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IDTQS316245
HIGH-SPEED CMOS QUICKSWITCH 16-BIT WIDEBUS
INDUSTRIAL TEMPERATURE RANGE
JANUARY 2000
2000 Integrated Device Technology, Inc.
DSC-5720/1
c
INDUSTRIAL TEMPERATURE RANGE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
APPLICATIONS:
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Bus switching, isolation
Power conservation, clock gating
Logic replacement
FUNCTIONAL BLOCK DIAGRAM
FEATURES:
Enhanced N channel FET with no inherent diode to Vcc
5
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
IDTQS316245
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS
QUICKSWITCH 16-BIT WIDEBUSTM
COMPATIBLE BUS SWITCH
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.
B
0
OE 1
A
0
B
1
A
1
B
2
A
2
B
3
A
3
B
4
A
4
B
5
A
5
B
6
A
6
B
7
A
7
B
8
A
8
B
9
A
9
B
10
A
10
B
11
A
11
B
12
A
12
B
13
A
13
B
14
A
14
B
15
A
15
OE 2
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS316245
HIGH-SPEED CMOS QUICKSWITCH 16-BIT WIDEBUS
PIN CONFIGURATION
SSOP
TOP VIEW
Symbol
Description
Max
Unit
V
TERM
(2)
Supply Voltage to Ground
0.5 to +7
V
V
TERM
(3)
DC Switch Voltage to Ground
0.5 to +7
V
V
TERM
(3)
DC Input Voltage V
IN
0.5 to +7
V
V
AC
AC Input Voltage (pulse width
20ns)
3
V
I
OUT
DC Output Current
120
mA
P
MAX
Maximum Power
0.5
W
T
STG
Storage Temperature
65 to +150
C
ABSOLUTE MAXIMUM RATINGS
(1)
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
.
Pin Names
I/O
Description
A x
I/O
Bus A
B x
I/O
Bus B
OEx
I
Bus Enable
PIN DESCRIPTION
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = High-Impedance
FUNCTION TABLE
(1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
NC
OE1
B1
B2
B3
B4
GND
B5
B6
GND
B7
B8
B9
B10
GND
B11
B12
B13
B14
GND
B15
Vcc
B0
Vcc
NC
A1
A2
A3
A4
GND
A5
A6
GND
A7
A8
A9
A10
GND
A11
A12
A13
A14
GND
A15
Vcc
A0
Vcc
OE2
Pins
Typ.
Max.
(1)
Unit
Control Inputs
3
5
pF
Quickswitch Channels (Switch OFF)
5
7
pF
CAPACITANCE
(T
A
= +25C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V)
NOTE:
1. This parameter is guaranteed but not production tested.
OEx
Ax
Function
L
B x
Connect
H
Z
Disconnect
3
IDTQS316245
HIGH-SPEED CMOS QUICKSWITCH 16-BIT WIDEBUS
INDUSTRIAL TEMPERATURE RANGE
Symbol
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH for Control Inputs
2
--
--
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW for Control Inputs
--
--
0.8
V
I
IN
Input Leakage Current (Control Inputs)
0V
V
IN
V
CC
--
--
1
A
I
OZ
Off-State Current (Hi-Z)
0V
V
OUT
V
CC,
Switches OFF
--
--
1
A
R
ON
Switch ON Resistance
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
--
5
7
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
--
10
12
V
P
Pass Voltage
(2)
V
IN
= V
CC
= 5V, I
OUT
= -5
A
3.7
4
4.2
V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 5V 10%
NOTES:
1. Typical values are at V
CC
= 5V and T
A
= 25C.
2. Pass voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
R
ON
(ohms)
V
IN
(Volts)
16
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
INDUSTRIAL TEMPERATURE RANGE
IDTQS316245
HIGH-SPEED CMOS QUICKSWITCH 16-BIT WIDEBUS
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.
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
3
A
I
CC
Power Supply Current per Control Input HIGH
(2)
V
CC
= Max., V
IN
= 3.4V, f = 0
1.5
mA
I
CCD
Dynamic Power Supply Current per MHz
(3)
V
CC
= Max., A and B Pins Open, Control Inputs Toggling @ 50% Duty Cycle
0.25
mA/MHz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40C to +85C, V
CC
= 5V 10%
C
LOAD
= 50pF, R
LOAD
= 500
unless otherwise noted.
Symbol
Parameter
Min
.
(1)
Typ.
Max.
Unit
t
PLH
Data Propagation Delay
(2)
0.25
(3)
ns
t
PHL
Ax to Bx, Bx to Ax
t
PZL
Switch Turn-On Delay
1.5
6.5
ns
t
PZH
OEx to Ax/Bx
t
PLZ
Switch Turn-Off Delay
(2)
1.5
5.5
ns
t
PHZ
OEx to Ax/Bx
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
the driven side.
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IDTQS316245
HIGH-SPEED CMOS QUICKSWITCH 16-BIT WIDEBUS
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
2975 Stender Way
800-345-7015 or 408-727-6116
logichelp@idt.com
Santa Clara, CA 95054
fax: 408-492-8674
(408) 654-6459
www.idt.com
IDTQS
XXXXX
XX
Package
Device Type
Blank
Industrial (-40C to +85C)
Shrink Small Outline Package
PV
316245
High Speed CMOS QuickSwitch 16-Bit WidebusTM
Compatible Bus Switch
X
Process
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