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74HC574 Datasheet, PDF (2/7 Pages) NXP Semiconductors – Octal D-type flip-flop; positive edge-trigger; 3-state | |||
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Philips Semiconductors
Octal D-type ï¬ip-ï¬op; positive
edge-trigger; 3-state
Product speciï¬cation
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 â574â is functionally identical to
the â564â, but has non-inverting
outputs.
The â574â is functionally identical to
the â374â, but has a different pinning.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
SYMBOL PARAMETER
CONDITIONS
tPHL/ tPLH
fmax
CI
CPD
propagation delay CP to Qn
maximum clock frequency
input capacitance
power dissipation capacitance per flip-flop
CL = 15 pF; VCC = 5 V
notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD Ã VCC2 Ã fi + â (CL Ã VCC2 Ã fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
â (CL Ã VCC2 Ã fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC â 1.5 V
TYPICAL
HC HCT
14 15
123 76
3.5 3.5
22 25
UNIT
ns
MHz
pF
pF
ORDERING INFORMATION
See â74HC/HCT/HCU/HCMOS Logic Package Informationâ.
December 1990
2
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