Document
HD74LV126A
Quad. Bus Buffer Gates with 3-state Outputs
ADE-205-259 (Z) 1st Edition March 1999 Description
The HD74LV126A features independent line drivers with three state outputs. Each output is disabled when the associated output enable (OE) input is low. To ensure the high impedance state during power up or power down, OE should be connected to GND through a pull-down resistor; the minimum value of the resistor is determined by the current souring capability of the driver. 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 ±8 mA (@VCC = 3.0 V to 3.6 V), ±16 mA (@VCC = 4.5 V to 5.5 V)
Function Table
Inputs OE H H L Note: H: L: X: Z: High level Low level Immaterial High impedance A H L X Output Y H L Z
HD74LV126A
Pin Arrangement
1OE 1 1A 2 1Y 3 2OE 4 2A 5 2Y 6 GND 7
14 VCC 13 4OE 12 4A 11 4Y 10 3OE 9 3A 8 3Y
(Top view)
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HD74LV126A
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 or Output: Z
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 ±35 ±70 785 500
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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HD74LV126A
Recommended Operating Conditions
Item Supply voltage range Input voltage range Output voltage range Symbol VCC VI VO Min 2.0 0 0 0 Output current I OH — — — — 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 5.5 –50 –2 –8 –16 50 2 8 16 200 100 20 85 °C ns/V µA mA µA mA Unit V V V H or L High impedance state 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.
Logic Diagram
1OE 1A 2OE 2A 3OE 3A 4OE 4A
1 2 3
1Y
4 5 10 9 13 12 11 8 6
2Y
3Y
4Y
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HD74LV126A
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 Off-state output current Quiescent supply current Output leakage current Input capacitance IIN IOZ ICC IOFF CIN 0 to 5.5 5.5 5.5 0 3.3 Min 1.5 VCC × 0.7 VCC × 0.7 VCC × 0.7 — — — — VCC – 0.1 2.0 2.48 3.8 — — — — — — — — — Typ — — — — — — — — — — — — — — — — — — — — 3 Max — — — — 0.5 VCC × 0.3 VCC × 0.3 VCC × 0.3 — — — — 0.1 0.4 0.44 0.55 ±1 ±5 20 5 — µA µA µA µA pF V IOH = –50 µA IOH = –2 mA IOH = –8 mA IOH = –16 mA IOL = 50 µA IOL = 2 mA IOL = 8 mA IOL = 16 mA VI = 5.5 V or GND VO = VCC or GND VI = VCC or GND, IO = 0 VI or VO = 0 V to 5.5 V VI = VCC or GND Unit V Test Conditions
Note: For conditions shown as Min or Max, use the appropriate values under recommended operating conditions.
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HD74LV126A
Switching Characteristics
• VCC = 2.5 ± 0.2 V
Ta = 25°C Item Propagation delay time Symbol tPLH tPHL Min — Typ 7.1 Max 13.0 Ta = –40 to 85°C Min 1.0 Max 15.5 Unit ns Test Conditions CL = 15 pF FROM (Input) TO (Output) Y
A
— Enable time tZH tZL —
9.2 7.4
16.5 13.0
1.0 1.0
18.5 15.5 ns
CL = 50 pF CL = 15 pF OE Y
— Disable time tHZ tLZ —
9.5 5.7
16.5 14.7
1.0 1.0
18.5 17.0 ns
CL = 50 pF CL = 15 pF OE Y
—
8.1
18.2
1.0
20.5
CL = 50 pF
• VCC = 3.3 ± 0.3 V
Ta = 25°C Item Propagation delay time Symbol tPLH tPHL Min — Typ 5.0 Max 8.0 Ta = –40 to 85°C Min 1.0 Max 9.5 Unit ns Test Conditions CL = 15 pF FROM (Input) TO (Output) Y
A
— Enable time tZH tZL —
6.4 5.1
11.5 8.0
1.0 1.0
13.0 9.5 ns
CL = 50 pF CL = 15 pF OE Y
— Disable time tHZ tLZ —
6.6 4.4
11.5 9.7
1.0 1.0
13.0 11.5 ns
CL = 50 pF CL = 15 pF OE Y
—
6.1
13.2
1.0
15.0
CL = 50 pF
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HD74LV126A
Switching Characteristics (cont)
• VCC = 5.0 ± 0.5 V
Ta = 25°C Item Propagation delay time Symbol tPLH tPHL Min — Typ 3.5 Max 5.5 Ta = –40 to 85°C Min 1.0 Max .