SGS Thomson Microelectronics M74HCT244, M74HCT241, M74HCT240 Datasheet
OCTAL BUS BUFFERWITH3 STATE OUTPUTS
HCT24 0: INVERTED-H CT241 /244 NON INVER TED
.HIGH SPEED
tPD= 13 ns(TYP.) at VCC=5V
.LOWPOWER DISSIPATION
ICC=4µA (MAX.) at TA=25oC
.COMPATIBLE WITH TTL OUTPUTS
VIH= 2V (MIN.) VIL= 0.8V (MAX)
.OUTPUT DRIVE CAPABILITY
15 LSTTLLOADS
.SYMMETRICALOUTPUT IMPEDANCE
|IOH|=IOL=6 mA (MIN)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.PIN AND FUNCTION COMPATIBLE
WITH 54/74LS240/241/244
DESCRIPTION
M54HCT240/241/244
M74HCT240/241/244
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC TXXXF 1R M74HCTXXXM1R
M74HC TXXXB1R M74HCTXXX C1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
The M54/74HCT240, HCT241 and HCT244 are
high speed CMOS OCTAL BUS BUFFERs
fabricated in silicongate C2MOS technology.
They have the same high speed performance of
LSTTL combined with true CMOS low power
consumption. The designer has a choise of select
combination ofinverting and non-inverting outputs,
symmetrical G (active lowoutputcontrol) input, and
complementary G and G inputs. Each controlinput
governs four BUS BUFFERs.
This integrated circuit has input and output
PIN CONNECTION (top view)
characteristics that are fully compatible with 54/74
LSTTL logic families. M54/74HCT devices are
designed to directly interface HSC2MOS systems
with TTL and NMOS components.
They are also plug in replacements for LSTTL
devices giving a reduction of power consumption.
Thesedevicesaredesigned to be used with3 state
memory address drivers, etc.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
HCT244HCT241HCT240
September 1993
1/12
M54/M74HCT240/241/244
CHIP CARRIER
HCT244HCT241HCT240
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION (HC T240)
PIN No SYMBOL NAME AND FUNCTION
1 1G Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1 to 2Y4 Data Outputs
11, 13, 15,172A1 to 2A4 Data Inputs
PIN DESCRIPTION (HCT241)
PIN No SYMBOL NAME AND FUNCTION
1 1G Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1 to 2Y4 Data Outputs
11, 13, 15,172A1 to 2A4 Data Inputs
18, 16, 14,121Y1 to 1Y4 Data Outputs
19 2G Output Enabel Input
10 GND Ground (0V)
20 V
CC
Positive Supply Voltage
18, 16, 14,121Y1 to 1Y4 Data Outputs
19 2G Output Enabel Input
10 GND Ground (0V)
20 V
CC
Positive Supply Voltage
PIN DESCRIPTION (HCT244)
PIN No SYMBOL NAME AND FUNCTION
1 1G Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1 to 2Y4 Data Outputs
11, 13, 15,172A1 to 2A4 Data Inputs
18, 16, 14,121Y1 to 1Y4 Data Outputs
19 2G Output Enabel Input
10 GND Ground (0V)
20 V
CC
Positive Supply Voltage
2/12
IEC LOGIC SYMBOLS
TRUTH TABLE
M54/M74HCT240/241/244
HCT244HCT241HCT240
INPUT OUTPUT
G G (HCT241) An Yn (HCT240) Yn (HCT241) Yn (HCT244)
LHLHLL
LHHLHH
X: ”H” or ”L”
Z: High impedance
HLXZZZ
CIRCUIT SCHEMATIC (1/8 PACKAGE)
HCT240 HCT241/244
3/12
M54/M74HCT240/241/244
ABSOLU TE MAXI MU M RAT 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
AbsoluteMaximumRatingsarethosevalues beyondwhichdamageto thedevicemayoccur.Functionaloperationunder thesecondition isnotimplied.
(*)500 mW:≅ 65oC derateto 300 mW by 10mW/oC: 65oCto85oC
RECO MM ENDED OPERAT IN G CO NDI 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 ± 35 mA
DC VCCor Ground Current ± 70 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
4/12
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