SN74LVC257A-Q1
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
www.ti.com
SCAS709B – SEPTEMBER 2003 – REVISED FEBRUARY 2008
FEATURES
1
•
•
•
•
•
•
•
Qualified for Automotive Applications
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Operates From 2 V to 3.6 V
Inputs Accept Voltages to 5.5 V
Max tpd of 4.6 ns at 3.3 V
Typical VOLP (Output Ground Bounce) < 0.8 V
at VCC = 3.3 V, TA = 25°C
Typical VOHV (Output VOH Undershoot) > 2 V
at VCC = 3.3 V, TA = 25°C
D OR PW PACKAGE
(TOP VIEW)
A/B
1A
1B
1Y
2A
2B
2Y
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
OE
4A
4B
4Y
3A
3B
3Y
DESCRIPTION/ORDERING INFORMATION
The SN74LVC257A quadruple 2-line to 1-line data selector/multiplexer is designed for 2.7-V to 3.6-V VCC
operation.
The device is designed to multiplex signals from 4-bit data sources to 4-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.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
ORDERING INFORMATION (1)
PACKAGE (2)
TA
–40°C to 125°C
(1)
(2)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
SOIC – D
Reel of 2500
SN74LVC257AQDRQ1
L257AQ1
TSSOP – PW
Reel of 2000
SN74LVC257AQPWRQ1
L257AQ1
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
FUNCTION TABLE
INPUTS
OE
A/B
A
B
OUTPUT
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
1
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2008, Texas Instruments Incorporated
SN74LVC257A-Q1
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
www.ti.com
SCAS709B – SEPTEMBER 2003 – REVISED FEBRUARY 2008
LOGIC DIAGRAM (POSITIVE LOGIC)
OE
A/B
1A
1B
2A
2B
3A
3B
4A
4B
15
1
2
4
1Y
3
5
7
2Y
6
11
9
3Y
10
14
12
4Y
13
Absolute Maximum Ratings (1)
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
UNIT
VCC
Supply voltage range
–0.5
6.5
V
VI
Input voltage range (2)
–0.5
6.5
V
VO
Output voltage range (2) (3)
–0.5
VCC + 0.5
IIK
Input clamp current
VI < 0
–50
mA
IOK
Output clamp current
VO < 0
–50
mA
IO
Continuous output current
±50
mA
±100
mA
Continuous current through VCC or GND
θJA
Package thermal impedance (4)
Tstg
Storage temperature range
(1)
(2)
(3)
(4)
2
D package
73
PW package
108
–65
150
V
°C/W
°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.
The input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
The value of VCC is provided in the recommended operating conditions table.
The package thermal impedance is calculated in accordance with JESD 51-7.
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Copyright © 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): SN74LVC257A-Q1
SN74LVC257A-Q1
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
www.ti.com
SCAS709B – SEPTEMBER 2003 – REVISED FEBRUARY 2008
Recommended Operating Conditions (1)
Operating
MIN
MAX
2
3.6
UNIT
VCC
Supply voltage
VIH
High-level input voltage
VCC = 2.7 V to 3.6 V
VIL
Low-level input voltage
VCC = 2.7 V to 3.6 V
0.8
V
VI
Input voltage
0
5.5
V
VO
Output voltage
0
VCC
V
IOH
High-level output current
IOL
Low-level output current
Δt/Δv
Input transition rise or fall rate
TA
Operating free-air temperature
(1)
Data retention only
1.5
2
V
V
VCC = 2.7 V
–12
VCC = 3 V
–24
VCC = 2.7 V
12
VCC = 3 V
24
–40
mA
mA
10
ns/V
125
°C
All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
IOH = –100 µA
VOH
VOL
MIN
2.7 V to 3.6 V
TYP (1) MAX
2.2
3V
2.4
IOH = –24 mA
3V
2.2
IOL = 100 µA
2.7 V to 3.6 V
0.2
IOL = 12 mA
2.7 V
0.4
3V
0.55
IOH = –12 mA
UNIT
VCC – 0.2
2.7 V
IOL = 24 mA
V
V
II
VI = 5.5 V or GND
3.6 V
±5
µA
IOZ
VO = VCC or GND
3.6 V
±15
µA
ICC
VI = VCC or GND,
3.6 V
10
µA
500
µA
ΔICC
(1)
VCC
IO = 0
One input at VCC – 0.6 V, Other inputs at VCC or GND
2.7 V to 3.6 V
Ci
VI = VCC or GND
3.3 V
5
pF
Co
VO = VCC or GND
3.3 V
5
pF
All typical values are at VCC = 3.3 V, TA = 25°C.
Copyright © 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): SN74LVC257A-Q1
Submit Documentation Feedback
3
SN74LVC257A-Q1
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
www.ti.com
SCAS709B – SEPTEMBER 2003 – REVISED FEBRUARY 2008
Switching Characteristics
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 1)
FROM
(INPUT)
PARAMETER
A or B
tpd
A/B
VCC = 2.7 V
TO
(OUTPUT)
VCC = 3.3 V
± 0.3 V
MIN MAX
MIN
MAX
5.4
1
4.6
7.5
1
6.4
Y
UNIT
ns
ten
OE
Y
6.7
1
5.6
ns
tdis
OE
Y
4.7
0.5
4.3
ns
1
ns
tsk(o)
Operating Characteristics
TA = 25°C
PARAMETER
Cpd
4
Power dissipation capacitance
TEST
CONDITIONS
VCC = 2.5 V
VCC = 3.3 V
TYP
TYP
f = 10 MHz
14.5
15.5
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UNIT
pF
Copyright © 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): SN74LVC257A-Q1
SN74LVC257A-Q1
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
www.ti.com
SCAS709B – SEPTEMBER 2003 – REVISED FEBRUARY 2008
PARAMETER MEASUREMENT INFORMATION
VLOAD
S1
RL
From Output
Under Test
CL
(see Note A)
Open
GND
RL
TEST
S1
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
VLOAD
GND
LOAD CIRCUIT
INPUTS
VCC
2.7 V
3.3 V ± 0.3 V
VI
tr/tf
2.7 V
2.7 V
≤2.5 ns
≤2.5 ns
VM
VLOAD
CL
RL
V∆
1.5 V
1.5 V
6V
6V
50 pF
50 pF
500 Ω
500 Ω
0.3 V
0.3 V
VI
Timing Input
VM
0V
tw
tsu
VI
Input
VM
VM
th
VI
Data Input
VM
VM
0V
0V
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VI
VM
Input
VM
0V
tPLH
VM
VM
VOL
tPHL
VM
VM
0V
tPLZ
Output
Waveform 1
S1 at VLOAD
(see Note B)
tPLH
VLOAD/2
VM
tPZH
VOH
Output
VM
tPZL
tPHL
VOH
Output
VI
Output
Control
VM
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VOL + V∆
VOL
tPHZ
Output
Waveform 2
S1 at GND
(see Note B)
VM
VOH - V∆
VOH
≈0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
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 ≤ 10 MHz, ZO = 50 Ω.
D. The outputs are measured one at a time, with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
H. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
Copyright © 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): SN74LVC257A-Q1
Submit Documentation Feedback
5
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
CLVC257AQPWRG4Q1
ACTIVE
TSSOP
PW
16
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
L257AQ1
SN74LVC257AQDRG4Q1
ACTIVE
SOIC
D
16
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
L257AQ1
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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