TC74VHC257F/FT/FK
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74VHC257F,TC74VHC257FT,TC74VHC257FK
Quad 2-Channel Multiplexer (3-state)
TC74VHC257F
The TC74VHC257 is an advanced high speed CMOS
MULTIPLEXER fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low power
dissipation.
It is composed of four independent 2-channel multiplexers with
common SELECT and OUTPUT ENABLE ( OE ).
If OE is set low, the outputs are held in a high-impedance
state. When SELECT is set low, “A” data inputs are enabled.
Conversely, when SELECT is high, “B” data inputs are
enabled.
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.
Features
•
TC74VHC257FT
TC74VHC257FK
High speed: tpd = 3.6 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 74ALS257
Weight
SOP16-P-300-1.27A
TSSOP16-P-0044-0.65A
VSSOP16-P-0030-0.50
1
: 0.18 g (typ.)
: 0.06 g (typ.)
: 0.02 g (typ.)
2012-02-29
TC74VHC257F/FT/FK
Pin Assignment
IEC Logic Symbol
OE
SELECT
1
16
VCC
1A
2
15
OE
1B
3
14
4A
1Y
4
13
4B
2A
5
12
4Y
2B
6
11
3A
2Y
7
10
3B
GND
8
9
3Y
(15)
SELECT
(1)
1A
1B
2A
2B
3A
3B
4A
4B
(2)
(3)
(5)
(6)
(11)
(10)
(14)
(13)
EN
G1
1
MUX
(4)
1Y
1
(7)
2Y
(9)
3Y
(12)
4Y
(top view)
Truth Table
Inputs
Output
OE
SELECT
A
B
H
X
X
X
Z
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
X: Don’t care
Z: High impedance
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TC74VHC257F/FT/FK
System Diagram
SELECT
1A
1B
2A
1
2
4 1Y
3
5
7
2B
3A
6
11
9
3B
4A
10
OE
3Y
14
12
4B
2Y
13
4Y
15
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).
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TC74VHC257F/FT/FK
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
−40 to 85
°C
Output voltage
Operating temperature
Topr
Input rise and fall time
0 to 100 (VCC = 3.3 ± 0.3 V)
dt/dv
ns/V
0 to 20 (VCC = 5 ± 0.5 V)
Note 1: The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
Electrical Characteristics
DC Characteristics
Characteristics
Test Condition
Symbol
VCC (V)
High-level input
voltage
VIH
―
Low-level input
voltage
VIL
―
High-level output
voltage
Low-level output
voltage
VOH
VOL
VIN
= VIH or
VIL
VIN
= VIH or
VIL
Ta =
−40 to 85°C
Ta = 25°C
2.0
Min
1.50
VCC ×
3.0 to 5.5
0.7
Typ.
Max
―
―
―
―
0.50
Min
1.50
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
IOH = −50 μA
IOL = 50 μA
V
0.50
2.0
―
Unit
Max
V
V
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
VIN = VIH or VIL
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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TC74VHC257F/FT/FK
AC Characteristics (input: tr = tf = 3 ns)
Characteristics
Test Condition
Symbol
VCC (V)
Propagation delay
time
tpLH
(A, B-Y)
tpHL
Propagation delay
time
tpLH
(SELECT-Y)
tpHL
tpZL
3-state output enable
time
tpZH
tpLZ
3-state output disable
time
tpHZ
CL (pF)
Min
Typ.
Max
Min
Max
15
―
5.8
9.3
1.0
11.0
50
―
8.3
12.8
1.0
14.5
15
―
3.6
5.9
1.0
7.0
50
―
5.1
7.9
1.0
9.0
15
―
7.0
11.0
1.0
13.0
50
―
9.5
14.5
1.0
16.5
15
―
4.0
6.8
1.0
8.0
50
―
5.5
8.8
1.0
10.0
15
―
6.7
10.5
1.0
12.5
50
―
9.2
14.0
1.0
16.0
15
―
3.6
6.8
1.0
8.0
50
―
5.1
8.8
1.0
10.0
3.3 ± 0.3
50
―
8.6
12.0
1.0
13.5
5.0 ± 0.5
50
―
5.7
7.9
1.0
9.0
3.3 ± 0.3
―
5.0 ± 0.5
3.3 ± 0.3
―
5.0 ± 0.5
3.3 ± 0.3
RL = 1 kΩ
5.0 ± 0.5
RL = 1 kΩ
Ta = −40 to
85°C
Ta = 25°C
Unit
ns
ns
ns
ns
Input capacitance
CIN
―
―
4
10
―
10
pF
Onput capacitance
COUT
―
―
6
―
―
―
pF
Power dissipation
capacitance
CPD
―
23
―
―
―
pF
(Note)
Note: 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 bit)
Noise Characteristics (input: tr = tf = 3 ns)
Characteristics
Test Condition
Symbol
Ta = 25°C
VCC (V)
Typ.
Max
Unit
Quiet output maximum dynamic VOL
VOLP
CL = 50 pF
5.0
0.3
0.8
V
Quiet output minimum dynamic VOL
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
Input Equivalent Circuit
INPUT
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TC74VHC257F/FT/FK
Package Dimensions
Weight: 0.18 g (typ.)
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TC74VHC257F/FT/FK
Package Dimensions
Weight: 0.06 g (typ.)
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TC74VHC257F/FT/FK
Package Dimensions
Weight: 0.02 g (typ.)
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TC74VHC257F/FT/FK
RESTRICTIONS ON PRODUCT USE
• Toshiba Corporation, and its subsidiaries and affiliates (collectively "TOSHIBA"), reserve the right to make changes to the information
in this document, and related hardware, software and systems (collectively "Product") without notice.
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TOSHIBA's written permission, reproduction is permissible only if reproduction is without alteration/omission.
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responsible for complying with safety standards and for providing adequate designs and safeguards for their hardware, software and
systems which minimize risk and avoid situations in which a malfunction or failure of Product could cause loss of human life, bodily
injury or damage to property, including data loss or corruption. Before customers use the Product, create designs including the
Product, or incorporate the Product into their own applications, customers must also refer to and comply with (a) the latest versions of
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
design or applications; (b) evaluating and determining the applicability of any information contained in this document, or in charts,
diagrams, programs, algorithms, sample application circuits, or any other referenced documents; and (c) validating all operating
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• PRODUCT IS NEITHER INTENDED NOR WARRANTED FOR USE IN EQUIPMENTS OR SYSTEMS THAT REQUIRE
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limitation, equipment used in nuclear facilities, equipment used in the aerospace industry, medical equipment, equipment used for
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