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M74HC646 Fiches technique(PDF) 1 Page - STMicroelectronics

No de pièce M74HC646
Description  HC648 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV. HC646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC646 Fiches technique(HTML) 1 Page - STMicroelectronics

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M74HC646
M74HC648
October 1993
HC648 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE, INV.)
HC646 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE)
B1R
(Plastic Package)
ORDER CODES :
M74HCXXXM1R
M74HCXXXB1R
M1R
(Micro Package)
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN CONNECTIONS (top view)
GAB, GAB, CAB,
A, B
SAB, SBA, CBA
.
HIGH SPEED
fMAX = 73 MHz (TYP.) AT VCC =5 V
.
LOW POWER DISSIPATION
ICC =4
µA (MAX.) AT TA =25 °C
.
HIGH NOISE IMMUNITY
VNIH =VNIL =28 % VCC (MIN.)
.
OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
IOH=IOL = 6 mA (MIN.)
.
BALANCED PROPAGATION DELAYS
tPLH =tPHL
.
WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS646/648
DESCRIPTION
The M74HC646/648 are high speed CMOS OCTAL
BUS TRANSCEIVERS AND REGISTERS, (3-
STATE) fabricated in silicon gate C
2MOS technol-
ogy. They have the same high speed performance
of LSTTL combined with true CMOS low power con-
sumption.
These devices consist of bus transceiver circuits
with 3-state output, D-type flip-flops, and control cir-
cuitry arranged for multiplexed transmission of data
directly from the input bus or from the internal reg-
isters. Data on the A or B bus will be clocked into the
registers on the low-to-high transition of the appro-
priate clock pin (Clock AB - or Clock BA). Enable (G)
and direction (DIR) pins are provided to control the
transceiver functions. In the transceiver mode, data
present at the high-impedance port may be stored
in either register or in both.
The select controls (Select AB select BA) can multi-
plex stored and real-time (transparent mode) data.
The direction control determines which bus will re-
ceive data when enable G is active (low).
In the isolation mode (enable G high), ”A” data may
be stored in one register and/or ”B” data may be
stored in the other register. When an output function
is disabled, the input function is still enabled and
may be used to store and transmit data. Only one
of the two buses, A or B, may be driven at a time.
All inputs are equipped with protection circuits
1/12


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