M54/74HC245/640/643
M54/74HC245/640/643
October 1993
HC640 INVERTING, HC643 INVERTING/NON INVERTING
OCTAL BUS TRANSCEIVER (3-STATE): HC245 NON INVERTING
B1R
(Plastic Package)
ORDER CODES :
M54HCXXXF1R
M74HCXXXM1R
M74HCXXXB1R
M74HCXXXC1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTION (top view)
.
HIGH SPEED
t
PD
= 10 ns (TYP.) at V
CC
= 5V
.
LOW POWER DISSIPATION
I
CC
= 4
A (MAX.) at T
A
= 25
o
C
.
HIGH NOISE IMMUNITY
V
NIH
= V
INL
= 28 % V
CC
(MIN.)
.
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 VOLTAGE RANGE
V
CC
(OPR) = 2 V TO 6 V
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS245/640/643
DESCRIPTION
The M54/74HC245, HC640 and HC643 utilise
silicon gate C2MOS technology to achive operating
speeds equivalent to LSTTL devices.
Along with the low power dissipation and high noise
immunity of standards C
2
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.
All input are equipped with protection circuits
against static discharge and transient 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.
HC245
HC640
HC643
1/11
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1
DIR
Directional Control
2, 3, 4, 5,
6, 7, 8, 9
A1 to A8
Data Inputs/Outputs
18, 17, 16,
15, 14, 13,
12, 11
B1 to B8
Data Inputs/Outputs
19
G
Output Enabel Input
(Active LOW)
10
GND
Ground (0V)
20
V
CC
Positive Supply Voltage
IEC LOGIC SYMBOLS
TRUTH TABLE
INPUT
FUNCTION
OUTPUT
G
DIR
A BUS
B BUS
HC245
HC640
HC643
L
L
OUTPUT
INPUT
A = B
A = B
A = B
L
H
INPUT
OUTPUT
B = A
B = A
B = A
H
X
Z
Z
Z
Z
Z
X: "H" or "L"
Z: High impedance
HC245
HC640
HC643
M54/M74HC245/640/643
2/11
LOGIC DIAGRAM (HC640)
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7
V
V
I
DC Input Voltage
-0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Source Sink Current Per Output Pin
35
mA
I
CC
or I
GND
DC V
CC
or Ground Current
70
mA
P
D
Power Dissipation
500 (*)
mW
T
stg
Storage Temperature
-65 to +150
o
C
T
L
Lead Temperature (10 sec)
300
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
(*) 500 mW:
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
NOTE: IN CASE OF HC245 OR HC643, INPUT INVERTERS MARKED* AT A BUS AND B BUS ARE ELIMINATED RESPECTIVELY
M54/M74HC245/640/643
3/11
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Symbol
Parameter
Test Conditions
Value
Unit
V
CC
(V)
C
L
(pF)
T
A
= 25
o
C
54HC and 74HC
-40 to 85
o
C
74HC
-55 to 125
o
C
54HC
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
TLH
t
THL
Output Transition
Time
2.0
50
25
60
75
90
ns
4.5
7
12
19
18
6.0
6
10
13
15
t
PLH
t
PHL
Propagation
Delay Time
2.0
50
33
90
115
135
ns
4.5
12
18
23
27
6.0
10
15
20
23
2.0
150
48
120
150
180
ns
4.5
16
24
30
36
6.0
14
20
26
31
t
PZL
t
PZH
Output Enable
Time
2.0
50
R
L
= 1K
48
150
190
225
ns
4.5
16
30
38
45
6.0
14
26
32
38
2.0
150
R
L
= 1K
63
180
225
270
ns
4.5
21
36
45
54
6.0
18
31
38
46
t
PLZ
t
PHZ
Output Disable
Time
2.0
50
R
L
= 1K
37
150
190
225
ns
4.5
17
30
38
45
6.0
15
26
32
38
C
IN
Input Capacitance
DIR, G
5
10
10
10
pF
C
I/OUT
Output
Capacitance
An, Bn
13
pF
C
PD
(*)
Power Dissipation
Capacitance
HC245
HC640/643
39
37
pF
(*) 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
/8 (per circuit)
M54/M74HC245/640/643
5/11
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