M54HC7245/7640/7643/7645
M74HC7245/7640/7643/7645
OCTAL BUS TRANSCEIVER (3-STATE): HC7645 NON INVERTING
HC7640 INVERTING , HC7643 INVERTING/NON INVERTING
.
.
.
.
.
.
.
.
HIGH SPEED
t
PD
= 12 ns (TYP.) at V
CC
= 5V
LOW POWER DISSIPATION
o
I
CC
= 4
µA
(MAX.) at T
A
= 25 C
HIGH NOISE IMMUNITY
V
H
= 1.1 (TYP.) at V
CC
= 5V
OUTPUT DRIVE CAPABILITY
15 LSTTL LOADS
SYMMETRICAL OUTPUT IMPEDANCE
|I
OH
| = I
OL
= 6 mA (MIN)
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
WIDE OPERATING RANGE
V
CC
(OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS245/640/643
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCXXXXF1R
M74HCXXXXM1R
M74HCXXXXB1R
M74HCXXXXC1R
DESCRIPTION
The M54/74HC7245 HC7640, HC7643 and HC7645
utilise silicon gate C
2
MOS technology to achive
operating speeds equivalent to LSTTL devices.
Along with the low power dissipation and high noise
2
immunity of standads C MOS 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
PIN CONNECTION
(top view)
HC7640
HC7643
HC7645/HC7245
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.
HC7245 is electrically and funcutionally the same as the HC7645
January 1994
1/10
M54/M74HC7245/ 7640/7643/7645
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
or I
GND
P
D
T
stg
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Source Sink Current Per Output Pin
DC V
CC
or Ground Current
Power Dissipation
Storage Temperature
Lead Temperature (10 sec)
Parameter
Value
-0.5 to +7
-0.5 to V
CC
+ 0.5
-0.5 to V
CC
+ 0.5
±
20
±
20
±
35
±
70
500 (*)
-65 to +150
300
Unit
V
V
V
mA
mA
mA
mA
mW
o
o
C
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW:
≅
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
T
op
Parameter
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature:
M54HC
Series
M74HC
Series
Value
2 to 6
0 to V
CC
0 to V
CC
-55 to +125
-40 to +85
Unit
V
V
V
C
o
C
o
3/10
M54/M74HC7245/ 7640/7643/7645
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Test Conditions
Symbol
Parameter
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
t
PZL
t
PZH
t
PLZ
t
PHZ
C
IN
C
OUT
C
PD
(*)
Output Enable
Time
Output Disable
Time
Input Capacitance
Output
Capacitance
Power Dissipation
Capacitance
2.0
4.5
6.0
2.0
4.5
6.0
R
L
= 1 KΩ
R
L
= 1 KΩ
T
A
= 25 C
54HC and 74HC
Min. Typ. Max.
25
7
6
61
15
13
77
19
16
84
21
18
5
60
12
10
125
25
21
150
30
26
150
30
26
10
o
Value
-40 to 85
o
C -55 to 125
o
C
74HC
54HC
Min. Max. Min. Max.
75
15
13
156
31
27
188
38
32
188
38
32
10
90
18
15
190
38
32
225
45
38
225
45
38
10
ns
pF
pF
pF
ns
ns
ns
Unit
t
TLH
t
THL
t
PLH
t
PHL
Output Transition
Time
Propagation
Delay Time
(*) C
PD
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
(Refer to Test Circuit). Average operting current can be obtained by the following equation. I
CC
(opr) = C
PD
•V
CC
•f
IN
+ I
CC
/4 (per Gate)
SWITCHING CHARACTERISTICS TEST WAVEFORM
V
CC
GND
V
CC
GND
5/10
stm32/stm8
京公网安备 11010802033920号
EEWORLD
