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The MC74VHCT125A is a high speed CMOS quad 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 MC74VHCT125A requires the 3state control input (OE) to be set High to place the output into the high impedance state. 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 VHCT125A input structures provide protection when voltages between 0V and 5.5V are applied, regardless of the supply voltage. The output structures also provide protection when VCC = 0V. These input and output structures help prevent device destruction caused by supply voltage input/output voltage mismatch, battery backup, hot insertion, etc.
The internal circuit is composed of three stages, including a buffer output which provides high noise immunity and stable output. The inputs tolerate voltages up to 7V, allowing the interface of 5V systems to 3V systems.
MC74VHCT125A Maximum Ratings
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage (Referenced to GND)
0.5 to +7.0
V
Vi
DC Input Voltage (Referenced to GND)
0.5 to +7.0
V
Vout
DC Output Voltage (Referenced to GND)
0.5toVCC + 0.5
V
Iik
DC Input Current, per Pin
-20
mA
Iok
DC Output Sink/Source Current, per Pin
±20
mA
lout
DC Output Source/Sink Current
±25
ICC
DC VCC or GND Current per Output Pin
±50
mA
pd
Power dissipation in still
500 400
Tstg
Storage Temperature
65 to +150
°C
MC74VHCT125A Features
• High Speed: tPD = 3.8ns (Typ) at VCC = 5V • Low Power Dissipation: ICC = 4mA (Max) at TA = 25°C • TTLCompatible Inputs: VIL = 0.8V; VIH = 2.0V • Power Down Protection Provided on Inputs • Balanced Propagation Delays • Designed for 2V to 5.5V Operating Range • Low Noise: VOLP = 0.8V (Max) • Pin and Function Compatible with Other Standard Logic Families • Latchup Performance Exceeds 300mA • ESD Performance: HBM > 2000V; Machine Model > 200V • Chip Complexity: 72 FETs or 18 Equivalent Gates