INTEGRATED CIRCUITS
74F545
Octal bidirectional transceiver (with 3-State inputs/outputs)
Product specification |
1990 Mar 01 |
IC15 Data Handbook
m n r
Philips Semiconductors |
Product specification |
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Octal bidirectional transceiver (with 3-State inputs/outputs) |
74F545 |
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FEATURES
•High impedance NPN base inputs for reduced loading (70μA in High and Low states) output
•8-bit bidirectional data flow reduces system package count
•3-State inputs/outputs for interfacing with bus oriented systems
•24mA and 64mA bus drive capability on A and B ports, respectively
•Transmit/Receive and Output Enable simplify control logic
DESCRIPTION
The 74F545 is an 8-bit, 3-State, high speed transceiver. It provides bidirectional drive for the bus-oriented microprocessor and digital communications systems. Straight through bidirectional transceivers are featured, with 24mA bus drive capability on the A ports and 64mA bus drive capability on the B ports. One input, Transmit/Receive (T/R) determines the direction of logic signals through the bidirectional transceiver. Transmit enables data from A ports to B ports; Receive enables data from B ports to A ports. The Output Enable input disables both A and B ports by placing them in a 3-State condition. The 74F545 performs the same function as the
74F245, the only difference being package pin assignment.
PIN CONFIGURATION
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A0 |
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VCC |
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1 |
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20 |
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A1 |
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B0 |
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2 |
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19 |
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A2 |
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3 |
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18 |
B1 |
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A3 |
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4 |
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17 |
B2 |
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A4 |
5 |
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16 |
B3 |
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A5 |
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B4 |
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6 |
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15 |
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A6 |
7 |
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14 |
B5 |
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A7 |
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8 |
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13 |
B6 |
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OE |
9 |
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12 |
B7 |
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GND |
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10 |
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11 |
T/R |
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SF01032 |
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TYPICAL |
TYPICAL SUPPLY |
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TYPE |
CURRENT |
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PROPAGATION DELAY |
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(TOTAL) |
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74F545 |
4.0ns |
87mA |
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ORDERING INFORMATION |
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DESCRIPTION |
COMMERCIAL |
PKG DWG # |
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RANGE |
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VCC = 5V ±10%, |
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Tamb = 0°C to +70°C |
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20-Pin Plastic DIP |
N74F545N |
SOT146-1 |
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20-Pin Plastic SOL |
N74F545D |
SOT163-1 |
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INPUT AND OUTPUT LOADING AND FAN-OUT TABLE |
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PINS |
DESCRIPTION |
74F(U.L.) |
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LOAD VALUE |
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HIGH/LOW |
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HIGH/LOW |
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A0±A7, B0±B7 |
Data inputs |
3.5/0.117 |
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70μA/70μA |
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Output Enable input (active Low) |
2.0/0.067 |
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40μA/40μA |
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OE |
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Transmit/Receive input |
2.0/0.067 |
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40μA/40μA |
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T/R |
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A0 - A7 |
Port A 3-State outputs |
150/40 |
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3.0mA/24mA |
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B0 - B7 |
Port B 3-State outputs |
750/107 |
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15mA/64mA |
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NOTE: One (1.0) FAST Unit Load is defined as: 20μA in the High state and 0.6mA in the Low state.
1990 Mar 01 |
2 |
853±0375 98992 |
Philips Semiconductors |
Product specification |
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Octal bidirectional transceiver (with 3-State inputs/outputs) |
74F545 |
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LOGIC SYMBOL |
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LOGIC SYMBOL (IEEE/IEC) |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
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9 |
G3 |
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3EN1 |
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A0 |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
11 |
3EN2 |
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9 |
OE |
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11 |
T/R |
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1 |
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1 |
2 |
19 |
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B0 |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
B7 |
2 |
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18 |
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3 |
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17 |
VCC = Pin 20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
4 |
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16 |
GND = Pin 10 |
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SF01033 |
5 |
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15 |
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6 |
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14 |
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7 |
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13 |
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8 |
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12 |
SF01034
LOGIC DIAGRAM
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A0 |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
OE |
9 |
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T/R |
11 |
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19 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
VCC = |
Pin 20 |
B0 |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
B7 |
GND = |
Pin 10 |
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SF01035 |
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FUNCTION TABLE
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INPUTS |
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OUTPUTS |
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OE |
T/R |
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L |
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L |
Bus B data to Bus A |
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L |
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H |
Bus A data to Bus B |
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H |
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X |
Z |
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H |
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High voltage level |
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L |
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Low voltage level |
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X |
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Don't care |
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Z |
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High impedance ªoffº state |
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1990 Mar 01 |
3 |
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