带预置和清除两个D型触发器 DUAL D-TYPE FLIP FLOP WITH PRESET AND CLEAR
DESCRIPTION
The 74ACT74 is an advanced high-speed CMOS DUAL D-TYPE FLIP FLOP WITH PRESET AND
CLEAR fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS tecnology.
A signal on the D INPUT is transferred to the Q and QOUTPUTS during the positive going
transition of the clock pulse.
CLEAR and PRESET are independent of the clock and accomplished by a low setting on the
appropriate input. The device is designed to interface directly High Speed CMOS systems with TTL, NMOS and CMOS output voltage levels. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
■ HIGH SPEED: fMAX= 250MHz TYP. at VCC= 5V
■ LOW POWER DISSIPATION: ICC= 4µAMAX. at TA=25°C
■ COMPATIBLE WITH TTL OUTPUTS
VIH= 2V MIN., VIL = 0.8V MAX.
■ 50ΩTRANSMISSION LINE DRIVING CAPABILITY
■ SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL= 24mA MIN
■ BALANCED PROPAGATION DELAYS: tPLH ≅tPHL
■ OPERATING VOLTAGE RANGE: VCCOPR = 4.5V to 5.5V
■ PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 74
■ IMPROVED LATCH-UP IMMUNITY
