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SN54/74LS73A DUAL JK NEGATIVE EDGE-TRIGGERED FLIP-FLOP
The SN54LS / 74LS73A offers individual J, K, clear, and clock inputs. These dual flip-flops are designed so that when the clock goes HIGH, the inputs are enabled and data will be accepted. The logic level of the J and K inputs may be allowed to change when the clock pulse is HIGH and the bistable will perform according to the truth table as long as minimum set-up times are observed. Input data is transferred to the outputs on the negative-going edge of the clock pulse.
DUAL JK NEGATIVE EDGE-TRIGGERED FLIP-FLOP
LOW POWER SCHOTTKY
LOGIC DIAGRAM (Each Flip-Flop)
J SUFFIX CERAMIC CASE 632-08
14
Q 13 (8)
Q 12 (9)
1
CLEAR 2 (6) K 3 (10) 1 (15) CLOCK (CP) J 14 (7)
14 1
N SUFFIX PLASTIC CASE 646-06
14 1
D SUFFIX SOIC CASE 751A-02
ORDERING INFORMATION
SN54LSXXJ SN74LSXXN SN74LSXXD OUTPUTS K X h h l l Q L q L H q Q H q H L q Ceramic Plastic SOIC
MODE SELECT -- TRUTH TABLE
INPUTS OPERATING MODE CD Reset (Clear) Toggle Load "0" (Reset) Load "1" (Set) Hold L H H H H J X h l h l
LOGIC SYMBOL
14 1 3
J CP
Q
12
7 5
J CP
Q
9
H, h = HIGH Voltage Level L, I = LOW Voltage Level X = Don't Care l, h (q) = Lower case letters indicate the state of the referenced input (or output) one set-up time l, h (q) = prior to the HIGH to LOW clock transition.
KC Q D 2
13
10
KC Q D 6
8
VCC = PIN 4 GND = PIN 11
FAST AND LS TTL DATA 5-68
SN54/74LS73A
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
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL Output LOW Voltage 74 J, K Clear Clock IIH Input HIGH Current J, K Clear Clock Input LOW Current Short Circuit Current (Note 1) Power Supply Current J, K Clear, Clock - 20 0.1 0.3 0.4 - 0.4 - 0.8 -100 6.0 mA VCC = MAX, VIN = 7.0 V 0.35 0.5 20 60 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 V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for 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 fMAX tPLH tPHL Parameter Maximum Clock Frequency Propagation Delay, Clock to Output Min 30 Typ 45 15 15 20 20 Max Unit MHz ns Figure 1 ns Test Conditions Figure 1 VCC = 5.0 V CL = 15 pF
AC SETUP REQUIREMENTS (TA = 25C)
Limits Symbol tW tW ts th Parameter Clock Pulse Width High Clear Pulse Width Setup Time Hold Time Min 20 25 20 0 Typ Max Unit ns ns ns Figure 1 ns Test Conditions Figure 1 Figure 2 VCC = 5.0 V
FAST AND LS TTL DATA 5-69
SN54/74LS73A
AC WAVEFORMS
J or K * th(L) = 0 ts(L) CP 1.3 V tW(L) 1.3 V tW(H) tPHL Q 1.3 V tPLH 1.3 V 1 fMAX
1.3 V th(H) = 0 1.3 V
ts(H)
tPLH 1.3 V tPHL
Q
1.3 V
*The shaded areas indicate when the input is permitted to change for predictable output performance.
Figure 1. Clock to Output Delays, Data Set-Up and Hold Times, Clock Pulse Width
tW SET 1.3 V 1.3 V tW CLEAR tPLH 1.3 V tPHL Q
1.3 V tPHL 1.3 V tPLH
1.3 V
Q
1.3 V
1.3 V
Figure 2. Set and Clear to Output Delays, Set and Clear Pulse Widths
FAST AND LS TTL DATA 5-70
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