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74HC574DB-74HCT574D-74HCT574DB-74HCT574N-74HCT574PW
74HC/HCT574; Octal D-type flip-flop; positive edge-trigger; 3-state

Philips Semiconductors Product specification
Octal D-type flip-flop; positive
edge-trigger; 3-state 74HC/HCT574
FEATURES
3-state non-inverting outputs for
bus oriented applications 8-bit positive edge-triggered
register Common 3-state output enable
input Independent register and 3-state
buffer operation Output capability: bus driver ICC category: MSI
GENERAL DESCRIPTION

The 74HC/HCT574 are high-speed
Si-gate CMOS devices and are pin
compatible with low power Schottky
TTL (LSTTL). They are specified in
compliance with JEDEC standard
no. 7A.
The 74HC/HCT574 are octal D-type
flip-flops featuring separate D-type
inputs for each flip-flop and
non-inverting 3-state outputs for bus
oriented applications. A clock (CP)
and an output enable (OE) input are
common to all flip-flops.
The 8 flip-flops will store the state of
their individual D-inputs that meet the
set-up and hold time requirements on
the LOW-to-HIGH CP transition.
When OE is LOW, the contents of the
8 flip-flops are available at the
outputs.
When OE is HIGH, the outputs go to
the high impedance OFF-state.
Operation of the OE input does not
affect the state of the flip-flops.
The “574” is functionally identical to
the “564”, but has non-inverting
outputs.
The “574” is functionally identical to
the “374”, but has a different pinning.
QUICK REFERENCE DATA

GND= 0 V; Tamb =25 °C; tr =tf= 6 ns
Notes
CPD is used to determine the dynamic power dissipation (PD in μW): =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:= input frequency in MHz= output frequency in MHz
∑ (CL × VCC2 × fo)= sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI= GND to VCC
For HCT the condition is VI= GND to VCC − 1.5 V
ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.
Philips Semiconductors Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state 74HC/HCT574
PIN DESCRIPTION
Philips Semiconductors Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state 74HC/HCT574
FUNCTION TABLE
Notes
H= HIGH voltage level= HIGH voltage level one set-up time prior to the LOW-to-HIGH
CP transition= LOW voltage level= LOW voltage level on set-up time prior to the LOW-to-HIGH
CP transition= HIGH impedance OFF-state= LOW-to-HIGH clock transition
Philips Semiconductors Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state 74HC/HCT574
DC CHARACTERISTICS FOR 74HC

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC

GND= 0 V; tr =tf= 6 ns; CL= 50 pF
Philips Semiconductors Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state 74HC/HCT574
DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
Note to HCT types

The value of additional quiescent supply current (ΔICC) for a unit load of 1 is given in the family specifications.
To determine ΔICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT

GND= 0 V; tr =tf= 6 ns; CL= 50 pF
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