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74ALS258 Arkusz danych(PDF) 2 Page - NXP Semiconductors

Numer części 74ALS258
Szczegółowy opis  Data selector/multiplexer
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74ALS258 Arkusz danych(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
74ALS257
Quad 2-input data selector, non-inverting (3-State)
74ALS258
Quad 2-input data selector, inverting (3-State)
2
1991 Feb 08
853–1130 01670
DESCRIPTION
The 74ALS257 is a quad 2-input multiplexer which selects 4 bits of
data from one of two sources under the control of a common select
input (S). The output enable input (OE) is active when Low. When
OE is High, all of the outputs (Yn) are forced to a High impedance
state (3-State) regardless of all other input conditions.
Moving data from two registers to a common output bus is a typical
use of the 74ALS257. The state of the select input determines the
particular register from which data comes.
The device is the logic implementation of 4-pole, 2-position switch
where the position of the switch is determined by the logic levels
supplied to the select input. The 74ALS258 is similar but has
inverting outputs (Yn).
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS257
7.0ns
7mA
74ALS258
7.0ns
7mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
DRAWING
NUMBER
16-pin plastic DIP
74ALS257N, 74ALS258
SOT38-4
16-pin plastic SO
74ALS257D, 74ALS258D
SOT109-1
16-pin plastic SSOP
Type II
74ALS257DB, 74ALS258DB
SOT338-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
Ina, Inb, Inc, Ind
Data inputs
1.0/1.0
20
µA/0.1mA
S
Select input
1.0/1.0
20
µA/0.1mA
OE
Enable input
1.0/1.0
20
µA/0.1mA
Ya – Yd, Ya – Yd
Data outputs
20/240
0.4mA/24mA
NOTE:
One (1.0) ALS unit load is defined as: 20
µA in the High state and 0.1mA in the Low state.
PIN CONFIGURATION – 74ALS257
16
15
14
13
12
11
10
7
6
5
4
3
2
1
Yb
VCC
Yd
I0c
I1c
I1d
OE
I0d
S
I0a
I1b
I1a
Ya
I0b
9
8
GND
Yc
SF00673
PIN CONFIGURATION – 74ALS258
16
15
14
13
12
11
10
7
6
5
4
3
2
1
Yb
VCC
Yd
I0c
I1c
I1d
OE
I0d
S
I0a
I1b
I1a
Ya
I0b
9
8
GND
Yc
SC00079


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