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MC74VHCT240A Datasheet, PDF (1/6 Pages) ON Semiconductor – Octal Bus Buffer/Line Driver | |||
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Octal Bus Buffer/Line Driver
Inverting with 3-State Outputs
The MC74VHCT240A 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 MC74VHCT240A is an inverting 3âstate buffer, and has two
activeâlow output enables. This device is designed to be used with 3âstate
memory address drivers, etc.
The VHCT inputs are compatible with TTL levels. This device can be used
as a level converter for interfacing 3.3V to 5.0V, because it has full 5V CMOS
level output swings.
The VHCT240A input and output (when disabled) structures provide
protection when voltages between 0V and 5.5V are applied, regardless of
the supply voltage. These input and output structures help prevent device
destruction caused by supply voltage â input/output voltage mismatch,
battery backup, hot insertion, etc.
⢠High Speed: tPD = 5.6ns (Typ) at VCC = 5V
⢠Low Power Dissipation: ICC = 4µA (Max) at TA = 25°C
⢠TTLâCompatible Inputs: VIL = 0.8V; VIH = 2.0V
⢠Power Down Protection Provided on Inputs and Outputs
⢠Balanced Propagation Delays
⢠Designed for 4.5V to 5.5V Operating Range
⢠Low Noise: VOLP = 1.1V (Max)
⢠Pin and Function Compatible with Other Standard Logic Families
⢠Latchup Performance Exceeds 300mA
⢠ESD Performance: HBM > 2000V; Machine Model > 200V
⢠Chip Complexity: 110 FETs or 27.5 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
INVERTING
9 YB1 OUTPUTS
7 YB2
5 YB3
3 YB4
OUTPUT OEA 1
ENABLES OEB 19
MC74VHCT240A
DW SUFFIX
20âLEAD SOIC PACKAGE
CASE 751Dâ04
DT SUFFIX
20âLEAD TSSOP PACKAGE
CASE 948Eâ02
M SUFFIX
20âLEAD SOIC EIAJ PACKAGE
CASE 967â01
ORDERING INFORMATION
MC74VHCTXXXADW SOIC
MC74VHCTXXXADT TSSOP
MC74VHCTXXXAM 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
OUTPUTS
YA, YB
H
L
Z
6/97
© Motorola, Inc. 1997
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