16-bit D-type Flip Flops with 3-state Outputs
The HD74ALVCH16374 has sixteen edge trigger D type flip flops with three state outputs in a 48 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 storage elements. Low voltage and high speed
operation is suitable at the battery drive product (note type personal computer) and low power consumption extends the
life of a battery for long time operation.
• VCC = 2.3 V to 3.6 V
• Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)
• Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)
• High output current ±24 mA (@VCC = 3.0 V)
• Bus hold on data inputs eliminates the need for external pullup / pulldown resistors.
L H or L X
H : High level
L : Low level
X : Immaterial
Z : High impedance
↑ : Low to high transition
Q0 : Level of Q before the indicated steady input conditions were established.
Rev.5.00, Jan.20.2005, page 1 of 8