74ABT2240 Octal Buffer/Line Driver with 25Ω Series Resistors in the Outputs
March 1994
Revised November 1999
74ABT2240
Octal Buffer/Line Driver with
25Ω Series Resistors in the Outputs
General Description
The ABT2240 is an inverting octal buffer and line driver
designed to drive the capacitive inputs of MOS memory
drivers, address drivers, clock drivers, and bus-oriented
transmitters/receivers.
The 25Ω series resistors in the outputs reduce ringing and
eliminate the need for external resistors.
Features
s
Guaranteed latchup protection
s
High impedance glitch-free bus loading during entire
power up and power down cycle
s
Nondestructive hot insertion capability
Ordering Code:
Order Number
74ABT2240CSC
74ABT2240CSJ
74ABT2240CMSA
74ABT2240CMTC
Package Number
M20B
M20D
MSA20
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending letter suffix “X” to the ordering code.
Connection Diagram
Pin Descriptions
Pin Names
OE
1
, OE
2
D
0
–D
7
O
0
–O
7
Descriptions
Output Enable Input (Active LOW)
Data Inputs
Outputs
Schematic of Each Output
Truth Table
OE
1
H
L
L
I
0–3
X
H
L
O
0–3
Z
L
H
OE
2
H
L
L
I
4–7
X
H
L
O
4–7
Z
L
H
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
© 1999 Fairchild Semiconductor Corporation
DS011665
www.fairchildsemi.com
74ABT2240
Absolute Maximum Ratings
(Note 1)
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
V
CC
Pin Potential to Ground Pin
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Any Output
in the Disabled or
Power-off State
in the HIGH State
Current Applied to Output
in LOW State (Max)
DC Latchup Source Current
(Across Comm Operating Range)
Over Voltage Latchup (I/O)
−300
mA
10V
twice the rated I
OL
(mA)
−0.5V
to 5.5V
−0.5V
to V
CC
−65°C
to
+150°C
−55°C
to
+125°C
−55°C
to
+150°C
−0.5V
to
+7.0V
−0.5V
to
+7.0V
−30
mA to
+5.0
mA
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
Minimum Input Edge Rate (∆V/∆t)
Data Input
Enable Input
50 mV/ns
20 mV/ns
−40°C
to
+85°C
+4.5V
to
+5.5V
Note 1:
Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2:
Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
CD
V
OH
V
OL
I
IH
I
BVI
I
IL
V
ID
I
OZH
I
OZL
I
OS
I
CEX
I
ZZ
I
CCH
I
CCL
I
CCZ
I
CCT
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
Output LOW Voltage
Input HIGH Current
Input HIGH Current Breakdown Test
Input LOW Current
Input Leakage Test
2.5
2.0
0.8
1
1
7
−1
−1
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
V
V
V
µA
µA
µA
V
µA
µA
mA
µA
µA
µA
mA
µA
mA
mA
µA
mA/
0.1
MHz
Max
Min
Min
Min
Min
Max
Max
Max
0.0
V
CC
Conditions
Recognized HIGH Signal
Recognized LOW Signal
I
IN
= −18
mA
I
OH
= −3
mA
I
OH
= −32
mA
I
OL
=
15 mA
V
IN
=
2.7V (Note 3)
V
IN
=
V
CC
V
IN
=
7.0V
V
IN
=
0.5V (Note 3)
V
IN
=
0.0V
I
ID
=
1.9
µA
All Other Pins Grounded
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Output HIGH Leakage Current
Bus Drainage Test
Power Supply Current
Power Supply Current
Power Supply Current
10
−10
−275
50
100
50
30
50
Outputs Enabled
Outputs 3-STATE
Outputs 3-STATE
I
CCD
Dynamic I
CC
(Note 3)
No Load
1.5
1.5
50
0
−
5.5V V
OUT
=
2.7V; OEn
=
2.0V
0
−
5.5V V
OUT
=
0.5V; OEn
=
2.0V
Max
Max
0.0
Max
Max
Max
V
OUT
=
0.0V
V
OUT
=
V
CC
V
OUT
=
5.5V; All Others GND
All Outputs HIGH
All Outputs LOW
OEn
=
V
CC
All Others at V
CC
or GND
Additional
I
CC
/Input
V
I
=
V
CC
−
2.1V
Enable Input V
I
=
V
CC
−
2.1V
Data Input V
I
=
V
CC
−
2.1V
All Others at V
CC
or GND
Max
Outputs OPEN
OEn
=
GND (Note 4)
One Bit Toggling, 50% Duty Cycle
Note 3:
Guaranteed, but not tested.
Note 4:
For 8 bits toggling, I
CCD
<
0.8 mA/MHz.
www.fairchildsemi.com
2
74ABT2240
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation
Delay Data to Outputs
Output Enable
Time
Output Disable
Time
1.0
1.5
1.5
2.7
1.9
1.9
V
CC
= +5V
C
L
=
50 pF
Typ
Max
4.9
5.3
6.6
6.9
6.4
6.4
1.0
1.5
1.5
2.7
1.9
1.9
T
A
= −40°C
to
+85°C
V
CC
=
4.5V–5.5V
C
L
=
50 pF
Min
Max
4.9
5.3
6.6
6.9
6.4
6.4
ns
ns
ns
Units
Capacitance
Symbol
C
IN
C
OUT
(Note 5)
Parameter
Input Capacitance
Output Capacitance
Typ
5.0
9.0
Units
pF
pF
V
CC
=
0V
V
CC
=
5.0V
Conditions
T
A
=
25°C
Note 5:
C
OUT
is measured at frequency f
=
1 MHz, per MIL-STD-883, Method 3012.
3
www.fairchildsemi.com
74ABT2240
AC Loading
*Includes jig and probe capacitance
FIGURE 1. Standard AC Test Load
Amplitude
3.0V
Rep. Rate
1 MHz
t
W
500 ns
FIGURE 2. Propagation Delay,
Pulse Width Waveforms
t
r
2.5 ns
t
f
2.5 ns
FIGURE 3. Test Input Signal Requirements
AC Waveforms
FIGURE 4. Propagation Delay Waveforms for
Inverting and Non-Inverting Functions
FIGURE 6. Test Input Signal Levels
FIGURE 5. 3-STATE Output HIGH
and LOW Enable and Disable Times
FIGURE 7. Setup Time, Hold Time
and Recovery Time Waveforms
www.fairchildsemi.com
4
74ABT2240
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
Package Number M20B
5
www.fairchildsemi.com
京公网安备 11010802033920号
EEWORLD
