TI SN74CB3T3257PWR

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SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
•
•
•
FEATURES
•
•
•
•
•
•
•
Output Voltage Translation Tracks VCC
Supports Mixed-Mode Signal Operation on All
Data I/O Ports
– 5-V Input Down to 3.3-V Output Level Shift
With 3.3-V VCC
– 5-V/3.3-V Input Down to 2.5-V Output Level
Shift With 2.5-V VCC
5-V-Tolerant I/Os With Device Powered Up or
Powered Down
Bidirectional Data Flow With Near-Zero
Propagation Delay
Low ON-State Resistance (ron) Characteristics
(ron = 5 Ω Typ)
Low Input/Output Capacitance Minimizes
Loading (Cio(OFF) = 5 pF Typ)
Data and Control Inputs Provide Undershoot
Clamp Diodes
•
•
•
•
•
•
Low Power Consumption (ICC = 20 µA Max)
VCC Operating Range From 2.3 V to 3.6 V
Data I/Os Support 0- to 5-V Signaling Levels
(0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V)
Control Inputs Can Be Driven by TTL or
5-V/3.3-V CMOS Outputs
Ioff Supports Partial-Power-Down Mode
Operation
Latch-Up Performance Exceeds 250 mA Per
JESD 17
ESD Performance Tested Per JESD 22
– 2000-V Human-Body Model
(A114-B, Class II)
– 1000-V Charged-Device Model (C101)
Supports Digital Applications: Level
Translation, USB Interface, Memory
Interleaving, Bus Isolation
Ideal for Low-Power Portable Equipment
DGV OR PW PACKAGE
(TOP VIEW)
S
1B1
1B2
1A
2B1
2B2
2A
GND
1
16
2
15
3
14
4
13
5
12
6
7
11
10
8
9
VCC
OE
4B1
4B2
4A
3B1
3B2
3A
DESCRIPTION/ORDERING INFORMATION
The SN74CB3T3257 is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state resistance
(ron), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data
I/O ports by providing voltage translation that tracks VCC. The SN74CB3T3257 supports systems using 5-V TTL,
3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Figure 1).
ORDERING INFORMATION
PACKAGE (1)
TA
–40°C to 85°C
TSSOP – PW
TVSOP – DGV
(1)
ORDERABLE PART NUMBER
Tube
SN74CB3T3257PW
Tape and reel
SN74CB3T3257PWR
Tape and reel
SN74CB3T3257DGVR
TOP-SIDE MARKING
KS257
KS257
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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 © 2003–2005, Texas Instruments Incorporated
SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
www.ti.com
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
The SN74CB3T3257 is a 4-bit 1-of-2 multiplexer/demultiplexer with a single output-enable (OE) input. The select
(S) input controls the data path of the multiplexer/demultiplexer. When OE is low, the multiplexer/demultiplexer is
enabled, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is
high, the multiplexer/demultiplexer is disabled, and a high-impedance state exists between the A and B ports.
This device is fully specified for partial-power-down applications using Ioff. The Ioff feature ensures that damaging
current will not backflow through the device when it is powered down. The device has isolation during power off.
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.
FUNCTION TABLE
(EACH MULTIPLEXER/DEMULTIPLEXER)
INPUTS
S
INPUT/OUTPUT
A
FUNCTION
L
L
B1
A port = B1 port
L
H
B2
A port = B2 port
H
X
Z
Disconnect
OE
VCC
5.5 V
VCC
IN
≈VCC – 1 V
≈VCC
OUT
≈VCC – 1 V
CB3T
0V
0V
Input Voltages
Output Voltages
NOTE A: If the input high voltage (VIH) level is greater than or equal to VCC – 1 V, and less than or equal to 5.5 V, then the output high voltage
(VOH) level will be equal to approximately the VCC voltage level.
Figure 1. Typical DC Voltage Translation Characteristics
2
www.ti.com
SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
LOGIC DIAGRAM (POSITIVE LOGIC)
4
1A
2
1B1
SW
3
1B2
SW
7
2A
5
2B1
SW
6
2B2
SW
3A
9
11
SW
3B1
10
SW
12
4A
3B2
14
4B1
SW
13
SW
4B2
1
S
15
OE
SIMPLIFIED SCHEMATIC, EACH FET SWITCH (SW)
A
B
VG(1)
Control
Circuit
EN(2)
(1) Gate voltage (VG) is equal to approximately VCC + VT when the switch is ON
and VI > VCC + VT.
(2) EN is the internal enable signal applied to the switch.
3
SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
www.ti.com
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
Absolute Maximum Ratings (1)
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
VCC
Supply voltage range
–0.5
7
V
VIN
Control input voltage range (2) (3)
–0.5
7
V
VI/O
Switch I/O voltage
range (2) (3) (4)
IIK
Control input clamp current
VIN < 0
–50
mA
II/OK
I/O port clamp current
VI/O < 0
–50
mA
±128
mA
±100
mA
IIO
ON-state switch
–0.5
7
current (5)
Continuous current through VCC or GND
θJA
Package thermal impedance (6)
Tstg
Storage temperature range
(1)
(2)
(3)
(4)
(5)
(6)
UNIT
DGV package
120
PW package
108
–65
V
°C/W
°C
150
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.
