INTEGRATED CIRCUITS
74F655A*
Octal buffer/driver with parity, inverting (3-State)
74F656A
Octal buffer/driver with parity, non-inverting (3-State)
* Discontinued part. Please see the Discontinued Product List.
Product specification |
1991 Jul 17 |
IC15 Data Handbook
m n r
Philips Semiconductors Product specification
Buffers/drivers |
74F655A* |
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74F656A |
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74F655A Octal buffer/driver with parity, inverting (3-State) 74F656A Octal buffer/driver with parity, non-inverting (3-State)
FEATURES
•Significantly improved AC performance over 74F655 and 74F656
•High impedance NPN base input for reduced loading (40μA in High and Low states)
•Ideal in applications where high output drive and light bus loading are required (IIL is 40μA vs. FAST std of 600μA)
•74F655A combines 74F240 and 74F280A functions in one package
•74F656A combines 74F244 and 74F280A functions in one package
•74F655A Inverting
•74F656A Non-inverting
•3-State outputs sink 64mA and source 15mA
•24-pin plastic Slim DIP (300mil) package
•Inputs on one side and outputs on the other side simplifies PC board layout
•Combined functions reduce part count and enhance system performance
•Industrial temperature range available (±40°C to +85°C)
DESCRIPTION
The 74F655A and 74F656A are octal buffers and line drivers with parity generation/checking designed to be employed as memory address drivers, clock drivers and bus-oriented transmitters/receivers. These parts include parity generator/checker to improve PC board density.
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TYPICAL |
TYPICAL SUPPLY CURRENT |
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TYPE |
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DELAY |
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74F655A |
6.5ns |
64mA |
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74F656A |
6.5ns |
64mA |
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ORDERING INFORMATION
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COMMERCIAL RANGE |
INDUSTRIAL RANGE |
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DESCRIPTION |
VCC = 5V ±10%, |
VCC = 5V ±10%, |
PKG DWG # |
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Tamb = 0°C to +70°C |
Tamb = ±40°C to +85°C |
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24-pin Plastic Slim |
N74F656AN |
I74F656AN |
SOT222-1 |
DIP (300mil) |
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24-pin Plastic SOL |
N74F656AD |
I74F656AD |
SOT137-1 |
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INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
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PINS |
DESCRIPTION |
74F(U.L.) |
LOAD VALUE |
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HIGH/LOW |
HIGH/LOW |
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D0±D7 |
Data inputs |
2.0/0.066 |
40μA/40μA |
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PI |
Parity input |
1.0/0.033 |
20μA/20μA |
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Output Enable Inputs (active Low) |
1.0/0.033 |
20μA/20μA |
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OE0, OE1, OE2 |
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ΣE, ΣO |
Parity outputs |
750/106.7 |
15mA/64mA |
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Data outputs (74F655A) |
750/106.7 |
15mA/64mA |
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Q0±Q7 |
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Q0±Q7 |
Data outputs (74F656A) |
750/106.7 |
15mA/64mA |
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NOTE: One (1.0) FAST Unit Load (U.L.) is defined as: 20μA in the High state and 0.6mA in the Low state.
