SGS Thomson Microelectronics M74HCT241PU, M74HCT240PU Datasheet
M54HCT240/241/244PU
M74HCT240/241/244PU
OCTAL BUS BUFFERSWITH PULL-UP INPUT NETWORK
B1R
(PlasticPackage)
ORDER CODES :
M54HCTXXXPUF1R M74HC T XXXPUM1R
M74HCT XXXPUB1R
F1R
(Ceramic Package)
M1R
(Micro Package)
PIN CONNECTION (top view)
.HIGH SPEED
t
PD
= 14 ns(TYP.) at VCC=5V
.LOWPOWER DISSIPATION
I
CCH
= 200 µA (TYP.)at TA=25oC
.COMPATIBLEWITH TTL OUTPUTS
V
IH
= 2V (MIN.) VIL= 0.8V (MAX)
.CURRENT SOURCES ON DATA INPUTS
ELIMINATETHE NEED OF EXTERNAL PULLUP RESISTORS
.OUTPUTDRIVECAPABILITY
15 LSTTL LOADS
.SYMMETRICALOUTPUT IMPEDANCE
|I
OH
|=IOL= 6 mA (MIN)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.PIN AND FUNCTIONCOMPATIBLE
WITH 54/74LS240/241/244
DESCRIPTION
The M54/74HCT240PU, HCT241PU and
HCT244PU are high speed CMOS OCTAL BUS
BUFFERs fabricated in silicon gate C
2
MOS
technology.
Theyhave thesamehighspeedperformance oftheir
non-PU counterpart, plus a unique input topology
which incorporates a constant current source for
eachdatainput. This resultsis in asmall I
IL
(-150µA
Typ.)wich can fix any data inputin the HIGH Logic
Levelwhenitisleftfloating,thuseliminatingtheneed
of external pull-up resistor network.
This feature makes these devices particularly
suitableinallapplications wherea databus needsto
beinterfacedtomanualcontrolslike:rotaryselectors,
keyboards, dip-switches, etc. The inputs are
compatible with TTL, NMOS and CMOS output
voltage levels. They achieve the high speed
operation similar to equivalent LSTTL while
maintaining the CMOS lowpower dissipation.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
HCT 244PUHCT241PUHCT240PU
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION (HCT240PU)
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 SupplyVoltage
PIN DESCRIPTION (HCT244PU)
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 SupplyVoltage
PIN DESCRIPTION(HCT241PU)
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
PositiveSupply Voltage
IEC LOGIC SYMBOLS
HCT 244PUHCT241PUHCT240PU
M54/M74HCT240PU/241PU/244PU
TRUTH TABLE
INPUT OUTPUT
G G(HCT241PU) An Yn(HCT240PU) Yn (HCT241PU) Yn(HCT244PU)
LHLHLL
LHHLHH
HLXZZZ
X: ”H” or”L”
Z: Highimpedance
CIRCUIT SCHEMATIC (1/8 PACKAGE)
HCT2 40PU HCT 241/244PU
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
SupplyVoltage -0.5 to +7 V
V
I
DC Input Voltage -0.5 to VCC+ 0.5 V
V
O
DC Output Voltage -0.5 to VCC+ 0.5 V
I
IK
DC Input Diode Current ± 20 mA
I
OK
DC Output Diode Current ± 20 mA
I
O
DC Output Source Sink CurrentPer OutputPin ± 35 mA
ICCor I
GND
DC VCCor Ground Current ± 70 mA
P
D
PowerDissipation 500 (*) mW
T
stg
StorageTemperature -65 to +150
o
C
T
L
Lead Temperature (10 sec) 300
o
C
AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamagetothedevicemayoccur.Functionaloperationundertheseconditionisnotimplied.
(*)500 mW:≅ 65
o
C derateto300mW by 10mW/oC: 65oCto85oC
M54/M74HCT240PU/241PU/244PU
Loading...