ST M74HCT540 User Manual
M74HCT540
OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED)
■HIGH SPEED:
tPD = 12ns (TYP.) at VCC = 4.5V
■LOW POWER DISSIPATION: ICC = 4μA(MAX.) at TA=25°C
■COMPATIBLE WITH TTL OUTPUTS : VIH = 2V (MIN.) VIL = 0.8V (MAX)
■BALANCED PROPAGATION DELAYS: tPLH tPHL
■SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 6mA (MIN)
■PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 540
DESCRIPTION
The 74HCT540 is an advanced high-speed CMOS OCTAL BUS BUFFER (3-STATE) fabricated with silicon gate C2MOS technology. The M74HCT540 is an inverting buffer.
The 3-STATE control gate operates as a two input AND such that if either G1 and G2 are high, all eight output are in the high impedance state. In order to enhance PC board layout the M74HCT540 offer a pinout having inputs and outputs on opposite sides of the package.
DIP |
SOP |
TSSOP |
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ORDER CODES |
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PACKAGE |
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TUBE |
T & R |
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DIP |
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M74HCT540B1R |
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SOP |
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M74HCT540M1R |
M74HCT540RM13TR |
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TSSOP |
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M74HCT540TTR |
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The M74HCT540 is designed to directly interface HSC2MOS systems with TTL and NMOS components.
All inputs are equipped with protection circuits against static discharge and transient excess voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 2001 |
1/9 |
M74HCT541
INPUT AND OUTPUT EQUIVALENT CIRCUIT |
PIN DESCRIPTION |
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PIN No |
SYMBOL |
NAME AND FUNCTION |
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1, 19 |
G1, G2 |
Output Enable Inputs |
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2, 3, 4, 5, 6, |
A1 to A8 |
Data Inputs |
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7, 8, 9 |
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18, 17, 16, |
Y1 to Y8 |
Bus Outputs |
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15, 14, 13, |
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12, 11 |
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10 |
GND |
Ground (0V) |
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20 |
VCC |
Positive Supply Voltage |
TRUTH TABLE
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INPUT |
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OUTPUT |
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G1 |
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G2 |
An |
Yn |
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H |
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X |
X |
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Z |
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X |
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H |
X |
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Z |
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L |
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L |
H |
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L |
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L |
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L |
L |
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H |
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X : Don’t Care |
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Z : High Impedance |
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ABSOLUTE MAXIMUM RATINGS |
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Symbol |
Parameter |
Value |
Unit |
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VCC |
Supply Voltage |
-0.5 to +7 |
V |
VI |
DC Input Voltage |
-0.5 to VCC + 0.5 |
V |
VO |
DC Output Voltage |
-0.5 to VCC + 0.5 |
V |
IIK |
DC Input Diode Current |
± 20 |
mA |
IOK |
DC Output Diode Current |
± 20 |
mA |
IO |
DC Output Current |
± 35 |
mA |
ICC or IGND |
DC VCC or Ground Current |
± 70 |
mA |
PD |
Power Dissipation |
500(*) |
mW |
Tstg |
Storage Temperature |
-65 to +150 |
°C |
TL |
Lead Temperature (10 sec) |
300 |
°C |
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied
(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
Symbol |
Parameter |
Value |
Unit |
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VCC |
Supply Voltage |
4.5 to 5.5 |
V |
VI |
Input Voltage |
0 to VCC |
V |
VO |
Output Voltage |
0 to VCC |
V |
Top |
Operating Temperature |
-55 to 125 |
°C |
tr, tf |
Input Rise and Fall Time (VCC = 4.5 to 5.5V) |
0 to 500 |
ns |
2/9 |
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M74HCT541
DC SPECIFICATIONS
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Test Condition |
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Value |
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Symbol |
Parameter |
VCC |
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TA = 25°C |
-40 to 85°C |
-55 to 125°C |
Unit |
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(V) |
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Min. |
Typ. |
Max. |
Min. |
Max. |
Min. |
Max. |
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VIH |
High Level Input |
4.5 |
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2.0 |
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2.0 |
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2.0 |
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V |
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Voltage |
to |
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5.5 |
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VIL |
Low Level Input |
4.5 |
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0.8 |
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0.8 |
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0.8 |
V |
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Voltage |
to |
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5.5 |
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VOH |
High Level Output |
4.5 |
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IO=-20 μA |
4.4 |
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4.5 |
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4.4 |
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4.4 |
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V |
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Voltage |
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IO=-6.0 mA |
4.18 |
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4.31 |
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4.13 |
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4.10 |
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VOL |
Low Level Output |
4.5 |
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IO=20 μA |
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0.0 |
0.1 |
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0.1 |
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0.1 |
V |
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Voltage |
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IO=6.0 mA |
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0.17 |
0.26 |
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0.33 |
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0.40 |
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II |
Input Leakage |
5.5 |
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VI = VCC or GND |
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± 0.1 |
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± 1 |
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± 1 |
μA |
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Current |
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IOZ |
High Impedance |
5.5 |
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VI = VIH or VIL |
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± 0.5 |
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± 5 |
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± 10 |
μA |
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Output Leakage |
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VO = VCC or GND |
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Current |
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ICC |
Quiescent Supply |
5.5 |
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VI = VCC or GND |
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4 |
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40 |
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80 |
μA |
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Current |
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ICC |
Additional Worst |
5.5 |
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Per Input pin |
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2.0 |
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2.9 |
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3.0 |
mA |
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Case Supply |
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VI = 0.5V or |
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Current |
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VI = 2.4V |
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Other Inputs at |
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VCC or GND |
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AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
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Test Condition |
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Value |
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Symbol |
Parameter |
VCC |
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CL |
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TA = 25°C |
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-40 to 85°C |
-55 to 125°C |
Unit |
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(V) |
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(pF) |
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Min. |
Typ. |
Max. |
Min. |
Max. |
Min. |
Max. |
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tTLH tTHL |
Output Transition |
4.5 |
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50 |
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6 |
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12 |
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15 |
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18 |
ns |
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Time |
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tPLH tPHL |
Propagation Delay |
4.5 |
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50 |
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12 |
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20 |
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25 |
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30 |
ns |
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Time |
4.5 |
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150 |
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16 |
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25 |
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31 |
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38 |
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tPZL tPZH |
Output Enable |
4.5 |
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50 |
RL = 1 KΩ |
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18 |
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30 |
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38 |
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45 |
ns |
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Time |
4.5 |
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150 |
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22 |
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34 |
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43 |
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51 |
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tPLZ tPHZ |
Output Disable |
4.5 |
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50 |
RL = 1 KΩ |
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19 |
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27 |
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34 |
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41 |
ns |
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Time |
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3/9
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