INDUSTRIALTEMPERATURERANGE

IDT74ALVCHR16501

3.3VCMOS18-BITUNIVERSALBUSTRANSCEIVERWITH3-STATEOUTPUTS

1

JANUARY 2004

INDUSTRIAL TEMPERATURE RANGE

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

© 2004 Integrated Device Technology, Inc.

DSC-4613/2

FEATURES:

• 0.5 MICRON CMOS Technology

• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using

machine model (C = 200pF, R = 0)

• CMOS power levels (0.4

µµµµµ W typ. static)

• Rail-to-Rail output swing for increased noise margin

• Available in TSSOP package

FUNCTIONAL BLOCK DIAGRAM

IDT74ALVCHR16501

3.3V CMOS 18-BIT UNIVERSAL

BUS TRANSCEIVER WITH

3-STATE OUTPUTS

AND BUS-HOLD

DRIVE FEATURES:

• Balanced Output Drivers: ±12mA

• Low Switching Noise

APPLICATIONS:

• 3.3V high speed systems

• 3.3V and lower voltage computing systems

DESCRIPTION:

This 18-bit universal bus transceiver is built using advanced dual metal

CMOStechnology.Dataflowineachdirectioniscontrolledbyoutput-enable

(OEAB and OEBA), latch enable (LEAB and LEBA) and clock (CLKAB and

CLKBA) inputs. For A-to-B data flow, the device operates in the transparent

mode when LEAB is high. When LEAB is low, the A data is latched if CLKAB

isheldatahighorlowlogiclevel.IfLEABislow,theAdataisstoredinthelatch/

flip-floponthelow-to-hightransitionofCLKAB.WhenOEABishigh,theoutputs

areactive.WhenOEABislow,theoutputsareinthehigh-impedancestate.Data

flowfromBtoAissimiliartothatofAtoBbutusesOEBA,LEBA,andCLKBA.

Theoutputenablesarecomplementary(OEABisactivehighandOEBAisactive

low).

TheALVCHR16501hasseriesresistorsinthedeviceoutputstructurewhich

willsignificantlyreducereducelinenoisewhenusedwithlightloads.Thisdriver

has been designed to drive ±12mA at the designated threshold levels.

The ALVCHR16501 has “bus-hold” which retains the inputs’ last state

whenevertheinputbusgoestoahighimpedance.Thispreventsfloatinginputs

andeliminatestheneedforpull-up/downresistors.

OEBA

CLKBA

LEBA

CLKAB

OEAB

TO 17 OTHER CHANNELS

C1

1D

CLK

3

27

30

28

2

55

1

54

LEAB

C1

1D

CLK