Document
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
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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)
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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 maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. 1. The input and output voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 2. This value is limited to 5.5 V maximum. 3. The maximum package power dissipation was calculated using a junction temperature of 150°C.
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HD74LV74A
Recommended Operating Conditions
Item Supply voltage range Input voltage range Output voltage range Output current Symbol VCC VI VO I OH Min 2.0 0 0 — — — — I OL — — — — Input transition rise or fall rate ∆t /∆v 0 0 0 Operating free-air temperature Ta –40 Max 5.5 5.5 VCC –50 –2 –6 –12 50 2 6 12 200 100 20 85 °C ns/V µA mA Unit V V V µA mA VCC = 2.0 V VCC = 2.3 to 2.7 V VCC = 3.0 to 3.6 V VCC = 4.5 to 5.5 V VCC = 2.0 V VCC = 2.3 to 2.7 V VCC = 3.0 to 3.6 V VCC = 4.5 to 5.5 V VCC = 2.3 to 2.7 V VCC = 3.0 to 3.6 V VCC = 4.5 to 5.5 V Conditions
Note: Unused or floating inputs must be held high or low.
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HD74LV74A
Logic Diagram
PRE CLK C C C Q
TG C C C
C
D
TG
TG
TG Q
C CLR
C
C
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HD74LV74A
DC Electrical Characteristics
• Ta = –40 to 85°C
Item Input voltage Symbol VIH VCC (V)* 2.0 2.3 to 2.7 3.0 to 3.6 4.5 to 5.5 VIL 2.0 2.3 to 2.7 3.0 to 3.6 4.5 to 5.5 Output voltage VOH Min to Max 2.3 3.0 4.5 VOL Min to Max 2.3 3.0 4.5 Input current Quiescent supply current Output leakage current Input capacitance IIN ICC IOFF CIN 0 to 5.5 5.5 0 3.3 Min 1.5 VCC × 0.8 VCC × 0.8 VCC × 0.8 — — — — VCC – 0.1 2.0 2.48 3.8 — — — — — — — — Typ — — — — — — — — — — — — — — — — — — — 2.0 Max — — — — 0.3 VCC × 0.2 VCC × 0.2 VCC × 0.2 — — — — 0.1 0.4 0.44 0.55 ±1 20 5 — µA µA µA pF Unit V Test Conditions
V
IOL = –50 µA IOL = –2 mA IOL = –6 mA IOL = –12 mA
V
IOL = 50 µA IOL = 2 mA IOL = 6 mA IOL = 12 mA VIN = 5.5 V or GND VIN = VCC or GND, IO = 0 VO = 5.5 V VI = VCC or GND
Note: For conditions shown as Min or Max, use the appropriate values under recommended operating conditions.
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HD74LV74A
Switching Characteristics
• VCC = 2.5 ± 0.2 V
Ta = 25°C Item Maximum clock frequency Symbol tmax Min 50 Typ 100 Max — Ta = –40 to 85°C Min 40 Max — Unit MHz Test Conditions CL = 15 pF FROM (Input) TO (Output)
30 Propagation delay time tPLH tPHL — — — — Setup time tsu 8.0 7.0 Hold time Pulse width th tw 0.5 8.0 8.0
70 9.8 11.1 13.0 14.2 — — — — —
— 14.8 16.4 17.4 20.0 — — — — —
25 1.0 1.0 1.0 1.0 9.0 7.0 0.5 9.0 9.0
— 17.0 19.0 20.0 23.0 — — — — — ns ns ns ns
CL = 50 pF CL = 15 pF PRE/CLR CLK CL = 50 pF PRE/CLR CLK Data PRE or CLR inactive Q or Q Q or Q
PRE or CLR “L” CLK “H” or “L”
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HD74LV74A
Switching Characteristics (cont)
• VCC = 3.3 ± 0.3 V
Ta = 25°C Item Maximum clock frequency Symbol tmax Min 80 Typ 140 Max — Ta = –40 to 85°C Min 70 Max — Unit MHz Test Conditions CL = 15 pF FROM (Input) TO (Output)
50 Propagation delay time tPLH tPHL — — — — Setup time tsu 6.0 5.0 Hold time Pulse width th tw 0.5 6.0 6.0
90 6.9 7.9 9.2 10.2 — — — — —
— 12.3 11.9 15.8 15.4 — — —.