All voltages are with respect to ground, unless otherwise specified.
The input and output voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
VI and VO are used to denote specific conditions for VI/O.
II and IO are used to denote specific conditions for II/O.
The package thermal impedance is calculated in accordance with JESD 51-7.
Recommended Operating Conditions (1)
VCC
Supply voltage
VIH
High-level control input voltage
VIL
Low-level control input voltage
VI/O
Data input/output voltage
TA
Operating free-air temperature
(1)
4
MIN
MAX
UNIT
2.3
3.6
VCC = 2.3 V to 2.7 V
1.7
5.5
V
VCC = 2.7 V to 3.6 V
2
5.5
VCC = 2.3 V to 2.7 V
0
0.7
VCC = 2.7 V to 3.6 V
0
0.8
0
5.5
V
–40
85
°C
V
V
All unused control 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.
www.ti.com
SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
Electrical Characteristics
(1)
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VIK
VCC = 3 V, II = –18 mA
VOH
See Figures 3 and 4
IIN
Control inputs
MIN
VCC = 3.6 V, VIN = 3.6 V to 5.5 V or GND
Ioff
VCC = 0, VO = 0 to 5.5 V, VI = 0
ICC
VCC = 3.6 V, II/O = 0,
Switch ON or OFF, VIN = VCC or GND
20
VCC = 3 V to 3.6 V, One input at VCC – 0.6 V, Other inputs at VCC or GND
VCC = 3.3 V, VIN = VCC or GND
ron (5)
(1)
(2)
(3)
(4)
(5)
µA
20
Control inputs
B port
µA
10
VI = 5.5 V
Control inputs
Cio(ON)
±10
VI = VCC or GND
Cin
300
3
µA
pF
5
VI/O = 5.5 V or 3.3 V
µA
pF
7
VCC = 3.3 V, VI/O = 5.5 V, 3.3 V, or GND, Switch OFF, VIN = VCC or GND
VCC = 3.3 V,
Switch ON,
VIN = VCC or GND
µA
±5
VI = 0 to 0.7 V
∆ICC (4)
A port
µA
–40
VCC = 3.6 V, VO = 0 to 5.5 V, VI = 0, Switch OFF, VIN = VCC or GND
B port
±10
VI = 0.7 V to VCC – 0.7 V
IOZ (3)
A port
V
±20
VCC = 3.6 V,
Switch ON,
VIN = VCC or GND
UNIT
–1.2
VI = VCC – 0.7 V to 5.5 V
II
Cio(OFF)
TYP (2) MAX
6
VI/O = GND
16
VI/O = 5.5 V or 3.3 V
pF
4
VI/O = GND
16
VCC = 2.3 V, TYP at VCC = 2.5 V,
VI = 0
IO = 24 mA
5
8
IO = 16 mA
5
8
VCC = 3 V,
VI = 0
IO = 64 mA
5
7
IO = 32 mA
5
7
Ω
VIN and IIN refer to control inputs. VI, VO, II, and IO refer to data pins.
All typical values are at VCC = 3.3 V (unless otherwise noted), TA = 25°C.
For I/O ports, the parameter IOZ includes the input leakage current.
This is the increase in supply current for each input that is at the specified TTL voltage level, rather than VCC or GND.
Measured by the voltage drop between A and B terminals at the indicated current through the switch. ON-state resistance is determined
by the lower of the voltages of the two (A or B) terminals.
Switching Characteristics
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 2)
VCC = 3.3 V
± 0.3 V
TO
(OUTPUT)
tpd (1)
A or B
B or A
0.25
ns
tpd(s)
S
A
1
9.5
1
7
ns
S
B
1
9
1
7.5
OE
A or B
1
9
1
7.5
S
B
1
7
1
7.5
OE
A or B
1
6
1
8
ten
tdis
(1)
VCC = 2.5 V
± 0.2 V
FROM
(INPUT)
PARAMETER
MIN
MAX
MIN
0.15
UNIT
MAX
ns
ns
The propagation delay is the calculated RC time constant of the typical ON-state resistance of the switch and the specified load
capacitance, when driven by an ideal voltage source (zero output impedance).
