INTEGRATED CIRCUITS
74F244/74F244B
Octal buffers (3-State)
Product specification |
1994 Dec 05 |
IC15 Data Handbook
Philips Semiconductors
Philips Semiconductors |
Product specification |
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Octal buffers (3-State) |
74F244/74F244B |
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FEATURES
•Octal bus interface
• 3-State output buffer sink 64mA
•15mA source current
•Guaranteed output skew less than 2.0ns (74F244B)
•Reduced ground bounce (74F244B)
•Reduced ICC (74F244B)
•Reduced loading (74F244B IIL = 40μA)
•Split lead frame offers increased noise immunity (74F244B)
•Industrial temperature range available (-40°C to +85°C) for 74F244
•74F244 available in SSOP Type II package
DESCRIPTION
The 74F244 is an octal buffer that is ideal for driving bus lines of buffer memory address registers. The outputs are all capable of sinking 64mA and sourcing up to 15mA, producing very good capacitive drive characteristics. The device features two output enables, OEa and OEb, each controlling four of the 3-State outputs.
The 74F244B is functionally equivalent to the 74F244. It has been designed to reduce effects of ground noise. Other advantages are noted in the features.
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TYPICAL |
TYPICAL SUPPLY |
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CURRENT (TOTAL) |
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DELAY |
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74F244 |
4.0ns |
53mA |
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74F244B |
4.0ns |
33mA |
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ORDERING INFORMATION
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ORDER CODE |
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COMMERCIAL RANGE |
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INDUSTRIAL RANGE |
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PKG DWG # |
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DESCRIPTION |
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VCC = 5V ±10%, |
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VCC = 5V ±10%, |
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Tamb = 0°C to +70°C |
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Tamb = -40°C to +85°C |
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20-pin plastic DIP |
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N74F244N, N74F244BN |
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I74F244N |
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SOT146-1 |
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20-pin plastic SOL |
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N74F244D, N74F244BD |
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I74F244D |
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SOT163-1 |
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20-pin plastic SSOP II |
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N74F244DB |
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SOT339-1 |
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INPUT AND OUTPUT LOADING AND FAN OUT TABLE |
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PINS |
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DESCRIPTION |
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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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Ian, Ibn |
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Data inputs (74F244) |
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1.0/2.67 |
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20μA/1.6mA |
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Data inputs (74F244B) |
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1.0/0.067 |
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20μA/40μA |
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Output enable inputs (active low) (74F244) |
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1.0/1.67 |
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20μA/1.0mA |
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OEa, OEb |
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Output enable inputs (active low) (74F244B) |
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1.0/0.067 |
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20μA/40μA |
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Yan, Ybn |
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Data outputs |
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750/106.7 |
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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. |
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PIN CONFIGURATION |
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LOGIC SYMBOL |
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1 |
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20 |
VCC |
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OEa |
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2 |
4 |
6 |
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17 |
15 |
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11 |
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Ia0 |
2 |
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19 |
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OEb |
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Yb0 |
3 |
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18 |
Ya0 |
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Ia1 |
4 |
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17 |
Ib0 |
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Ia0 |
Ia1 |
Ia2 |
Ia3 |
Ib0 |
Ib1 |
Ib2 |
Ib3 |
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Yb1 |
5 |
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16 |
Ya1 |
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1 |
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OEa |
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Ia2 |
6 |
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15 |
Ib1 |
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19 |
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OEb |
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Yb2 |
7 |
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14 |
Ya2 |
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Ya0 |
Ya1 Ya2 |
Ya3 |
Yb0 |
Yb1 |
Yb2 |
Yb3 |
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Ia3 |
8 |
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13 |
Ib2 |
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Yb3 |
9 |
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12 |
Ya3 |
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18 |
16 |
14 |
12 |
3 |
5 |
7 |
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GND |
10 |
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11 |
Ib3 |
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VCC = Pin 20 |
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SF00227 |
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GND = Pin 10 |
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SF00228 |
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1994 Dec 5 |
2 |
853-0357 14381 |
Philips Semiconductors |
Product specification |
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Octal buffers (3-State) |
74F244/74F244B |
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IEC/IEEE SYMBOL
1 |
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EN1 |
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19 |
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EN2 |
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2 |
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18 |
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2D |
1 |
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4 |
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16 |
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6 |
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14 |
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8 |
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12 |
17 |
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2 |
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3 |
15 |
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5 |
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7 |
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FUNCTION TABLE
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INPUTS |
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OUTPUTS |
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Ia |
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Ib |
Ya |
Yb |
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OEa |
OEb |
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L |
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L |
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L |
L |
L |
L |
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L |
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H |
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L |
H |
H |
H |
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H |
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X |
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H |
X |
Z |
Z |
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NOTES: |
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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 ºoffº state |
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SF00229
LOGIC DIAGRAM
Ia0 |
2 |
18 |
Ya0 |
Ib0 |
17 |
3 |
Yb0 |
Ia1 |
4 |
16 |
Ya1 |
Ib1 |
15 |
5 |
Yb1 |
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Ia2 |
6 |
14 |
Ya2 |
Ib2 |
13 |
7 |
Yb2 |
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Ia3 |
8 |
12 |
Ya3 |
Ib3 |
11 |
9 |
Yb3 |
OEa |
1 |
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OEb |
19 |
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VCC = Pin 20
GND = Pin 10
SF00230
1994 Dec 5 |
3 |
Philips Semiconductors |
Product specification |
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Octal buffers (3-State) |
74F244/74F244B |
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ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit 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 |
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RATING |
UNIT |
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VCC |
Supply voltage |
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-0.5 to +7.0 |
V |
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VIN |
Input voltage |
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-0.5 to +7.0 |
V |
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IIN |
Input current |
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-30 to +5 |
mA |
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VOUT |
Voltage applied to output in high output state |
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-0.5 to V |
V |
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CC |
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IOUT |
Current applied to output in low output state |
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128 |
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mA |
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Commercial range |
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0 to +70 |
°C |
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Tamb |
Operating free air temperature range |
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Industrial range |
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-40 to +85 |
°C |
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(74F244 only) |
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T |
Storage temperature range |
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-65 to +150 |
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stg |
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C |
RECOMMENDED OPERATING CONDITIONS |
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SYMBOL |
PARAMETER |
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LIMITS |
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UNIT |
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MIN |
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NOM |
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MAX |
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VCC |
Supply voltage |
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4.5 |
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5.0 |
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5.5 |
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V |
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VIN |
High-level input voltage |
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2.0 |
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V |
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VIL |
Low-level input voltage |
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0.8 |
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V |
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IIK |
Input clamp current |
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±18 |
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mA |
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IOH |
High-level output current |
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±15 |
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mA |
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iol |
Low-level output current |
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64 |
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mA |
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Commercial range |
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0 |
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+70 |
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°C |
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Tamb |
Operating free air temperature range |
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Industrial range |
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±40 |
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+85 |
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°C |
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(74F244 only) |
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1994 Dec 5 |
4 |
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