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Fairchild |
January 1991
Revised August 1999
74FR2240
Octal Buffer/Line Driver
with 25Ω Series Resistors in the Outputs
General Description
The 74FR2240 is an inverting octal buffer and line driver
designed to drive capacitive inputs of MOS memory
devices, address and clock lines or act as a low under-
shoot general purpose bus driver.
Features
s 3-STATE outputs drive bus lines or buffer memory
address registers
s Outputs sink 12 mA and source 15 mA
s 25Ω series resistors in outputs eliminate the need for
external resistors
s Designed to drive the capacitive inputs of MOS devices
Ordering Code:
Order Number Package Number
Package Description
74FR2240SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74FR2240PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Pin Descriptions
Pin Names
Description
OE1, OE2
I0–I7
O0–O7
Output Enable Input (Active-LOW)
Inputs
Outputs
Truth Tables
Inputs
OE1
L
In
L
LH
HX
Inputs
OE2
L
In
L
LH
HX
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Outputs
(Pins 12, 14, 16, 18)
H
L
Z
Outputs
(Pins 3, 5, 7, 9)
H
L
Z
© 1999 Fairchild Semiconductor Corporation DS010904
www.fairchildsemi.com
Absolute Maximum Ratings(Note 1)
Storage Temperature
−65°C to +150°C
Ambient Temperature under Bias
−55°C to +125°C
Junction Temperature under Bias
−55°C to +150°C
VCC Pin Potential to Ground Pin
Input Voltage (Note 2)
−0.5V to +7.0V
−0.5V to +7.0V
Input Current (Note 2)
−30 mA to +5.0 mA
Voltage Applied to Output
in HIGH State (with VCC = 0V)
Standard Output
3-STATE Output
−0.5V to VCC
−0.5V to +5.5V
Current Applied to Output
in LOW State (Max)
Twice the Rated IOL (mA)
ESD Last Passing Voltage (Min)
4000V
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to +70°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
Parameter
VIH Input HIGH Voltage
VIL Input LOW Voltage
VCD Input Clamp Diode Voltage
VOH Output HIGH Voltage
VOL Output LOW Voltage
IIH Input HIGH Current
IBVI Input HIGH Current
Breakdown Test
IIL Input LOW Current
VID Input Leakage Test
IOD Output Circuit Leakage Current
IOZH
IOZL
IOS
ICEX
IZZ
ICCH
ICCL
ICCZ
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
Min
Typ
Max
Units
VCC
Conditions
2.0 V Recognized HIGH Signal
0.8 V
Recognized LOW Signal
−1.2 V Min IIN = −18 mA
2.4 V Min IOH = −3 mA
2.0 V Min IOH = −15 mA
0.5 V Min IOL = 1 mA
0.75
V
Min IOL = 12 mA
5 µA Max VIN = 2.7V
7 µA Max VIN = 7.0V
4.75
−150 µA Max VIN = 0.5V
V 0.0 IID = 1.9 µA
All Other Pins Grounded
3.75
µA
0.0 VIOD = 150 mV
All Other Pins Grounded
20 µA Max VOUT = 2.7V
−20 µA Max VOUT = 0.5V
−100
−225 mA Max VOUT = 0.0V
50 µA Max VOUT = VCC
100 µA 0.0 VOUT = 5.25V
9 13 mA Max All Outputs HIGH
37 45 mA Max All Outputs LOW
30 38 mA Max Outputs 3-STATE
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