TC74VHC245F/FK
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHC245F, TC74VHC245FK
Octal Bus Transceiver
The TC74VHC245 is an advanced high speed CMOS OCTAL BUS
TRANSCEIVER 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 intended for two-way asynchronous communication between data
busses. The direction of data transmission is determined by the level of the
DIR input.
The enable input ( G ) can be used to disable the device so that the busses
are effectively isolated.
All inputs are equipped with protection circuits against static discharge.
TC74VHC245F
TC74VHC245FK
Features (Note 1) (Note 2) (Note 3)
High speed: tpd = 4.0 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)
Balanced propagation delays: tpLH ∼
− tpHL
Weight
SOP20-P-300-1.27A
VSSOP20-P-0030-0.50
Wide operating voltage range: VCC (opr) = 2 V to 5.5 V
Low noise: VOLP = 1.0 V (max)
: 0.22 g (typ.)
: 0.03 g (typ.)
Pin and function compatible with 74ALS245
Note 1: Do not apply a signal to any bus terminal when it is in the output mode. Damage may result.
Note 2: All floating (high impedance) bus terminals must have their input levels fixed by means of pull up or pull down
resistors.
Note 3: A parasitic diode is formed between the bus and VCC terminals. Therefore bus terminal can not be used to
interface 5 V to 3 V systems directly.
Start of commercial production
1991-05
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Toshiba Electronic Devices & Storage Corporation
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TC74VHC245F/FK
Pin Assignment
IEC Logic Symbol
DIR
1
20
A1
2
19
A2
3
18
VCC
DIR
B1
A1
(19)
(1)
(2)
G3
3 EN 1 [BA]
3 EN 2 [AB]
(18)
1
B1
2
A3
4
17
B2
A4
5
16
B3
A5
6
15
B4
A3
A6
7
14
B5
A4
A7
8
13
B6
A8
9
12
B7
GND 10
11
B8
A2
A5
A6
A7
(top view)
A8
(3)
(17)
(4)
(16)
(5)
(15)
(6)
(14)
(7)
(13)
(8)
(12)
(9)
(11)
B2
B3
B4
B5
B6
B7
B8
Truth Table
Inputs
Function
Output
DIR
A Bus
L
L
Output
Input
A=B
L
H
Input
Output
B=A
H
X
G
B Bus
Z
Z
X: Don’t care
Z: High impedance
Absolute Maximum Ratings (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage range
VCC
−0.5 to 7.0
V
DC input voltage (DIR, G )
VIN
−0.5 to 7.0
V
DC bus I/O voltage
VI/O
−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
±75
mA
Power dissipation
PD
180
mW
Storage temperature
Tstg
−65 to 150
°C
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).
© 2019
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TC74VHC245F/FK
Operating Ranges (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage
VCC
2.0 to 5.5
V
Input voltage (DIR, G )
VIN
0 to 5.5
V
Bus I/O voltage
VI/O
0 to VCC
V
Operating temperature
Topr
−40 to 85
°C
Input rise and fall time
dt/dv
0 to 100 (VCC = 3.3 ± 0.3 V)
0 to 20 (VCC = 5 ± 0.5 V)
ns/V
Note:
The operating ranges must be maintained to ensure the normal operation of the device. Unused inputs and bus
inputs must be tied to either VCC or GND. Please connect both bus inputs and the bus outputs with VCC or GND
when the I/O of the bus terminal changes by the function. In this case, please note that the output is not shortcircuited.
Electrical Characteristics
DC Characteristics
Characteristics
Test Condition
Symbol
VCC (V)
Min
Typ.
