Enhanced N channel FET with no inherent diode to Vcc
Ω
5Ω bidirectional switches connect inputs to outputs
Pin compatible with FCT16245
Flowthrough pinout for easy layout
Zero propagation delay, zero ground bounce
TTL-compatible input and output levels
Undershoot clamp diodes on all switch and control inputs
Available in SSOP package
DESCRIPTION:
The QS316245 provides a set of 16 high-speed CMOS TTL-compatible
bus switches (two banks of 8 switches each) in a flow-thru pinout. The low
ON resistance of the QS316245 allows inputs to be connected to outputs
without adding propagation delay and without generating additional ground
bounce noise. The Output Enable (OEx) signal turns the switches on similar
to the
OEx
signal of the 74’245. The QS316245 is ideally suited for 5V to
3.3V translation, bus switching and isolation, and hot insertion.
QuickSwitch devices provide an order of magnitude faster speed than
conventional logic devices.
APPLICATIONS:
•
•
•
•
•
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Bus switching, isolation
Power conservation, clock gating
Logic replacement
FUNCTIONAL BLOCK DIAGRAM
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
OE 1
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
OE 2
B
8
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
B
9
B
10
B
11
B
12
B
13
B
14
B
15
INDUSTRIAL TEMPERATURE RANGE
1
c
2000 Integrated Device Technology, Inc.
JANUARY 2000
DSC-5720/1
IDTQS316245
HIGH-SPEED CMOS QUICKSWITCH 16-BIT WIDEBUS
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC
B0
B1
GND
B2
B3
Vcc
B4
B5
GND
B6
B7
B8
B9
GND
B10
B11
Vcc
B12
B13
GND
B14
B15
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SSOP
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Supply Voltage to Ground
DC Switch Voltage to Ground
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤20ns)
DC Output Current
Maximum Power
Storage Temperature
Max
–0.5 to +7
–0.5 to +7
–0.5 to +7
–3
120
0.5
–65 to +150
Unit
V
V
V
V
mA
W
°C
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
OE1
A0
A1
GND
A2
A3
Vcc
A4
A5
GND
A6
A7
A8
A9
GND
A10
A11
Vcc
A12
A13
GND
A14
A15
OE2
V
TERM
(2)
V
TERM
(3)
V
TERM
(3)
V
AC
I
OUT
P
MAX
T
STG
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.
3
5
Max.
(1)
5
7
Unit
pF
pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
Ax
Bx
OEx
I/O
I/O
I/O
I
Bus A
Bus B
Bus Enable
Description
FUNCTION TABLE
(1)
OEx
L
H
Ax
Bx
Z
Connect
Disconnect
Function
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = High-Impedance
2
IDTQS316245
HIGH-SPEED CMOS QUICKSWITCH 16-BIT WIDEBUS
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
Pass Voltage
(2)
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.
—
—
—
—
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. 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
2.0
2.5
3.0
3.5
V
IN
(Volts)
3
IDTQS316245
HIGH-SPEED CMOS QUICKSWITCH 16-BIT WIDEBUS
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
1.5
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)
Ax to Bx, Bx to Ax
Switch Turn-On Delay
OEx
to Ax/Bx
Switch Turn-Off Delay
(2)
OEx
to Ax/Bx
Min
.
(1)
1.5
1.5
Typ.
Max.
0.25
(3)
6.5
5.5
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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