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IDTQS34X245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES INDUSTRIAL TEMPERATURE RANGE
AUGUST 2012
2012 Integrated Device Technology, Inc. DSC-5481/5c
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FEATURES:
• Enhanced N channel FET with no inherent diode to Vcc
• Bidirectional switches connect inputs to outputs
• Zero propagation delay, zero ground bounce
• QS34X245 is 32-bit version of QS3245
• Flow-through pinout for easy layout
• Undershoot clamp diodes on all switch and control inputs
• TTL-compatible control inputs
• Available in 80-pin MilliPaQ™ package
APPLICATIONS:
• Hot-swapping, hot-docking
• Voltage translation (5V to 3.3V)
• Bus switching and isolation
• Power conservation
• Logic replacement (data processing)
• Capacitance isolation
• Clock gating
IDTQS34X245
QUICKSWITCH® PRODUCTS
HIGH-SPEED CMOS
QUICKSWITCH 32-BIT
MULTIWIDTH™ BUS SWITCHES
DESCRIPTION:
The QS34X245 is a member of the MultiWidthTM family of QuickSwitch
devices and provides a set of 32 high-speed CMOS compatible bus switches
in a flow-through pinout. This device is available in the MilliPaQ package,
the world's first small outline 32-bit solution. The low ON-resistance of the
QS34X245 allows inputs to be connected to outputs without adding propa-
gation delay and without generating additional ground bounce noise. When
Output Enable (OEn) is low, the switches are turned on, connecting bus A
to bus B. When OEn is high, the switches are turned off. This device is ideally
suited for 32/64 bit applications where board space is at a premium.
QuickSwitch devices provide speeds an order of magnitude faster than
conventional logic devices.
The QS34X245 is characterized for operation at -40°C to +85°C.
B0
OE1
A0
B1
A1
B2
A2
B
3
A3
B4
A4
B5
A5
B6
A6
B7
A7
B8
OE2
A8
B9
A9
B10
A10
B11
A11
B12
A12
B13
A13
B14
A
14
B15
A15
B16
OE3
A16
B17
A17
B18
A18
B19
A19
B20
A20
B21
A21
B22
A22
B23
A
23
B24
OE4
A
24
B25
A
25
B26
A
26
B27
A
27
B28
A
28
B29
A
29
B30
A
30
B31
A
31
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INDUSTRIAL TEMPERATURE RANGE
IDTQS34X245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES
PIN CONFIGURATION
CAPACITANCE
(TA = +25°C, f = 1.0MHZ, VIN = 0V, VOUT = 0V)
NOTE:
1. This parameter is measured at characterization but not tested.
Pins Typ. Max.(1) Unit
Control Pins 3 4 pF
Quickswitch Channels (Switch OFF) 7 8 pF
Symbol Description Max Unit
VTERM(2) Supply Voltage to Ground –0.5 to +7 V
VTERM(3) 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
IOUT DC Output Current 120 mA
PMAX Maximum Power Dissipation (TA =70°C) 1.4 W
TSTG Storage Temperature –65 to +150 °C
ABSOLUTE MAXIMUM RATINGS(1)
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.
MILLIPAQ
TOP VIEW
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
FUNCTION TABLE(1)
OEn Function
H Disconnected
L An = Bn
PIN DESCRIPTION
Pin Names Description
OEn Output Enable
An Data I/Os
Bn Data I/Os
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
NC
A0
A1
A2
A3
A4
A5
A6
A7
GND
NC
A8
A9
A10
A11
A12
A13
A14
A15
GND
NC
A16
A17
A18
A19
A20
A21
A22
A23
GND
NC
A24
A25
A26
A27
A28
A29
A30
A31
GND
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27
B28
B29
B30
B31
VCC
OE1
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
VCC
OE2
VCC
OE3
VCC
OE4
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IDTQS34X245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES INDUSTRIAL TEMPERATURE RANGE
RON
(ohms)
VIN
(Volts)
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit
VIH Input HIGH Level Guaranteed Logic HIGH for Control Pins 2 — — V
VIL Input LOW Level Guaranteed Logic LOW for Control Pins — — 0.8 V
IIN Input LeakageCurrent (Control Inputs) 0V ≤ VIN ≤ VCC —— ±1μA
IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ VCC, Switches OFF — — ±1μA
RON Switch ON Resistance VCC = Min., VIN = 0V, ION = 30mA — 5 7 Ω
VCC = Min., VIN = 2.4V, ION =15mA — 10 15
VPPass Voltage(2) VIN = VCC = 5V, IOUT = -5μA 3.7 4 4.2 V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%
NOTES:
1. Typical values are at VCC = 5.0V, TA = 25°C.
2. Pass Voltage is guaranteed but not production tested.
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
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INDUSTRIAL TEMPERATURE RANGE
IDTQS34X245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES
POWER SUPPLY CHARACTERISTICS
Symbol Parameter Test Conditions(1) Max. Unit
ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or Vcc, f = 0 12 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., A and B 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). A and B 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 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
TA = -40°C to +85°C, VCC = 5.0V ± 5%;
CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.
Symbol Parameter Min. (1) Typ. Max. Unit
tPLH Data Propagation Delay (1,2) — — 0.25 ns
tPHL An to/from Bn
tPZL Switch Turn-on Delay 0.5 — 5.6 ns
tPZH OE to An/Bn
tPLZ Switch Turn-off Delay (1) 0.5 — 5.2 ns
tPHZ OE to An/Bn
NOTES:
1. Minimums are guaranteed but not production tested.
2. 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.
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IDTQS34X245
HIGH-SPEED CMOS QUICKSWITCH 32-BIT MULTIWIDTH BUS SWITCHES INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
QS XXXXXX XX
Package
Device Type
Blank Industrial (-40°C to +85°C)
80-pin Millipaq - Green
Q3G
34X245 High-Speed CMOS Quickswitch 32-Bit Multiwidth Bus Switches
X
Process
X
Blank
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Tube or Tray
Tape and Reel
CORPORATE HEADQUARTERS for SALES: for Tech Support:
6024 Silver Creek Valley Road 800-345-7015 or 408-284-8200 logichelp@idt.com
San Jose, CA 95138 fax: 408-284-2775
www.idt.com
Datasheet Document History
10/14/08 Pg. 5 Updated the ordering information by removing the "IDT" notation.
08/15/12 Pg. 5 Updated the ordering information by removing non RoHS part and by adding Tape and Reel information.
