Fairchild Semiconductor 74AC240SC, 74AC240PC, 74AC240MTCX, 74AC240MTC, 74AC240CW Datasheet
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© 1999 Fairchild Semiconductor Corporation DS009941 www.fairchildsemi.com
November 1988
Revised November 1999
74AC240 • 74ACT240 Octal Buffer/Line Driver with 3-STATE Outputs
74AC240 • 74ACT240
Octal Buffer/Line Driv e r wit h 3- S TATE Outputs
General Description
The AC/ACT240 is an octal buffe r and line dr iver de signed
to be employed as a memory addre ss driver, clock driver
and bus oriented transmitter or receiver which provides
improved PC board densi ty.
Features
■ ICC and IOZ reduced by 5 0%
■ Inverting 3-STATE outputs drive bus lines or buffer
memory address registers
■ Outputs source/sink 24 mA
■ ACT240 has TTL-compatible inputs
Ordering Code:
Device also available in Tape and Reel. Specify by appending su ffix le tter “X” to the ordering code.
Logic Symbol
IEEE/IEC
Connection Diagram
Pin Descriptions
Tru th Tables
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
FACT is a trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74AC240SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74AC240SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC240MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,4.4mm Wide
74AC240PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
74ACT240SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74ACT240SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT240MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,4.4mm Wide
74ACT240PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Pin Names Description
OE
1
, OE
2
3-STATE Output Enable Inputs
I
0–I7
Inputs
O
0–O7
Outputs
Inputs Outputs
OE
1
I
n
(Pins 12, 14, 16, 18)
LL H
LH L
HX Z
Inputs Outputs
OE
2
I
n
(Pins 3, 5, 7, 9)
LL H
LH L
HX Z
www.fairchildsemi.com 2
74AC240 • 74ACT240
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power
supply, temperature, and ou tput/inp ut loadi ng varia bles. Fairchild does no t
recommend operat ion of FACT circuits outside da t abook specifications.
DC Electrical Characteristics for AC
Note 2: All outputs loaded; thresholds on input assoc iat ed with output under tes t.
Note 3: Maximum test duratio n 2. 0 ms, one output loaded at a time.
Note 4: I
IN
and ICC @ 3.0V are guaranteed to be less than or equa l to th e respective limit @ 5.5V VCC.
Supply Voltage (VCC) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
= −0.5V −20 mA
V
I
= VCC + 0.5V +20 mA
DC Input Voltage (V
I
) −0.5V to VCC + 0.5V
DC Output Diode Current (I
OK
)
V
O
= −0.5V −20 mA
V
O
= VCC + 0.5V +20 mA
DC Output Voltage (V
O
) −0.5V to VCC + 0.5V
DC Output Source
or Sink Current (I
O
) ±50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
) ±50 mA
Storage Temperature (T
STG
) −65°C to +150°C
Junction Temperature (T
J
)
