Octal D Type Flip Flops With 3 State Outputs
(Previous ADE-205-042A (Z))
The HD74BC574A provides high drivability and operation equal to or better than high speed bipolar standard logic IC
by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC,
when the frequency is 10 MHz. The device has eight edge triger D type flip flops with three state outputs in a 20 pin
package. Data at the D inputs meeting set up requirements, are transferred to the Q outputs on positive going transitions
of the clock input. When the latch enable goes low, data at the D inputs will be retained at the outputs until latch enable
returns high again. When a high logic level is applied to the output control input, all outputs go to a high impedance
state, regardless of what signals are present at the other inputs and the state of the strage elements.
• Input/Output are at high impedance state when power supply is off.
• Built in input pull up circuit can make input pins be open, when not used.
• TTL level input
• Wide operating temperature range
Ta = –40 to + 85°C
• Ordering Information
Package Type Package Code
SOP-20 pin (JEITA) FP-20DAV
EL (2,000 pcs/reel)
H : High level
L : Low level
X : Immaterial
Z : High impedance
: Low to high transition
Q0 : Level of Q before the indicated steady state input conditions were established.
Rev.3.00, Jul.16.2004, page 1 of 7