MC74VHC240
Octal Bus Buffer/Line Driver
Inverting with 3-State Outputs
The MC74VHC240 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 MC74VHC240 is an inverting 3−state buffer, and has two
active−low output enables. This device is designed to drive bus lines
or buffer memory address registers.
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: t
PD
= 3.6 ns (Typ) at V
CC
= 5 V
•
Low Power Dissipation: I
CC
= 4
μA
(Max) at T
A
= 25°C
•
High Noise Immunity: V
NIH
= V
NIL
= 28% V
CC
•
Power Down Protection Provided on Inputs
•
Balanced Propagation Delays
•
Designed for 2 V to 5.5 V Operating Range
•
Low Noise: V
OLP
= 0.9 V (Max)
•
Pin and Function Compatible with Other Standard Logic Families
•
Latchup Performance Exceeds 300 mA
•
ESD Performance: HBM > 2000 V; Machine Model > 200 V
•
Chip Complexity: 120 FETs or 30 Equivalent Gates
•
These Devices are Pb−Free and are RoHS Compliant
http://onsemi.com
MARKING
DIAGRAMS
20
1
SOIC−20
DW SUFFIX
CASE 751D
20
VHC240
AWLYYWWG
1
20
20
1
TSSOP−20
DT SUFFIX
CASE 948E
VHC240
A
WL, L
Y
WW, W
G or
G
VHC
240
ALYWG
G
1
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
OEA
A1
YB4
A2
YB3
A3
YB2
A4
YB1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
OEB
YA1
B4
YA2
B3
YA3
B2
YA4
B1
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping
†
1000 Units/Reel
MC74VHC240DWR2G SOIC−20
MC74VHC240DTR2G TSSOP−20 2500 Units/Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Figure 1. Pin Assignment
FUNCTION TABLE
INPUTS
OEA, OEB
L
L
H
A, B
L
H
X
OUTPUTS
YA, YB
H
L
Z
©
Semiconductor Components Industries, LLC, 2011
May, 2011
−
Rev. 5
1
Publication Order Number:
MC74VHC240/D
ONSEMI [ ON SEMICONDUCTOR ]
