INTEGRATED CIRCUITS
74F245
Octal transceiver (3-State)
Product specification |
1994 Nov 15 |
IC15 Data Handbook
Philips Semiconductors
Philips Semiconductors |
Product specification |
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Octal transceiver (3-State) |
74F245 |
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FEATURES
•Octal bidirectional bus interface
•3-State buffer outputs sink 64mA
•15mA source current
•Outputs are placed in high impedance state during power-off conditions
DESCRIPTION
The 74F245 is an octal transceiver featuring non-inverting 3-State bus compatible outputs in both transmit and receive directions. The B port outputs are capable of sinking 64mA and sourcing 15mA, producing 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.
PIN CONFIGURATION
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VCC |
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T/R |
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1 |
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20 |
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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 |
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B0 |
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A2 |
4 |
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17 |
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B1 |
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A3 |
5 |
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16 |
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B2 |
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A4 |
6 |
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15 |
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B3 |
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A5 |
7 |
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14 |
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B4 |
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A6 |
8 |
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13 |
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B5 |
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A7 |
9 |
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12 |
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B6 |
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GND |
10 |
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11 |
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B7 |
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SF00198 |
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TYPE |
TYPICAL PROPAGATION DELAY |
TYPICAL SUPPLY CURRENT (TOTAL) |
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74F245 |
4.0ns |
70mA |
ORDERING INFORMATION
DESCRIPTION |
COMMERCIAL RANGE |
DRAWING NUMBER |
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VCC = 5V |
±10%, Tamb = 0°C to +70°C |
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20-Pin Plastic DIP |
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N74F245N |
SOT146-1 |
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20-Pin Plastic SO |
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N74F245D |
SOT163-1 |
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20-Pin Plastic SSOP Type II |
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N74F245DB |
SOT339-1 |
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INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS |
DESCRIPTION |
74F (U.L.) HIGH/LOW |
LOAD VALUE HIGH/LOW |
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A0±A7, B0±B7 |
Data inputs |
3.5/1.0 |
70μA/0.6mA |
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Output Enable input (active Low) |
1.0/2.0 |
20μA/1.2mA |
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OE |
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Transmit/Receive input |
1.0/2.0 |
20μA/1.2mA |
T/R |
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A0±A7 |
A port outputs |
150/40 |
3.0mA/24mA |
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B0±B7 |
B port outputs |
750/106.7 |
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. |
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LOGIC SYMBOL |
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IEC/IEEE SYMBOL |
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19 |
G3 |
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2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
1 |
3EN1 (BA) |
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3EN1 (AB) |
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1 |
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A0 |
A1 |
A2 |
A3 |
A4 |
A5 |
A6 |
A7 |
2 |
2 |
18 |
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19 |
OE |
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3 |
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17 |
1 |
T/R |
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4 |
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16 |
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B0 |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
B7 |
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 |
8 |
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12 |
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9 |
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11 |
VCC = Pin 20 |
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GND = Pin 10 |
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SF00199 |
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SF00200 |
November 15, 1994 |
2 |
853±0025 14256 |
Philips Semiconductors |
Product specification |
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Octal transceiver (3-State) |
74F245 |
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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 |
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 |
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 = 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
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL |
PARAMETER |
RATING |
UNIT |
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VCC |
Supply voltage |
±0.5 to +7.0 |
V |
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VIN |
Input voltage |
±0.5 to +7.0 |
V |
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IIN |
Input current |
±30 to +5 |
mA |
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VOUT |
Voltage applied to output in High output state |
±0.5 to +5.5 |
V |
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IOUT |
Current applied to output in Low output state |
A0±A7 |
48 |
mA |
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B0±B7 |
128 |
mA |
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Tamb |
Operating free-air temperature range |
0 to +70 |
°C |
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Tstg |
Storage temperature range |
±65 to +150 |
°C |
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RECOMMENDED OPERATING CONDITIONS
SYMBOL |
PARAMETER |
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LIMITS |
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UNIT |
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MIN |
NOM |
MAX |
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VCC |
Supply voltage |
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4.5 |
5.0 |
5.5 |
V |
VIH |
High-level input voltage |
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2.0 |
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V |
VIL |
Low-level input voltage |
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0.8 |
V |
IIK |
Input clamp current |
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±18 |
mA |
IOH |
High-level output current |
A0±A7 |
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±3 |
mA |
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B0±B7 |
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±15 |
mA |
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IOL |
Low-level output current |
A0±A7 |
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24 |
mA |
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B0±B7 |
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64 |
mA |
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Tamb |
Operating free-air temperature range |
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0 |
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+70 |
°C |
November 15, 1994 |
3 |
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