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PDF HD74LV244 Data sheet ( Hoja de datos )
| Número de pieza | HD74LV244 | |
| Descripción | Octal Buffers / Drivers with 3-state Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74LV244A
Octal Buffers / Drivers with 3-state Outputs
ADE-205-246 (Z)
1st Edition
March 1999
Description
The HD74LV244A has eight line drivers with three-state outputs in a 20-pin package. Four non-inverters
are included in one circuit. Each circuit can be independently controlled by the enable signal 1OE or 2OE,
which enables outputs when receiving a low-level signal. Low-voltage operation is suitable for 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
L
L
H
Note:
H: High level
L: Low level
X: Immaterial
Z: High impedance
A
H
L
X
Output Y
H
L
Z
1 page  
Logic Diagram
1OE 1
1A1 2
4
1A2
1A3 6
8
1A4
18 1Y1
16
1Y2
14 1Y3
12
1Y4
2OE 19
2A1 11
13
2A2
2A3 15
17
2A4
HD74LV244A
9 2Y1
7
2Y2
5 2Y3
3
2Y4
5
5 Page 
• Waveform – 1
Input A
tr
10%
90%
50% VCC
tPLH
tf
90%
50% VCC
10 %
tPHL
Output Y
50% VCC
50% VCC
HD74LV244A
VCC
0V
VOH
VOL
• Waveform – 2
tf
Input OE
90%
50% VCC
10%
tZL
tr
10 %
90%
50% VCC
tLZ
Waveform – A
Waveform – B
50% VCC
tZH
50% VCC
VOL + 0.3 V
tHZ
VOH – 0.3 V
VCC
0V
VCC
VOL
VOH
0V
Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 3 ns, tf ≤ 3 ns
2. Waveform-A is for an output with internal conditions such that the output is low except when disabled
by the output control.
3. Waveform-B is for an output with internal conditions such that the output is high except when disabled
by the output control.
4. The output are measured one at a time with one transition per measurement..
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet HD74LV244.PDF ] | |
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