Fairchild 74F125 service manual
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74F125
Quad Buffer (3-STATE)
Features
■ High impedance base inputs for reduced loading
Ordering Code:
Order Number Package Number Package Description
74F125SC M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
74F125SJ M14D 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F125PC N14A 14-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.
74F125 Quad Buffer (3-STATE)
April 1988
Revised July 1999
Logic Symbol
IEEE/IEC
Unit Loading/Fan Out
Pin Names Description
An, B
n
O
n
Function Table
H = HIGH Voltage Level
L = LOW Voltage Level
Z = High Impedance
X = Immaterial
Connection Diagram
O
Input I
Output I
IH/IIL
OH/IOL
U.L.
HIGH/LOW
Inputs 1.0/0.033 20 µA/−20 µA
Outputs 600/106.6 (80) −12 mA/64 mA (48 mA)
Inputs Output
A
n
LLL
LHH
HXZ
B
n
© 1999 Fairchild Semiconductor Corporation DS009475 www.fairchildsemi.com
Absolute Maximum Ratings(Note 1) Recommended Operating
Storage Temperature −65°C to +150°C
74F125
Ambient Temperature under Bias −55°C to +125°C
Junction Temperature under Bias −55°C to +150°C
V
Pin Potential to Ground Pin −0.5V to +7.0V
CC
Input Voltage (Note 2) −0.5V to +7.0V
Input Current (Note 2) −30 mA to +5.0 mA
Voltage Applied to Output
in HIGH State (with V
CC
= 0V)
Standard Output −0.5V to V
3-STATE Output −0.5V to +5.5V
Current Applied to Output
in LOW State (Max) twice the rated I
OL
Conditions
Free Air Ambient Temperature 0°C to +70°C
Supply Voltage +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
CC
under these conditions is not implied.
Note 2: Either v oltage limit or current limit is sufficient to protect inputs.
(mA)
DC Electrical Characteristics
Symbol Parameter Min Typ Max Units
V
V
V
V
V
I
I
I
I
I
I
I
I
I
I
I
IH
IL
CD
OH
OL
IH
BVI
IL
OZH
OZL
OS
CEX
ZZ
CCH
CCL
CCZ
Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
Input LOW Voltage 0.8 V Recognized as a LOW Signal
Input Clamp Diode Voltage −1.2 V Min IIN = −18 mA
Output HIGH 10% V
Voltage 10% V
5% V
5% V
Output LOW 10% V
Voltage
2.4 IOH = −3 mA
CC
2.0
CC
2.7 IOH = −3 mA
CC
2.0 IOH = −15 mA
CC
CC
0.55 V Min IOL = 64 mA
Input HIGH Current 20 µAMaxVIN = 2.7V
Input HIGH Current
Breakdown Test
100 µA0.0VVIN = 7.0V
Input LOW Current −20.0 µAMaxVIN = 0.5V
Output Leakage Current 50 µAMaxV
Output Leakage Current −50 µAMaxV
Output Short-Circuit Current −100 −225 mA Max V
Output HIGH Leakage Current 250 µAMaxV
Buss Drainage Test 500 µA0.0VV
Power Supply Current 18.5 24.0 mA Max VO = HIGH
Power Supply Current 31.7 40.0 mA Max VO = LOW
Power Supply Current 27.6 35.0 mA Max VO = HIGH Z
AC Electrical Characteristics
TA = +25°CT
Symbol Parameter
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay 2.0 4.0 6.0 2.0 6.5
Output Enable Time 3.5 4.7 7.5 3.0 8.5
Output Disable Time 1.5 3.9 5.5 1.5 6.0
VCC = +5.0V VCC = +5.0V
CL = 50 pF CL = 50 pF
Min Typ Max Min Max
3.0 4.6 7.5 3.0 8.0
3.5 5.3 8.0 3.5 9.0
1.5 4.0 6.0 1.5 6.5
V
CC
VMin
IOH = −12 mA
= 0°C to +70°C
A
OUT
OUT
OUT
OUT
OUT
Conditions
= 2.7V
= 0.5V
= 0V
= V
CC
= 5.25V
Units
ns
ns
ns
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