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MC74F620

OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS (INVERTING AND NONINVERTING)

Motorola => Freescale 

OCTAL BUS TRANSCEIVER

WITH 3-STATE OUTPUTS

(INVERTING AND NONINVERTING)

The MC74F620 is an octal bus transceiver featuring inverting 3-state bus-

compatible 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 ca-

pacitive 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 imple-

mentation 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 in-

puts can be used to disable the device so that the busses are effectively iso-

lated. 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

MC74F620

MC74F623

OCTAL BUS TRANSCEIVER

WITH 3-STATE OUTPUTS

(INVERTING AND NONINVERTING)

FAST™ SCHOTTKY TTL

20

1

20

1

20

1

J SUFFIX

CERAMIC

CASE 732-03

N SUFFIX

PLASTIC

CASE 738-03

DW SUFFIX

SOIC

CASE 751D-03

ORDERING INFORMATION

MC74FXXXJ Ceramic

MC74FXXXN Plastic

MC74FXXXDW SOIC

PIN ASSIGNMENTS

VCC OEBA B0 B1 B2 B3 B4 B5 B6 B7

20 19 18 17 16 15 14 13 12 11

VCC OEBA B0 B1 B2 B3 B4 B5 B6 B7

20 19 18 17 16 15 14 13 12 11

F620

F623

1 2 3 4 5 6 7 8 9 10

OEAB A0 A1 A2 A3 A4 A5 A6 A7 GND

1 2 3 4 5 6 7 8 9 10

OEAB A0 A1 A2 A3 A4 A5 A6 A7 GND

FAST AND LS TTL DATA

4-233

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