* Discontinued part. Please see the Discontinued Products List. |
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1991 Jul 17 |
2 |
853-0383 03305 |
Philips Semiconductors Product specification
Buffers/drivers |
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74F655A* |
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74F656A |
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PIN CONFIGURATION ± 74F655A |
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PIN CONFIGURATION ± 74F656A |
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VCC |
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OE0 |
1 |
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24 |
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VCC |
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OE0 |
1 |
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24 |
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OE1 |
2 |
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23 |
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OE2 |
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OE1 |
2 |
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23 |
OE2 |
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ΣO |
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PI |
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ΣO |
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PI |
3 |
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22 |
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3 |
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22 |
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D0 |
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ΣE |
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D0 |
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ΣE |
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4 |
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21 |
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4 |
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21 |
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D1 |
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D1 |
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Q0 |
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5 |
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Q0 |
5 |
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20 |
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D2 |
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D2 |
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Q1 |
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6 |
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19 |
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Q1 |
6 |
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19 |
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D3 |
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Q2 |
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D3 |
7 |
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18 |
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Q2 |
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7 |
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18 |
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D4 |
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Q3 |
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D4 |
8 |
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Q3 |
8 |
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17 |
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D5 |
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D5 |
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Q4 |
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9 |
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16 |
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Q4 |
9 |
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16 |
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D6 |
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Q5 |
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D6 |
10 |
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15 |
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Q5 |
10 |
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15 |
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D7 |
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Q6 |
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D7 |
11 |
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14 |
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Q6 |
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11 |
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14 |
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GND |
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GND |
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Q7 |
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12 |
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13 |
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Q7 |
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12 |
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13 |
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SF01168 |
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SF01169 |
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LOGIC SYMBOL ± 74F655A
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4 |
5 |
6 |
7 |
8 |
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10 |
11 |
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D0 |
D1 |
D2 |
D3 |
D4 |
D5 |
D6 |
D7 |
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3 |
PI |
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1 |
OE0 |
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ΣE |
21 |
2 |
OE1 |
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ΣO |
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OE2 |
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23 |
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Q0 |
Q1 |
Q2 |
Q3 |
Q4 |
Q5 |
Q6 |
Q7 |
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20 |
19 |
18 |
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16 |
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14 |
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VCC=Pin 24 |
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GND=Pin 12 |
SF01170 |
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IEEE/IEC SYMBOL ± 74F655A
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2K |
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3,5,6,7,8 |
21 |
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[EVEN] |
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9,10,11,12 |
22 |
3 |
P3 |
3,5,6,7,8 |
[ODD] |
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9,10,11,12 |
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1 |
≥ 1 |
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2 |
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EN4 |
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23 |
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4 |
Z5 |
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20 |
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4 |
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Z6 |
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6 |
Z7 |
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18 |
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7 |
Z8 |
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8 |
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Z9 |
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16 |
9 |
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Z10 |
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10 |
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14 |
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Z11 |
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11 |
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13 |
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Z12 |
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SF01172
LOGIC SYMBOL ± 74F656A
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4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
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D0 |
D1 |
D2 |
D3 |
D4 |
D5 |
D6 |
D7 |
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3 |
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PI |
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ΣE |
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21 |
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1 |
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OE0 |
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2 |
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OE1 |
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ΣO |
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22 |
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23 |
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OE2 |
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Q0 |
Q1 |
Q2 |
Q3 |
Q4 |
Q5 |
Q6 |
Q7 |
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VCC=Pin 24 |
20 |
19 |
18 |
17 |
16 |
15 |
14 |
13 |
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GND=Pin 12 |
SF01171 |
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LOGIC SYMBOL (IEEE/IEC) ± 74F656A
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2K |
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3,5,6,7,8 |
21 |
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[EVEN] |
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9,10,11,12 |
22 |
3 |
P3 |
3,5,6,7,8 |
[ODD] |
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9,10,11,12 |
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1 |
≥ 1 |
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2 |
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EN4 |
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23 |
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4 |
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20 |
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Z5 |
4 |
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5 |
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19 |
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Z6 |
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6 |
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18 |
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Z7 |
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7 |
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17 |
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Z8 |
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16 |
Z9 |
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9 |
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15 |
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Z10 |
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10 |
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14 |
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Z11 |
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11 |
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13 |
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Z12 |
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SF01173
* Discontinued part. Please see the Discontinued Products List.
1991 Jul 17 |
3 |
Philips Semiconductors |
Product specification |
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74F655A* |
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Buffers/drivers |
74F656A |
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LOGIC DIAGRAM ± 74F655A
PI |
3 |
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21 |
ΣE |
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22 |
ΣO |
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D0 |
4 |
20 |
Q0 |
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D1 |
5 |
19 |
Q1 |
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D2 |
6 |
18 |
Q2 |
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D3 |
7 |
17 |
Q3 |
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D4 |
8 |
16 |
Q4 |
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D5 |
9 |
15 |
Q5 |
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D6 |
10 |
14 |
Q6 |
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D7 |
11 |
13 |
Q7 |
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OE0 |
1 |
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OE1 |
2 |
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OE2 |
23 |
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VCC = Pin 24 |
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GND = Pin 12 |
SF01174 |
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* Discontinued part. Please see the Discontinued Products List.
1991 Jul 17 |
4 |
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