Motorola MC74F1245J, MC74F1245N, MC74F1245DW Datasheet
4-264
FAST AND LS TTL DATA
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 3-STATE
INPUTS/OUTPUTS
The MC74F1245 contains eight noninverting bidirectional buffers with
3-state outputs and is intended for bus-oriented applications. Current sinking
capability is 24 mA at the A ports and 64 mA at the B ports. The Transmit/
Receive (T/R
) input determines the direction of data flow through the bidirectional transceiver. Transmit (active HIGH) enables data from A ports to B
ports; Receive (active LOW) enables data from B ports to A ports. The Output
Enable input, when HIGH, disables both A and B ports by placing them in a
high-Z condition.
• Noninverting Buffers
• Bidirectional Data Path
• B Outputs Sink 64 mA
• High Impedance Inputs for Reduced Loading
• Same Function and Pinout as the F245
• ESD Protection > 4000 Volts
PIN ASSIGNMENT
LOGIC SYMBOL
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
T/R
A0A1A2A3A4A5A6A
7
B0B1B2B3B4B5B6B
7
OE
2 3 4 5 6 7 8 9
19
1
18 17 16 15 14 13 12 11
GUARANTEED OPERATING RANGES
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
OL
Output Current Low An Outputs 74 — — 24 mA
I
OH
Output Current High Bn Outputs 74 — — –15 mA
I
OL
Output Current Low Bn Outputs 74 — — 64 mA
MC74F1245
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH 3-STATE
INPUTS/OUTPUTS
FAST SCHOTTKY TTL
ORDERING INFORMATION
MC74FXXXXJ Ceramic
MC74FXXXXN Plastic
MC74FXXXXDW 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
4-265
FAST AND LS TTL DATA
MC74F1245
FUNCTION TABLE
Inputs
Inputs/Outputs
OE T/R A
n
B
n
L L A = B Inputs
L H Inputs B = A
H X Z Z
H = HIGH voltage level: L = LOW voltage level: X = Don’t care: Z = HIGH impedance “off” state.
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
2 3 4 5 6 7 8 9
1112131415161718
1
19
OE
T/R
VCC = PIN 20
GND = PIN 10
LOGIC DIAGRAM
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