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參數(shù)資料
| 型號： | 933768990602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | F/FAST SERIES, OCTAL 1-BIT DRIVER, TRUE OUTPUT, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 85K |
| 代理商： | 933768990602 |
Philips Semiconductors
Product specification
74F1244
Octal buffer (3-State)
2
1989 Apr 04
853–0041 96221
FEATURES
High impedance NPN base inputs for reduced loading
(20
A in High and Low states)
Low power, light loading
Functional pin-for-pin equivalent of 74F244
1/30th the bus loading of 74F244
Provides ideal interface and increase fan-out of MOS
microprocessors
Octal bus interface
3-State buffer outputs sink 64mA and source 15mA
DESCRIPTION
The 74F1244 is an octal buffer that is ideal for driving bus lines or
buffer memory address registers. The outputs are 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 74F1244 is pin and functionally compatible with the 74F244.
The lower power and light bus loading features make it an ideal part
to interface directly with MOS microprocessors.
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 VCC
OEa
Ia0
Yb0
Ia1
Yb1
Ia2
Yb2
Ia3
Yb3
GND
SF00227
OEb
Ya0
Ib0
Ya1
Ib1
Ya2
Ib2
Ya3
Ib3
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL SUPPLY
CURRENT (TOTAL)
74F1244
4.5ns
43mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
DRAWING
NUMBER
20-pin plastic DIP
N74F1244N
SOT146-1
20-pin plastic SOL
N74F1244D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
DESCRIPTION
74F (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
Ian, Ibn
Data inputs
1.0/0.033
20
A/20A
OEa, OEb
Output enable inputs (active Low)
1.0/0.033
20
A/20A
Yan, Ybn
Data outputs
750/106.7
15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20
A in the high state and 0.6mA in the low state.
LOGIC SYMBOL
OEa
1
SF00228
2
4
6
8
17
15
13
11
18
16
14
12
3
5
7
9
Ia0
Ia1
Ia2
Ia3
Ib0
Ib1
Ib2
Ib3
Ya0
Ya1 Ya2
Ya3 Yb0 Yb1 Yb2 Yb3
VCC = Pin 20
GND = Pin 10
OEb
19
IEC/IEEE SYMBOL
2
1
EN1
1
2
SF01366
19
4
6
8
17
15
13
11
EN2
9
7
5
3
12
14
16
18
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