Motorola MC74F623J, MC74F623N, MC74F620N, MC74F620DW, MC74F623DW Datasheet
4-233
FAST AND LS TTL DATA
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
(INVERTING AND NONINVERTING)
The MC74F620 is an octal bus transceiver featuring inverting 3-state buscompatible outputs in both send and receive directions. The BN outputs are
capable of sinking 64 mA and sourcing up to 15 mA, providing very good capacitive drive characteristics. The MC74F623 is a non-inverting version of the
MC74F620. These octal bus transceivers are designed for asynchronous
two-way communication between data busses. 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 B bus to A bus, depending
upon the logic levels at the Enable inputs (OEBA
and OEAB). The Enable inputs can be used to disable the device so that the busses are effectively isolated. The dual-enable configuration gives the MC74F620 and MC74F623 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
at their last states.
• High Impedance NPN base inputs for reduced loading (70 µA in High
and Low states)
• Ideal for Applications which Require High Output drive and minimal
bus loading
• Octal Bidirectional Bus Interface
• 3-State Buffer Outputs Sink 64 mA and Source 15 mA
• – F620 Inverting
– F623 Noninverting
• ESD Protection > 4000 Volts
F620
18 17 16 15 14 13
1 2 3 4 5 6
7
20 19
8
V
CC
OEAB
OEBA
B0B1B
2
B
4
B
3
B
5
A0A1A2A3A4A5A
6
9 10
A7GND
12 11
B6B
7
F623
18 17 16 15 14 13
1 2 3 4 5 6
7
20 19
8
V
CC
OEAB
OEBA
B0B1B
2
B
4
B
3
B
5
A0A1A2A3A4A5A
6
9 10
A7GND
12 11
B6B
7
PIN ASSIGNMENTS
MC74F620
MC74F623
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
(INVERTING AND NONINVERTING)
FAST SCHOTTKY TTL
ORDERING INFORMATION
MC74FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXDW SOIC
20
1
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
20
1
DW SUFFIX
SOIC
CASE 751D-03
4-234
FAST AND LS TTL DATA
MC74F620 • MC74F623
A0A1A2A3A4A5A6A
7
B0B1B2B3B4B5B6B
7
OEAB
OEBA
A0A1A2A3A4A5A6A
7
B0B1B2B3B4B5B6B
7
OEAB
OEBA
F620 F623
LOGIC SYMBOLS
2 3 4 5 6 7 8 9
1
19
1112131415161718
1112131415161718
1
19
2 3 4 5 6 7 8 9
FUNCTION TABLE
Inputs Operating Modes
OEBA OEAB F620 F623
L L B data to A bus B data to A bus
H H A data to B bus A data to B bus
H L Z Z
L H
B data to A bus
A
data to B bus
B data to A bus
A data to B bus
H = HIGH voltage level: L = LOW voltage level: X = Don’t care: Z = High impedance “off” state
GUARANTEED OPERATING RANGES
Limits
Symbol Parameter Min Typ Max Unit
V
CC
DC Supply Voltage 74 4.5 5.0 5.5 V
T
A
Operating Ambient Temperature Range 74 0 25 70 °C
I
OH
Output Current High An Outputs 74 — — –3.0 mA
I
OH
Output Current High Bn Outputs 74 — — –15 mA
I
OL
Output Current Low An Outputs 74 — — 24 mA
I
OL
Output Current Low Bn Outputs 74 — — 64 mA
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