TC74LCX245F/FK
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74LCX245F, TC74LCX245FK
Low-Voltage Octal Bus Transceiver with 5-V Tolerant Inputs and Outputs
The TC74LCX245 is a high-performance CMOS octal bus transceiver.
Designed for use in 3.3-V systems, it achieves high-speed operation
while maintaining the CMOS low power dissipation.
The device is designed for low-voltage (3.3 V) VCC applications, but it
could be used to interface to 5-V supply environment for both inputs and
outputs.
The direction of data transmission is determined by the level of the
DIR input. The enable input ( OE ) can be used to disable the device so
that the busses are effectively isolated.
All inputs are equipped with protection circuits against static
discharge.
TC74LCX245F
TC74LCX245FK
Features (Note)
Low-voltage operation: VCC 1.65 to 3.6 V
High-speed operation: tpd 7.0 ns (max) (VCC 3.0 to 3.6 V)
Ouput current: |IOH|/IOL 24 mA (min) (VCC 3.0 V)
Available in JEITA SOP, VSSOP (US)
Bidirectional interface between 5.0 V and 3.3 V signals
Power-down protection provided on all inputs and outputs
Pin and function compatible with the 74 series
Weight
SOP20-P-300-1.27A
VSSOP20-P-0030-0.50
: 0.22 g ( typ.)
: 0.03 g ( typ.)
(74AC/VHC/HC/F/ALS/LS etc.) 245 type
Note: Do not apply a signal to any bus pins when it is in the output mode. Damage may result.
All floating (high impedance) bus pins must have their input levels fixed by means of pull-up or pull-down resistors.
Note: The Electrical Characteristics of VCC = 1.8 0.15 V is only applicable for products which manufactured
from January 2009 onward.
Start of commercial production
1994-03
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Toshiba Electronic Devices & Storage Corporation
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TC74LCX245F/FK
Pin Assignment (top view)
DIR
1
IEC Logic Symbol
20
A1
2
19
A2
3
18
VCC
DIR
19
1
G3
3EN1 (BA)
3EN2 (AB)
B1
A1
2
18
1
B1
A3
4
17
B2
A4
5
16
B3
A2
3
17
B2
A5
6
15
B4
A3
4
16
B3
A6
7
14
B5
A4
5
15
B4
A7
8
13
B6
A5
6
14
B5
A6
7
13
B6
A7
8
12
B7
A8
9
11
B8
9
12
B7
GND 10
11
B8
A8
2
Truth Table
Inputs
Function
Outputs
OE
DIR
A-Bus
B-Bus
L
L
AB
Output
Input
L
H
BA
Input
Output
H
X
Z
Z
X: Don’t care
Z: High impedance
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TC74LCX245F/FK
Absolute Maximum Ratings (Note 1)
Characteristics
Symbol
Rating
Unit
Power supply voltage
VCC
0.5 to 7.0
V
DC input voltage
(DIR, OE )
VIN
0.5 to 7.0
V
DC bus I/O voltage
VI/O
0.5 to 7.0 (Note 2)
0.5 to VCC 0.5
(Note 3)
50
V
Input diode current
IIK
Output diode current
IOK
DC output current
IOUT
50
mA
Power dissipation
PD
180
mW
ICC/IGND
100
mA
Tstg
65 to 150
°C
DC VCC/ground current
Storage temperature
50
mA
(Note 4)
mA
Note 1: 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).
Note 2: Output in OFF state
Note 3: High or low state. IOUT absolute maximum rating must be observed.
Note 4: VOUT GND, VOUT VCC
Operating Ranges (Note 1)
Characteristics
Symbol
Power supply voltage
VCC
Input voltage
VIN
(DIR, OE )
Bus I/O voltage
VI/O
Output current
IOH/IOL
Operating temperature
Topr
Input rise and fall time
dt/dv
Rating
Unit
1.65 to 3.6
1.5 to 3.6 (Note 2)
0 to 5.5
V
V
0 to 5.5 (Note 3)
0 to VCC (Note 4)
24
(Note 5)
12
(Note 6)
40 to 85
0 to 10 (Note 7)
V
mA
°C
ns/V
Note 1: The operating ranges are required 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 short-circuited.
