74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B JANUARY 1989 REVISED APRIL 1996
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Inputs Are TTL-Voltage Compatible
D
3-State Outputs Interface Directly With
System Bus
D
Flow-Through Architecture Optimizes
PCB Layout
D
Center-Pin V
CC
and GND Configurations
Minimize High-Speed Switching Noise
D
EPIC
t
(Enhanced-Performance Implanted
CMOS) 1-
m
m Process
D
500-mA Typical Latch-Up Immunity at
125
C
D
Provides Bus Interface From Multiple
Sources in High-Performance Systems
D
Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, and Standard
Plastic 300-mil DIPs (N)
description
The 74ACT11257 is designed to multiplex signals from 4-bit data sources to four output data lines in
bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at
a high logic level.
The 74ACT11257 is characterized for operation from 40
C to 85
C.
FUNCTION TABLE
INPUTS
OUTPUT
OE
SELECT
DATA
OUTPUT
Y
OE
A/B
A
B
Y
H
X
X
X
Z
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
Copyright
1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
A /B
1Y
2Y
GND
GND
GND
GND
3Y
4Y
OE
1A
1B
2A
2B
V
CC
V
CC
3A
3B
4A
4B
DB, DW, OR N PACKAGE
(TOP VIEW)
74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B JANUARY 1989 REVISED APRIL 1996
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic symbol
4B
4A
3B
3A
2B
2A
1B
1A
A / B
OE
11
12
13
14
17
18
19
20
1
10
G1
EN
1
1
4Y
3Y
2Y
1Y
9
8
3
2
MUX
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
4B
4A
3B
3A
2B
2A
1B
1A
A / B
OE
11
12
13
14
17
18
19
20
1
10
4Y
3Y
2Y
1Y
9
8
3
2
74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B JANUARY 1989 REVISED APRIL 1996
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(see Note 1)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
(see Note 1)
0.5 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
(V
O
= 0 to V
CC
)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
or GND
100 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at T
A
= 55
C (in still air) (see Note 2): DB package
0.6 W
. . . . . . . . . . . . . . . . . . .
DW package
1.6 W
. . . . . . . . . . . . . . . . . .
N package
1.3 W
. . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The maximum package power dissipation is calculated using a junction temperature of 150
_
C and a board trace length of 750 mils,
except for the N package, which has a trace length of zero.
recommended operating conditions
MIN
MAX
UNIT
VCC
Supply voltage
4.5
5.5
V
VIH
High-level input voltage
2
V
VIL
Low-level input voltage
0.8
V
VI
Input voltage
0
VCC
V
VO
Output voltage
0
VCC
V
IOH
High-level output current
24
mA
IOL
Low-level output current
24
mA
D
t/
D
v
Input transition rise or fall rate
0
10
ns/V
TA
Operating free-air temperature
40
85
C
74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B JANUARY 1989 REVISED APRIL 1996
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETERS
TEST CONDITIONS
VCC
TA = 25
C
MIN
MAX
UNIT
PARAMETERS
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
MAX
UNIT
IOH = 50
m
A
4.5 V
4.4
4.4
IOH = 50
m
A
5.5 V
5.4
5.4
VOH
IOH = 24 mA
4.5 V
3.94
3.8
V
OH
IOH = 24 mA
5.5 V
4.94
4.8
IOH = 75 mA
{
5.5 V
3.85
IOL = 50
m
A
4.5 V
0.1
0.1
IOL = 50
m
A
5.5 V
0.1
0.1
VOL
IOL = 24 mA
4.5 V
0.36
0.44
V
OL
IOL = 24 mA
5.5 V
0.36
0.44
IOL = 75 mA
{
5.5 V
1.65
IOZ
VO = VCC or GND
5.5 V
0.5
5
m
A
II
VI = VCC or GND
5.5 V
0.1
1
m
A
ICC
VI = VCC or GND,
IO = 0
5.5 V
8
80
m
A
D
ICC
One input at 3.4 V,
Other inputs at VCC or GND
5.5 V
0.9
1
mA
Ci
VI = VCC or GND
5 V
3.5
pF
Co
VO = VCC or GND
5 V
8
pF
Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V to VCC.
switching characteristics over recomended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
TA = 25
C
MIN
MAX
UNIT
PARAMETER
(INPUT)
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
UNIT
tPLH
A or B
Y
1.5
4.4
6.4
1.5
6.9
ns
tPHL
A or B
Y
1.5
5
8
1.5
8.7
ns
tPLH
A /B
Any Y
1.5
4.7
7.6
1.5
8.2
ns
tPHL
A /B
Any Y
1.5
5.7
8.5
1.5
9.4
ns
tPZH
OE
Any Y
1.5
4.2
6.9
1.5
7.3
ns
tPZL
OE
Any Y
1.5
5.5
8.7
1.5
9.6
ns
tPHZ
OE
Any Y
1.5
5.7
7.6
1.5
8.4
ns
tPLZ
OE
Any Y
1.5
6
7.9
1.5
8.5
ns
operating characteristics, V
CC
= 5 V, T
A
= 25
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
C d
Power dissipation capacitance
Outputs enabled
CL = 50 pF
f = 1 MHz
41
pF
Cpd
Power dissipation capacitance
Outputs disabled
CL = 50 pF,
f = 1 MHz
13
pF
74ACT11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS053B JANUARY 1989 REVISED APRIL 1996
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
50% VCC
tPLH
tPHL
tPHL
tPLH
VOH
VOH
VOL
VOL
1.5 V
1.5 V
3 V
0 V
50% VCC
50% VCC
Input
Out-of-Phase
Output
In-Phase
Output
50% VCC
VOLTAGE WAVEFORMS
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
S1
2
VCC
500
500
Output
Control
(low-level
enabling)
Output
Waveform 1
S1 at 2
VCC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
VOL
VOH
tPZL
tPZH
tPLZ
tPHZ
1.5 V
1.5 V
[
VCC
0 V
50% VCC
20% VCC
50% VCC
80% VCC
[
0 V
3 V
GND
Open
VOLTAGE WAVEFORMS
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2
VCC
GND
TEST
S1
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR
1 MHz, ZO = 50
, tr = 3 ns, tf = 3 ns.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
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