ST M74HCT273 User Manual
M74HCT273
OCTAL D TYPE FLIP FLOP W ITH CLEAR
■ HIGH SPEED :
f
= 80 MHz (TYP.) at VCC = 4.5V
MAX
■ LOW POWER DISSIPATION:
I
=4µA(MAX.) at TA=25°C
CC
■ COMPAT I B LE WITH TT L OUTPUTS :
V
= 2V (MIN.) VIL = 0.8V (MAX)
IH
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
| = IOL = 4mA (MIN)
OH
■ BALANCED PROPAGATION DELAYS:
t
≅ t
PHL
PLH
■ PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 273
DESCRIPTION
The M74HCT273 is an high speed CMOS OCTAL
D TYPE FLIP FLOP WITH CLEAR fabricated with
silicon gate C
2
MOS technology.
Information signals applied to D inputs are
transferred to the Q output s on the positive-goi ng
edge of the clock pulse.
TSSOPDIP SOP
ORDER CODES
PACKAGE TUBE T & R
DIP M74HCT273B1R
SOP M74HCT273M1R M74HCT273RM13TR
TSSOP M74HCT273TTR
When the CLEAR
input is held low, the Q output
are in the low logic level independent of the other
inputs.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/10August 2001
M74HCT273
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
1 CLEAR
2, 5, 6, 9, 12,
15, 16, 19
3, 4, 7, 8, 13,
14, 17, 18
11 CLOCK
10 GND Ground (0V)
20 Vcc Positive Supply Voltage
TRUTH TABLE
Q0 to Q7 Flip Flop Outputs
D0 to D7 Data Inputs
Master Reset Input
(Active LOW)
Clock Input (LOW to
HIGH, Edge Triggered)
CLEAR
L X X L CLEAR
HLL
HHH
H X Qn NO CHANGE
X : Don’t Care
LOGIC DIAGRAM
INPUTS OUTPUTS
FUNCTION
CLOCK D Q
This log i c diagram has not be used to esti m ate propagation delays
2/10
M74HCT273
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
I
OK
I
I
or I
CC
P
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V
V
V
T
t
r
Supply Voltage
CC
DC Input Voltage -0.5 to VCC + 0.5
I
DC Output Voltage -0.5 to VCC + 0.5
O
DC Input Diode Current
IK
DC Output Diode Current
DC Output Current
O
DC VCC or Ground Current
GND
Power Dissipation
D
Storage Temperature
stg
Lead Temperature (10 sec)
L
°C; derate to 300mW by 10mW/°C from 65°C to 85°C
Supply Voltage
CC
Input Voltage 0 to V
I
Output Voltage 0 to V
O
Operating Temperature
op
, t
Input Rise and Fall Time (VCC = 4.5 to 5.5V)
f
-0.5 to +7 V
± 20 mA
± 20 mA
± 25 mA
± 50 mA
500(*) mW
-65 to +150 °C
300 °C
4.5 to 5.5 V
CC
CC
-55 to 125 °C
0 to 500 ns
V
V
V
V
DC SPECIFICATIONS
Symbol Parameter
V
V
V
V
I
∆ I
High Level Input
IH
Voltage
Low Level Input
IL
Voltage
High Level Output
OH
Voltage
Low Level Output
OL
Voltage
I
Input Leakage
I
Current
Quiescent Supply
CC
Current
Additional Worst
CC
Case Supply
Current
Test Condition Value
T
= 25°C
V
CC
(V)
A
Min. Typ. Max. Min. Max. Min. Max.
4.5
to
2.0 2.0 2.0 V
5.5
4.5
to
0.8 0.8 0.8 V
5.5
4.5
4.5
5.5
5.5
IO=-20 µA
I
=-4.0 mA
O
IO=20 µA
I
=4.0 mA
O
= VCC or GND
V
I
V
= VCC or GND
I
5.5 Per Input pin
= 0.5V or
V
I
V
= 2.4V
I
4.4 4.5 4.4 4.4
4.18 4.31 4.13 4.10
0.0 0.1 0.1 0.1
0.17 0.26 0.33 0.40
± 0.1 ± 1 ± 1 µA
2.0 2.9 3.0 mA
Other Inputs at
V
or GND
CC
I
= 0
O
-40 to 85°C -55 to 125°C
Unit
V
V
44080µA
3/10
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