TC74VHCT540,541AF/AFT/AFK
2014-03-01
1
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHCT540AF, TC74VHCT540AFT, TC74VHCT540AFK
TC74VHCT541AF, TC74VHCT541AFT, TC74VHCT541AFK
Octal Bus Buffer
TC74VHCT540AF/AFT/AFK
Inverted, 3-State Outputs
TC74VHCT541AF/AFT/AFK
Non-Inverted, 3-State Outputs
The TC74VHCT540A and 541A are advanced high speed
CMOS OCTAL BUS BUFFERs fabricated with silicon gate
C2MOS technology. They achieve the high speed operation
similar to equivalent Bipolar Schottky TTL while maintaining
the CMOS low power dissipation.
The TC74VHCT540A is an inverting type and, the
TC74VHCT541A is a non-inverting type.
When either 1G or 2G are high, the terminal outputs are in
the high-impedance state.
The input voltage are compatible with TTL output voltage.
These devices may be used as a level converter for interfacing
3.3 V to 5 V system.
Input protection and output circuit ensure that 0 to 5.5 V can
be applied to the input and output (Note) pins without regard to
the supply voltage. These structure prevents device destruction
due to mismatched supply and input/output voltages such as
battery back up, hot board insertion, etc.
Note: Output in off-state
Features
High speed: tpd = 5.4 ns (typ.) at VCC = 5 V
Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
Compatible with TTL inputs: VIL = 0.8 V (max)
V
IH = 2.0 V (min)
Power down protection is provided on all inputs and outputs
Balanced propagation delays: tpLH tpHL
Low noise: VOLP = 1.5 V (max)
Pin and function compatible with the 74 series
(74AC/HC/F/ALS/LS etc.) 540/541 type.
TC74VHCT540AF, TC74VHCT541AF
TC74VHCT540AFT, TC74VHCT541AFT
TC74VHCT540AFK, TC74VHCT541AFK
Weight
SOP20-P-300-1.27A: 0.22 g (typ.)
TSSOP20-P-0044-0.65A: 0.08 g (typ.)
VSSOP20-P-0030-0.50: 0.03 g (typ.)
Start of commercial production
1995-09
TC74VHCT540,541AF/AFT/AFK
2014-03-01
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Pin Assignment
IEC Logic Symbol
Truth Table
Inputs Outputs
1G 2G A
n Y
n n
Y
H X X Z Z
X H X Z Z
L L H H L
L L L L H
X: Don’t care
Z: High impedance
Yn: VHCT541A
n
Y: VHCT540A
VCC
16
2Y
3Y
4Y15
14
13
12
11
20
1
2
3
4
5
6
7
A5
A6
A7
A8
A1
5Y
8
1Y
19
6Y
2G
A3
A4
18
9
A2
GND 10 8Y
17
7Y
(top view)
TC74VHCT540A
1G VCC
16
15
14
13
12
11
20
1
2
3
4
5
6
7
A5
A6
A7
A8
A1
8
19 2G
A3
A4
18
9
A2
GND 10
17
(top view)
TC74VHCT541A
Y2
Y1
Y4
Y5
Y6
Y7
Y3
Y8
1G
(19)
(1)
(2)
(4)
(3)
A8
A2
A1
(6)
(5)
(8)
(7)
(9)
A3
A6
A5
A7
(18)
(16)
(14)
(12)
8Y
2Y
4Y
6Y
(17)
(15)
(13)
1Y
3Y
5Y
EN
(11)
7Y
A4
&
TC74VHCT540A
1G
2G (19)
(1)
(2)
(4)
(3)
A8
A2
A1
(6)
(5)
(8)
(7)
(9)
A3
A6
A5
A7
(18)
(16)
(14)
(12)
Y8
Y2
Y4
Y6
(17)
(15)
(13)
Y1
Y3
Y5
EN
(11)
Y7
A4
&
TC74VHCT541A
1G
2G
TC74VHCT540,541AF/AFT/AFK
2014-03-01
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Absolute Maximum Ratings (Note 1)
Characteristics Symbol Rating Unit
Supply voltage range VCC 0.5 to 7.0 V
DC input voltage VIN 0.5 to 7.0 V
0.5 to 7.0 (Note 2)
DC output voltage VOUT
0.5 to VCC + 0.5 (Note 3)
V
Input diode current IIK 20 mA
Output diode current IOK ±20 (Note 4) 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 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 Rating Unit
Supply voltage VCC 4.5 to 5.5 V
Input voltage VIN 0 to 5.5 V
0 to 5.5 (Note 2)
Output voltage VOUT 0 to VCC (Note 3)
V
Operating temperature Topr 40 to 85 °C
Input rise and fall time dt/dV 0 to 20 ns/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.
