The M54/74HC298 isahighspeedCMOSQUAD2CHANNEL MULTIPLEXER/REGISTER fabricated
in silicongate C2MOStechnology.
It has the same high speed performance of LSTTL
combined withtrue CMOSlowpower consumption.
Thesecircuits are controlled by the signals WORD
SELECT and CLOCK. When the WORD SELECT
input is taken low Word 1 (A1, B1, C1 and D1) is
presented to the input of the flip-flops, and when
WORDSELECT ishighWord 2(A2,B2,C2 and D2)
is presented to theinputs of theflip-flops. Theselect
wordis clockedtothe outputterminals onthe negative edge oftheclockpulse. Allinputsare equipped
with protection circuitsagainst static discharge and
transient excess voltage.
M54HC298
M74HC298
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC 298F1RM74H C298M1R
M74HC 298B1RM74HC2 98C1R
PIN CONNECTIONS(top view)
F1R
(CeramicPackage)
C1R
(Chip Carrier)
INPUT AND OUTPUT EQUIVALENT CIRCUIT
October 1992
NC =
No Internal
Connection
1/11
Page 2
M54/M74HC298
TRUTH TABLE
INPUTSOUTPUTS
WORD SELECTCLOCKQAQBQCQD
La1b1c1d1
Ha2b2c2d2
X: DON’T CARE(INCLUDINGTRANSITION)
a1, a2, ETC: THE LEVELOF STEAY STATEINPUT ATa1, a2,etc.
QA0, QB0,ETC: THE LEVEL OF QA, QB,ETC ENTEREDON THE MOSTRECENT NEGATIVETRANSITION OF THECLOCK INPUT.
LOGI C DI AGRAM
XQA0QB0QC0QD0
2/11
Page 3
M54/M74HC298
PIN DESC RIPTION
IEC LOGIC SYMBOL
PIN NoSYMBOLNAME AND FUNCTION
1, 2, 5, 6A2, B2,
Word 2 Data Inputs
C2, D2
3, 4, 7, 9A1, B1,
Word 1 Data Inputs
C1, D1
12 to 15QA to QDOutputs
10WORD
Word Select Input
SELECT
11CLOCKClock Input (HIGH to
LOW, Edge-triggered)
8GNDGround (0V)
16V
CC
Positive Supply Voltage
ABSOLU TE M AXIMU M R AT INGS
SymbolParameterValueUnit
V
CC
V
V
O
I
IK
I
OK
I
O
or I
I
CC
P
D
T
stg
T
AbsoluteMaximumRatingsarethose valuesbeyond whichdamage to thedevice mayoccur.Functional operation under these conditionisnotimplied.
(*)500 mW: ≅ 65oC derateto300 mWby 10mW/oC: 65oCto85oC
Supply Voltage-0.5 to +7V
DC Input Voltage-0.5 to VCC+ 0.5V
I
DC Output Voltage-0.5 to VCC+ 0.5V
DC Input Diode Current± 20mA
DC Output Diode Current± 20mA
DC Output Source Sink Current Per Output Pin± 25mA
DC VCCor Ground Current± 50mA
GND
Power Dissipation500 (*)mW
Storage Temperature-65 to +150
Lead Temperature (10sec)300
L
o
C
o
C
RECO MM ENDED OPERATI N G CO NDI TIONS
SymbolParameterValueUnit
V
V
T
t
V
r,tf
Supply Voltage2 to 6V
CC
Input Voltage0 to V
I
Output Voltage0 to V
O
Operating Temperature: M54HC Series
op
M74HC Series
CC
CC
-55 to +125
-40 to +85
Input Rise and Fall TimeVCC= 2 V0 to 1000ns
V
= 4.5 V0 to 500
CC
= 6 V0 to 400
V
CC
V
V
o
C
o
C
3/11
Page 4
M54/M74HC298
DC SPECIFICATIONS
SymbolParameter
V
V
V
V
I
High Level Input
IH
Voltage
Low Level Input
IL
Voltage
High Level
OH
Output Voltage
Low Level Output
OL
Voltage
I
Input Leakage
I
Current
Quiescent Supply
CC
Current
Test ConditionsValue
V
(V)
CC
=25oC
A
54HC and 74HC
Min.Typ.Max.Min.Max.Min.Max.
-40 to 85oC
74HC
-55 to 125oC
54HC
Unit
T
2.01.51.51.5
4.53.153.153.15
6.04.24.24.2
2.00.50.50.5
4.51.351.351.35
6.01.81.81.8
2.0
4.54.44.54.44.4
6.05.96.05.95.9
4.5I
6.0I
2.0
4.50.00.10.10.1
6.00.00.10.10.1
4.5I
6.0I
6.0
=
V
I
IO=-20 µA
V
IH
or
V
IL
=-4.0 mA 4.184.314.134.10
O
=-5.2 mA 5.685.85.635.60
O
V
=
I
IO=20µA
V
IH
or
V
IL
= 4.0 mA0.170.260.330.40
O
= 5.2 mA0.180.260.330.40
O
VI=VCCor GND±0.1±1±1µA
1.92.01.91.9
0.00.10.10.1
6.0 VI=VCCor GND44080µA
V
V
V
V
4/11
Page 5
M54/M74HC298
AC ELECTRICAL CHARACTERISTICS (CL=50pF,Inputtr=tf=6ns)
Test ConditionsValue
T
=25oC
SymbolParameter
t
t
TLH
THL
Output Transition
Time
V
CC
(V)
2.0307595110
4.58151922
A
54HC and 74HC
Min.Typ.Max.Min.Max.Min.Max.
6.07131619
t
PLH
t
PHL
f
MAX
Propagation
Delay Time
(CLOCK - Q)
Maximum Clock
Frequency
2.045125155190
4.515253138
6.013212632
2.07225.64.6
4.535672823
6.041793325
t
W(H)
t
W(L)
Minimum Pulse
Width
(CLOCK)
Minimum Set-up
t
s
Time
(A, B, C, D)
t
Minimum Set-up
s
Time
(W. S.)
Minimum Hold
t
h
Time
(A, B, C, D)
Minimum Hold
t
h
Time
(W. S.)
C
C
PD
Input Capacitance5101010pF
IN
(*)Power Dissipation
2.0187595110
4.56151922
6.06131619
2.012506575
4.53101315
6.0291113
2.0307595110
4.58151922
6.06131619
2.0253040
4.5568
6.0457
2.0000
4.5000
6.0000
39
Capacitance
(*) CPDisdefined as the value ofthe IC’sinternal equivalent capacitance which is calculated fromthe operatingcurrent consumption without load.
(Referto Test Circuit).Average operting currentcanbe obtained by the followingequation.ICC(opr) = CPD•VCC•fIN+ICC/4 (perbit),and theCPDfor
operating current can be obtained by the following equation: CPD= 27 +12 xn
-40 to 85oC
74HC
-55 to 125oC
54HC
Unit
ns
ns
MHz
ns
ns
ns
ns
ns
pF
5/11
Page 6
M54/M74HC298
SWITCHING CHARACTERISTICS TEST WAVEFORM
TEST CIRCUIT
TRANSITIONTIME AND VIH,VILOFINPUTWAVEFORMIS THE SAMEAS THATIN CASEOFSWITCHINGCHARACTERISTICSTEST.
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consequences of useof suchinformation nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted byimplication or otherwiseunder any patentor patentrights ofSGS-THOMSON Microelectronics.Specificationsmentioned
in this publication are subjectto changewithout notice. This publication supersedes andreplaces all information previouslysupplied.
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