TC74VHC125,126F/FT/FK
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74VHC125F,TC74VHC125FT,TC74VHC125FK
TC74VHC126F,TC74VHC126FT,TC74VHC126FK
TC74VHC125F/FT/FK
TC74VHC126F/FT/FK
Quad Bus Buffer
Quad Bus Buffer
TC74VHC125F, TC74VHC126F
The TC74VHC125/126 are high speed CMOS QUAD BUS
BUFFERs fabricated with silicon gate C2MOS technology.
They achieve the high speed operation similar to equivalent
Bipolar Shottky TTL while maintaining the CMOS low power
dissipation.
The TC74VHC125 requires the 3-state control input G to be
set high to place the output into the high impedance state,
whereas the TC74VHC126 requires the control input G to be set
low to place the output into high impedance.
An input protection circuit ensures that 0 to 5.5 V can be
applied to the input pins without regard to the supply voltage.
This device can be used to interface 5 V to 3 V systems and two
supply systems such as battery back up.
This circuit prevents device destruction due to mismatched
supply and input voltages.
TC74VHC125FT, TC74VHC126FT
Features
TC74VHC125FK, TC74VHC126FK
•
High speed: tpd = 3.8 ns (typ.) at VCC = 5 V
•
Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
•
High noise immunity: VNIH = VNIL = 28% VCC (min)
•
•
Power down protection is provided on all inputs.
Balanced propagation delays: tpLH ∼
− tpHL
•
Wide operating voltage range: VCC (opr) = 2 to 5.5 V
•
Low noise: VOLP = 0.8 V (max)
•
Pin and function compatible with 74ALS125/126
Weight
SOP14-P-300-1.27A
: 0.18 g (typ.)
TSSOP14-P-0044-0.65A : 0.06 g (typ.)
VSSOP14-P-0030-0.50
: 0.02 g (typ.)
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TC74VHC125,126F/FT/FK
Pin Assignment
TC74VHC125
TC74VHC126
1G
1
14
VCC
1G
1
14
VCC
1A
2
13
4G
1A
2
13
4G
1Y
3
12
4A
1Y
3
12
4A
2G
4
11
4Y
2G
4
11
4Y
2A
5
10
3G
2A
5
10
3G
2Y
6
9
3A
2Y
6
9
3A
GND
7
8
3Y
GND
7
8
3Y
(top view)
(top view)
IEC Logic Symbol
TC74VHC125
1G
1A
2G
2A
3G
3A
4G
4A
(1)
(2)
EN
TC74VHC126
(3)
(4)
(6)
(5)
(10)
(8)
(9)
(13)
(11)
(12)
1Y
2Y
3Y
4Y
1G
(1)
1A
2G
(4)
(2)
(3)
(6)
(5)
2A
3G
(10)
3A
4G
(13)
4A
EN
(8)
(9)
(11)
(12)
1Y
2Y
3Y
4Y
Truth Table
TC74VHC125
Inputs
TC74VHC126
Output
Inputs
Output
G
A
Y
G
A
Y
H
X
Z
L
X
Z
L
L
L
H
L
L
L
H
H
H
H
H
X: Don’t care
X: Don’t care
Z: High impedance
Z: High impedance
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TC74VHC125,126F/FT/FK
Absolute Maximum Ratings (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage range
VCC
−0.5 to 7.0
V
DC input voltage
VIN
−0.5 to 7.0
V
VOUT
−0.5 to VCC + 0.5
V
Input diode current
IIK
−20
mA
Output diode current
IOK
±20
mA
DC output current
IOUT
±25
mA
DC VCC/ground current
ICC
±50
mA
Power dissipation
PD
180
mW
Storage temperature
Tstg
−65 to 150
°C
DC output voltage
Note:
Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or
even destruction.
Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
significant change in temperature, etc.) may cause this product to decrease in the reliability significantly
even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute
maximum ratings and the operating ranges.
Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/“Derating Concept and Methods”) and individual reliability data (i.e. reliability test
report and estimated failure rate, etc).
Operating Ranges (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage
VCC
2.0 to 5.5
V
Input voltage
VIN
0 to 5.5
V
VOUT
0 to VCC
V
Operating temperature
Topr
−40 to 85
°C
Input rise and fall time
dt/dv
Output voltage
Note:
0 to 100 (VCC = 3.3 ± 0.3 V)
0 to 20 (VCC = 5 ± 0.5 V)
ns/V
The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
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TC74VHC125,126F/FT/FK
Electrical Characteristics
DC Characteristics
Characteristics
Test Condition
Symbol
Max
―
―
VCC ×
0.7
―
―
―
―
3.0 to
5.5
―
―
VCC ×
0.3
―
VCC ×
0.3
2.0
1.9
2.0
―
1.9
―
3.0
2.9
3.0
―
2.9
―
4.5
4.4
4.5
―
4.4
―
IOH = −4 mA
3.0
2.58
―
―
2.48
―
IOH = −8 mA
4.5
3.94
―
―
3.80
―
2.0
―
0.0
0.1
―
0.1
3.0
―
0.0
0.1
―
0.1
4.5
―
0.0
0.1
―
0.1
IOL = 4 mA
3.0
―
―
0.36
―
0.44
IOL = 8 mA
4.5
―
―
0.36
―
0.44
5.5
―
―
±0.25
―
±2.50
μA
VIH
―
Low-level input
voltage
VIL
―
Min
2.0
1.50
3.0 to
5.5
2.0
IOH = −50 μA
VOH
VIN
= VIH or VIL
IOL = 50 μA
Low-level output
voltage
VCC (V)
VOL
VIN
= VIH or VIL
VIN = VIH or VIL
0.50
Min
Unit
Typ.
