Document
TC74LVX245F/FT
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74LVX245F, TC74LVX245FT
Octal Bus Transceiver
The TC74LVX245F/ FT is a high-speed CMOS octal bus transceiver fabricated using silicon gate CMOS technology. Designed for use in 3-V systems, it achieves high-speed operation while maintaining the CMOS low power dissipation.
These devices are suitable for low-voltage and battery operated systems.
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.
Features (Note)
• High-speed: tpd = 4.7 ns (typ.) (VCC = 3.3 V) • Low power dissipation: ICC = 4 μA (max) (Ta = 25°C) • Input voltage level: VIL = 0.8 V (max) (VCC = 3 V)
VIH = 2.0 V (min) (VCC = 3 V) • Balanced propagation delays: tpLH ∼− tpHL • Low noise: VOLP = 0.8 V (max) • Pin and function compatible with 74HC245
TC74LVX245F TC74LVX245FT
Weight SOP20-P-300-1.27A TSSOP20-P-0044-0.65A
: 0.22 g (typ.) : 0.08 g (typ.)
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. 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
1993-01
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TC74LVX245F/FT
Pin Assignment (top view)
DIR 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9 GND 10
20 VCC 19 G 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8
IEC Logic Symbol
G (19) (1)
DIR
G3 3 EN 1 (BA) 3 EN 2 (AB)
(2)
A1
1
2
(3) A2
(4) A3
(5) A4
(6) A5
(7) A6
(8) A7
(9) A8
(18) B1
(17) B2
(16) B3
(15) B4
(14) B5
(13) B6
(12) B7
(11) B8
Truth Table
Inputs
G
DIR
L
L
L
H
H
X
X: Don’t care Z: High impedance
Outputs
A=B B=A
Z
Function
A-Bus
B-Bus
Output
Input
Input
Output
High impedance
Absolute Maximum Ratings (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage range DC input voltage
(DIR, G ) DC bus I/O voltage Input diode current Output diode current DC output current DC VCC/ground current Power dissipation Storage temperature
VCC
VIN
VI/O IIK IOK IOUT ICC PD Tstg
−0.5 to 7.0
V
−0.5 to 7.0
V
−0.5 to VCC + 0.5
V
−20
mA
±20
mA
±25
mA
±75
mA
180
mW
−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).
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TC74LVX245F/FT
Operating Ranges (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage Input voltage
(DIR, G ) Bus I/O voltage Operating temperature Input rise and fall time
VCC
VIN
VI/O Topr dt/dv
2.0 to 3.6
0 to 5.5
0 to VCC −40 to 85 0 to 100
V
V
V °C 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 short-circuited.
Electrical Characteristics
DC Characteristics
Characteristics
Input voltage
H-level L-level
H-level Output voltage
L-level
3-State output Off-state current Input leakage current Quiescent supply current
Symbol
Test Condition
Ta = 25°C
Ta = −40 to 85°C Unit
VCC (V) Min Typ. Max Min Max
2.0
1.5
⎯
⎯
1.5
⎯
VIH
⎯
3.0
2.0
⎯
⎯
2.0
⎯
3.6
2.4
⎯
⎯
2.4
⎯
V
2.0
⎯
⎯
0.5
⎯
0.5
VIL
⎯
3.0
⎯
⎯
0.8
⎯
0.8
3.6
⎯
⎯
0.8
⎯
0.8
IOH = −50 μA 2.0
1.9 2.0
⎯
1.9
⎯
VOH
VIN = VIH or VIL
IOH = −50 μA
3.0
2.9 3.0
⎯
2.9
⎯
IOH = −4 mA
3.0
2.58
⎯
⎯ 2.48 ⎯
V
IOL = 50 μA
2.0
⎯
0
0.1
⎯
0.1
VOL
VIN = VIH or VIL
IOL = 50 μA
3.0
⎯
0
0.1
⎯
0.1
IOL = 4 mA
3.0
⎯
⎯ 0.36 ⎯ 0.44
IOZ
VIN = VIH or VIL VOUT = VCC or GND
3.6
⎯
⎯ ±0.25 ⎯ ±2.5 μA
IIN VIN = 5.5 V or GND
3.6
⎯
⎯ ±0.1 ⎯ ±1.0 μA
ICC VIN = VCC or GND
3.6
⎯
⎯
4.0
⎯ 40.0 μA
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2014-03-01
TC74LVX245F/FT
AC Cha.