Diodes 74AHCT125 User Manual
74AHCT125
QUADRUPLE 3-STATE BUFFERS OE LOW
Description
The 74AHCT125 provides provides four independent buffer gates
with 3-state outputs. Each buffer has a separate enable pin that if
driven with a high logic level places the corresponding output in the
high impedance state. The device is designed for operation with a
power supply range of 4.5V to 5.5V.
Pin Assignments
Features
• Wide Supply Voltage Range from 4.5V to 5.5V
• Inputs Are TTL Voltage Level Compatible
• Outputs Sink or Source 8mA at V
• CMOS Low Power Consumption
• Schmitt Trigger Action at All Inputs
• ESD Protection Exceeds JESD 22
NEW PRODUCT
200-V Machine Model (A115-A)
2000-V Human Body Model (A114-A)
Exceeds 1000-V Charged Device Model (C101C)
• Latch-Up Exceeds 250mA per JESD 78, Class II
• Range of Package Options SO-14 and TSSOP-14
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
74AHCT125
Document number: DS35355 Rev. 3 - 2
= 4.5V
CC
Applications
• General Purpose Logic
• Wide array of products such as:
PCs, Networking, Notebooks, Netbooks
Computer Peripherals, Hard Drives, CD/DVD ROM
TV, DVD, DVR, Set Top Box
Click here for ordering information, located at the end of datasheet
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74AHCT125
Pin Descriptions
Pin
Number
1 1OE Data Enable Input (active low)
2 1A Data Input
3 1Y Data Output
4 2OE Data Enable Input (active low)
5 2A Data Input
6 2Y Data Output
7 GND Ground
8 3Y Data Output
9 3A Data Input
10 3OE Data Enable Input (active low)
11 4Y Data Output
12 4A Data Input
13 4OE Data Enable Input (active low)
NEW PRODUCT
14
Pin Name Function
V
CC
upply Voltage
Logic Diagram
Function Table
Inputs Output
OE
L H H
L L L
H X Z
Absolute Maximum Ratings (Note 4) (@T
Symbol Description Rating Unit
ESD HBM Human Body Model ESD Protection 2 KV
ESD CDM Charged Device Model ESD Protection 1 KV
ESD MM Machine Model ESD Protection 200 V
VCC
VI
IIK Input Clamp Current VI < -0.5V
IOK Output Clamp Current VO < 0V
IOK Output Clamp Current VO > VCC
IO Continuous Output Current 0V < V
ICC Continuous Current Through VCC
I
GND
TJ
T
STG
P
TOT
Note: 4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should
be within recommend values.
74AHCT125
Document number: DS35355 Rev. 3 - 2
A Y
= +25°C, unless otherwise specified.)
A
Supply Voltage Range -0.5 to +7.0 V
Input Voltage Range -0.5 to +7.0 V
-20 mA
-20 mA
20 mA
< VCC
O
Continuous Current Through GND -50 mA
Operating Junction Temperature -40 to +150 °C
Storage Temperature -65 to +150 °C
Total Power Dissipation 500 mW
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+/- 25 mA
50 mA
January 2013
© Diodes Incorporated
Recommended Operating Conditions (Note 5) (@T
Symbol Parameter Min Max Unit
VCC
VI
VO
Supply Voltage 4.5 5.5 V
Input Voltage 0 5.5 V
Output Voltage 0
Δt/ΔV Input Transition Rise or Fall Rate 20 ns/V
TA
Note: 5. Unused inputs should be held at VCC or Ground.
Operating Free-Air Temperature -40 +125 °C
Electrical Characteristics (@T
= +25°C, unless otherwise specified.)
A
Symbol Parameter Test Conditions
NEW PRODUCT
VIH
VIL
VOH
VOL
IOZ
II
ICC
ΔICC
High-Level Input
Voltage
Low-Level Input
Voltage
High-Level
Output Voltage
Low-Level Output
Voltage
Z State
Leakage Current
Input Current
Supply Current
Additional Supply
Current
= -50μA
I
OH
IOH = -8mA
= 50μA
I
OL
IOL = 8mA
VO = 0 to 5.5V
VI = GND to 5.5V
VI = GND or VCC, IO = 0
One input at V
Other pins at V
4.5V to 5.5V 2.0 2.0 V
4.5V to 5.5V 0.8 0.8 V
-2.1V
CC
or GND
CC
Operating Characteristics
Parameter
Test
Conditions
Cpd
Ci
Power Dissipation
Capacitance per Gate
Input Capacitance
f = 1MHz 14.8 pF
= V
V
– or
i
CC
GND
Switching Characteristics
Symbol Parameter Test Conditions
tPD Propagation Delay AN to YN
Enable Time OE
tEN
Disable Time OE
t
DIS
to YN
N
to YN
N
Figure 1 C
Figure 1 CL = 50pF
Figure 1 C
Figure 1 CL = 50pF
Figure 1 C
Figure 1 CL = 50pF
= 15pF
L
= 15pF
L
= 15pF
L
74AHCT125
Document number: DS35355 Rev. 3 - 2
74AHCT125
= +25°C, unless otherwise specified.)
A
VCC
VCC
TA = -40°C to +85°C TA = -40°C to +125°C
Min Max Min Max
4.5V 4.4 4.4
4.5V 3.80 3.70
4.5V 0.1 0.1
4.5V 0.44 0.55
5.5V ±2.5 ±10 μA
3.6V ±1 ±2 μA
3.6V 20 40 μA
5.5V 1.35 5 mA
V
= 5.5V
CC
Typ
Unit
4.0 pF
= +25°C
T
A
-40°C to +85°C -40°C to +125°C
Min Typ. Max Min Max Min Max
0.5 3.0 5.5 0.5 6.5 0.5 7.0
0.5 4.3 7.5 0.5 8.5 0.5 9.5
0.5 6.7 10.7 0.5 11.0 0.5 11.5
0.5 9.8 10.9 0.5 12.1 0.5 12.5
0.5 4.8 6.8 0.5 8.0 0.5 8.5
0.5 6.5 8.9 0.5 10.0 0.5 11.5
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V
Unit
V
V
Unit
ns
ns
ns
January 2013
© Diodes Incorporated
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