Integrated Device Technology Inc IDTQS3125S1, IDTQS3125Q Datasheet

IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES

®

QUICKSWITCH

PRODUCTS
HIGH-SPEED CMOS
QUADRUPLE BUS SWITCH WITH
INDIVIDUAL ACTIVE LOW ENABLES

INDUSTRIAL TEMPERATURE RANGE

IDTQS3125

FEA TURES:

• Enhanced N channel FET with no inherent diode to Vcc

• Pin compatible with the 74’125 function

• Zero propagation delay, zero added ground bounce

• Undershoot clamp diodes on all switch and control inputs

• Available in QSOP and SOIC packages

APPLICA TIONS:

• Hot-swapping, hot-docking

• Voltage translation (5V to 3.3V)

• Power conservation

• Capacitance reduction and isolation (mass storage, work
stations)

• Logic replacement (data processing)

• Clock gating

• Bus isolation

FUNCTIONAL BLOCK DIAGRAM

DESCRIPTION:

The QS3125 provides a set of four high-speed low resistance CMOS
switches connecting inputs to outputs without propagation delay and without
generating additional ground bounce noise. Individual enables (OE) are
used to turn on the switches. The QS3125 is ideal for signal and control
switching since the device adds no noise, ground bounce, propagation
delay, or significant power consumption to the system. The QS3125 can also
be used for analog switching applications such as video.

QuickSwitch devices provide an order of magnitude faster speed than
conventional logic devices.

The QS3125 is characterized for operation at -40°C to +85°C.

1O E

2O E

3O E

4O E

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

INDUSTRIAL TEMPERATURE RANGE

1999 Integrated Device Technology, Inc. DSC-5598/1c

1A

2A 3A 4A

1Y 2Y 3Y 4Y

DECEMBER 1999

1

IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES

INDUSTRIAL TEMPERATURE RANGE

PIN CONFIGURATION

NC

1OE

A

1
1Y

2OE

2

A

2Y

GND

1
2

3
4
5
6
7
8

QSOP

TOP VIEW

16
15
14
13

12
11
10
9

V

CC

4OE
4

A

4Y
3OE

A

3
3Y
NC

ABSOLUTE MAXIMUM RATINGS

Symbol Description Max Unit

(2)

VTERM
VTERM
VTERM
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
T

STG 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 .

Supply Voltage to Ground –0.5 to +7 V

(3)

DC Switch Voltage VS –0.5 to +7 V

(3)

DC Input Voltage VIN –0.5 to +7 V

(1)

CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V , VOUT = 0V)

Pins Typ. Max.

OE (Inputs) 3 5 pF

Quickswitch Channels (Switch OFF) 5 7 pF

(1)

Unit

1OE

1
1Y

2OE

A

2

2Y

GND

NOTE:

1. This parameter is guaranteed but not production tested.

PIN DESCRIPTION

Pin Names I/ O Description

1

A

2
3

4
5
6

14
13

12
11
10
9

78

SOIC

TOP VIEW

V

CC

4OE

A

4
4Y
3OE

A

3
3Y

1A - 4A I/ O Bus A
1Y - 4Y I/ O Bus Y

1OE - 4OE I Bus Switch Enable

FUNCTION TABLE

xOE xA xY Function

L H H Connect
L L L Connect

H X X Disconnect

NOTE:

1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care

(1)

2

IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES

INDUSTRIAL TEMPERATURE RANGE

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5V ± 5%

Symbol Parameter Test Conditions Min. Typ.

VIH Input HIGH Voltage Guaranteed Logic HIGH for Control Inputs 2 — — V
VIL Input LOW Voltage Guaranteed Logic LOW for Control Inputs — — 0.8 V

IIN Input Leakage Current (Control Inputs) 0V ≤ VIN ≤ VCC ——±1µA

IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ VCC, Switches OFF — — ±1 µ A

R

ON Switch ON Resistance

(2)

VCC = Min., VIN = 0V, ION = 30mA — 5 7 Ω
VCC = Min., VIN = 2.4V, ION = 15mA — 10 15

VP Pass Voltage

(3)

VIN = VCC = 5V, IOUT = -5µA 3.7 4 4.2 V

(1)

Max. Unit

NOTES:

1. Typical values are at V

2. R

ON is guaranteed but not production tested.

3. Pass voltage is guaranteed but not production tested.

CC = 5V and TA = 25°C.

TYPICAL ON RESIST ANCE vs VIN AT VCC = 5V

16

RON

(ohms)

14
12
10

8
6
4
2
0

0.0 0.5

1.0

1.5 2.0 2.5 3.0 3.5

VIN

(Volts)

3

IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES

INDUSTRIAL TEMPERATURE RANGE

POWER SUPPLY CHARACTERISTICS

Symbol Parameter Test Conditions

ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or VCC, f = 0 3 µA

∆ICC Power Supply Current per Input HIGH

ICCD Dynamic Power Supply Current per MHz

NOTES:

1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.

2. Per TTL-driven input (VIN = 3.4V, control inputs only). A and Y 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 Y inputs generate no significant
AC or DC currents as they transition. This parameter is guaranteed but not production tested.

(2)

VCC = Max., VIN = 3.4V, f = 0 2.5 mA

(3)

VCC = Max., A and Y Pins Open, Control Inputs Toggling @ 50% Duty Cycle 0.25 mA/MHz

(1)

Max. Unit

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

TA = -40°C to +85°C, VCC = 5V ± 5%
CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.

Symbol Parameter Min.

t

PLH Data Propagation Delay

(2)

tPHL A to Y

PZL Switch Turn-On Delay 1.5  6.5 n s

t

tPZH OE to xA/xY

tPLZ Switch Turn-Off Delay

PHZ OE to xA/xY

t

NOTES:

1. Minimums are guaranteed but not production tested.

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 0.25ns 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.

(2)

(1)

0.25

Typ. Max. Unit

(3)

1.5  5.5 n s

ns

4

IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES

ORDERING INFORMATION

INDUSTRIAL TEMPERATURE RANGE

IDTQS

XXXXX

Device Type

XX

Package

X

Process

Blank

Q
S1

3125

Industria l (-4 0° C to +85 °C)

Quarter Size Outline Package
Small Outline IC

High Speed CMOS Quadruple Bus Switch with
Individual Active Low Enables

CORPORATE HEADQUARTERS for SALES: for Tech Support:

2975 Stender Way 800-345-7015 or 408-727-6116 [e-mail]
Santa Clara, CA 95054 fax: [phone] [phone]

www.idt.com

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