Functional Description
• 8-Bit Shift Register with Output Register
General
The 74HC594D is a high speed 8-BIT SHIFT REGISTER with Output Register fabricated with silicon gate
C2MOS technology.
It achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power
dissipation.
The 74HC594D contains an 8-bit static shift register which feeds an 8-bit storage register.
Shift operation is accomplished on the positive going transition of the SCK input. The output register is loaded
with the contents of the shift register on the positive going transition of the RCK input. Since RCK and SCK
signal are independent, parallel outputs can be held stable during the shift operation. And direct overriding clears
(SCLR and RCLR) are provided on both the shift and storage registers.
All inputs are equipped with protection circuits against static discharge or transient excess voltage.
Features
(1) High speed: fMAX = 55 MHz (typ.) at VCC = 5 V
(2) Low power dissipation: ICC = 4.0 μA (max) at Ta = 25
(3) Balanced propagation delays: tPLH ≈ tPHL
(4) Wide operating voltage range: VCC(opr) = 2.0 V to 6.0 V