Dual D-type Flip Flops with Preset and Clear
Description
HD74LV74A
Dual D–type Flip Flops with Preset and Clear
ADE-205-244 (Z) 1st Edition March 1999 Description
The HD74LV74A has independent data, preset, clear, and clock inputs Q and Q outputs in a 14 pin package.
The input data is transferred to the output at the rising edge of clock pulse CLK.
Low-voltage and high-speed operation is suitable for the battery-powered products (e.
g.
, notebook computers), and the low-power consumption extends the battery life.
Features
• • • • • • VCC = 2.
0 V to 5.
5 V operation All inputs VIH (Max.
) = 5.
5 V (@VCC = 0 V to 5.
5 V) All outputs VO (Max.
) = 5.
5 V (@VCC = 0 V) Typical VOL ground bounce < 0.
8 V (@VCC = 3.
3 V, Ta = 25°C) Typical VOH undershoot > 2.
3 V (@VCC = 3.
3 V, Ta = 25°C) Output current ±6 mA (@VCC = 3.
0 V to 3.
6 V), ±12 mA (@VCC = 4.
5 V to 5.
5 V)
HD74LV74A
Function Table
Inputs PRE L H L H H H CLR H L L H H H CLK X X X ↑ ↑ ↓ D X X X H L X Outputs Q H L H* H L Q0
1
Q L H H*1 L H Q0
Note: H: High level L: Low level X: Immaterial ↑: Low to high transition ↓: High to low transition Q0:The level of Q immediately before the input conditions shown in the above table are determined.
1.
: Q and Q will remain HIGH as long as Preset and Clear are Low, but Q and Q are unpredictable, if Preset and Clear go HIGH simultaneously.
Pin Arrangement
1CLR 1 1D 1CLK 2 3
14 VCC 13 2CLR 12 2D 11 2CLK 10 2PRE 9 2Q 8 2Q
1PRE 4 1Q 1Q 5 6
GND 7
(Top view)
2
HD74LV74A
Absolute Maximum Ratings
Item Supply voltage range Input voltage range*
1 1, 2
Symbol VCC VI VO
Ratings –0.
5 to 7.
0 –0.
5 to 7.
0 –0.
5 to VCC + 0.
5 –0.
5 to 7.
0
Unit V V V
Conditions
Output voltage range*
Output: H or L VCC: OFF
Input clamp current Output clamp current Continuous output current Continuous current through VCC or GND Maximum power dissipation at Ta = 25°C (in still air)*3
I IK I OK IO I CC or IGND PT
–20 ±50 ±25 ±50 785 500
mA mA mA mA mW
VI < 0 VO < 0 or VO > VCC VO = 0 to VCC
SOP TSSOP
Storage temperature
Tstg
–65 to 150
°C
Notes: The absolute m...
Similar Datasheet
