Philips Semiconductors
Product specification
Octal transceivers/registers (open-collector)
74F647 Octal Transceiver/Register, Non-inverting (Open Collector)
74F649 Octal Transceiver/Register, Inverting (Open Collector)
FEATURES
74F647/74F649
•
High impedance NPN base inputs for reduced loading
(20µA in High and Low states)
•
Independent registers for A and B buses
•
Multiplexed real-time and stored data
•
Choice of non-inverting and inverting data paths
•
Open Collector outputs
•
300 mil wide 24-pin Slim Dip package
DESCRIPTION
The 74F647 and 74F649 Transceivers/Registers consist of bus
transceiver circuits with open-collector outputs, D-type flip-flops, and
control circuitry arranged for multiplexed transmission of data
directly from the input bus or from the internal registers. Data on the
A or B bus will be clocked into the registers as the appropriate clock
pin goes to a High logic level. Output Enable (OE) and DIR pins are
provided to control the transceiver function. In the transceiver mode,
data present at the high impedance port may be stored in either the
A or B register or both.
The select (SAB, SBA) controls can multiplex stored and real-time
(transparent mode) data. The DIR determines which bus will receive
data when the Output Enable, OE is active Low. In the isolation
mode (Output Enable, OE = High), data from Bus A may be stored
in the B register and/or data from Bus B may be stored in the A
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. The following
examples demonstrate the four fundamental bus-management
functions that can be performed with the 74F647 and 74F649.
TYPICAL
f
max
65MHz
65MHz
TYPICAL SUPPLY CURRENT
(TOTAL)
125mA
125mA
TYPE
74F647
74F649
ORDERING INFORMATION
DESCRIPTION
24-pin plastic Slim
DIP (300mil)
24-pin plastic SOL
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
N74F647N, N74F649N
N74F647D, N74F649D
PKG DWG #
SOT222-1
SOT137-1
PIN CONFIGURATION – 74F647
CPAB 1
SAB 2
DIR
3
24 V
CC
23 CPBA
22 SBA
21 OE
20 B0
19 B1
18 B2
17 B3
16 B4
15 B5
14 B6
13 B7
PIN CONFIGURATION – 74F649
CPAB 1
SAB 2
DIR
3
24 V
CC
23 CPBA
22 SBA
21 OE
20 B0
19 B1
18 B2
17 B3
16 B4
15 B5
14 B6
13 B7
A0 4
A1 5
A2 6
A3 7
A4 8
A5 9
A6 10
A7 11
GND 12
A0 4
A1 5
A2 6
A3 7
A4 8
A5 9
A6 10
A7 11
GND 12
SF01196
SF01196
1992 Feb 28
2
853-0876 05853
Philips Semiconductors
Product specification
Octal transceivers/registers (open-collector)
74F647/74F649
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
A0 - A7
B0 - B7
CPAB
CPBA
SAB
SBA
DIR
OE
A0 - A7
A inputs
B inputs
A-to-B clock input
B-to-A clock input
A-to-B select input
B-to-A select input
Data flow Directional control enable input
Output Enable input
A outputs
DESCRIPTION
74F(U.L.)
HIGH/LOW
1.0/0.033
1.0/0.033
1.0/0.033
1.0/0.033
1.0/0.033
1.0/0.033
1.0/0.066
1.0/0.066
OC/106.7
LOAD VALUE
HIGH/LOW
20µA/20µA
20µA/20µA
20µA/20µA
20µA/20µA
20µA/20µA
20µA/20µA
20µA/20µA
20µA/20µA
OC/64mA
OC/64mA
B0 - B7
B outputs
OC/106.7
NOTE:
One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state. OC = Open Collector
FUNCTION TABLE
INPUTS
OE
X
X
H
H
L
L
L
L
=
=
=
=
=
DIR
X
X
X
X
L
L
CPAB
↑
X
↑
H or L
X
X
CPBA
X
↑
↑
H or L
X
H or L
SAB
X
X
X
X
X
X
SBA
X
X
X
X
L
H
Input
Unspecified*
Input
Output
DATA I/O
A0-A7
B0-B7
Unspecified*
Input
Input
Input
Store A, B unspecified*
Store B, A unspecified*
Store A and B data
Isolation, hold storage
Real time B data to A bus
Stored B data to A bus
Store A, B unspecified*
Store B, A unspecified*
Store A and B data
Isolation, hold storage
Real time B data to A bus
Stored B data to A bus
OPERATING MODE
H
L
X
↑
*
H
H or L
X
L
X
Input
Output
Real time A data to B bus Real time A data to B bus
H
X
X
H
X
Stored A data to B bus
Stored A data to B bus
High voltage level
Low voltage level
Don’t care
Low-to-High clock transition
The data output function may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always
enabled, i.e., data at the bus pins will be stored on every Low-to-High transition of the clock.
LOGIC DIAGRAM – 74F647
OE
DIR
CPBA
SBA
CPAB
SAB
21
3
23
22
1
2
LOGIC DIAGRAM – 74F649
OE
DIR
CPBA
SBA
CPAB
SAB
21
3
23
22
1
2
1 of 8 Channels
1D
C1
4
A0
1D
C1
20
B0
4
1 of 8 Channels
1D
C1
A0
20
1D
C1
B0
To 7 other channels
SF01202
To 7 other channels
SF01203
1992 Feb 28
4
Philips Semiconductors
Product specification
Octal transceivers/registers (open-collector)
74F647/74F649
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to +V
CC
128
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
V
CC
V
IH
V
IL
I
IK
V
OH
I
OL
T
amb
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output voltage
Low-level output current
Operating free-air temperature range
0
PARAMETER
MIN
4.5
2.0
0.8
–18
4.5
64
70
NOM
5.0
MAX
5.5
V
V
V
mA
V
mA
°C
UNIT
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
I
OH
V
O
OL
V
I
I
I
I
IH
I
IL
I
CC
PARAMETER
High-level output current
Low level output voltage
Low-level
Input clamp voltage
Input current at
In ut
maximum input voltage
High-level input current
Low-level input current
Supply current (total)
I
CCH
I
CCL
Others
An, Bn
TEST CONDITIONS
1
V
CC
= MIN, V
IL
= MAX,
V
IH
= MIN, V
OH
= MAX
V
CC
= MIN,
V
IL
= MAX
V
IH
= MIN,
I
OL
= 48mA
I
OL
= 64mA
V
CC
= MIN, I
I
= I
IK
V
CC
= 0.0, V
I
= 7.0V
V
CC
= 5.5V, V
I
= 5.5V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.5V
V
CC
= MAX
105
145
±10%V
CC
±5%V
CC
0.38
0.42
–0.73
LIMITS
MIN
TYP
2
MAX
250
0.55
0.55
–1.2
100
1
20
–20
145
200
µA
V
V
V
µA
mA
µA
µA
mA
mA
UNIT
NOTES:
1. For conditions shown as MIN or Max, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25
°
C.
1992 Feb 28
5
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