Philips Semiconductors
Product specification
Transceivers
74F620 Octal Bus Transceiver, Inverting (3-State)
74F623 Octal Bus Transceiver, Non-Inverting (3-State)
FEATURES
74F620/74F623
•
High-impedance NPN base inputs for reduced loading
(70µA in High and Low states)
Enable inputs (OEBA and OEAB). The Enable inputs can be used to
disable the device so that the buses are effectively isolated.
The dual-enable configuration gives the 74F620 and 74F623 the
capability to store data by the simultaneous enabling of OEBA and
OEAB. Each output reinforces its input in this transceiver
configuration. Thus, when both control inputs are enabled and all
other data sources to the two sets of the bus lines are at high
impedance, both sets of bus lines (16 in all) will remain in their last
states.
TYPICAL
PROPAGATION
DELAY
3.5ns
4.5ns
TYPICAL SUPPLY CURRENT
(TOTAL)
80mA
105mA
•
Ideal for applications which require high output drive and minimal
bus loading
•
Octal bidirectional bus interface
•
3-State buffer outputs sink 64mA and source 15mA
•
74F620, inverting
•
74F623, non-inverting
DESCRIPTION
The 74F620 is an octal transceiver featuring inverting 3-State
bus-compatible outputs in both send and receive directions. The
outputs are capable of sinking 64mA and sourcing up to 15mA,
providing very good capacitive drive characteristics. The 74F623 is
a non-inverting version of the 74F620.
These octal bus transceivers are designed for asynchronous
two-way communication between data buses. The control function
implementation allows for maximum flexibility in timing.
These devices allow data transmission from the A bus to the B bus
or from the B bus to the A bus depending upon the logic levels at the
TYPE
74F620
74F623
ORDERING INFORMATION
DESCRIPTION
20-pin plastic DIP
20-pin plastic SOL
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
N74F620N, N74623N
N74F620D, N74623D
PKG DWG #
SOT146-1
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
A0 - A7, B0 - B7
OEBA, OEAB
A0 - A7
B0 - B7
Data inputs
Output Enable inputs
Data outputs
Data outputs
DESCRIPTION
74F(U.L.)
HIGH/LOW
3.5/1.16
1.0/0.033
150/40
750/106.7
LOAD VALUE
HIGH/LOW
70µA/70µA
20µA/20µA
3mA/24mA
15mA/64mA
NOTE:
One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
PIN CONFIGURATION – 74F620
OEAB
1
20
19
18
17
16
15
14
13
12
11
V
CC
OEBA
B0
B1
B2
B3
B4
B5
B6
B7
PIN CONFIGURATION – 74F623
OEAB
1
20
19
18
17
16
15
14
13
12
11
V
CC
OEBA
B0
B1
B2
B3
B4
B5
B6
B7
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND 10
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
GND 10
SF01124
SF01124
1990 Apr 6
2
853–0379 96249
Philips Semiconductors
Product specification
Transceivers
74F620/74F623
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
O
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
A0–A7
Current applied to output in Low output state
B0–B7
Operating free-air temperature range
Storage temperature range
128
0 to +70
–65 to +150
mA
°C
°C
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to +V
CC
48
UNIT
V
V
mA
V
mA
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
V
CC
V
IH
V
IL
I
IK
I
O
OH
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
A0–A7
High-level
High level output current
B0–B7
A0–A7
I
O
OL
T
amb
Low-level
Low level output current
B0–B7
Operating free-air temperature range
0
64
70
mA
°C
–15
24
mA
mA
PARAMETER
MIN
4.5
2.0
0.8
–18
–3
NOM
5.0
MAX
5.5
V
V
V
mA
mA
UNIT
1990 Apr 6
5
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