!!! !
SCDS135A – SEPTEMBER 2003 − REVISED NOVEMBER 2003
D High-Bandwidth Data Path
D
D
D
D
D
† For additional information regarding the performance
characteristics of the CB3Q family, refer to the TI
application report, CBT-C, CB3T, and CB3Q
Signal-Switch Families, literature number SCDA008.
D
DBQ, 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
11
7
10
8
9
RGY PACKAGE
(TOP VIEW)
VCC
OE
4B1
4B2
4A
3B1
3B2
3A
1B1
1B2
1A
2B1
2B2
2A
VCC
D
D
1
16
15 OE
14 4B1
2
3
13 4B2
12 4A
4
5
11 3B1
10 3B2
6
7
8
9
3A
D
D
D
S
D
D
Undershoot Clamp Diodes
Low Power Consumption
(ICC = 0.7 mA Typical)
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 100 mA Per
JESD 78, Class II
ESD Performance Tested Per JESD 22
− 2000-V Human-Body Model
(A114-B, Class II)
− 1000-V Charged-Device Model (C101)
Supports Both Digital and Analog
Applications: USB Interface, Differential
Signal Interface, Bus Isolation,
Low-Distortion Signal Gating
GND
D
D Data and Control Inputs Provide
(Up to 500 MHz†)
5-V Tolerant I/Os with Device Powered-Up
or Powered-Down
Low and Flat ON-State Resistance (ron)
Characteristics Over Operating Range
(ron = 4 Ω Typical)
Rail-to-Rail Switching on Data I/O Ports
− 0- to 5-V Switching With 3.3-V VCC
− 0- to 3.3-V Switching With 2.5-V VCC
Bidirectional Data Flow, With Near-Zero
Propagation Delay
Low Input/Output Capacitance Minimizes
Loading and Signal Distortion
(Cio(OFF) = 3.5 pF Typical)
Fast Switching Frequency (fOE = 20 MHz
Max)
description/ordering information
ORDERING INFORMATION
−40°C to 85°C
ORDERABLE
PART NUMBER
PACKAGE‡
TA
TOP-SIDE
MARKING
QFN − RGY
Tape and reel
SN74CB3Q3257RGYR
BU257
SSOP (QSOP) − DBQ
Tape and reel
SN74CB3Q3257DBQR
BU257
TSSOP − PW
Tape and reel
SN74CB3Q3257PWR
BU257
TVSOP − DGV
Tape and reel
SN74CB3Q3257DGVR
BU257
‡ 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.
Copyright 2003, Texas Instruments Incorporated
"#$%&'()"%# "* +,&&-#) (* %$ .,/0"+()"%# 1()-
&%1,+)* +%#$%&' )% *.-+"$"+()"%#* .-& )2- )-&'* %$ -3(* #*)&,'-#)*
*)(#1(&1 4(&&(#)5 &%1,+)"%# .&%+-**"#6 1%-* #%) #-+-**(&"05 "#+0,1)-*)"#6 %$ (00 .(&('-)-&*
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1
!!! !
SCDS135A – SEPTEMBER 2003 − REVISED NOVEMBER 2003
description/ordering information (continued)
The SN74CB3Q3257 is a high-bandwidth FET bus switch utilizing a charge pump to elevate the gate voltage
of the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state resistance
allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The
device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data
bus. Specifically designed to support high-bandwidth applications, the SN74CB3Q3257 provides an optimized
interface solution ideally suited for broadband communications, networking, and data-intensive computing
systems.
The SN74CB3Q3257 is a 4-bit 1-of-2 high-speed FET 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 circuitry prevents damaging
current 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
INPUTS
2
OE
S
INPUT/OUTPUT
A
FUNCTION
L
L
B1
A port = B1 port
L
H
B2
A port = B2 port
H
X
Z
Disconnect
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!!! !
