Enhanced N channel FET with no inherent diode to Vcc
5Ω bidirectional switches connect inputs to outputs
Ω
Zero propagation delay, zero ground bounce
TTL-compatible input and output levels
Undershoot clamp diodes on all switch and control inputs
Available in SSOP and TSSOP packages
DESCRIPTION:
APPLICATIONS:
•
•
•
•
•
•
•
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Logic replacement (data processing)
Power conservation
Capacitance reduction and isolation
Bus isolation
Clock gating
The QS316211 provides a set of 24 high-speed CMOS TTL-compatible
bus switches. The low ON resistance of the QS316211 allows inputs to be
connected to outputs without adding propagation delay and without gener-
ating additional ground bounce noise. The device operates as a 24-bit bus
switch. When
1OE
is low, 1An is connected to 1Bn. When
2OE
is low, 2An
is connected to 2Bn.
The QS316211 is ideal for switching wide digital buses, 5V to 3.3V
translation, and for hot plug buffering.
The QS316211 is characterized for operation at -40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
1
A
1
1
B
1
1
A
12
1
B
12
1
OE
2
A
1
2
B
1
2
A
12
2
B
12
2
OE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
NOVEMBER 1999
DSC-5570/2
IDTQS316211
HIGH-SPEED CMOS 24-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC
1
A
1
1
A
2
1
A
3
1
A
4
1
A
5
1
A
6
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Supply Voltage to Ground
DC Switch Voltage V
S
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤20ns)
DC Output Current
Maximum Power Dissipation (T
A
= 85°C)
Storage Temperature
Max
–0.5 to +7
–0.5 to +7
–0.5 to +7
–3
120
0.93
–65 to +150
Unit
V
V
V
V
mA
W
°C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
1
OE
2
OE
1
B
1
1
B
2
1
B
3
1
B
4
1
B
5
V
TERM
(2)
V
TERM
(3)
V
TERM
(3)
V
AC
I
OUT
P
MAX
T
STG
GND
1
A
7
1
A
8
1
A
9
1
A
10
1
A
11
1
A
12
2
A
1
2
A
2
GND
1
B
6
1
B
7
1
B
8
1
B
9
1
B
10
1
B
11
1
B
12
2
B
1
2
B
2
2
B
3
NOTES:
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. V
CC
terminals.
3. All terminals except V
CC
.
CAPACITANCE
(T
A
= +25°C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V)
Pins
Control Inputs
Quickswitch Channels (Switch OFF)
Typ.
4.5
5.5
Max.
(1)
6
7
Unit
pF
pF
NOTE:
1. This parameter is guaranteed but not production tested.
V
CC
2
A
3
PIN DESCRIPTION
Pin Names
xA
1
- xA
12
xB
1
- xB
12
1OE
-
2OE
I/O
I/O
I/O
I
Bus A
Bus B
Data Select
Description
GND
2
A
4
2
A
5
2
A
6
2
A
7
2
A
8
2
A
9
2
A
10
2
A
11
2
A
12
GND
2
B
4
2
B
5
2
B
6
2
B
7
2
B
8
2
B
9
2
B
10
2
B
11
2
B
12
FUNCTION TABLE
(1)
1OE
L
L
H
H
2OE
L
H
L
H
xA
1
Bx
1
Bx
xY
2
Bx
1
Ax
1
Ax
2
Ax
Function
to
1
Bx,
2
Ax to
2
Bx
to
1
Bx
to
2
Bx
Z
2
Bx
Z
Z
Z
Disconnect
SSOP/ TSSOP
TOP VIEW
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
2
IDTQS316211
HIGH-SPEED CMOS 24-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
CC
= 5V ± 10%
Symbol
V
IH
V
IL
I
IN
I
OZ
R
ON
V
P
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Leakage Current (Control Inputs)
Off-State Current (Hi-Z)
Switch ON Resistance
(2)
Pass Voltage
(3)
Test Conditions
Guaranteed Logic HIGH for Control Inputs
Guaranteed Logic LOW for Control Inputs
0V
≤
V
IN
≤
V
CC
0V
≤
V
OUT
≤
V
CC
, Switches OFF
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
V
IN
= V
CC
= 5V, I
OUT
= -5µA
Min.
2
—
—
—
—
—
3.7
Typ.
(1)
Max.
—
—
0.01
0.01
5
10
4
—
0.8
±1
±1
7
12
4.2
V
Unit
V
V
µA
µA
Ω
NOTES:
1. Typical values are at V
CC
= 5V and T
A
= 25°C.
2. R
ON
is guaranteed but not production tested.
3. Pass voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
16
R
ON
(ohms)
14
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
V
IN
(Volts)
2.0
2.5
3.0
3.5
3
IDTQS316211
HIGH-SPEED CMOS 24-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current per Control Input HIGH
(2)
Dynamic Power Supply Current per MHz
(3)
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
V
CC
= Max., V
IN
= 3.4V, f = 0
V
CC
= Max., A and B Pins Open, Control Inputs Toggling @ 50% Duty Cycle
Max.
3
2.5
0.25
Unit
µA
mA
mA/MHz
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TTL-driven input (V
IN
= 3.4V). A and B pins do not contribute to
∆Icc.
3. This current applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The A and B inputs generate no significant
AC or DC currents as they transition. This parameter is guaranteed but not production tested.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C, V
CC
= 5V ± 10%
C
LOAD
= 50pF, R
LOAD
= 500Ω unless otherwise noted.
Symbol
t
PLH
t
PHL
t
PZL
t
PZH
t
PLZ
t
PHZ
Parameter
Data Propagation Delay
(2)
xAx to xBx, xBx to xAx
Switch Turn-On Delay
xOE
to xAx, xBx
Switch Turn-Off Delay
(2)
xOE
to xAx, xBx
Min
.
(1)
1.5
1.5
Typ.
Max.
0.25
(3)
6.5
6.2
Unit
ns
ns
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 at C
L
= 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
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