MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Octal Bus Buffer/Line Driver
Inverting with 3-State Outputs
The MC74VHCT240A is an advanced high speed CMOS octal bus buffer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation.
The MC74VHCT240A is an inverting 3±state buffer, and has two active±low output enables. This device is designed to be used with 3±state memory address drivers, etc.
The VHCT inputs are compatible with TTL levels. This device can be used as a level converter for interfacing 3.3V to 5.0V, because it has full 5V CMOS level output swings.
The VHCT240A input and output (when disabled) structures provide protection when voltages between 0V and 5.5V are applied, regardless of the supply voltage. These input and output structures help prevent device destruction caused by supply voltage ± input/output voltage mismatch, battery backup, hot insertion, etc.
•High Speed: tPD = 5.6ns (Typ) at VCC = 5V
•Low Power Dissipation: ICC = 4μA (Max) at TA = 25°C
•TTL±Compatible Inputs: VIL = 0.8V; VIH = 2.0V
•Power Down Protection Provided on Inputs and Outputs
•Balanced Propagation Delays
•Designed for 4.5V to 5.5V Operating Range
•Low Noise: VOLP = 1.1V (Max)
•Pin and Function Compatible with Other Standard Logic Families
•Latchup Performance Exceeds 300mA
•ESD Performance: HBM > 2000V; Machine Model > 200V
•Chip Complexity: 110 FETs or 27.5 Equivalent Gates
LOGIC DIAGRAM
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A1 |
2 |
18 |
YA1 |
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A2 |
4 |
16 |
YA2 |
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A3 |
6 |
14 |
YA3 |
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A4 |
8 |
12 |
YA4 |
DATA |
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INVERTING |
INPUTS |
B1 |
11 |
9 |
OUTPUTS |
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YB1 |
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B2 |
13 |
7 |
YB2 |
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B3 |
15 |
5 |
YB3 |
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B4 |
17 |
3 |
YB4 |
OUTPUT |
OEA |
1 |
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ENABLES |
OEB |
19 |
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MC74VHCT240A
DW SUFFIX
20±LEAD SOIC PACKAGE
CASE 751D±04
DT SUFFIX
20±LEAD TSSOP PACKAGE
CASE 948E±02
M SUFFIX
20±LEAD SOIC EIAJ PACKAGE
CASE 967±01
ORDERING INFORMATION
MC74VHCTXXXADW SOIC
MC74VHCTXXXADT TSSOP
MC74VHCTXXXAM SOIC EIAJ
PIN ASSIGNMENT
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1 |
20 |
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OEA |
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VCC |
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A1 |
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2 |
19 |
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OEB |
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YB4 |
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3 |
18 |
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YA1 |
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A2 |
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4 |
17 |
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B4 |
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YB3 |
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5 |
16 |
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YA2 |
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A3 |
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6 |
15 |
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B3 |
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7 |
14 |
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YB2 |
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YA3 |
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A4 |
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8 |
13 |
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B2 |
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9 |
12 |
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YB1 |
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YA4 |
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GND |
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10 |
11 |
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B1 |
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FUNCTION TABLE
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INPUTS |
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OUTPUTS |
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OEA, OEB |
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A, B |
YA, YB |
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L |
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L |
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H |
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L |
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H |
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L |
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H |
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X |
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Z |
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6/97
Motorola, Inc. 1997 |
1 |
REV 0 |
MC74VHCT240A
MAXIMUM RATINGS*
Symbol |
Parameter |
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Value |
Unit |
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VCC |
DC Supply Voltage |
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± 0.5 to + 7.0 |
V |
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Vin |
DC Input Voltage |
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± 0.5 to + 7.0 |
V |
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Vout |
DC Output Voltage |
Output in 3±State |
± 0.5 to + 7.0 |
V |
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High or Low State |
± 0.5 to VCC + 0.5 |
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IIK |
Input Diode Current |
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± 20 |
mA |
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IOK |
Output Diode Current (VOUT < GND; VOUT > VCC) |
± 20 |
mA |
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Iout |
DC Output Current, per Pin |
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± 25 |
mA |
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ICC |
DC Supply Current, VCC and GND Pins |
± 75 |
mA |
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PD |
Power Dissipation in Still Air, |
SOIC Packages² |
500 |
mW |
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TSSOP Package² |
450 |
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Tstg |
Storage Temperature |
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± 65 to + 150 |
_C |
*Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute±maximum±rated conditions is not implied.
²Derating Ð SOIC Packages: ± 7 mW/ _C from 65_ to 125_C TSSOP Package: ± 6.1 mW/_C from 65_ to 125_C
RECOMMENDED OPERATING CONDITIONS
Symbol |
Parameter |
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Min |
Max |
Unit |
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VCC |
DC Supply Voltage |
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4.5 |
5.5 |
V |
Vin |
DC Input Voltage |
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0 |
5.5 |
V |
Vout |
DC Output Voltage |
Output in 3±State |
0 |
5.5 |
V |
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High or Low State |
0 |
VCC |
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TA |
Operating Temperature |
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± 40 |
+ 85 |
_C |
tr, tf |
Input Rise and Fall Time |
VCC =5.0V ±0.5V |
0 |
20 |
ns/V |
DC ELECTRICAL CHARACTERISTICS
This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high±impedance circuit. For proper operation, Vin and Vout should be constrained to the
range GND v (Vin or Vout) v VCC. Unused inputs must always be
tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open.
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VCC |
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TA = 25°C |
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TA = ± 40 to 85°C |
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Symbol |
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Parameter |
Test Conditions |
V |
Min |
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Typ |
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Max |
Min |
Max |
Unit |
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VIH |
Minimum High±Level |
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4.5 to |
2.0 |
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2.0 |
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V |
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Input Voltage |
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5.5 |
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VIL |
Maximum Low±Level |
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4.5 to |
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0.8 |
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0.8 |
V |
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Input Voltage |
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5.5 |
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VOH |
Minimum High±Level |
IOH = ± 50μA |
4.5 |
4.4 |
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4.5 |
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4.4 |
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V |
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Output Voltage |
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V |
= V |
IH |
or V |
IL |
IOH = ± 8mA |
4.5 |
3.94 |
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3.80 |
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in |
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VOL |
Maximum Low±Level |
IOL = 50μA |
4.5 |
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0.0 |
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0.1 |
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0.1 |
V |
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Output Voltage |
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V |
= V |
IH |
or V |
IL |
IOL = 8mA |
4.5 |
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0.36 |
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0.44 |
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in |
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Iin |
Maximum Input |
Vin = 5.5 V or GND |
0 to 5.5 |
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± 0.1 |
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± 1.0 |
μA |
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Leakage Current |
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IOZ |
Maximum 3±State |
Vin = VIL or VIH |
5.5 |
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± 0.25 |
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± 2.5 |
μA |
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Leakage Current |
Vout = VCC or GND |
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ICC |
Maximum Quiescent |
Vin = VCC or GND |
5.5 |
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4.0 |
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40.0 |
μA |
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Supply Current |
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MOTOROLA |
2 |
VHC Data ± Advanced CMOS Logic |
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DL203 Ð Rev 1 |