BUS SWITCH. QS3244 Datasheet

QS3244 SWITCH. Datasheet pdf. Equivalent


Part QS3244
Description HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH
Feature IDTQS3244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH QUICKSWITCH® PRODUCTS HIGH-SPEED CMOS QUICKSW.
Manufacture IDT
Datasheet
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IDTQS3244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH QUICK QS3244 Datasheet
Recommendation Recommendation Datasheet QS3244 Datasheet




QS3244
IDTQS3244
HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH
QUICKSWITCH® PRODUCTS
HIGH-SPEED CMOS
QUICKSWITCH
8-BIT BUS SWITCH
INDUSTRIALTEMPERATURERANGE
IDTQS3244
FEATURES:
• Enhanced N channel FET with no inherent diode to Vcc
• 5Ω bidirectional switches connect inputs to outputs
• Pin compatible with 74F244, 74FCT244, and 74FCT244T
• Zero propagation delay, zero ground bounce
• Undershoot clamp diodes on all switch and control inputs
• Available in QSOP, SOIC, and TSSOP packages
APPLICATIONS:
• Hot-swapping, hot-docking
• Voltage translation (5V to 3.3V)
• Power conservation
• Capacitance reduction and isolation
• Logic replacement (data processing)
• Clock gating
• Bus switching and isolation
FUNCTIONAL BLOCK DIAGRAM
DESCRIPTION:
The QS3244 provides a set of eight high-speed CMOS TTL-compatible
bus switches in a pinout compatible with 74FCT244, 74F244, 74ALS/AS/
LS244 8-bit drivers. The low ON resistance (5Ω) of the 3244 allows inputs
to be connected to outputs without adding propagation delay and without
generating additional ground bounce noise. The two enable (xG) signals
turn the switches on similar to the xG signals of the 74’244.
QuickSwitch devices provide an order of magnitude faster speed than
conventional logic devices.
The QS3244 is characterized for operation at -40°C to +85°C.
1G 2G
1A1 1Y1 2A1 2Y1
1A2 1Y2 2A2 2Y2
1A3 1Y3 2A3 2Y3
1A4 1Y4 2A4 2Y4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
c 2011 Integrated Device Technology, Inc.
1
FEBRUARY 2011
DSC-5722/9



QS3244
IDTQS3244
HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH
PIN CONFIGURATION
1G
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 2G
18 1Y1
17 2A4
16 1Y2
15 2A3
14 1Y3
13 2A2
12 1Y4
11 2A1
QSOP/ SOIC/ TSSOP
TOP VIEW
INDUSTRIALTEMPERATURERANGE
ABSOLUTE MAXIMUM RATINGS(1)
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 = 85°C)
0.5
W
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 .
CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V, VOUT = 0V)
Pins Typ. Max.(1) Unit
Control Inputs
3 5 pF
Quickswitch Channels (Switch OFF)
5
7 pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
1G, 2G
Output Enable
Ax, Yx
Data I/Os
Description
FUNCTION TABLE(1)
1G 2G
1A, 1Y I/Os
H H Disconnected
LH
1Ax = 1Yx
H L Disconnected
L L 1Ax = 1Yx
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
2A, 2Y I/Os
Disconnected
Disconnected
2Ax = 2Yx
2Ax = 2Yx
2







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