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PDF M74HC646 Data sheet ( Hoja de datos )
| Número de pieza | M74HC646 | |
| Descripción | HC648 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE / INV. HC646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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M74HC646
M74HC648
HC646 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE)
HC648 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE, INV.)
. 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
B1R
(Plastic Package)
M1R
(Micro Package)
ORDER CODES :
M74HCXXXM1R M74HCXXXB1R
DESCRIPTION
The M74HC646/648 are high speed CMOS OCTAL
BUS TRANSCEIVERS AND REGISTERS, (3-
STATE) fabricated in silicon gate C2MOS 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
PIN CONNECTIONS (top view)
INPUT AND OUTPUT EQUIVALENT CIRCUIT
GAB, GAB, CAB,
SAB, SBA, CBA
A, B
October 1993
1/12
1 page  
M74HC646/648
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC Supply Voltage
-0.5 to +7
V
VI DC Input Voltage
-0.5 to VCC + 0.5
V
VO DC Output Voltage
-0.5 to VCC + 0.5
V
IIK DC Input Diode Current
IOK DC Output Diode Current
IO DC Output Source Sink Current Per Output Pin
± 20 mA
± 20 mA
± 35 mA
ICC or IGND DC VCC or Ground Current
± 70 mA
PD Power Dissipation
500 (*)
mW
Tstg Storage Temperature
-65 to +150
oC
TL Lead Temperature (10 sec)
300 oC
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW: ≅ 65 oC derate to 300 mW by 10mW/oC: 65 oC to 85 oC
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
VO
Top
tr, tf
Parameter
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Input Rise and Fall Time
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
Value
2 to 6
0 to VCC
0 to VCC
-40 to +85
0 to 1000
0 to 500
0 to 400
Unit
V
V
V
oC
ns
5/12
5 Page 
DIM.
A
a1
a2
b
b1
C
c1
D
E
e
e3
F
L
S
MIN.
0.10
0.35
0.23
15.20
10.00
7.40
0.50
SO24 MECHANICAL DATA
mm
TYP.
0.50
1.27
13.97
MAX.
2.65
0.20
2.45
0.49
0.32
MIN.
0.004
0.013
0.009
45° (typ.)
15.60
0.598
10.65
0.393
7.60 0.291
1.27 0.19
8° (max.)
L
M74HC646/648
inch
TYP.
0.020
0.05
0.55
MAX.
0.104
0.007
0.096
0.019
0.012
0.614
0.420
0.299
0.050
c1
b
24
e3
D
e
13
s
E
1 12
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet M74HC646.PDF ] | |
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