SGS Thomson Microelectronics M74HCT273 Datasheet
OCTAL D TYPE FLIP FLOP WITH CLEAR
.HIGH SPEED
f
= 80 MHz (TYP.) AT VCC=5V
MAX
.LOWPOWER DISSIPATION
ICC=4µA(MAX.) AT TA=25°C
.COMPATIBLE WITH TTL OUTPUTS
VIH= 2V (MIN.) VIL= 0.8V (MAX)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICALOUTPUT IMPEDANCE
IOH =IOL= 4 mA (MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.PIN AND FUNCTION COMPATIBLE WITH
54/74LS273
DESCRIPTION
The M54/74HCT273 isa highspeedCMOSOCTAL
D-TYPEFLIPFLOPWITH CLEAR fabricated in silicon gate C2MOStechnology. It has the same high
speed performance of LSTTL combined with true
CMOSlow powerconsumption. Informationsignals
applied to D inputs are transferredto the Qoutputs
on thepositive-going edge of the clock pulse.
Whenthe CLEAR input isheld low,the Qoutput are
inthe lowlogiclevelindependent oftheotherinputs.
All inputs are equipped with protection circuits
against static discharge and transient excess voltage. This integrated circuit has input and output
characteristics that are fully compatible with 54/74
LSTTL logic families. M54/74HCT devices are designedto directly interface HSC2MOSsystems with
TTLand NMOScomponents. Theyare also plug in
replacements for LSTTL devices giving a reduction
of power consumption. Allinputs are equipped with
protection circuits against staticdischarge and transient excess voltage.
M54HCT273
M74HCT273
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC T273F1R M74H CT273M1R
M74HC T273B1R M74HCT273C1R
PIN CONNECTIONS(top view)
F1R
(CeramicPackage)
C1R
(Chip Carrier)
INPUT AND OUTPUT EQUIVALENT CIRCUIT
February 1993
NC =
No Internal
Connection
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M54/M74HCT273
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
1 CLEAR Master Reset Input
(Active LOW)
2, 5, 6, 9,
12, 15, 16,
19
3, 4, 7, 8,
13, 14, 17,
18
11 CLOCK Clock Input (LOW to
10 GND Ground (0V)
20 V
Q0 to Q7 Flip Flop Outputs
D0 to D7 Data Inputs
HIGH, Edge Triggered)
CC
Positive Supply Voltage
TRUTH TABLE
INPUTS OUTPUS
CLEAR CLOCK D QA
L X X L CLEAR
HLL
HHH
H X Qn NO CHANGE
X:Don’t Care
IEC LOGIC SYMBOL
FUNCTION
LOGI C DI AG RAM
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M54/M74HCT273
ABSOLU TE M AXIMU M R AT INGS
Symbol Parameter Value Unit
V
CC
V
V
O
I
IK
I
OK
I
O
I
or I
CC
P
D
T
stg
T
AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamage tothedevicemayoccur.Functionaloperationunder theseconditionisnotimplied.
(*)500 mW:≅ 65oC derateto 300 mWby 10mW/oC: 65oCto85oC
RECO MM ENDED OPERAT I N G C ONDI TIONS
Symbol Parameter Value Unit
V
CC
V
I
V
O
T
op
t
r,tf
Supply Voltage -0.5 to +7 V
DC Input Voltage -0.5 to VCC+ 0.5 V
I
DC Output Voltage -0.5 to VCC+ 0.5 V
DC Input Diode Current ± 20 mA
DC Output Diode Current ± 20 mA
DC Output Source Sink Current Per Output Pin ± 25 mA
DC VCCor Ground Current ± 50 mA
GND
Power Dissipation 500 (*) mW
Storage Temperature -65 to +150
Lead Temperature (10 sec) 300
L
Supply Voltage 4.5 to 5.5 V
Input Voltage 0 to V
Output Voltage 0 to V
Operating Temperature: M54HC Series
M74HC Series
CC
CC
-55 to +125
-40 to +85
Input Rise and Fall Time (VCC= 4.5 to 5.5V) 0 to 500 ns
o
C
o
C
V
V
o
C
o
C
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