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 (QS3384), zero ground bounce
• Undershoot clamp diodes on all switch and control pins
• QS32384 is 25ΩΩ
ΩΩ
Ω version for low noise
• Two enables control five bits each
• Available in TSSOP, SOIC, QSOP AND HQSOP
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
• Bus isolation
• Clock gating
DESCRIPTION
The QS3384 and QS32384 provide a set of ten high-speed CMOS,
TTL-compatible bus switches. The low ON resistance of QS3384
allows inputs to be connected to outputs without adding propagation
delay and without generating additional ground bounce. Two banks of
5 switches are controlled by independent Bus Enable (BE) signals.
The QS32384 adds an internal series resistor with each switch to
reduce reflection noise in high speed applications. When closed, the
switch acts as the source (series) termination for the driver connected
to it.
B4
BEB
BEA
B0
A4
A0
B9
B5
A9
A5
QS3384
QS32384
QUICKSWITCH® PRODUCTS
HIGH-SPEED CMOS
10-BIT BUS SWITCHES
FUNCTIONAL BLOCK DIAGRAM
JULY 1999
1
1999 Integrated Device Technology, Inc DSC-XXXXXX
2
1999 Integrated Device Technology, Inc
IDT
QS3384 AND QS32384
DSC-XXXXXX
SOIC, QSOP
Pins Typ Max Unit
Control Inputs 3 5 pF
QuickSwitch Channels 5 7 pF
(Switch OFF)
Name I/O Function
A0-A9 I/O Bus A
B0-B9 I/O Bus B
BEA, BEB I Bus Switch Enable
PIN DESCRIPTION
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 CONTINU-
OUS 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.
PIN CONFIGURATION
(ALL PINS TOP VIEW)
TSSOP, SOIC, QSOP, HQSOP
CAPACITANCE
TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V
Note:Capacitance is guaranteed but not
production tested. For total capacitance while
the switch is ON, please see Section 1 under
“Input and Switch Capacitance.”
BEA BEB B0-B4 B5-B9 Function
H H Hi-Z Hi-Z Disconnect
L H A0-A4 Hi-Z Connect
H L Hi-Z A5-A9 Connect
L L A0-A4 A5-A9 Connect
FUNCTION TABLE
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
BEA
B0
A0
A1
B1
B2
A2
A3
B3
B4
A4
GND
V
CC
B9
A9
A8
B8
B7
A7
A6
B6
B5
A5
BEB
1999 Integrated Device Technology, Inc
IDT
QS3384 AND QS32384
DSC-XXXXXX
3
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Commercial: TA = –40°C to 85°C, VCC = 5.0V ±5% Military: TA = –55°C to 125°C, VCC = 5.0V ±10%
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., 3384 (Com) — 5 7 Ω
VIN = 0.0V 3384 (Mil) — 10 15
ION = 30mA 32384 (Com) 20 28 40
32384 (Mil) — 35 45
RON Switch ON Resistance(2) VCC = Min., 3384 (Com) — 10 15 Ω
VIN = 2.4V 3384 (Mil) — 15 20
ION = 15mA 32384 (Com) 20 35 48
32384 (Mil) — 40 55
VPPass Voltage(3) VIN = VCC = 5V, IOUT = –5µA 3.7 4 4.2 V
TYPICAL ON RESISTANCE VS VIN AT VCC = 5.0V (QS3384)
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.
Note: For QS32384, add 23Ω to RON shown.
16
14
12
10
8
6
4
2
0
R
ON
(ohms)
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
V
IN
(Volts)
4
1999 Integrated Device Technology, Inc
IDT
QS3384 AND QS32384
DSC-XXXXXX
POWER SUPPLY CHARACTERISTICS OVER OPERATING RANGE
Commercial: TA = –40°C to 85°C, VCC = 5.0V ±5% Military: TA = –55°C to 125°C, VCC = 5.0V ±10%
Symbol Parameter Test Conditions(1) Max Unit
ICCQ Quiescent Power VCC = Max., VIN = GND or VCC, f = 0 1.5 mA
Supply Current
∆ICC Power Supply Current VCC = Max., VIN = 3.4V, f = 0 2.5 mA
per Input HIGH(2) per Control Input
QCCD Dynamic Power Supply VCC = Max., A and B Pins Open, Control 0.25 mA/
Current per MHz(3) Inputs Toggling @ 50% Duty Cycle MHz
QS3384 QS32384
Symbol Description(1) Min Typ Max Min Typ Max Unit
tPLH Data Propagation Delay(2,4) COM — — 0.25(3) — — 1.25(3) ns
tPHL Ai to Bi, Bi to Ai MIL — — 0.75(3) — — 1.75(3)
tPZL Switch Turn-on Delay COM 1.5 — 6.5 1.5 — 7.5 ns
tPZH BEA, BEB to Ai, Bi MIL 1.5 — 7.5 1.5 — 8.5
tPLZ Switch Turn-off Delay(2) COM 1.5 — 5.5 1.5 — 5.5 ns
tPHZ BEA, BEB to Ai, Bi MIL 1.5 — 6.5 1.5 — 6.5
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Commercial: TA = –40°C to 85°C, VCC = 5.0V ±5% Military: TA = –55°C to 125°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 by but not production tested.
3. The time constant for the switch alone is of the order of 0.25ns for QS3384 and 1.25ns for QS3284 for C L = 50pF.
4. 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.
Notes:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC specifications.
2. Per TTL driven input (VIN = 3.4V, control inputs only). 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 by characterization, but not production tested.
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