74F257A Philips, 74F257A Datasheet - Page 2

• Manufacturer Part Number: 74F257A
• Description: Quad 2-line to 1-line selector/multiplexer / non-inverting 3-State
• Manufacturer: Philips

One (1.0) FAST unit load is defined as: 20 A in the High state and 0.6mA in the Low state.
FEATURES
DESCRIPTION
The 74F257A has four identical 2-input multiplexers with 3-State
outputs which select 4 bits of data from two sources uncer control of
a common Select (S) input. The I0a inputs are selected when the
common Select input is Low and the I1n inputs are selected when
the common Select input is High. Data appears at the outputs in true
non-inverted form from the selected inputs. The 74F257A is the logic
implementation of a 4-pole, 2-position switch where the position of
the switch is determined by the logic levels supplied to the common
Slect input. Outputs are forced to a high impedance “off” state when
the Output Enable (OE) is High. All but one device must be in high
impedance state to avoid currents that would exceed the maximum
rating if the outputs were tied together. Design of the Output Enable
signals must ensure that there is no overlap when outputs of 3-state
devices were tied together.
ORDERING INFORMATION
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
NOTE:
LOGIC SYMBOL
Philips Semiconductors
1995 Mar 31
Industrial range available (–40 C to +85 C)
Multifunction capability
Non-inverting data path
3-State outputs
See 74F258A for inverting version
Quad 2-line to 1-line selector/multiplexer, non-inverting
(3-State)
V
GND = Pin 8
16-pin plastic DIP
CC
16-pin plastic SO
DESCRIPTION
15
= Pin 16
1
Ya – Yd
I0n, I1n
PINS
OE
S
S
OE
I0a I1a I0b I1b I0c I1c I0d
2
3
Ya
4
5
V
DESCRIPTION
Data inputs
Common Select input
Output Enable input (active Low)
Data outputs
CC
Yb
7
6
= 5V 10%, T
COMMERCIAL RANGE
11
Yc
9
10
Yd
12
N74F257AN
N74F257AD
14
SF00674
amb
I1d
13
= 0 C to +70 C
ORDER CODE
2
PIN CONFIGURATION
LOGIC SYMBOL (IEEE/IEC)
V
CC
74F257A
TYPE
= 5V 10%, T
74F (U.L.) HIGH/LOW
INDUSTRIAL RANGE
1.0/1.0
1.0/1.0
1.0/1.0
150/33
PROPAGATION DELAY
I74F257AN
I74F257AD
15
1
2
3
5
6
10
11
13
14
amb
GND
I0a
I1a
I0b
I1b
Yb
Ya
S
TYPICAL
= –40 C to +85 C
4.3ns
1
2
3
4
5
6
7
8
EN
G1
1
1
MUX
LOAD VALUE HIGH/LOW
SF00673
16
15
14
13
12
10
11
9
3.0mA/20mA
SUPPLY CURRENT
20 A/0.6mA
20 A/0.6mA
20 A/0.6mA
SF00675
V
OE
I0d
I1d
Yd
I0c
I1c
Yc
Product specification
CC
74F257A
12
TYPICAL
853–0360 15059
(TOTAL)
DRAWING
DRAWING
4
7
9
SOT109-1
NUMBER
SOT38-4
12mA