MC74VHC244 Datasheet, PDF (1/6 Pages) Motorola, Inc – Octal Bus Buffer

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Octal Bus Buffer
The MC74VHC244 is an advanced high speed CMOS octal bus buffer
fabricated with silicon gate CMOS technology. It achieves high speed
operation similar to equivalent Bipolar Schottky TTL while maintaining
CMOS low power dissipation.
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 7V, allowing the interface of 5V systems to 3V systems.
• High Speed: tPD = 3.9ns (Typ) at VCC = 5V
• Low Power Dissipation: ICC = 4µA (Max) at TA = 25°C
• High Noise Immunity: VNIH = VNIL = 28% VCC
• Power Down Protection Provided on Inputs
• Balanced Propagation Delays
• Designed for 2V to 5.5V Operating Range
• Low Noise: VOLP = 0.9V (Max)
• Pin and Function Compatible with Other Standard Logic Families
• Latchup Performance Exceeds 300mA
• ESD Performance: HBM > 2000V; Machine Model > 200V
• Chip Complexity: 136 FETs or 34 Equivalent Gates
A1 ²
A2 ⁴
A3 ⁶
DATA
INPUTS
A4 ⁸
B1 ¹¹
B2 ¹³
B3 ¹⁵
B4 ¹⁷
LOGIC DIAGRAM
18 _YA1
16 _YA2
14 _YA3
12 _YA4
NONINVERTING
9 _YB1 ^OUTPUTS
7 _YB2
5 _YB3
3 _YB4
OUTPUT OEA ¹
ENABLES _OEB ¹⁹
MC74VHC244
DW SUFFIX
20–LEAD SOIC PACKAGE
CASE 751D–04
DT SUFFIX
20–LEAD TSSOP PACKAGE
CASE 948E–02
M SUFFIX
20–LEAD SOIC EIAJ PACKAGE
CASE 967–01
ORDERING INFORMATION
MC74VHCXXXDW SOIC
MC74VHCXXXDT TSSOP
MC74VHCXXXM
SOIC EIAJ
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
FUNCTION TABLE
INPUTS
OEA, OEB
A, B
L
L
L
H
H
X
6/97
© Motorola, Inc. 1997
OUTPUTS
YA, YB
L
H
Z
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