Motorola MC74F640DW, MC74F640J, MC74F640N Datasheet
For:char
Printed on:Mon, Feb 6, 1995 09:51:45
From book:DL121CH4 (5) VIEW
Document:MC74F640 (5) VIEW
Last saved on:Fri, Feb 3, 1995 16:10:59
H = High Voltage Level
L = Low Voltage Level
X = Don’t Care
Z = High Impedance “Off” State
4-238
FAST AND LS TTL DATA
OCTAL BUS TRANSCEIVER,
INVERTING WITH 3-STATE OUTPUTS
The MC74F640 is an octal transceiver featuring inverting 3-state bus compatible outputs in both transmit and receive directions. The B port outputs are
capable of sinking 64 mA and sourcing 15 mA, providing very good capacitive
drive characteristics. The device features an Output Enable (OE
) input for
easy cascading and Transmit/Receive (T/R
) input for direction control. The
3-state outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.
• 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
• Inverting Version of F245
• Octal Bidirectional Bus Interface
• 3-State Buffer Outputs Sink 64 mA and Source 15 mA
• ESD Sensitive — 4000 V HBM
PIN ASSIGNMENT
18 17 16 15 14 13
1 2 3 4 5 6
7
20 19
8
V
CC
T/R
OE B0B1B
2
B
4
B
3
B
5
A0A1A2A3A4A5A
6
9 10
A7GND
12 11
B6B
7
FUNCTION TABLE
Inputs
OE T/R
Outputs
L
L
H
L
H
X
Bus B data to Bus A
Bus A data to Bus B
Z
MC74F640
OCTAL BUS TRANSCEIVER,
INVERTING WITH
3-STATE OUTPUTS
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
LOGIC SYMBOL
A0A1A2A3A4A5A6A
7
B0B1B2B3B4B5B6B
7
T/R
OE
2 3 4 5 6 7 8 9
1112131415161718
1
19
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