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74LVC257A
9.6.
9.6.1.
Features
Wide supply voltage range of 1.2 to 3.6 V
In accordance with JEDEC standard no. 8-1A
CMOS lower power consumption
Direct interface with TTL levels
Output drive capability 50 _ transmission lines at 85°C
5 Volt tolerant inputs/outputs, for interfacing with 5 Volt logic
9.6.2.
Description
The 74LVC257A is a high-performance, low-power, low-voltage, Si-gate CMOS device and superior to
most advanced CMOS compatible TTL families.
Inputs can be driven from either 3.3V or 5.0V devices. In 3-State operation, outputs can handle 5V. This
feature allows the use of these devices as translators in a mixed 3.3V/5V environment.
The 74LVC257A is a quad 2-input multiplexer with 3-state outputs, which select 4 bits of data from two
sources and are controlled by a common data select input (S). The data inputs from source 0 (1l 0 to 4l
0 ) are selected when input S is LOW and the data inputs from source 1 (1l 1 to 4l 1 ) are selected
when S in HIGH. Data appears at the outputs (1Y to 4Y) in true (non-inverting) form from the selected
inputs. The 74LVC257A is the logic implementation of a 4-pole, 2-position switch, where the position of
the switch is determined by the logic levels applied to S. The outputs are forced to a high impedance
OFF-state when OE is HIGH.
9.6.3.
Pin Description
PIN NUMBER
SYMBOL
1
S
2, 5, 11, 14
1|
to 4|
0
3, 6, 10, 13
1|
to 4|
1
4,7,9,12
1Y to 4Y
8
GND
15
OE
16
V
cc
74LVC14A
9.7.
9.7.1.
Features
• Wide supply voltage range of 1.2 to 3.6 V
• In accordance with JEDEC standard no. 8-1A
• Inputs accept voltages up to 5.5 V
• CMOS low power consumption
• Direct interface with TTL levels
9.7.2.
Applications
• Wave and pulse shapers for highly noisy environments
• Astable multivibrators
• Monostable multivibrators
9.7.3.
Description
The 74LVC14A is a high-performance, low power, low-voltage Si-gate CMOS device and superior to
most advanced CMOS compatible TTL families.
Inputs can be driven from either 3.3 V or 5 V devices. This feature allows the use of these devices as
translators in a mixed 3.3 V/5 V environment.
The 74LVC14A provides six inverting buffers with Schmitt-trigger action. It is capable of transforming
slowly changing input signals into sharply defined, jitter-free output signals.
Plasma TV Service Manual
DESCRIPTION
Common data select input
Data inputs from source 0
0
Data outputs from source 1
1
3-State multiplexer outputs
Ground (0V)
3-State output enable input (active LOW)
Positive supply voltage
7
11/01/2005
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