Note 2: Data retention only
Note 3: Output in OFF state
Note 4: High or low state
Note 5: VCC 3.0 to 3.6 V
Note 6: VCC 2.7 to 3.0 V
Note 7: VIN 0.8 to 2.0 V, VCC 3.0 V
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TC74LCX245F/FK
Electrical Characteristics
DC Characteristics (Ta 40 to 85°C)
Characteristics
Symbol
Test Condition
Min
Max
1.65 to 2.3
VCC×0.9
2.3 to 2.7
1.7
2.7 to 3.6
2.0
1.65 to 2.3
VCC×0.1
2.3 to 2.7
0.7
2.7 to 3.6
0.8
1.65 to 3.6
VCC0.2
IOH mA
1.65
1.05
IOH 8 mA
2.3
1.7
IOH 12 mA
2.7
2.2
IOH 18 mA
3.0
2.4
IOH 24 mA
3.0
2.2
IOL 100 A
1.65 to 3.6
0.2
IOL 4 mA
1.65
0.45
IOL 8 mA
2.3
0.7
IOL 12 mA
2.7
0.4
IOL 16 mA
3.0
0.4
IOL 24 mA
3.0
0.55
Unit
VCC (V)
H-level
VIH
Input voltage
L-level
VIL
IOH 100 A
H-level
VOH
VIN VIH or VIL
Output voltage
L-level
VOL
VIN VIH or VIL
V
V
Input leakage current
IIN
VIN 0 to 5.5 V
1.65 to 3.6
5.0
A
3-state output OFF state current
IOZ
VIN VIH or VIL
VOUT 0 to 5.5 V
1.65 to 3.6
5.0
A
Power-off leakage current
IOFF
VIN/VOUT 5.5 V
0
10.0
A
10.0
ICC
VIN VCC or GND
1.65 to 3.6
Quiescent supply current
VIN/VOUT 3.6 to 5.5 V
1.65 to 3.6
10.0
VIH VCC 0.6V (per 1 input)
2.7 to 3.6
500
Increase in ICC per input
ICC
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Toshiba Electronic Devices & Storage Corporation
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A
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TC74LCX245F/FK
AC Characteristics (Ta 40 to 85°C)
Characteristics
Symbol
Test Condition
Min
Max
1.8 0.15
25.0
2.5 0.2
9.0
2.7
8.0
3.3 0.3
1.5
7.0
1.8 0.15
34.0
2.5 0.2
17.0
2.7
9.5
3.3 0.3
1.5
8.5
1.8 0.15
32.0
2.5 0.2
16.0
2.7
8.5
3.3 0.3
1.5
7.5
2.7
3.3 0.3
1.0
Unit
VCC (V)
Propagation delay time
Output enable time
Output disable time
Output to output skew
Note:
tpLH
tpHL
tpZL
tpZH
tpLZ
tpHZ
Figure 1, Figure 2
Figure 1, Figure 3
Figure 1, Figure 3
tosLH
tosHL
(Note)
ns
ns
ns
ns
Parameter guaranteed by design.
(tosLH |tpLHm tpLHn|, tosHL |tpHLm tpHLn|)
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Toshiba Electronic Devices & Storage Corporation
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TC74LCX245F/FK
Dynamic Switching Characteristics (Ta 25°C, input: tr tf 2.5 ns, CL 50 pF, RL 500 )
Characteristics
Symbol
Test Condition
Typ.
Unit
VCC (V)
Quiet output maximum dynamic VOL
VOLP
VIH 3.3 V, VIL 0 V
3.3
0.8
V
Quiet output minimum dynamic VOL
|VOLV|
VIH 3.3 V, VIL 0 V
3.3
0.8
V
Typ.
Unit
Capacitive Characteristics (Ta 25°C)
Characteristics
Symbol
Test Condition
VCC (V)
Input capacitance
CIN
DIR, OE
3.3
7
pF
Bus input capacitance
CI/O
An, Bn
3.3
8
pF
Power dissipation capacitance
CPD
fIN 10 MHz
3.3
25
pF
Note:
(Note)
CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current
consumption.
Average operating current can be obtained by the equation:
ICC (opr) CPD・VCC・fIN ICC/8 (per bit)
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TC74LCX245F/FK
AC Test Circuit
RL
Switch
Open
6.0 V or VCC×2
GND
Parameter
Switch
tpLH, tpHL
Open
6.0 V
Measure
tpLZ, tpZL
RL
CL
Output
tpHZ, tpZH
@ VCC = 3.3 0.3 V
@ VCC = 2.7 V
VCC×2 @ VCC = 2.5 0.2 V
@ VCC = 1.8 0.15 V
GND
Figure 1
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TC74LCX245F/FK
AC Waveform
tr
tf
VIH
90%
VIM
Input
(An, Bn)
10%
GND
VOH
Output
(Bn, An)
VOM
tpLH
VOL
tpHL
Figure 2
tpLH, tpHL
tr
tf
VIH
90%
VIM
Output Enable
(
)
10%
tpLZ
GND
tpZL
VOH
Output (An, Bn)
Low to Off to Low
VOM
tpHZ
VX
VOH
VY
Output (An, Bn)
High to Off to High
VOL
tpZH
VOM
GND
Outputs
enabled
Outputs
disabled
Figure 3
Outputs
enabled
tpLZ, tpHZ, tpZL, tpZH
VCC
Symbol
3.3 0.3 V
2.7 V
Input
Output
Load
2.5 0.2 V
1.8 0.15 V
VIH
2.7 V
VCC
VCC
VIM
1.5 V
VCC/2
VCC/2
tr, tf
2.5 ns
2.0 ns
2.0 ns
VOM
1.5 V
VOH/2
VOH/2
VX
VOL +0.3 V
VOL +0.15 V
VOL +0.15 V
VY
VOH -0.3 V
VOL -0.15 V
VOL -0.15 V
CL
50 pF
30 pF
30 pF
RL
500 Ω
500 Ω
1 kΩ
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TC74LCX245F/FK
Package Dimensions
Weight: 0.22 g (typ.)
© 2018-2021
Toshiba Electronic Devices & Storage Corporation
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TC74LCX245F/FK
Package Dimensions
Weight: 0.03 g (typ.)
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Toshiba Electronic Devices & Storage Corporation
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TC74LCX245F/FK
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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
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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
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applicability of any information contained in this document, or in charts, diagrams, programs, algorithms, sample application circuits, or any
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