74AHC_AHCT374_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 12 June 2008 5 of 17
NXP Semiconductors
74AHC374; 74AHCT374
Octal D-type flip-flop; positive edge-trigger; 3-state
6. Functional description
[1] H = HIGH voltage level;
h = HIGH voltage level one setup time prior to the LOW-to-HIGH CP transition;
L = LOW voltage level;
l = LOW voltage level one setup time prior to the LOW-to-HIGH CP transition;
X = don’t care;
↑ = LOW-to-HIGH CP transition;
Z = high-impedance OFF-state.
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] For SO20 packages: above 70 °C the value of P
tot
derates linearly at 8 mW/K.
For TSSOP20 packages: above 60 °C the value of P
tot
derates linearly at 5.5 mW/K.
Table 3. Function table
[1]
Operating mode Control Input Internal
flip-flop
Output
OE CP Dn Q0 to Q7
Load and read register L ↑ lL L
L ↑ hH H
Load register and disable outputs H ↑ lL Z
H ↑ hH Z
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
V
CC
supply voltage −0.5 +7.0 V
V
I
input voltage −0.5 +7.0 V
I
IK
input clamping current V
I
< −0.5 V
[1]
−20 - mA
I
OK
output clamping current V
O
< −0.5 V or V
O
> V
CC
+ 0.5 V
[1]
−20 +20 mA
I
O
output current V
O
= −0.5 V to (V
CC
+ 0.5 V) −25 +25 mA
I
CC
supply current - +75 mA
I
GND
ground current −75 - mA
T
stg
storage temperature −65 +150 °C
P
tot
total power dissipation T
amb
= −40 °C to +125 °C
[2]
- 500 mW
