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STMicroelectronics Electronic Components Datasheet

M74HC7643 Datasheet

OCTAL BUS TRANSCEIVER (3-STATE):HC7645 NONINVERTING HC7640 INVERTING /HC7643 INVERTING/NONINVERTING

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M74HC7643 pdf
M54HC7245/7640/7643/7645
M74HC7245/7640/7643/7645
OCTAL BUS TRANSCEIVER (3-STATE): HC7645 NON INVERTING
HC7640 INVERTING , HC7643 INVERTING/NON INVERTING
. HIGH SPEED
tPD = 12 ns (TYP.) at VCC = 5V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) at TA = 25 oC
. HIGH NOISE IMMUNITY
VH = 1.1 (TYP.) at VCC = 5V
. OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
|IOH| = IOL = 6 mA (MIN)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. WIDE OPERATING RANGE
VCC (OPR) = 2V to 6V
. 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 :
M54HCXXXXF1R M74HCXXXXM1R
M74HCXXXXB1R M74HCXXXXC1R
The M54/74HC7245 HC7640, HC7643 and HC7645
utilise silicon gate C2MOS technology to achive
operating speeds equivalent to LSTTL devices.
Along with the low power dissipation and high noise
immunity of standads C2MOS 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.
The HC7245/640/7643/7645 have the same pin
configuration and function as the HC245/640/643
and they have a hysteresis characteristics with each
input, so HC7245/7640/7643/7645 can be used as a
line receiver, etc. All input are equipped with
protection circuits against static discharge and
transient excess voltage.
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)
HC7640
HC7643
HC7 645/ HC 72 45
HC7245 is electrically and funcutionally the same as the HC7645
January 1994
1/10


STMicroelectronics Electronic Components Datasheet

M74HC7643 Datasheet

OCTAL BUS TRANSCEIVER (3-STATE):HC7645 NONINVERTING HC7640 INVERTING /HC7643 INVERTING/NONINVERTING

No Preview Available !

M74HC7643 pdf
M54/M74HC7245/7640/7643/7645
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
HC7640
HC7643
HC7645
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
HC7640
A=B
B=A
Z
OUTPUT
HC7643
A=B
B =A
Z
HC7645/7245
A=B
B=A
Z
2/10


Part Number M74HC7643
Description OCTAL BUS TRANSCEIVER (3-STATE):HC7645 NONINVERTING HC7640 INVERTING /HC7643 INVERTING/NONINVERTING
Maker ST Microelectronics
Total Page 10 Pages
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