M74HC240
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (INVERTED)
HIGH SPEED:
t = 10ns (TYP.) at V = 6V
PD CC
LOW POWER DISSIPATION:
I = 4A(MAX.) at T =25C
CC A
HIGH NOISE IMMUNITY:
V = V = 28 % V (MIN.)
NIH NIL CC
DIP SOP TSSOP
SYMMETRICAL OUTPUT IMPEDANCE:
|I | = I = 6mA (MIN)
OH OL
BALANCED PROPAGATION DELAYS:
ORDER CODES
t t
PLH PHL
PACKAGE TUBE T & R
WIDE OPERATING VOLTAGE RANGE:
V (OPR) = 2V to 6V
DIP M74HC240B1R
CC
PIN AND FUNCTION COMPATIBLE WITH SOP M74HC240M1R M74HC240RM13TR
74 SERIES 240
TSSOP M74HC240TTR
DESCRIPTION
This device is designed to be used with 3 state
The M74HC240 is an advanced high-speed
memory address drivers, etc.
CMOS OCTAL BUS BUFFER (3-STATE)
All inputs are equipped with protection circuits
2
fabricated with silicon gate C MOS technology.
against static discharge and transient excess
G control input governs four BUS BUFFERs. voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
July 2001 1/10M74HC240
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
11G Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1 to 2Y4 Data Outputs
11, 13, 15, 2A1 to 2A4 Data Inputs
17
18, 16, 14, 1Y1 to 1Y4 Data Outputs
12
19 2G Output Enable Input
10 GND Ground (0V)
20 V Positive Supply Voltage
CC
TRUTH TABLE
INPUTS OUTPUT
G An Yn
LL H
LH L
HX Z
X : Dont Care
Z : High Impedance
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V Supply Voltage
-0.5 to +7 V
CC
V DC Input Voltage -0.5 to V + 0.5
V
I CC
V DC Output Voltage -0.5 to V + 0.5
V
O CC
I DC Input Diode Current
20 mA
IK
I DC Output Diode Current
20 mA
OK
I DC Output Current
35 mA
O
I or I DC V or Ground Current 70 mA
CC GND CC
P Power Dissipation
500(*) mW
D
T Storage Temperature -65 to +150 C
stg
T Lead Temperature (10 sec) 300 C
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65 C; derate to 300mW by 10mW/C from 65C to 85C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V Supply Voltage
2 to 6 V
CC
V Input Voltage 0 to V
V
I CC
V Output Voltage 0 to V
V
O CC
T Operating Temperature
-55 to 125 C
op
Input Rise and Fall Time V = 2.0V 0 to 1000 ns
CC
t , t V = 4.5V 0 to 500 ns
r f CC
V = 6.0V 0 to 400 ns
CC
2/10