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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16245
2.5V / 3.3V 16-BIT HIGH BANDWIDTH BUS SWITCH
MARCH 2002
2002 Integrated Device Technology, Inc. DSC-5876/3c
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
DESCRIPTION:
The QS3VH16245 HotSwitch is a 16-bit high bandwidth bus switch. The
QS3VH16245 has very low ON resistance, resulting in under 250ps
propagation delay through the switch. The switches can be turned ON under
the control of the LVTTL-compatible Output Enable signals (OEx) for bidirec-
tional data flow with no added delay or ground bounce. In the ON state, the
switches can pass signals up to 5V. In the OFF state, the switches offer very
high impedance at the terminals.
The combination of near-zero propagation delay, high OFF impedance, and
over-voltage tolerance makes the QS3VH16245 ideal for high performance
communications applications.
The QS3VH16245 is characterized for operation from -40°C to +85°C.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FEATURES:
• N channel FET switches with no parasitic diode to Vcc
−−
−−
−Isolation under power-off conditions
−−
−−
−No DC path to Vcc or GND
−−
−−
−5V tolerant in OFF and ON state
• 5V tolerant I/Os
• Low RON - 4ΩΩ
ΩΩ
Ω typical
• Flat RON characteristics over operating range
• Rail-to-rail switching 0 - 5V
• Bidirectional dataflow with near-zero delay: no added ground
bounce
• Excellent RON matching between channels
• Vcc operation: 2.3V to 3.6V
• High bandwidth - up to 500 MHz
• LVTTL-compatible control Inputs
• Undershoot Clamp Diodes on all switch and control Inputs
• Low I/O capacitance, 4pF typical
• Available in SSOP and TSSOP packages
APPLICATIONS:
• Hot-swapping
• 10/100 Base-T, Ethernet LAN switch
• Low distortion analog switch
• Replaces mechanical relay
• ATM 25/155 switching
IDTQS3VH16245
PRELIMINARY
QUICKSWITCH® PRODUCTS
2.5V / 3.3V 16-BIT HIGH
BANDWIDTH BUS SWITCH
B8
A8
B9
A9
B10
A10
B11
A11
B12
A12
B13
A13
B14
A14
B15
A15
OE2
B0
OE1
A0
B1
A1
B2
A2
B3
A3
B4
A4
B5
A5
B6
A6
B7
A7
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16245
2.5V / 3.3V 16-BIT HIGH BANDWIDTH BUS SWITCH
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Max. Unit
VTERM(2) Supply Voltage to Ground – 0.5 to 4.6 V
VTERM(3) DC Switch Voltage VS– 0.5 to 5.5 V
VTERM(3) DC Input Voltage VIN – 0.5 to 5.5 V
VAC AC Input Voltage (pulse width ≤20ns) – 3 V
IOUT DC Output Current (max. current/pin) 120 mA
TSTG Storage Temperature -65 to +150 °C
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. VCC terminals.
3. All terminals except VCC.
PIN CONFIGURATION
SSOP/ TSSOP
TOP VIEW
CAPACITANCE (TA = +25oC, f = 1MHz, VIN = 0V, VOUT = 0V)
Symbol Parameter(1) Typ. Max. Unit
CIN Control Inputs 3 5 pF
CI/O Quickswitch Channels (Switch OFF) 4 6 pF
CI/O Quickswitch Channels (Switch ON) 8 12 p F
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names Description
OEx Output Enables
Ax Data I/Os
Bx Data I/Os
FUNCTION TABLE(1)
OE1OE2A0 - A7A8 - A15 Function
LLB0 - B7B8 - B15 Connect
LH B0 - B7ZA0 - A7 = B0 - B7, B8 - B15
Disconnect
HL Z B8 - B15 B0 - B7, Disconnect,
A8 - A15 = B8 - B15
H H Z Z Disconnect
NOTE:
1 . H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedence
48
NC OE1
147 A02
B0
25
NC 24 OE2
46
3
B1 A1
45
4GND GND
445B2 A2
43
6B3 A3
41
8
B4 A4
40
9B5 A5
39
10GND GND
42
7VCC VCC
38
11B6 A6
37
B7 12 A7
36
B8 A8
13 35 A9
14B9 34
15GND GND
3316B10 A10
32
17B11 A11
31
18VCC VCC
2920B13 A13
28
21
GND GND
2722B14 A14
3019B12 A12
26
23
B15 A15
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16245
2.5V / 3.3V 16-BIT HIGH BANDWIDTH BUS SWITCH
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 3.3V ± 0.3V
Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit
VIH Input HIGH Voltage Guaranteed Logic HIGH VCC = 2.3V to 2.7V 1 . 7 — — V
for Control Inputs VCC = 2.7V to 3.6V 2 — —
VIL Input LOW Voltage Guaranteed Logic HIGH VCC = 2.3V to 2.7V — — 0 . 7 V
for Control Inputs VCC = 2.7V to 3.6V — — 0 . 8
IIN Input Leakage Current (Control Inputs) 0V ≤ VIN ≤ VCC ——±1µA
IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ 5V, Switches OFF — — ±1 µA
IOFF Data Input/Output Power Off Leakage VIN or VOUT 0V to 5V, VCC = 0V — — ±1 µA
VCC = 2.3V VIN = 0V ION = 30mA — 6 8
RON Switch ON Resistance (Typ. at VCC = 2.5V) VIN = 1.7V ION = 15mA — 7 9 Ω
VCC = 3V VIN = 0V ION = 30mA — 4 6
VIN = 2.4V ION = 15mA — 5 8
NOTE:
1. Typical values are at VCC = 3.3V and TA = 25°C, unless otherwise noted.
TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V
RON
(ohms)
VIN
(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 4.0 5.04.5
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16245
2.5V / 3.3V 16-BIT HIGH BANDWIDTH BUS SWITCH
POWER SUPPLY CHARACTERISTICS
Symbol Parameter Test Conditions(1) Min. Typ. Max. Unit
ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or VCC, f = 0 — 1.5 3 mA
∆ICC Power Supply Current(2,3) per Input HIGH VCC = Max., VIN = 3V, f = 0 per Control Input — — 30 µA
ICCD Dynamic Power Supply Current(4) VCC = 3.3V, A and B Pins Open, Control Inputs See Typical ICCD vs Enable Frequency graph below
Toggling @ 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per input driven at the specified level. A and B pins do not contribute to ∆Icc.
3. This parameter is guaranteed but not tested.
4. This parameter represents the current required to switch internal capacitance at the specified frequency. The A and B inputs do not contribute to the Dynamic Power Supply
Current. This parameter is guaranteed but not production tested.
TYPICAL ICCD vs ENABLE FREQUENCY CURVE AT VCC = 3.3V
ICCD (mA)
ENABLE FREQUENCY (MHZ)
0
2
4
6
8
10
12
14
16
18
20
02468101214161820
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16245
2.5V / 3.3V 16-BIT HIGH BANDWIDTH BUS SWITCH
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C VCC = 2.5 ± 0.2V (1) VCC = 3.3 ± 0.3V (1)
Symbol Parameter Min. (4) Max. Min. (4) Max. Unit
tPLH Data Propagation Delay(2,3) 0.2 0.2 ns
tPHL Ax to/from Bx
tPZH Switch Turn-On Delay 1.5 8 1.5 8 ns
tPZL OEx to Ax/Bx
tPHZ Switch Turn-Off Delay 1.5 7.5 1.5 7.5 ns
tPLZ OEx to Ax/Bx
fOEx Operating Frequency - Enable (2,5) 10 20 MHz
NOTES:
1. See Test Conditions under TEST CIRCUITS AND WAVEFORMS.
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 0.2ns at 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. Minimums are guaranteed but not production tested.
5. Maximum toggle frequency for OEx control input (pass voltage > VCC, VIN = 5V, RLOAD > 1MΩ, no CLOAD).
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16245
2.5V / 3.3V 16-BIT HIGH BANDWIDTH BUS SWITCH
PHY
3VH
SWITCH
4.5VPP
LOGIC
SIDE Z = 100 Ω10M bps to 1 00 Mb ps
2VPP
4.5VPP
LOGIC
SIDE
Z = 100 Ω
TWISTED PAIR
>100m
CHARGE PUMP
OE
Vcc = 3.3V
0 to +5V NFET
+6.5V
DRIVER
0 to +5V
SINGLE HOT
SWITCH
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
CPU
RAM
BUS
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
PLUGGABLE CARD/ LIVE SYSTEM ZERO DOWN TIME SYSTEM
Rail-to-Rail Switching
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
Fast Ethernet Data Switching (LAN Switch)
Hot Swapping
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16245
2.5V / 3.3V 16-BIT HIGH BANDWIDTH BUS SWITCH
Open
VLOAD
GND
VCC
Pulse
Generator D.U.T.
500Ω
500Ω
CL
RT
VIN VOUT
(1 , 2)
SAME PHASE
INPUT TRANSITION
OPPO SITE PHASE
INPUT TRANSITION
0V
0V
VOH
VOL
tPLH tPHL
tPHL
tPLH
OUTPUT
VIH
VT
VT
VIH
VT
CONTROL
INPUT tPLZ 0V
OUTPUT
NORMALLY
LOW tPZH
0V
SWITCH
CLOSED
OUTPUT
NORMALLY
HIGH
ENABLE DISABLE
SWITCH
OPEN
tPHZ
0V
VOL + VLZ
VOH
VT
VT
tPZL
VLOAD/2 VLOAD/2
VIH
VT
VOL
VOH -VHZ
TEST CIRCUITS AND WAVEFORMS
Enable and Disable Times
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
Propagation Delay
Test Circuits for All Outputs
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
NOTES:
1. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2ns; tR ≤ 2ns.
SWITCH POSITION
Test Switch
tPLZ/tPZL VLOAD
tPHZ/tPZH GND
tPD Open
TEST CONDITIONS
Symbol VCC(1)= 3.3V ± 0.3V VCC(2)= 2.5V ± 0.2V Unit
VLOAD 6 2 x Vcc V
VIH 3 Vcc V
VT1.5 VCC/2 V
VLZ 300 150 mV
VHZ 300 150 mV
CL50 30 pF
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16245
2.5V / 3.3V 16-BIT HIGH BANDWIDTH BUS SWITCH
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 T ype
3VH16245 2.5V / 3.3V 16-Bit High Bandwidth Bus S witch
PV
PA Shrink Small Outl ine IC
Thin Shrink Small Outline Package