High-level input
voltage
High-level output
voltage
Ta =
−40 to 85°C
Ta = 25°C
1.50
VCC ×
0.7
―
Max
―
―
V
0.50
V
V
V
3-state output
off-state current
IOZ
Input leakage
current
IIN
VIN = 5.5 V or GND
0 to 5.5
―
―
±0.1
―
±1.0
μA
Quiescent supply
current
ICC
VIN = VCC or GND
5.5
―
―
4.0
―
40.0
μA
VOUT = VCC or GND
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TC74VHC125,126F/FT/FK
AC Characteristics (input: tr = tf = 3 ns)
Characteristics
Test Condition
Symbol
VCC (V)
Propagation delay
time
Output enable time
Output disable time
Output to output skew
Input capacitance
tpZH
tpLZ
tpHZ
Min
Typ.
Max
Min
Max
15
―
5.6
8.0
1.0
9.5
50
―
8.1
11.5
1.0
13.0
15
―
3.8
5.5
1.0
6.5
50
―
5.3
7.5
1.0
8.5
15
―
5.4
8.0
1.0
9.5
50
―
7.9
11.5
1.0
13.0
15
―
3.6
5.1
1.0
6.0
50
―
5.1
7.1
1.0
8.0
3.3 ± 0.3
50
―
9.5
13.2
1.0
15.0
5.0 ± 0.5
50
―
6.1
8.8
1.0
10.0
3.3 ± 0.3
50
―
―
1.5
―
1.5
5.0 ± 0.5
50
―
―
1.0
―
1.0
―
tpHL
tpZL
CL (pF)
3.3 ± 0.3
tpLH
5.0 ± 0.5
3.3 ± 0.3
RL = 1 kΩ
5.0 ± 0.5
RL = 1 kΩ
tosLH
(Note 1)
tosHL
Ta =
−40 to 85°C
Ta = 25°C
Unit
ns
ns
ns
ns
CIN
―
―
4
10
―
10
pF
Output capacitance
COUT
―
―
6
―
―
―
pF
Power dissipation
capacitance (Note 2)
CPD
TC74VHC125
―
14
―
―
―
TC74VHC126
―
15
―
―
―
pF
Note 1: Parameter guaranteed by design.
tosLH = |tpLHm − tpLHn|, tosHL = |tpHLm − tpHLn|
Note 2: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
ICC (opr) = CPD·VCC·fIN + ICC/4 (per gate)
Noise Characteristics (input: tr = tf = 3 ns)
Characteristics
Quiet output maximum dynamic
Test Condition
Symbol
Ta = 25°C
VCC (V)
Typ.
Limit
Unit
VOLP
CL = 50 pF
5.0
0.3
0.8
V
VOLV
CL = 50 pF
5.0
−0.3
−0.8
V
Minimum high level dynamic input
voltage
VIHD
CL = 50 pF
5.0
―
3.5
V
Maximum low level dynamic input
voltage
VILD
CL = 50 pF
5.0
―
1.5
V
VOL
Quiet output minimum dynamic
VOL
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TC74VHC125,126F/FT/FK
Input Equivalent Circuit
INPUT
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TC74VHC125,126F/FT/FK
Package Dimensions
Weight: 0.18 g (typ.)
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TC74VHC125,126F/FT/FK
Package Dimensions
Weight: 0.06 g (typ.)
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TC74VHC125,126F/FT/FK
Package Dimensions
Weight: 0.02 g (typ.)
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TC74VHC125,126F/FT/FK
RESTRICTIONS ON PRODUCT USE
• Toshiba Corporation, and its subsidiaries and affiliates (collectively "TOSHIBA"), reserve the right to make changes to the information
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responsible for complying with safety standards and for providing adequate designs and safeguards for their hardware, software and
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all relevant TOSHIBA information, including without limitation, this document, the specifications, the data sheets and application notes
for Product and the precautions and conditions set forth in the "TOSHIBA Semiconductor Reliability Handbook" and (b) the
instructions for the application with which the Product will be used with or for. Customers are solely responsible for all aspects of their
own product design or applications, including but not limited to (a) determining the appropriateness of the use of this Product in such
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