SCDS135A – SEPTEMBER 2003 − REVISED NOVEMBER 2003
logic diagram (positive logic)
4
2
1A
1B1
SW
3
1B2
SW
7
5
2A
2B1
SW
6
2B2
SW
9
3A
11
SW
3B1
10
3B2
SW
12
14
4A
4B1
SW
13
4B2
SW
1
S
15
OE
simplified schematic, each FET switch (SW)
A
B
VCC
Charge
Pump
EN†
† EN is the internal enable signal applied to the switch.
POST OFFICE BOX 655303
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3
!!! !
SCDS135A – SEPTEMBER 2003 − REVISED NOVEMBER 2003
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 4.6 V
Control input voltage range, VIN (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Switch I/O voltage range, VI/O (see Notes 1, 2, and 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Control input clamp current, IIK (VIN < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −50 mA
I/O port clamp current, II/OK (VI/O < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −50 mA
ON-state switch current, IIO (see Note 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±64 mA
Continuous current through VCC or GND terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 mA
Package thermal impedance, θJA (see Note 5): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W
(see Note 5): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82°C/W
(see Note 5): DBQ package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90°C/W
(see Note 5): DGV package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120°C/W
(see Note 5): PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108°C/W
(see Note 6): RGY package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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. All voltages are with respect to ground unless otherwise specified.
2. The input and output voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
3. VI and VO are used to denote specific conditions for VI/O.
4. II and IO are used to denote specific conditions for II/O.
5. The package thermal impedance is calculated in accordance with JESD 51-7.
6. The package thermal impedance is calculated in accordance with JESD 51-5.
recommended operating conditions (see Note 7)
VCC
Supply voltage
VIH
High-level control input voltage
VCC = 2.3 V to 2.7 V
VCC = 2.7 V to 3.6 V
VIL
Low-level control input voltage
VCC = 2.3 V to 2.7 V
VCC = 2.7 V to 3.6 V
VI/O
TA
Data input/output voltage
Operating free-air temperature
MIN
MAX
UNIT
2.3
3.6
1.7
5.5
V
2
5.5
0
0.7
0
0.8
0
5.5
V
−40
85
°C
V
V
NOTE 7: 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.
4
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!!! !
SCDS135A – SEPTEMBER 2003 − REVISED NOVEMBER 2003
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
IIN
TEST CONDITIONS
MIN
VCC = 3.6 V,
VCC = 3.6 V,
II = −18 mA
VIN = 0 to 5.5 V
IOZ‡
VCC = 3.6 V,
VO = 0 to 5.5 V,
VI = 0,
Switch OFF,
VIN = VCC or GND
Ioff
VCC = 0,
VI = 0
ICC
VCC = 3.6 V,
VO = 0 to 5.5 V,
II/O = 0,
Switch ON or OFF,
Control inputs
VIN = VCC or GND
0.7
∆ICC§
Control inputs
ICCD¶
Per control
input
VCC = 3.6 V,
One input at 3 V,
VCC = 3.6 V, A and B ports open,
Control input switching at 50% duty cycle
Cin
Control inputs
VCC = 3.3 V,
A port
VCC = 3.3 V,
B port
VCC = 3.3 V,
Switch OFF,
VIN = VCC or GND,
VI/O = 5.5 V, 3.3 V, or 0
VCC = 3.3 V,
Switch ON,
VIN = VCC or GND,
VI/O = 5.5 V, 3.3 V, or 0
VCC = 2.3 V,
TYP at VCC = 2.5 V
VI = 0,
VI = 1.7 V,
VCC = 3 V
VI = 0,
VI = 2.4 V,
A port
Cio(ON)
B port
ron#
Other inputs at VCC or GND
MAX
UNIT
−1.8
V
±1
µA
±1
µA
1
µA
1.5
mA
30
µA
0.3
0.35
mA/
MHz
2.5
3.5
pF
5.5
7
pF
3.5
5
pF
10.5
13
10.5
13
IO = 30 mA
IO = −15 mA
4
8
4
9
IO = 30 mA
IO = −15 mA
4
6
4
8
VIN = 5.5 V, 3.3 V, or 0
Switch OFF,
VI/O = 5.5 V, 3.3 V, or 0
VIN = VCC or GND,
Cio(OFF)
TYP†
pF
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.
