TECHNICAL DATA
1
Dual D Flip-Flop with Set and Rese t
Each of the two independent positive edge-triggered flip-flops in
this circuit has individual Data, Clock, Set and Reset inputs, and
complementary Q and Q outputs.
• Switching specifications at 50 pF
• Switching specifications guaranteed over full temperature and VCC
range
• Functionally and pin-for-pin compatible with Schottky and LS TTL
counterpart
• Improved AC performance over LS74 at approximately half the
power
IN74ALS74
ORDERING INFORMATION
IN74ALS74N Plastic
IN74ALS74D SOIC
TA = -10° to 70° C
for all packages
LOGIC DIAGRAM
PIN 14 =VCC
PIN 7 = GND
PIN ASSIGNMENT
FUNCTION TABLE
Inputs Outputs
Set Reset Clock Data Q Q
LH X XHL
HL X XLH
LL X XH
*H*
HH HHL
HH LLH
H H L X No Cha nge
H H H X No Change
H H X No Change
*Both outputs will remain high as long as Set
and Reset are low, but the output states are
unpre dictable if Set a nd Reset go hi gh
simultaneously.
X = don’t care
IN74ALS74
2
MAXIMUM RATINGS*
Symbol Parameter Value Unit
VCC Supply Voltage 7.0 V
VIN Input Voltage 7.0 V
VOUT Output Voltage 5.5 V
Tstg Storage Temperature Range -65 to +150 °C
*Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
VCC Supply Voltage 4.5 5.5 V
VIH High Level Input Voltage 2.0 V
VIL Low Level Input Voltage 0.8 V
IOH High Level Output Current -0.4 mA
IOL Low Level O utput Current 8.0 mA
TAAmbient Temperature Range -10 +70 °C
DC ELECTRICAL CHARACTERISTICS over full operating conditions
Guaranteed Limit
Symbol Parameter Test Conditions Min Ma x Unit
VIK Input Clamp Voltage VCC = min, IIN = -18 mA -1.5 V
VOH High Level Output Volt age VCC = min, IOH = -0.4 mA 2.5 V
VOL Low Level Output Voltage VCC = min, IOL = 4 mA 0.4 V
VCC = min, IOL = 8 mA 0.5
IIH High Level Input Current VCC = max, VIN = 2.7 V 20 µA
VCC = max, VIN = 7.0 V 0.1 mA
IIL Low Level Input Current VCC = max, Clock, Da ta -0.2 mA
VIN = 0.4 V Reset, Set -0.4
IOOutput Short Circuit Current VCC = max, VO = 2.25 V -15 -70 mA
ICC Supply Current VCC = max (Note 1) 4.0 mA
Note 1. ICC is measured with Data, Clock and Reset grounded, then with Data, Clock and Set grounded.
IN74ALS74
3
AC ELECTRICAL CHARACTERISTICS over full operating conditions (VCC = 5.0 V±10%,
CL = 50 pF, RL = 500 Ω, Input tr = tf = 2.0 ns)
Symbol Parameter Min Max Unit
fmax Maximum Clock Fr equency 30 MHz
tPLH Propagation Delay Time, Clock to Q or Q 16 ns
tPHL Propagatio n Delay Time, Clock to Q or Q 18 ns
tPLH Propagation Delay Time, Set or Reset to Q or Q 13 ns
tPHL Propa gation Delay Time, Set or Reset to Q or Q 15 ns
tsu Setup Time, Data to Clock 15 ns
thHold T ime, Clock to Data 0 ns
trec Recovery Time, Set or Reset Inactive to Clock 10 ns
twPulse Width, Clock 14.5 ns
twPulse Width, Set or Reset 15 ns
Figure 1. Switching Waveforms Figure 2. Switching Waveforms
* Includes all probe and jig capacitance
Figure 3. Switching Waveforms Figure 4. Test Circuit
