IDTQS3251
HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH® PRODUCTS
HIGH-SPEED CMOS
QUICKSWITCH 8:1 MUX/DEMUX
FEATURES:
•
•
•
•
•
•
•
IDTQS3251
DESCRIPTION:
Enhanced N channel FET with no inherent diode to Vcc
Ω bidirectional switches connect inputs to outputs
5Ω
Pin compatible with the 74F251, 74FCT251, and 74FCT251T
Zero propagation delay, zero ground bounce
Undershoot clamp diodes on all switch and control inputs
TTL-compatible control inputs
Available in SOIC and QSOP packages
The QS3251 is a high-speed CMOS TTL-compatible 8:1 multiplexer/
demultiplexer. The QS3251 has 3-state outputs. The QS3251 is a function
and pinout compatible version of the 74F251, 74FCT251 and the 74ALS/
AS/LS251 8:1 multiplexers. The low ON resistance of the QS3251 allows
inputs to be connected to outputs without adding propagation delay and
without generating additional ground bounce noise.
Mux/Demux devices provide an order of magnitude faster speed than
equivalent logic devices.
The QS3251 is characterized for operation at -40°C to +85°C.
APPLICATIONS:
•
•
•
•
Logic replacement
Video, audio, graphics switching, muxing
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
FUNCTIONAL BLOCK DIAGRAM
S0
S1
S2
E
I0
I1
I2
I3
I4
I5
I6
I7
Y
INDUSTRIAL TEMPERATURE RANGE
c
2011 Integrated Device Technology, Inc.
FEBRUARY 2011
1
DSC-5754/5
IDTQS3251
HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Description
VTERM(2)
Max
Unit
VTERM(3)
Supply Voltage to Ground
–0.5 to +7
V
DC Switch Voltage Vs
–0.5 to +7
V
VTERM(3)
DC Input Voltage VIN
–0.5 to +7
V
VAC
AC Input Voltage (pulse width ≤ 20ns)
–3
V
mA
I3
1
16
VCC
I2
2
15
I4
IOUT
DC Output Current
120
PMAX
Maximum Power Dissipation (TA = 85°C)
0.5
W
I1
3
14
I5
TSTG
Storage Temperature
–65 to +150
°C
I0
4
13
I6
Y
5
12
I7
NC
6
11
S0
E
7
10
S1
8
9
S2
GND
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. Vcc terminals.
3. All terminals except Vcc.
CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V, VOUT = 0V)
Pins
Typ.
Max. (1)
Unit
Control Inputs
4
5
pF
5
21
7
23
pF
Quickswitch Channels
(Switch OFF)
SOIC/ QSOP
TOP VIEW
Demux
Mux
NOTE:
1. This parameter is guaranteed but not production tested.
FUNCTION TABLE(1)
PIN DESCRIPTION
Pin Names
I/O
I0 - I 7
I
Data Inputs
S0 - S2
I
Select Inputs
E
I
Enable Input
Y
O
Data Output
Select
Description
E
S2
S1
S0
Y
Function
H
X
X
X
Hi-Z
Disable
L
L
L
L
I0
S2 - S 0 = 0
L
L
L
H
I1
S2 - S 0 = 1
L
L
H
L
I2
S2 - S 0 = 2
L
L
H
H
I3
S2 - S 0 = 3
L
H
L
L
I4
S2 - S 0 = 4
L
H
L
H
I5
S2 - S 0 = 5
L
H
H
L
I6
S2 - S 0 = 6
L
H
H
H
I7
S2 - S 0 = 7
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedence
2
IDTQS3251
HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%
Symbol
Parameter
Test Conditions
Min.
Typ.(1)
Max.
Unit
2
—
—
V
VIH
Input HIGH Level
Guaranteed Logic HIGH for Control Pins
VIL
Input LOW Level
Guaranteed Logic LOW for Control Pins
—
—
0.8
V
IIN
Input LeakageCurrent (Control Inputs)
0V ≤ VIN ≤ VCC
—
—
±1
μA
IOZ
Off-State Output Current (Hi-Z)
0V ≤ VOUT ≤ VCC
—
—
±1
μA
RON
Switch ON Resistance(2)
Pass Voltage(3)
—
—
3.7
5
10
4
7
15
4.2
Ω
VP
VCC = Min., VIN = 0V, ION = 30mA
VCC = Min., VIN = 2.4V, ION =15mA
VIN = VCC = 5V, IOUT = -5μA
NOTES:
1. Typical values are at VCC = 5.0V, TA = 25°C.
2. RON is guaranteed but not production tested.
3. Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
R ON
(ohms)
16
14
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
V IN
(Volts)
3
2.5
3.0
3.5
V
IDTQS3251
HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
Test Conditions(1)
Parameter
Max.
Unit
ICCQ
Quiescent Power Supply Current
VCC = Max., VIN = GND or Vcc, f = 0
3
μA
ΔICC
Power Supply Current per Control Input HIGH (2)
VCC = Max., VIN = 3.4V, f = 0
1.5
mA
ICCD
Dynamic Power Supply Current per MHz(3)
VCC = Max., I and Y pins open
0.25
mA/MHz
Control Inputs Toggling at 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TLL driven input (VIN = 3.4V, control inputs only). I and Y pins do not contribute to ΔIcc.
3. This current applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The I and Y inputs generate no significant
AC or DC currents as they transition. This parameter is guaranteed but not production tested.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C, VCC = 5.0V ± 5%;
CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.
Symbol
Parameter
tPLH
Data Propagation Delay (2,3)
tPHL
Ix to Y
tPZL
Switch Turn-on Delay
tPZH
Sx to Y
tPZL
Switch Turn-on Delay
tPZH
E to Y
tPLZ
Switch Turn-off Delay (2)
tPHZ
E to Y, Sx to Y
Min. (1)
Typ.
Max.
Unit
—
—
0.25
ns
0.5
—
6.6
ns
0.5
—
6
ns
0.5
—
6
ns
NOTES:
1. Minimums are guaranteed but not production tested.
2. This parameter is guaranteed but not production tested.
3. The bus switch contributes no propagation delay other than the RC delay of the ON resistance of the switch and the load capacitance. The time constant for the switch alone
is of the order of 0.25ns for CL = 50pF. Since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very little propagation delay to
the system. Propagation delay of the bus switch, when used in a system, is determined by the driving circuit on the driving side of the switch and its interaction with the load
on the driven side.
4
IDTQS3251
HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
QS
XXXXX
Device Type
XX
Package
X
Blank
8
Tube or Tray
Tape and Reel
S1G
QG
Small Outline IC - Green
Quarter Size Outline Package - Green
3251
High Speed CMOS Quickswitch 8:1 Mux/Demux
Datasheet Document History
02/14/2011
Pg. 5
Updated the ordering information by removing the "IDT" notation, non RoHS part and by adding
Tape and Reel information.
5
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