MC74F646 Ver la hoja de datos (PDF) - Motorola => Freescale
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MC74F646 Datasheet PDF : 6 Pages
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OCTAL TRANSCEIVER/REGISTER
WITH 3-STATE OUTPUTS
These devices consist of bus transceiver circuits with 3-state 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 the B register or in both. The
select controls can multiplex stored and real-time (transparent mode) data.
The direction control determines which bus will receive data when the enable
OE is Active LOW. In the isolation mode (OE HIGH), A data may be stored
in the B register and/or B data may be stored in the A register.
• Independent Registers for A and B
• Multiplexed Real-Time and Stored Data
• Choice of True (F646) and Inverting (F648) Data Paths
• 3-State Outputs
PIN ASSIGNMENTS
VCC CPBA SBA OE B0 B1 B2 B3 B4 B5 B6 B7
24 23 22 21 20 19 18 17 16 15 14 13
F646
MC54/74F646
MC54/74F648
OCTAL TRANSCEIVER/REGISTER
WITH 3-STATE OUTPUTS
FAST™ SCHOTTKY TTL
24
1
24
1
J SUFFIX
CERAMIC
CASE 758-01
N SUFFIX
PLASTIC
CASE 724-03
1 2 3 4 5 6 7 8 9 10 11 12
CPAB SAB DIR A0 A1 A2 A3 A4 A5 A6 A7 GND
VCC CPBA SBA OE B0 B1 B2 B3 B4 B5 B6 B7
24 23 22 21 20 19 18 17 16 15 14 13
24
1
DW SUFFIX
SOIC
CASE 751E-03
F648
1 2 3 4 5 6 7 8 9 10 11 12
CPAB SAB DIR A0 A1 A2 A3 A4 A5 A6 A7 GND
LOGIC SYMBOLS
4 5 6 7 8 9 10 11
ORDERING INFORMATION
MC54FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXDW SOIC
4 5 6 7 8 9 10 11
1
CPAB A0 A1 A2 A3 A4 A5 A6 A7
2
SAB
3
DIR
23
CPBA
F646
22
SBA
21
OE B0 B1 B2 B3 B4 B5 B6 B7
1
CPAB A0 A1 A2 A3 A4 A5 A6 A7
2
SAB
3
DIR
23
CPBA
F648
22
SBA
21
OE B0 B1 B2 B3 B4 B5 B6 B7
20 19 18 17 16 15 14 13
20 19 18 17 16 15 14 13
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
FAST AND LS TTL DATA
4-241
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