SGS Thomson Microelectronics M74HCT541, M74HCT540 Datasheet
OCTAL BUS BU FFER WITH3 STATEOUTPUTS
HCT540: INVERTED - HCT541 NON INVERTED
.HIGH SPEED
tPD= 10 ns(TYP.) at VCC=5V
.LOWPOWER DISSIPATION
ICC=4µA (MAX.) at TA=25oC
.COMPATIBLE WITH TTL OUTPUTS
VIH= 2V (MIN.) VIL= 0.8V (MAX.)
.OUTPUTDRIVE CAPABILITY
15 LSTTL LOADS
.SYMMETRICALOUTPUT IMPEDANCE
|IOH|=IOL=6 mA (MIN)
.BALANCEDPROPAGATIONDELAYS
t
PLH=tPHL
.PIN AND FUNCTION COMPATIBLE
WITH 54/74LS540/541
DESCRIPTION
M54HCT540/541
M74HCT540/541
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODE S :
M54HC TXXXF1R M74HC TXXXM1R
M74HC TXXXB1R M74HCT XXXC1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
The M54/74HCT540 and HCT541are high speed
CMOS OCTAL BUS BUFFERS (3-STATE)
fabricated in silicongate C2MOStechnology. They
have the same high speed performance of LSTTL
combined withtrue CMOS lowpower consumption.
The HCT540isaninverting bufferand HCT541 is a
non inverting buffer.
The 3 STATE control gate operates as a two input
AND suchthatifeither G1 andG2 are high,all eight
outputs are in thehigh impedance state. In order to
enhance PC board layout, the HCT540 and
HCT541 offers a pinout having inputs and outputs
on opposite sides of the package. All inputs are
equipped with protection circuits against static
PIN CONNECTION (top view)
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
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.
IT IS PROHIBITEDTO APPLY A SIGNALTO BUS
TERMINAL WHEN IT IS IN OUTPUT MODE.
WHEN A BUS TERMINAL IS FLOATING (HIGH
IMPEDANCE STATE) IT IS REQUESTED TO FIX
THE INPUT LEVEL BY MEANS OF EXTERNAL
PULL DOWN OR PULL UP RESISTOR.
HCT541HCT540
October 1993
1/12
M54/M74HCT540/541
CHIP CARRIER
INPUT AND OUTPUT EQUIVALENT CIRCUIT
HCT541HCT540
PIN DESCRIPTIO N ( HCT 540)
PIN No SYMBOL NAME AND FUNCTION
1, 19 G1, G2 Output Enable Inputs
2, 3, 4, 5,
6, 7, 8, 9
18, 17, 16,
15, 14, 13,
11, 12
10 GND Ground (0V)
20 V
2/12
A1 to A8 Data Inputs
Y1 to Y8 Bus Outputs
CC
Positive Supply Voltage
PIN DESCRIPTION (HCT 541)
PIN No SYMBOL NAME AND FUNCTION
1, 19 G1, G2 Output Enable Inputs
2, 3, 4, 5,
6, 7, 8, 9
18, 17, 16,
15, 14, 13,
11, 12
10 GND Ground (0V)
20 V
A1 to A8 Data Inputs
Y1 to Y8 Bus Outputs
CC
Positive Supply Voltage
IEC LOGIC SYMBOLS
TRUTH TABLE
M54/M74HCT540/541
HCT541HCT540
INPUT OUTPUT
G1 G2 An Yn (HCT540) Yn (HCT541)
HXXZZ
XHXZZ
LLHLH
X: ”H” or ”L”
Z: Highimpedance
LLLHL
CIRCUIT SCHEMATIC (Per Circuit)
HCT540 HCT541
3/12
M54/M74HCT540/541
ABSOLU TE MAXI MUM R AT ING S
Symbol Parameter Value Unit
V
CC
V
V
O
I
IK
I
OK
I
O
I
or I
CC
P
D
T
stg
T
AbsoluteMaximum Ratings arethosevalues beyondwhichdamagetothedevicemayoccur.Functionaloperationundertheseconditionsisnot implied.
(*)500 mW:≅ 65oC derate to300 mW by 10mW/oC: 65oCto85oC
RECO MM ENDED OPERATI N G CONDITIONS
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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