Note 2: Output in off-state
Note 3: High or low state
TC74VHCT540,541AF/AFT/AFK
2014-03-01
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Electrical Characteristics
DC Characteristics
Test Condition Ta = 25°C Ta =
40 to 85°C
Characteristics Symbol
VCC (V) Min Typ. Max Min Max
Unit
High-level input
voltage VIH 4.5 to 5.5 2.0 2.0 V
Low-level input
voltage VIL 4.5 to 5.5 0.8 0.8 V
IOH = 50 μA 4.5 4.40 4.50 4.40
High-level output
voltage VOH VIN
= VIH or VIL IOH = 8 mA 4.5 3.94 3.80
V
IOL = 50 μA 4.5 0.0 0.10 0.10
Low-level output
voltage VOL VIN
= VIH or VIL IOL = 8 mA 4.5 0.36 0.44
V
3-state output
off-state 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
ICC VIN = VCC or GND 5.5 4.0 40.0 μA
Quiescent supply
current ICCT Per input: VIN = 3.4 V
Other input: VCC or GND 5.5 1.35 1.50 mA
Output leakage
current IOPD V
OUT = 5.5 V 0 +0.5 +5.0 μA
AC Characteristics (input: tr = tf = 3 ns)
Test Condition Ta = 25°C Ta =
40 to 85°C
Characteristics Symbol
VCC (V) CL (pF) Min Typ. Max Min Max
Unit
15 5.4 7.4 1.0 8.5
Propagation delay
time
(TC74VHCT540A)
tpLH
tpHL
5.0 ± 0.5
50 5.9 8.4 1.0 9.5
ns
15 5.0 6.9 1.0 8.0
Propagation delay
time
(TC74VHCT541A)
tpLH
tpHL
5.0 ± 0.5
50 5.5 7.9 1.0 9.0
ns
15 8.3 11.3 1.0 13.0
3-state output enable
time
tpZL
tpZH
RL = 1 kΩ 5.0 ± 0.5
50 8.8 12.3 1.0 14.0
ns
3-state output disable
time
tpLZ
tpHZ
RL = 1 kΩ 5.0 ± 0.5 50 9.4 11.9 1.0 13.5 ns
Output to output skew tosLH
tosHL
(Note 1) 5.0 ± 0.5 50 1.0 1.0 ns
Input capacitance CIN 4 10 10 pF
Output capacitance COUT 9 pF
Power dissipation
capacitance CPD (Note 2) 19 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 / 8 (per bit)
TC74VHCT540,541AF/AFT/AFK
2014-03-01
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Noise Characteristics (input: tr = tf = 3 ns)
Test Condition Ta = 25°C
Characteristics Symbol
VCC (V) Typ. Limit
Unit
Quiet output maximum dynamic VOL V
OLP CL = 50 pF 5.0 1.1 1.5 V
Quiet output minimum dynamic VOL V
OLV CL = 50 pF 5.0 1.1 1.5 V
Minimum high level dynamic input
voltage VIHD CL = 50 pF 5.0 2.0 V
Maximum low level dynamic input
voltage VILD CL = 50 pF 5.0 0.8 V
TC74VHCT540,541AF/AFT/AFK
2014-03-01
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Package Dimensions
Weight: 0.22 g (typ.)
TC74VHCT540,541AF/AFT/AFK
2014-03-01
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Package Dimensions
Weight: 0.08 g (typ.)
TC74VHCT540,541AF/AFT/AFK
2014-03-01
8
Package Dimensions
Weight: 0.03 g (typ.)
TC74VHCT540,541AF/AFT/AFK
2014-03-01
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