5
SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
www.ti.com
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
PARAMETER MEASUREMENT INFORMATION
VCC
Input Generator
VIN
50 Ω
50 Ω
VG1
TEST CIRCUIT
DUT
2 × VCC
Input Generator
S1
RL
VO
VI
50 Ω
50 Ω
VG2
CL
(see Note A)
RL
TEST
VCC
S1
RL
VI
CL
tpd(s)
2.5 V ± 0.2 V
3.3 V ± 0.3 V
Open
Open
500 Ω
500 Ω
3.6 V or GND
5.5 V or GND
30 pF
50 pF
tPLZ/tPZL
2.5 V ± 0.2 V
3.3 V ± 0.3 V
2 × VCC
2 × VCC
500 Ω
500 Ω
GND
GND
30 pF
50 pF
0.15 V
0.3 V
tPHZ/tPZH
2.5 V ± 0.2 V
3.3 V ± 0.3 V
Open
Open
500 Ω
500 Ω
3.6 V
5.5 V
30 pF
50 pF
0.15 V
0.3 V
V∆
VCC
Output
Control
(VIN)
VCC/2
VCC
VCC/2
VCC/2
0V
tPLH
VOH
Output
VCC/2
VCC/2
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES (tpd(s))
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
tPLZ
VCC
VCC/2
VOL + V∆
VOL
tPZH
tPHL
VCC/2
0V
tPZL
Output
Control
(VIN)
Open
GND
Output
Waveform 2
S1 at Open
(see Note B)
tPHZ
VOH
VCC/2
VOH − V∆
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
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, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
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(s). The tpd propagation delay is the calculated RC time constant of the typical ON-state resistance
of the switch and the specified load capacitance, when driven by an ideal voltage source (zero output impedance).
H. All parameters and waveforms are not applicable to all devices.
Figure 2. Test Circuit and Voltage Waveforms
6
SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
www.ti.com
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
3.0
4.0
VCC = 2.3 V
IO = 1 µA
TA = 25°C
V - Output Voltage - V
O
V - Output Voltage - V
O
4.0
2.0
1.0
0.0
0.0
1.0
2.0
3.0
4.0
VI - Input Voltage - V
5.0
6.0
3.0
VCC = 3 V
IO = 1 µA
TA = 25°C
2.0
1.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
VI - Input Voltage - V
Figure 3. Data Output Voltage vs Data Input Voltage
7
SN74CB3T3257
4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
SCDS149 – OCTOBER 2003 – REVISED MARCH 2005
www.ti.com
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE HIGH
vs
SUPPLY VOLTAGE
3.5
4.0
VCC = 2.3 V to 3.6 V
VI = 5.5 V
TA = 85°C
100 µA
8 mA
16 mA
24 mA
3.0
2.5
2.0
3.5
VCC = 2.3 V to 3.6 V
VI = 5.5 V
TA = 25°C
8 mA
16 mA
24 mA
3.0
2.5
2.0
2.5
2.7
2.9
3.1
3.3
VCC - Supply Voltage - V
3.5
3.7
2.3
2.5
2.7
2.9
3.1
3.3
VCC - Supply Voltage - V
OUTPUT VOLTAGE HIGH
vs
SUPPLY VOLTAGE
V
- Output Voltage High - V
OH
4.0
3.5
VCC = 2.3 V to 3.6 V
VI = 5.5 V
TA = -40°C
100 µA
8 mA
16 mA
24 mA
3.0
2.5
2.0
1.5
2.3
2.5
3.3
2.7
2.9
3.1
VCC - Supply Voltage - V
Figure 4. VOH Values
8
100 µA
1.5
1.5
2.3
V
- Output Voltage High - V
OH
V
- Output Voltage High - V
OH
4.0
OUTPUT VOLTAGE HIGH
vs
SUPPLY VOLTAGE
3.5
3.7
3.5
3.7
PACKAGE OPTION ADDENDUM
www.ti.com
30-Mar-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
SN74CB3T3257DGVR
ACTIVE
TVSOP
DGV
16
2000
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
SN74CB3T3257PW
ACTIVE
TSSOP
PW
16
90
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
SN74CB3T3257PWR
ACTIVE
TSSOP
PW
16
2000
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
Lead/Ball Finish
MSL Peak Temp (3)
(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)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
MECHANICAL DATA
MPDS006C – FEBRUARY 1996 – REVISED AUGUST 2000
DGV (R-PDSO-G**)
PLASTIC SMALL-OUTLINE
24 PINS SHOWN
0,40
0,23
0,13
24
13
0,07 M
0,16 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
0°–8°
1
0,75
0,50
12
A
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,08
14
16
20
24
38
48
56
A MAX
3,70
3,70
5,10
5,10
7,90
9,80
11,40
A MIN
3,50
3,50
4,90
4,90
7,70
9,60
11,20
DIM
4073251/E 08/00
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion, not to exceed 0,15 per side.
Falls within JEDEC: 24/48 Pins – MO-153
14/16/20/56 Pins – MO-194
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,30
0,19
0,65
14
0,10 M
8
0,15 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
1
7
0°– 8°
A
0,75
0,50
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,10
8
14
16
20
24
28
A MAX
3,10
5,10
5,10
6,60
7,90
9,80
A MIN
2,90
4,90
4,90
6,40
7,70
9,60
DIM
4040064/F 01/97
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion not to exceed 0,15.
Falls within JEDEC MO-153
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
www.ti.com/broadband
Interface
interface.ti.com
Digital Control
www.ti.com/digitalcontrol
Logic
logic.ti.com
Military
www.ti.com/military
Power Mgmt
power.ti.com
Optical Networking
www.ti.com/opticalnetwork
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
Telephony
www.ti.com/telephony
Video & Imaging
www.ti.com/video
Wireless
www.ti.com/wireless
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