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STMicroelectronics |
74AC240
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (INVERTED)
s HIGH SPEED: tPD = 4 ns (TYP.) at VCC = 5V
s LOW POWER DISSIPATION:
ICC = 8 µA (MAX.) at TA = 25 oC
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s 50Ω TRANSMISSION LINE DRIVING
BM
CAPABILITY
(Plastic Package)
(Micro Package)
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24 mA (MIN)
s BALANCED PROPAGATION DELAYS:
ORDER CODES :
74AC240B
74AC240M
tPLH ≅ tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 240
s IMPROVED LATCH-UP IMMUNITY
mantaining high speed operation similar to
equivalent Bipolar Schottky TTL.
G control output governs four BUS BUFFERs.
This device is designed to be used with 3 state
memory address drivers, etc.
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equipped with
discharge, giving
transient excess
technology. It is ideal for low power applications
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 1997
1/8
74AC240
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 4, 6, 8
9, 7, 5, 3
11, 13, 15, 17
18, 16, 14, 12
19
10
20
SYMBOL
1G
1A1 to 1A4
2Y1 to 2Y4
2A1 to 2A4
1Y1 to 1Y4
2G
GND
VCC
NAME AND FUNCTION
Output Enable Input
Data Inputs
Data Outputs
Data Inputs
Data Outputs
Output Enabel Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
X: ”H” or ”L”
Z: High impedance
G
L
L
H
I N PU T
An
L
H
X
OUT PUT
Yn
H
L
Z
ABSOLUTE MAXIMUM RATINGS
Sy mb o l
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7
V
VI DC Input Voltage
-0.5 to VCC + 0.5
V
VO DC Output Voltage
-0.5 to VCC + 0.5
V
IIK DC Input Diode Current
± 20 mA
IOK DC Output Diode Current
± 20 mA
IO DC Output Current
± 50 mA
ICC or IGND DC VCC or Ground Current
± 400
mA
Tstg Storage Temperature
-65 to +150
oC
TL Lead Temperature (10 sec)
300 oC
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
RECOMMENDED OPERATING CONDITIONS
Sy mb o l
Parameter
VCC Supply Voltage
VI Input Voltage
VO Output Voltage
Top Operating Temperature:
dt/dv Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5 V(note 1)
1) VIN from 30% to 70% of VCC
Value
2 to 6
0 to VCC
0 to VCC
-40 to +85
8
Un it
V
V
V
oC
ns/V
2/8
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