Max
Min
Max
2.0
1.50
VCC ×
0.7
―
―
―
―
―
1.50
VCC ×
0.7
2.0
3.0 to 5.5
―
―
―
―
―
0.50
VCC ×
0.3
0.50
VCC ×
0.3
IOH = −50 μA
2.0
3.0
4.5
1.9
2.9
4.4
2.0
3.0
4.5
―
―
―
1.9
2.9
4.4
―
―
―
IOH = −4 mA
IOH = −8 mA
3.0
4.5
2.58
3.94
―
―
―
―
2.48
3.80
―
―
IOL = 50 μA
2.0
3.0
4.5
―
―
―
0.0
0.0
0.0
0.1
0.1
0.1
―
―
―
0.1
0.1
0.1
IOL = 4 mA
IOL = 8 mA
3.0
4.5
―
―
―
―
0.36
0.36
―
―
0.44
0.44
High-level input
voltage
VIH
―
Low-level input
voltage
VIL
―
High-level output
voltage
VOH
VIN
= VIH or VIL
Ta =
−40 to 85°C
Ta = 25°C
3.0 to 5.5
―
―
Unit
V
V
V
Low-level output
voltage
VOL
3-state output offstate current
IOZ
VIN = VIH or VIL
VOUT = VCC or GND
5.5
―
―
±0.25
―
±2.50
μA
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
VIN
= VIH or VIL
© 2019
Toshiba Electronic Devices & Storage Corporation
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2019-01-31
TC74VHC245F/FK
AC Characteristics (input: tr = tf = 3 ns)
Characteristics
Propagation delay
time
3-state output enable
time
Test Condition
Symbol
VCC (V)
tpZL
tpZH
3-state output disable
time
tpLZ
tpHZ
Output to output skew
tosLH
tosHL
CL (pF)
Min
Typ.
Max
Min
Max
15
―
5.8
8.4
1.0
10.0
50
―
8.3
11.9
1.0
13.5
15
―
4.0
5.5
1.0
6.5
50
―
5.5
7.5
1.0
8.5
15
―
8.5
13.2
1.0
15.5
50
―
11.0
16.7
1.0
19.0
15
―
5.8
8.5
1.0
10.0
50
―
7.3
10.6
1.0
12.0
3.3 ± 0.3
50
―
11.5
15.8
1.0
18.0
5.0 ± 0.5
50
―
7.0
9.7
1.0
11.0
3.3 ± 0.3
50
―
―
1.5
―
1.5
5.0 ± 0.5
50
―
―
1.0
―
1.0
3.3 ± 0.3
tpLH
tpHL
―
5.0 ± 0.5
3.3 ± 0.3
RL = 1 kΩ
5.0 ± 0.5
RL = 1 kΩ
(Note 1)
Ta = −40 to
85°C
Ta = 25°C
Unit
ns
ns
ns
ns
Input capacitance
CIN
DIR, G
―
4
10
―
10
pF
Bus input capacitance
CI/O
An, Bn
―
8
―
―
―
pF
Power dissipation
capacitance
CPD
―
21
―
―
―
pF
(Note 2)
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 / 8 (per bit)
Noise Characteristics (input: tr = tf = 3 ns) (Note)
Characteristics
Test Condition
Symbol
Ta = 25°C
VCC (V)
Typ.
Max
Unit
Quiet output maximum dynamic
VOL
VOLP
CL = 50 pF
5.0
0.7
1.0
V
Quiet output minimum dynamic
VOL
VOLV
CL = 50 pF
5.0
−0.7
−1.0
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
© 2019
Toshiba Electronic Devices & Storage Corporation
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TC74VHC245F/FK
Input Equivalent Circuit
Bus Terminal Equivalent Circuit
DIR,
An, Bn
INPUT
I/O
© 2019
Toshiba Electronic Devices & Storage Corporation
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TC74VHC245F/FK
Package Dimensions
Weight: 0.22 g (typ.)
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Toshiba Electronic Devices & Storage Corporation
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2019-01-31
TC74VHC245F/FK
Package Dimensions
Weight: 0.03 g (typ.)
© 2019
Toshiba Electronic Devices & Storage Corporation
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2019-01-31
TC74VHC245F/FK
RESTRICTIONS ON PRODUCT USE
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Hardware, software and systems described in this document are collectively referred to as “Product”.
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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
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• PRODUCT IS NEITHER INTENDED NOR WARRANTED FOR USE IN EQUIPMENTS OR SYSTEMS THAT REQUIRE
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