FEATURES/BENEFITS
• Enhanced N channel FET with no inherent diode to VCC
•5
ΩΩ
ΩΩ
Ω bidirectional switches connect inputs to outputs
• Zero propagation delay, zero ground bounce
• Undershoot clamp diodes on all switch and control pins
• Available in 24-pin QSOP, and SOIC (SO) packages
• QS32862 is 25ΩΩ
ΩΩ
Ω version for low noise
• Active Low and High enable control
APPLICATIONS
• Hot-swapping, hot-docking (Application Note AN-13)•
Voltage translation (5V to 3.3V; Application Note AN-11)
• Power conservation
• Capacitance reduction and isolation
• Applications requiring Active-High enabling
• Bus isolation
• Clock gating
DESCRIPTION
The QS3862 and QS32862 each provide a set of ten high speed
CMOS, TTL Compatible bus switches. The low ON resistance (5Ω) of
the QS3862 allows inputs to be connected to outputs without adding
propagation delay and without generating additional ground bounce
noise. The switches are controlled by independent active Low enable
(BE) and active High enable (BE) controls.
The QS32862 includes internal 25Ω series termination resistors to
reduce reflection noise in high speed applications. When closed, the
switch acts as the source (series) termination for the driver connected
to it.
The QS3862 is ideal for switching digital buses as well as hot-
plugging, hot-docking, and voltage translation.
FUNCTIONAL BLOCK DIAGRAM
QS3862
QS32862
ADVANCE
INFORMATION
QUICKSWITCH® PRODUCTS
HIGH-SPEED CMOS
10-BIT BUS SWITCH WITH
ACTIVE HIGH AND LOW ENABLES
OCTOBER 1999
1
1999 Integrated Device Technology, Inc DSC-XXXXXX
A0
A9
B0
B9
BE
BE
2
1999 Integrated Device Technology, Inc
IDT
QS3862 AND QS32862
DSC-XXXXXX
QSOP, SOIC
Pins Typ Max Unit
Control Inputs 3 5 pF
QuickSwitch Channels 5 7 pF
(Swithc OFF)
Name I/O Function
BE I Active High Bus Enable
BE I Active High Bus Enable
A0-A9 I/O Bus A
B0-B9 I/O Bus B
PIN DESCRIPTION
BE BE A0-A9 Function
L L Hi-Z Disconnect
L H Hi-Z Disconnect
H L B0-B9 Connect
L L Hi-Z Disconnect
FUNCTION TABLE
PIN CONFIGURATION
(ALL PINS TOP VIEW)
QSOP, SOIC (SO)
ABSOLUTE MAXIMUM RATINGS
Supply Voltage to Ground ...................................................................... –0.5V to +7.0V
DC Switch Voltage VS............................................................................ –0.5V to +7.0V
DC Input Voltage VIN .............................................................................. –0.5V to +7.0V
AC Input Voltage (for a pulse width ≤ 20ns)..........................................................–3.0V
DC Output Current Max. Sink Current/Pin...........................................................120mA
Maximum Power Dissipation ............................................................................0.5 watts
TSTG Storage Temperature ....................................................................–65° to +150°C
Note: ABSOLUTE MAXIMUM CONTINUOUS
RATINGS are those values beyond which
damage to the device may occur. Exposure to
these conditions or conditions beyond those
indicated may adversely affect device reliability.
Functional operation under absolute-maximum
conditions is not implied.
CAPACITANCE
TA = 25°C, f = 1MHz, VIN = 0V
Note: Capacitance is characterized but not
production tested. For total capacitance while the
switch is ON, please see Section 1 under “Input
and Switch Capacitance.”
24
23
22
21
20
19
18
17
16
15
14
13
BE
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
GND
VCC
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
1
2
3
4
5
6
7
8
9
10
11
12
BE
1999 Integrated Device Technology, Inc
IDT
QS3862 AND QS32862
DSC-XXXXXX
3
Symbol Parameter Test Conditions Min Typ(1) Max Unit
VIH Input HIGH Voltage Guaranteed Logic HIGH 2.0 — — V
for Control Inputs
VIL Input LOW Voltage Guaranteed Logic LOW — — 0.8 V
for Control Inputs
| IIN | Input Leakage Current 0 ≤ VIN ≤ VCC — 0.01 1 µA
(Control Inputs)
| IOZ | Off-State Current (Hi-Z) 0 ≤ VOUT ≤ VCC, Switches Off — 0.01 1 µA
RON Switch ON Resistance(2) VCC = Min., VIN = 0.0V, 3862 — 5 7 Ω
ION = 30mA 32862 20 28 40
RON Switch ON Resistance(2) VCC = Min., VIN = 2.4V 3862 — 10 15 Ω
ION = 15mA 32862 20 35 48
VPPass Voltage(3) VIN = VCC = 5V, IOUT = –5µA 3.7 4 4.2 V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
TA = –40°C to 85°C, VCC = 5.0V ± 10%
Notes:
1. Typical values indicate VCC = 5.0V and TA = 25°C.
2. For a diagram explaining the procedure for RON measurement, please see Section 1 under “DC Electrical Characteristics.”
Max. value of RON guaranteed, but not production tested.
3. Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE VS VIN AT VCC = 5.0V (QS3862)
Note: For QS32862, add 23Ω to R ON shown.
16
14
12
10
8
6
4
2
0
RON
(ohms)
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
VIN
(Volts)
4
1999 Integrated Device Technology, Inc
IDT
QS3862 AND QS32862
DSC-XXXXXX
POWER SUPPLY CHARACTERISTICS OVER OPERATING RANGE
TA = –40°C to 85°C, VCC = 5.0V ± 10%
Symbol Parameter Test Conditions(1) Typ(2) Max Unit
ICCQ Quiescent Power VCC = Max., VIN = GND or VCC, f = 0 0.2 3.0 µA
Supply Current
∆ICC Power Supply Current VCC = Max., VIN = 3.4V(3), f = 0 — 2.5 mA
per Input HIGH per Control Input
QCCD Dynamic Power Supply VCC = Max., A and B Pins Open, — 0.25 mA/
Current per MHz(4) BE, BE Inputs MHz
Toggling @ 50% Duty Cycle
Notes:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC specifications.
2. Typical Values are at VCC = 5.0V, +25°C Ambient.
3. Per TTL driven input (VIN = 3.4V, control inputs only). A and B pins do not contribute to ∆ICC.
4. 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.
QS3862 QS32862
Symbol Description(1) Min Typ Max Min Typ Max Unit
tPLH Data Propagation Delay(2,4) — — 0.25(3) — — 1.25(3) ns
tPHL A to B or B to A
tPZL Switch Turn-on Delay 1.5 — 6.5 1.5 — 7.5 ns
tPZH BE or BE to A or B
tPLZ Switch Turn-off Delay(2) 1.5 — 5.5 1.5 — 5.5 ns
tPHZ BE or BE to A or B
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = –40°C to 85°C, VCC = 5.0V ± 10%
CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.
Notes:
1. See Test Circuit and Waveforms. Minimums guaranteed but not production tested.
2. This parameter is guaranteed, but not production tested.
3. The time constant for the switch alone is of the order of 0.25ns for QS3862 and 1.25ns for QS32862 at C L = 50pF.The bus switch contributes no propagation
delay other than the RC delay of the ON resistance of the switch and the load capacitance. Since this time constant is much smaller than the rise/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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