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STMicroelectronics Electronic Components Datasheet

M54HCT640 Datasheet

OCTAL BUS TRANSCEIVER3-STATE: HCT245 NON INVERTING HCT640 INVERTING / HCT643 INVERTING/NON INVERTING

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M54HCT640 pdf
M54/74HCT245/640/643
M54/74HCT245/640/643
OCTAL BUS TRANSCEIVER (3-STATE): HCT245 NON INVERTING
HCT640 INVERTING, HCT643 INVERTING/NON INVERTING
. HIGH SPEED
tPD = 10 ns (TYP.) at VCC = 5V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) at TA = 25 oC
. COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN.) VIL = 0.8V (MAX.)
. OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
|IOH| = IOL = 6 mA (MIN)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS245/640/643
DESCRIPTION
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCTXXXF1R M74HCTXXXM1R
M74HCTXXXB1R M74HCTXXXC1R
The M54/74HCT245, HCT640 and HCT643 utilise
silicon gate C2MOS technology to achive operating
speeds eqivalent to LSTTL devices.
Along with the low power dissipation and high noise
immunity of standad CMOS integrated circuit, it
possesses the capability to drive 15 LSTTL loads.
These IC’s are intended for two-way asynchronous
communication between data buses, and the
direction of data trasmission is determined by DIR
input. The enable input (G) can be used to disable
the device so that the buses are effectively isolated.
All input are equipped with protection circuits
against static discharge and transient discharge.
These integrated circuits have 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 PROHIBITED TO APPLY A SIGNAL TO A
BUS TERMINAL WHEN IT IS IN OUTPUT MODE
AND WHEN A BUS THERMINAL IS FLOATING
(HIGH IMPEDANCE STATE), IT IS REQUESTED
TO FIX THE INPUT LEVEL BY MEANS OF
EXTERNAL PULL DOWN OR PULL UP
RESISTOR.
PIN CONNECTION (top view)
HCT245
HCT640
HCT643
October 1993
1/11


STMicroelectronics Electronic Components Datasheet

M54HCT640 Datasheet

OCTAL BUS TRANSCEIVER3-STATE: HCT245 NON INVERTING HCT640 INVERTING / HCT643 INVERTING/NON INVERTING

No Preview Available !

M54HCT640 pdf
M54/M74HCT245/640/643
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 3, 4, 5,
6, 7, 8, 9
18, 17, 16,
15, 14, 13,
12, 11
19
10
20
SYMBOL
DIR
A1 to A8
B1 to B8
G
GND
VCC
NAME AND FUNCTION
Directional Control
Data Inputs/Outputs
Data Inputs/Outputs
Output Enabel Input
(Active LOW)
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOLS
HCT245
H CT 64 0
HCT643
TRUTH TABLE
INPUT
G
L
L
H
X: ”H” or ”L”
Z: High impedance
DIR
L
H
X
FUNCTION
A BUS
B BUS
OUTPUT
INPUT
INPUT
OUTPUT
ZZ
HCT245
A=B
B=A
Z
OUTPUT
HCT640
A =B
B =A
Z
HCT643
A=B
B=A
Z
2/11


Part Number M54HCT640
Description OCTAL BUS TRANSCEIVER3-STATE: HCT245 NON INVERTING HCT640 INVERTING / HCT643 INVERTING/NON INVERTING
Maker ST Microelectronics
Total Page 11 Pages
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1 M54HCT640 OCTAL BUS TRANSCEIVER3-STATE: HCT245 NON INVERTING HCT640 INVERTING / HCT643 INVERTING/NON INVERTING ST Microelectronics
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2 M54HCT643 OCTAL BUS TRANSCEIVER3-STATE: HCT245 NON INVERTING HCT640 INVERTING / HCT643 INVERTING/NON INVERTING ST Microelectronics
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