Philips N74ALS245A-1D, N74ALS245A-1DB, N74ALS245A-1N, N74ALS245AD, N74ALS245ADB Datasheet
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INTEGRATED CIRCUITS
74ALS245A/74ALS245A±1
Octal transceiver (3±State)
Product specification |
1991 Jun 03 |
IC05 Data Handbook |
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Philips Semiconductors |
Product specification |
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Octal transceiver (3-State) |
74ALS245A/74ALS245A-1 |
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FEATURES
•Octal bidirectional bus interface
•3-State buffer outputs sink 24mA and source 15mA
•Outputs are placed in high impedance state during power-off conditions
•The -1 version sinks 48mA
DESCRIPTION
The 74ALS245A is an octal transceiver featuring non-inverting 3-State bus compatible outputs in both transmit and receive
directions. The device features an output enable (OE) input for easy cascading and transmit/receive (R/T) input for direction control.
The 74ALS245A-1 is the same as the 74ALS245A except that both ports sink 48mA within the ±5% VCC range.
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TYPICAL |
TYPICAL |
TYPE |
PROPAGATION |
SUPPLY CURRENT |
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DELAY |
(TOTAL) |
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74ALS245A |
7.0ns |
34mA |
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74ALS245A-1 |
7.0ns |
34mA |
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PIN CONFIGURATION
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1 |
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20 |
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VCC |
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T/R |
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A0 |
2 |
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19 |
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OE |
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A1 |
3 |
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18 |
B0 |
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A2 |
4 |
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17 |
B1 |
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A3 |
5 |
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16 |
B2 |
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A4 |
6 |
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15 |
B3 |
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A5 |
7 |
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14 |
B4 |
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A6 |
8 |
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13 |
B5 |
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A7 |
9 |
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12 |
B6 |
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GND |
10 |
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11 |
B7 |
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SF00198 |
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ORDERING INFORMATION |
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ORDER CODE |
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DRAWING |
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DESCRIPTION |
COMMERCIAL RANGE |
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NUMBER |
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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 |
74ALS245AN, |
SOT146-1 |
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74ALS245A-1N |
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20-pin plastic SOL |
74ALS245AD, |
SOT163-1 |
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744ALS245A-1D |
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20-pin plastic SSOP |
74ALS245ADB, |
SOT339-1 |
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Type II |
74ALS245A-1DB |
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INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS |
DESCRIPTION |
74ALS (U.L.) |
LOAD VALUE |
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HIGH/LOW |
HIGH/LOW |
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A0 ± A7, B0 ± B7 |
Data inputs |
1.0/1.0 |
20μA/0.1mA |
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Output Enable input (active-Low) |
1.0/1.0 |
20μA/0.1mA |
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OE |
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Transmit/receive input |
1.0/1.0 |
20μA/0.1mA |
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T/R |
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A0 ± A7 |
A port outputs |
750/240 |
15mA/24mA |
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B0 ± B7 |
B port outputs |
750/240 |
15mA/24mA |
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A0 ± A7 |
A port outputs (-1 version) |
750/480 |
15mA/48mA |
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B0 ± B7 |
B port outputs (-1 version) |
750/480 |
15mA/48mA |
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NOTE: One (1.0) ALS unit load is defined as: 20μA in the High state and 0.1mA in the Low state.
1991 Jun 03 |
2 |
853±0011 02709 |
Philips Semiconductors |
Product specification |
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Octal transceiver (3-State) |
74ALS245A/74ALS245A-1 |
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LOGIC SYMBOL |
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IEC/IEEE SYMBOL |
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2 |
3 |
4 |
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19 |
G3 |
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5 |
6 |
7 |
8 |
9 |
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3EN1 [BA] |
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1 |
3EN2 [AB] |
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A0 |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
1 |
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19 |
OE |
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2 |
2 |
18 |
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1 |
T/R |
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3 |
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17 |
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4 |
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16 |
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B0 |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
B7 |
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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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18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
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8 |
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12 |
VCC = Pin 20 |
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9 |
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11 |
GND = Pin 10 |
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SF00199 |
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SC00097 |
LOGIC DIAGRAM
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A0 |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
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2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
OE |
19 |
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T/R |
1 |
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VCC = Pin 20 |
18 |
17 |
16 |
15 |
14 |
13 |
12 |
11 |
B0 |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
B7 |
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GND = Pin 10 |
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SF00201 |
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FUNCTION TABLE
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INPUTS |
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OUTPUTS |
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OE |
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T/R |
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L |
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L |
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Bus B data to Bus A |
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L |
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H |
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Bus A data to Bus B |
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H |
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X |
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Z |
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H |
= |
High voltage level |
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L |
= |
Low voltage level |
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X |
= |
Don't care |
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Z |
= |
High impedance ªoffº state |
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1991 Jun 03 |
3 |
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