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PDF MC74VHC244 Data sheet ( Hoja de datos )
| Número de pieza | MC74VHC244 | |
| Descripción | Octal Bus Buffer | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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MC74VHC244
Octal Bus Buffer
The MC74VHC244 is an advanced high speed CMOS octal bus
buffer fabricated with silicon gate CMOS technology.
The MC74VHC244 is a noninverting 3--state buffer, and has two
active--low output enables. This device is designed to be used with
3--state memory address drivers, etc.
The internal circuit is composed of three stages, including a buffer
output which provides high noise immunity and stable output. The
inputs tolerate voltages up to 7 V, allowing the interface of 5 V systems
to 3 V systems.
• High Speed: tPD = 3.9 ns (Typ) at VCC = 5 V
• Low Power Dissipation: ICC = 4 mA (Max) at TA = 25°C
• High Noise Immunity: VNIH = VNIL = 28% VCC
• Power Down Protection Provided on Inputs
• Balanced Propagation Delays
• Designed for 2 V to 5.5 V Operating Range
• Low Noise: VOLP = 0.9 V (Max)
• Pin and Function Compatible with Other Standard Logic Families
• Latchup Performance Exceeds 300 mA
• ESD Performance: Human Body Model > 2000 V
Machine Model > 200 V
• Chip Complexity: 136 FETs
• Pb--Free Packages are Available*
www.DataSheet4U.com
A1 2
A2 4
A3 6
DATA
INPUTS
A4 8
B1 11
B2 13
B3 15
B4 17
18 YA1
16 YA2
14 YA3
12 YA4
NONINVERTING
9 YB1 OUTPUTS
7 YB2
5 YB3
3 YB4
OUTPUT
ENABLES
OEA
OEB
1
19
Figure 1. Logic Diagram
*For additional information on our Pb--Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
March, 2006 -- Rev. 7
1
http://onsemi.com
20
1
SOIC--20 WB
DW SUFFIX
CASE 751D
20
1
TSSOP--20
DT SUFFIX
CASE 948E
MARKING DIAGRAM
20
VHC244
AWLYYWWG
1
20
VHC
244
ALYW
1
20
1
SOIC EIAJ--20
M SUFFIX
CASE 967
20
74VHC244
AWLYWW
1
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN ASSIGNMENT
OEA 1
A1 2
YB4 3
A2 4
YB3 5
A3 6
YB2 7
A4 8
YB1 9
GND 10
20 VCC
19 OEB
18 YA1
17 B4
16 YA2
15 B3
14 YA3
13 B2
12 YA4
11 B1
ORDERING INFORMATION
See detailed ordering and shipping information in the
Ordering Information Table on page 2 of this data sheet.
Publication Order Number:
MC74VHC244/D
1 page  
MC74VHC244
SWITCHING WAVEFORMS
A or B
50%
tPLH
YA or YB
50% VCC
VCC
GND
tPHL
Figure 3. Switching Waveform
OEA or OEB
YA or YB
YA or YB
50%
tPZL
50% VCC
tPZH
50% VCC
tPLZ
tPHZ
VCC
GND
HIGH
IMPEDANCE
VOL +0.3V
VOH --0.3V
HIGH
IMPEDANCE
Figure 4. Switching Waveform
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
CL*
TEST CIRCUITS
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
1 kΩ
CL*
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
*Includes all probe and jig capacitance
Figure 5. Test Circuit
*Includes all probe and jig capacitance
Figure 6. Test Circuit
INPUT
Figure 7. Input Equivalent Circuit
http://onsemi.com
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MC74VHC244.PDF ] | |
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