MM74HC74A General Description
The MM74HC74A utilizes advanced silicon-gate CMOS technology to achieve operating speeds similar to the equivalent LS-TTL part. It possesses the high noise immu- nity and low power consumption of standard CMOS inte-
grated circuits, along with the ability to drive 10 LS-TTL loads.
This flip-flop has independent data, preset, clear, and clock inputs and Q and Q outputs. The logic level present at the data input is transferred to the output during the positive- going transition of the clock pulse. Preset and clear are independent of the clock and accomplished by a low level at the appropriate input.
MM74HC74A Maximum Ratings
Supply Voltage (VCC ) -0.5 to +7.0V
DC Input Voltage (VIN ) - 1.5 to VCC +1.5V
DC Output Voltage (VOUT ) - 0.5 to VCC+ 0.5V
Clamp Diode Current (IIK , IOK ) ±20 mA
DC Output Current, per pin (IOUT ) ± 25 mA
DC VCC or GND Current, per pin (ICC ) ± 50 mA
Storage Temperature Range (TSTG ) -65 to +150
Power Dissipation (PD )
(Note 4) 600 mW
S.O. Package only 500 mW
Lead Temperature (TL )
(Soldering 10 seconds) 260°C
MM74HC74A Features
Typical propagation delay: 20 ns
Wide power supply range: 26V
Low quiescent current: 40 A maximum (74HC Series)
Low input current: 1 A maximum
Fanout of 10 LS-TTL loads
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