¶ This parameter specifies the dynamic power-supply current associated with the operating frequency of a single control input (see Figure 2).
# Measured by the voltage drop between the 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 3)
PARAMETER
fOE or fS||
tpdk
tpd(s)
ten
tdis
VCC = 2.5 V
± 0.2 V
VCC = 3.3 V
± 0.3 V
FROM
(INPUT)
TO
(OUTPUT)
OE or S
A or B
10
20
MHz
A or B
B or A
0.12
0.2
ns
S
A
1.5
6.5
1.5
5.5
ns
S
B
1.5
6.5
1.5
5.5
OE
A or B
1.5
6.5
1.5
5.5
MIN
MAX
MIN
UNIT
MAX
S
B
1
6
1
6
OE
A or B
1
6
1
6
ns
ns
|| Maximum switching frequency for control inputs (VO > VCC, VI = 5 V, RL ≥ 1 MΩ, CL = 0).
k 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).
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5
!!! !
SCDS135A – SEPTEMBER 2003 − REVISED NOVEMBER 2003
TYPICAL ron
vs
VI
16
VCC = 3.3 V
TA = 25°C ,
IO = −15 mA
ron – Resistance – W
14
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
VI − V
Figure 1. Typical ron vs VI, VCC = 3.3 V and IO = −15 mA
TYPICAL ICC
vs
CONTROL-INPUT SWITCHING FREQUENCY
12
VCC = 3.3 V
TA = 25°C
A and B Ports Open
ICC – mA
10
8
6
S Switching
OE Switching
4
2
0
0
2
4
6
8
10
12
14
16
OE or S Switching Frequency − MHz
Figure 2. Typical ICC vs OE or S Switching Frequency, VCC = 3.3 V
6
POST OFFICE BOX 655303
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18
20
!!! !
SCDS135A – SEPTEMBER 2003 − REVISED NOVEMBER 2003
PARAMETER MEASUREMENT INFORMATION
VCC
Input Generator
VIN
50 Ω
50 Ω
VG1
TEST CIRCUIT
DUT
Input Generator
VI
S1
RL
VO
50 Ω
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
VCC or GND
VCC 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
GND
GND
500 Ω
500 Ω
VCC
VCC
30 pF
50 pF
0.15 V
0.3 V
Output
Control
(VIN)
V∆
VCC
VCC/2
VCC
VCC/2
0V
tPLH
VOH
Output
VCC/2
Output
Waveform 1
S1 at 2 × VCC
(see Note B)
tPLZ
VCC
VCC/2
tPZH
tPHL
VCC/2
VOL
VCC/2
0V
tPZL
VCC/2
Open
GND
50 Ω
VG2
Output
Control
(VIN)
2 × VCC
Output
Waveform 2
S1 at GND
(see Note B)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOL + V∆
VOL
tPHZ
VCC/2
VOH − V∆
VOH
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 3. Load Circuit and Voltage Waveforms
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7
PACKAGE OPTION ADDENDUM
www.ti.com
25-Feb-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
Lead/Ball Finish
MSL Peak Temp (3)
SN74CB3Q3257DBQR
ACTIVE
SSOP/
QSOP
DBQ
16
2500
Pb-Free
(RoHS)
CU NIPDAU
Level-2-260C-1 YEAR/
Level-1-235C-UNLIM
SN74CB3Q3257DGVR
ACTIVE
TVSOP
DGV
16
2000
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
SN74CB3Q3257PW
ACTIVE
TSSOP
PW
16
90
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
SN74CB3Q3257PWR
ACTIVE
TSSOP
PW
16
2000
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
SN74CB3Q3257RGYR
ACTIVE
QFN
RGY
16
1000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1YEAR
(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 - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free).
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" and in addition, uses package materials that do not contain halogens,
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry 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
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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
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amplifier.ti.com
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www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
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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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