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MC74VHC244 Datasheet PDF : 8 Pages
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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
• These Devices are Pb−Free and are RoHS Compliant
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 OEA 1
ENABLES OEB 19
Figure 1. Logic Diagram
http://onsemi.com
20
1
20
1
MARKING DIAGRAMS
20
SOIC−20
DW SUFFIX
CASE 751D
VHC244
AWLYYWWG
1
20
TSSOP−20
DT SUFFIX
CASE 948E
1
VHC
244
ALYWG
G
20
1
20
SOEIAJ−20
M SUFFIX
CASE 967
1
VHC244
AWLYWWG
VHC244 = Specific Device Code
A
= Assembly Location
WL, L
= Wafer Lot
Y
= Year
WW, W = Work Week
G or G
= Pb−Free Package
(Note: Microdot may be in either location)
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.
© Semiconductor Components Industries, LLC, 2011
1
May, 2011 − Rev. 8
Publication Order Number:
MC74VHC244/D
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