QS3245QG - Integrated Device Technology

IDTQS3245

HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE

JUNE 2006

2006 Integrated Device Technology, Inc. DSC-5753/4c

IDTQS3245

INDUSTRIAL TEMPERATURE RANGE

QUICKSWITCH® PRODUCTS

HIGH-SPEED CMOS

QUICKSWITCH

8-BIT BUS SWITCH

FUNCTIONAL BLOCK DIAGRAM

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

FEATURES:

• Enhanced N channel FET with no inherent diode to Vcc

•5

ΩΩ

Ω bidirectional switches connect inputs to outputs

• Pin compatible with the 74F245, 74FCT245, and 74FCT245T

• Low power CMOS proprietary technology

• Zero propagation delay, zero ground bounce

• Undershoot clamp diodes on all switch and control inputs

• TTL-compatible control inputs

• Available in SOIC and QSOP 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

DESCRIPTION:

The QS3245 provides a set of eight high-speed CMOS TTL-compatible

bus switches in a pinout compatible with 74FCT245, 74F245, 74ALS/AS/

LS245 8-bit transceivers. The low ON resistance of the QS3245 allows

inputs to be connected to outputs without adding propagation delay and

without generating additional ground bounce noise. The Output Enable

(OE) signal turns the switches on similar to the OE signal of the 74’245.

QuickSwitch devices provide an order of magnitude faster speed than

conventional logic devices.

The QS3245 is characterized for operation at -40°C to +85°C.

INDUSTRIAL TEMPERATURE RANGE

IDTQS3245

HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH

PIN CONFIGURATION

SOIC/ QSOP

TOP VIEW

NOTE:

1 . H = HIGH Voltage Level

L = LOW Voltage Level

FUNCTION TABLE(1)

OE Outputs

H Disconnected

L Ax = Bx

PIN DESCRIPTION

Pin Names Description

OE Output Enable

Ax Data I/Os

Bx Data I/Os

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

ABSOLUTE MAXIMUM RATINGS(1)

NOTE:

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.

GND

B7CAPACITANCE

(TA = +25°C, f = 1.0MHZ, VIN = 0V, VOUT = 0V)

NOTE:

1. This parameter is measured at characterization but not tested.

Pins Typ. Max.(1) Unit

Control Pins 3 5 pF

Quickswitch Channels (Switch OFF) 5 7 pF

IDTQS3245

HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE

RON

(ohms)

VIN

(Volts)

TYPICAL ON RESIST ANCE vs VIN AT VCC = 5V

Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit

VIH Input HIGH Level Guaranteed Logic HIGH for Control Pins 2 — — V

VIL Input LOW Level Guaranteed Logic LOW for Control Pins — — 0.8 V

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

IOZ Off-State Output Current (Hi-Z) 0V ≤ VOUT ≤ VCC, Switches OFF — ±0.001 ±1µA

RON Switch ON Resistance VCC = Min., VIN = 0V, ION = 30mA — 5 7 Ω

VCC = Min., VIN = 2.4V, ION =15mA — 10 15

VPPass Voltage(2) VIN = VCC = 5V, IOUT = -5μA 3.7 4 4.2 V

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%

NOTES:

1. Typical values are at VCC = 5.0V, TA = 25°C.

2. Pass Voltage is guaranteed but not production tested.

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

INDUSTRIAL TEMPERATURE RANGE

IDTQS3245

HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH

POWER SUPPLY CHARACTERISTICS

Symbol Parameter Test Conditions(1) Max. Unit

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

ΔICC Power Supply Current per Control Input HIGH (2) VCC = Max., VIN = 3.4V, f = 0 1.5 mA

ICCD Dynamic Power Supply Current per MHz(3) VCC = Max., A and B pins open 0.25 mA/MHz

Control Inputs Toggling at 50% Duty Cycle

NOTES:

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

2. Per TLL driven input (VIN = 3.4V, control inputs only). A and B pins do not contribute to ΔIcc.

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 but not production tested.

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

TA = -40°C to +85°C, VCC = 5.0V ± 5%;

CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.

Symbol Parameter Min. (1) Typ. Max. Unit

tPLH Data Propagation Delay (2,3) — — 0.25 ns

tPHL An to/from Bn

tPZL Switch Turn-on Delay 0.5 — 5.6 ns

tPZH OE to Ax/Bx

tPLZ Switch Turn-off Delay (2) 0.5 — 4.5 ns

tPHZ OE to Ax/Bx

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 for 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.

IDTQS3245

HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE

ORDERING INFORMATION

IDTQS XXXXX XX

Package

Device Type

Blank Industrial (-40°C to +85°C)

Small Outline IC

SOIC - Green

Quarter Size Outline Package

QSOP - Green

SOG

3245 High Speed CMOS Quickswitch 8-Bit Bus Switch

Process

CORPORATE HEADQUARTERS for SALES: for Tech Support:

6024 Silver Creek Valley Road 800-345-7015 or 408-284-8200 logichelp@idt.com

San Jose, CA 95138 fax: 408-284-2775