used as temporary storage for binary information between processing units and input /output or indicator units. Information present at a data (D) input is transferred to the Q output when the Enable is HIGH and the Q output will follow the data input as long as the Enable remains HIGH. When the Enable goes LOW, the information (that was present at the data input at the time the transition occurred) is retained at the Q output until the Enable is permitted to go HIGH. The SN54 / 74LS75 features complementary Q and Q output from a 4-bit latch and is available in the 16-pin packages. For higher component density applications the SN54 / 74LS77 4-bit latch is available in the 14-pin package with Q outputs omitted. CONNECTION DIAGRAMS DIP (TOP VIEW) Q0 16 Q1 15 Q1 14 E0-1 GND 13 12 Q2 11 Q2 10 Q3 9 16 SN54/74LS75 SN54/74LS77 4-BIT D LATCH LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 1 SN54 / 74LS75 N SUFFIX PLASTIC CASE 648-08 1 1 Q0 Q0 14 2 D0 Q1 13 3 D1 4 5 E2-3 VCC NC 10 6 D2 Q2 9 7 D3 Q3 8 8 Q3 16 E0-1 GND 12 11 16 1 D SUFFIX SOIC CASE 751B-03 SN54 / 74LS77 J SUFFIX CERAMIC CASE 632-08 14 1 1 D0 PIN NAMES 2 D1 3 E2-3 4 VCC 5 D2 6 D3 7 NC LOADING (Note a) HIGH LOW 0.25 U.L. 1.0 U.L. 1.0 U.L. 5 (2.5) U.L. 5 (2.5) U.L. D1-D4 E0-1 E2-3 Q1-Q4 Q1-Q4 Data Inputs Enable Input Latches 0, 1 Enable Input Latches 2, 3 Latch Outputs (Note b) Complimentary Latch Outputs (Note b) 0.5 U.L. 2.0 U.L. 2.0 U.L. 10 U.L. 10 U.L. 14 1 N SUFFIX PLASTIC CASE 646-06 NOTES: a) 1 Unit Load (U.L.) = 40 A HIGH. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges. 14 1 D SUFFIX SOIC CASE 751A-02 TRUTH TABLE (Each latch) ORDERING INFORMATION tn D H L tn + 1 Q H L NOTES: tn = bit time before enable negative-going transition tn+1 = bit time after enable negative-going transition SN54LSXXJ SN74LSXXN SN74LSXXD Ceramic Plastic SOIC FAST AND LS TTL DATA 5-1 SN54/74LS75 LOGIC SYMBOLS SN54/74LS75 2 D0 E0-1 E2-3 3 D1 6 D2 7 D3 VCC = PIN 5 GND = PIN 12 12 3 1 SN54/74LS77 2 D1 5 D2 6 D3 VCC = PIN 4 GND = PIN 11 NC = PIN 7, 10 13 4 D0 E0-1 E2-3 Q0 14 Q0 Q0 Q1 Q1 Q2 Q2 Q3 Q3 16 1 15 14 10 11 9 8 Q1 13 Q2 9 Q3 8 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 54 Output HIGH Voltage 74 54, 74 VOL Output LOW Voltage 74 D Input E Input IIH Input HIGH Current D Input E Input Input LOW Current Short Circuit Current (Note 1) Power Supply Current D Input E Input - 20 0.1 0.4 - 0.4 -1.6 -100 12 mA VCC = MAX, VIN = 7.0 V 0.35 0.5 20 80 V A 2.7 3.5 0.25 0.4 V V 2.5 - 0.65 3.5 0.8 - 1.5 V V 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 = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VIN = 2.7 V IIL IOS ICC mA mA mA VCC = MAX, VIN = 0.4 V VCC = MAX 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, VCC = 5.0 V) Limits Symbol S bl tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter P Propagation Delay, Data to Q Propagation Delay, Data to Q Propagation Delay, Enable to Q Propagation Delay, Enable to Q Min Typ 15 9.0 12 7.0 15 14 16 7.0 Max 27 17 20 15 27 25 30 15 Unit Ui ns ns ns ns Test C di i T Conditions VCC = 5.0 V 50 CL = 15 pF FAST AND LS TTL DATA 5-2 SN54/74LS77 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 54 Output HIGH Voltage 74 54, 74 VOL Output LOW Voltage 74 D Input E Input IIH Input HIGH Current D Input E Input Input LOW Current Short Circuit Current (Note 1) Power Supply Current D Input E Input - 20 0.1 0.4 - 0.4 -1.6 -100 13 mA VCC = MAX, VIN = 7.0 V 0.35 0.5 20 80 V A 2.7 3.5 0.25 0.4 V V 2.5 - 0.65 3.5 0.8 - 1.5 V V 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 = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VIN = 2.7 V IIL IOS ICC mA mA mA VCC = MAX, VIN = 0.4 V VCC = MAX 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, VCC = 5.0 V) Limits Symbol S bl tPLH tPHL tPLH tPHL Parameter P Propagation Delay, Data to Q Propagation Delay, Enable to Q Min Typ 11 9.0 10 10 Max 19 17 18 18 Unit Ui ns ns VCC = 5.0 V CL = 15 pF Test C di i T Conditions FAST AND LS TTL DATA 5-3 SN54/74LS75 D SN54/74LS77 LOGIC DIAGRAM DATA ENABLE TO OTHER LATCH Q (SN54/74LS75 ONLY) Q GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 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 - 0.4 4.0 8.0 Unit V C mA mA AC SETUP REQUIREMENTS (TA = 25C, VCC = 5.0 V) Limits Symbol S bl tW ts th Parameter P Enable Pulse Width High Setup Time Hold Time Min 20 20 0 Typ Max Unit Ui ns ns ns VCC = 5.0 V 50 Test C di i T Conditions AC WAVEFORMS D 1.3 V ts E 1.3 V tPLH Q tPLH 1.3 V tPHL tPHL Q tPHL tPHL 1.3 V tPLH tPLH 1.3 V 1.3 V 1.3 V 1.3 V th 1.3 V DEFINITION OF TERMS SETUP TIME (ts) -- is defined as the minimum time required for the correct logic level to be present at the logic input prior to the clock transition from HIGH-to-LOW in order to be recognized and transferred to the outputs. HOLD TIME (th) -- is defined as the minimum time following the clock transition from HIGH-to-LOW that the logic level must be maintained at the input in order to ensure continued recognition. A negative HOLD TIME indicates that the correct logic level may be released prior to the clock transition from HIGH-to-LOW and still be recognized. FAST AND LS TTL DATA 5-4 |
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