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74HC374N.. |74HC374NNXPN/a38avai74HC/HCT374; Octal D-type flip-flop; positive edge-trigger; 3-state
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74HC374N..-74HCT374N-74HCT374PW
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/HCT374
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/HCT374 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/HCT374 are octal D-type flip-flops featuring
separate D-type inputs for each flip-flop and 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 times 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 input does not affect the state of the flip-flops.
The “374” is functionally identical to the “534”, but has
non-inverting outputs.
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− 1.5V
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/HCT374
PIN DESCRIPTION
Philips Semiconductors Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state 74HC/HCT374
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 one set-up time prior to the LOW-to-HIGH CP
transition= high impedance OFF-state= LOW-to-HIGH CP transition
Philips Semiconductors Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state 74HC/HCT374
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 =50pF
Philips Semiconductors Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state 74HC/HCT374
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 =50pF
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