PDIP 140°C
Supply Voltage (V
CC
)
AC 2.0V to 6.0V
ACT 4.5V to 5.5V
Input Voltage (V
I
) 0V to V
CC
Output Voltage (VO) 0V to V
CC
Operating Temperature (TA) −40°C to +85°C
Minimum Input Edge Rate (∆V/∆t)
AC Devices
V
IN
from 30% to 70% of V
CC
VCC @ 3.3V, 4.5V, 5.5V 125 mV/ns
Minimum Input Edge Rate (∆V/∆t)
ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@ 4.5V, 5.5V 125 mV/ns
Symbol Parameter
V
CC
(V)
T
A
= +25°CTA = −40°C to +85°C
Units Conditions
Typ Guaranteed Limits
V
IH
Minimum HIGH Level 3.0 1.5 2.1 2.1 V
OUT
= 0.1V
Input Voltage 4.5 2.25 3.15 3.15 V or VCC − 0.1V
5.5 2.75 3.85 3.85
V
IL
Maximum LOW Level 3.0 1.5 0.9 0.9 V
OUT
= 0.1V
Input Voltage 4.5 2.25 1.35 1.35 V or VCC − 0.1V
5.5 2.75 1.65 1.65
V
OH
Minimum HIGH Level 3.0 2.99 2.9 2.9
Output Voltage 4.5 4.49 4.4 4.4 V I
OUT
= −50 µA
5.5 5.49 5.4 5.4
VIN = VIL or V
IH
3.0 2.56 2.46 IOH = −12 mA
4.5 3.86 3.76 V I
OH
= −24 mA
5.5 4.86 4.76 I
OH
= −24 mA (Note 2)
V
OL
Maximum LOW Level 3.0 0.002 0.1 0.1
Output Voltage 4.5 0 .001 0.1 0.1 V I
OUT
= 50 µA
5.5 0.001 0.1 0.1
VIN = VIL or V
IH
3.0 0.36 0.44 IOL = 12 mA
4.5 0.36 0.44 V IOL = 24 mA
5.5 0.36 0.44 IOL = 24 mA (Note 2)
IIN (Note 4) Maximum Input Leakage Current 5.5 ± 0.1 ± 1.0 µAVI = VCC, GND
I
OZ
Maximum 3-STATE VI (OE) = VIL, V
IH
Leakage Current 5.5 ±0.25 ±2.5 µAVI = VCC, GND
VO = VCC, GND
I
OLD
Minimum Dynamic 5.5 75 mA V
OLD
= 1.65V Max
I
OHD
Output Current (Note 3) 5.5 −75 mA V
OHD
= 3.85V Min
ICC (Note 4) Maximum Quiescent Supply Current 5.5 4.0 40.0 µAVIN = VCC or GND
3 www.fairchildsemi.com
74AC240 • 74ACT240
DC Electrical Characteristics for ACT
Note 5: All outputs loaded; thres holds on input associate d w it h output under test.
Note 6: Maximum test duration 2.0 ms, one output loaded at a time.
Symbol Parameter
V
CC
TA = +25°CT
A
= −40°C to +85°C
Units Conditions
(V) Typ Guaranteed Limits
V
IH
Minimum HIGH Level 4.5 1.5 2.0 2.0
V
V
OUT
= 0.1V
Input Voltage 5.5 1.5 2.0 2.0 or VCC − 0.1V
V
IL
Maximum LOW Level 4.5 1.5 0.8 0.8
V
V
OUT
= 0.1V
Input Voltage 5.5 1.5 0.8 0.8 or V
CC
− 0.1V
V
OH
Minimum HIGH Level 4.5 4.49 4.4 4.4
VI
OUT
= −50 µA
Output Voltage 5.5 5.49 5.4 5.4
VIN = VIL or V
IH
4.5 3.86 3.76 V IOH = −24 mA
5.5 4.86 4.76 I
OH
= −24 mA (Note 5)
V
OL
Maximum LOW Level 4.5 0.001 0.1 0.1
VI
OUT
= 50 µA
Output Voltage 5.5 0.001 0.1 0.1
VIN = VIL or V
IH
4.5 0.36 0.44 V IOL = 24 mA
5.5 0.36 0.44 IOL = 24 mA (Note 5)
I
IN
Maximum Input
5.5 ±0.1 ±1.0 µAVI = VCC, GND
Leakage Current
I
OZ
Maximum 3- STATE
5.5 ±0.25 ±2.5 µA
VI = VIL, V
IH
Leakage Current VO = VCC, GND
I
CCT
Maximum
5.5 0.6 1.5 mA VI = VCC − 2.1V
ICC/Input
I
OLD
Minimum Dynamic 5.5 75 mA V
OLD
= 1.65V Max
I
OHD
Output Current (Note 6) 5.5 −75 mA V
OHD
= 3.85V Min
I
CC
Maximum Quiescent
5.5 4.0 40.0 µA
VIN = V
CC
Supply Current or GND
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