IDT74LVCH2573A
INDUSTRIALTEMPERATURERANGE
3.3VCMOSOCTALTRANSPARENTD-TYPELATCH
3.3V CMOS OCTAL
TRANSPARENT D-TYPE LATCH
IDT74LVCH2573A
WITH 3-STATE OUTPUTS, 5 VOLT
TOLERANT I/O AND BUS-HOLD
FEATURES:
DESCRIPTION:
• 0.5 MICRON CMOS Technology
The LVCH2573A octal transparent D-type latch is built using advanced
dualmetalCMOStechnology.Thedevicefeatures3-stateoutputsdesigned
specificallyfordrivinghighlycapacitiveorrelativelylow-impedanceloads,
andisparticularlysuitableforimplementingbufferregisters,input-output(I/
O) ports, bidirectional bus drivers, and working registers.
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• VCC = 3.3V ± 0.3V, Normal Range
• VCC = 2.7V to 3.6V, Extended Range
• CMOS power levels (0.4µ W typ. static)
• Rail-to-rail output swing for increased noise margin
• All inputs, outputs, and I/O are 5V tolerant
• Supports hot insertion
Whilethelatch-enable(LE)inputishigh,theQoutputsfollowthedata(D)
inputs. When LE is taken low, the Q outputs are latched at the logic levels
at the D inputs.
Abufferedoutput-enable(OE)inputcanbeusedtoplacetheeightoutputs
in either a normal logic state (high or low logic levels) or a high-impedance
state.Inthehigh-impedancestate,theoutputsneitherloadnordrivethebus
lines significantly. The high-impedance state and increased drive provide
thecapabilitytodrivebuslineswithoutinterfaceorpullupcomponents. OE
doesnotaffecttheinternaloperationsofthelatch. Olddatacanberetained
ornewdatacanbeenteredwhiletheoutputsareinthehigh-impedancestate.
TheLVCH2573Ahasseriesresistorsinthedeviceoutputstructurewhich
willsignificantlyreducelinenoisewhenusedwithlightloads.Thisdriverhas
been developed to drive ±12mA at the designated thresholds.
Inputs can be driven from either 3.3V or 5V devices. This feature allows
theuseofthisdeviceasatranslatorinamixed3.3V/5Vsystemenvironment.
The LVCH2573A has “bus-hold” which retains the inputs’ last state
whenevertheinputgoestoahighimpedance. Thispreventsfloatinginputs
and eliminates the need for pull-up/down resistors.
• Available in SOIC, SSOP, QSOP, and TSSOP packages
DRIVE FEATURES:
• Balanced Output Drivers: ±12mA
• Low switching noise
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
FUNCTIONALBLOCKDIAGRAM
1
OE
11
LE
C1
1D
19
1Q
2
1D
TO SEVEN OTHER CHANNELS
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
INDUSTRIAL TEMPERATURE RANGE
FEBRUARY 2000
1
© 2000 Integrated Device Technology, Inc.
DSC-4942/1