SGS Thomson Microelectronics 74AC240 Datasheet

74AC240
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (INVERTED)
HIGH SPEED: t
LOWPOWERDISSIPATION:
=8µA (MAX.)at TA=25oC
I
CC
HIGH NOISE IMMUNITY:
V
NIH=VNIL
50TRANSMISSION LINE DRIVING
=4 ns (TYP.)atVCC=5V
PD
=28%VCC(MIN.)
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|I
|=IOL=24mA(MIN)
OH
BALANCE DPROPAGATIONDELAYS:
t
t
PLH
PHL
OPERATINGVOLTAGERAN GE:
V
(OPR) = 2V to 6V
CC
PIN AND FUNCTION COMPATIBLE WITH
74SERIES240
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The AC240 is an advanced CMOS OCTAL BUS BUFFER (3-STATE) fabricated with sub-micron silicon gate and double-layermetal wiring C
2
MOS
technology. It is ideal for low power applications
B
(Plastic Package)
(Micro Package)
M
ORDERCODES:
74AC240B 74AC240M
mantaining high speed operation similar to equivalentBipolarSchottky TTL. G controloutput governs four BUS BUFFERs.
This device is designed to be used with 3 state memoryaddress drivers,etc. All inputs and outputs are equipped with protectioncircuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
PINCONNECTION AND IEC LOGIC SYMBOLS
April 1997
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74AC240
INPUTAND OUTPUTEQUIVALENTCIRCUIT
TRUTH TABLE
INPUT OUTPUT
GAnYn
LLH LHL
HXZ
X:”H”or ”L” Z: High impedance
PIN DESCRIPTION
PI N No SYM B O L NAME A ND FUNC T I ON
1 1G Output Enable Input 2,4, 6,8 1A1to1A4 Data Inputs 9,7, 5,3 2Y1to2Y4 Data Outputs
11,13,15, 17 2A1to2A4 Data Inputs 18,16,14, 12 1Y1to1Y4 Data Outputs
19 2G Output Enabel Input 10 GND Ground (0V) 20 V
CC
Positive Supply Voltage
ABSOLUTE MAXIMUM RATINGS
Symb o l Parame t er Val u e Uni t
V
V
V
I
I
OK
I
orI
I
CC
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
Supply Voltage -0.5to+7 V
CC
DC Input Voltage -0.5toVCC+0.5 V
I
DC Output Voltage -0.5toVCC+0.5 V
O
DC Input Diode Current ± 20 mA
IK
DC Output Diode Current ± 20 mA DC Output Current ± 50 mA
O
DC VCCor Ground Current ± 400 mA
GND
Storage Temperature -65to+150
stg
Lead Temperature (10 sec) 300
L
o
C
o
C
RECOMMENDEDOPERATINGCONDITIONS
Symb o l Parame t er Value Un i t
V
V
V
T
dt/dv Input Rise and Fall Time V
1) VINfrom30%to 70%of V
Supply Voltage 2to6 V
CC
Input Voltage 0toV
I
Output Voltage 0toV
O
Operating Temperature: -40to+85
op
= 3.0, 4.5 or 5.5 V(note 1) 8 ns/V
CC
CC
CC CC
V V
o
C
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DC SPECIFICATIONS
74AC240
Symbol Parameter Test Condit ions Value Unit
V
CC
(V)
High Level Input Voltage 3.0 VO=0.1V or
V
IH
4.5 3.15 2.25 3.15
T
=25oC-40to85
A
Min. Typ. Ma x. Min . Max.
2.1 1.5 2.1
V
-0.1 V
CC
o
C
5.5 3.85 2.75 3.85
Low Level Input Voltage 3.0 VO=0.1 Vor
V
IL
4.5 2.25 1.35 1.35
V
-0.1 V
CC
1.5 0.9 0.9
5.5 2.75 1.65 1.65
High Level Output
V
OH
Voltage
Low Level Output
V
OL
Voltage
Input Leakage Current
I
I
3 State Output Leakage
I
OZ
Current Quiescent Supply
I
CC
3.0
4.5 I
5.5 I
3.0 I
V
I
V
IH
V
4.5 I
5.5 I
3.0
4.5 I
5.5 I
3.0 I
V
I
V
IH
V
4.5 I
5.5 I
5.5
5.5 VI=VIHor V
IO=-50µA 2.9 2.99 2.9
(*)
or
IL
=-50µA 4.4 4.49 4.4
O
=
=-50µA 5.4 5.49 5.4
O
=-12 mA 2.56 2.46
O
=-24 mA 3.86 3.76
O
=-24 mA 4.86 4.76
O
IO=50µA0.0020.1 0.1
(*)
=
or
IL
=50µA0.0010.1 0.1
O
=50µΑ 0.001 0.1 0.1
O
=12mA 0.36 0.44
O
=24mA 0.36 0.44
O
=24mA 0.36 0.44
O
VI=VCCorGND ±0.1 ±1 µA
IL
±0.5 ±5 µA
VO=VCCorGND
5.5 VI=VCCorGND 8 80 µA
Current Dynamic Output Current
I
OLD
(note 1, 2)
I
OHD
1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 . (*)All outputs loaded.
5.5 V
=1.65 Vmax 75 mA
OLD
V
=3.85Vmin -75 mA
OHD
V
V
V
V
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