參數(shù)資料
型號(hào)： 933778240623
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 鎖存器
英文描述： F/FAST SERIES, NEGATIVE EDGE TRIGGERED D FLIP-FLOP, TRUE OUTPUT, PDSO16
封裝： 3.90 MM, PLASTIC, MS-012AC, SOT-109-1, SO-16
文件頁(yè)數(shù)： 2/8頁(yè)
文件大?。?/td> 87K
代理商： 933778240623
Philips Semiconductors
Product specification
74F298
Quad 2-input multiplexer with storage
2
1989 Aug 14
853–0061 97377
FEATURES
Fully synchronous operation
Select from two data sources
Buffered, negative edge triggered clock
Provides the equivalent of function capabilities of two separate
MSI functions (74F157 and 74F175)
DESCRIPTION
The 74F298 is a high speed Quad 2-Input Multiplexer with storage.
It selects 4 bits of data from two sources (ports) under the control of
a common Select input (S). The selected data is transferred to the
4-bit output register synchronous with the High-to-Low transition of
the clock (CP). The 4-bit register is fully edge triggered. The data
inputs (I0 and I1) and Select input (S) must be stable only one setup
time prior to the High-to-Low transition of the clock for predictable
operation.
PIN CONFIGURATION
16
15
14
13
12
11
10
7
6
5
4
3
2
1
I0d
VCC
Qd
CP
S
Qc
Qa
Qb
I1b
I1a
I1d
I0a
I0b
I1c
9
8
GND
I0c
SF00859
TYPE
TYPICAL fMAX
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F298
115MHz
30mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
PKG DWG #
16-pin plastic DIP
N74F298N
SOT38-4
16-pin plastic SO
N74F298D
SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F (U.L.) HIGH/LOW
LOAD VALUE HIGH/LOW
I0a, I0b, I0c, I0d
Data inputs
1.0/1.0
20
A/0.6mA
I1a, I1b, I1c, I1d
Data inputs
1.0/1.0
20
A/0.6mA
S
Select input
1.0/1.0
20
A/0.6mA
CP
Clock input (active falling edge)
1.0/1.0
20
A/0.6mA
Qa, Qb, Qc, Qd
Data outputs
50/33
1.0mA/20mA
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
VCC = Pin 16
GND = Pin 8
SF00860
10
11
S
CP
3241
957
I0a
I1a
I0b
I1b
I0c
I1c
I0d
Qa
Qb
Qc
Qd
15
14
13
12
6
I1d
LOGIC SYMBOL (IEEE/IEC)
SF00861
3
2, 1D
11
C1
10
M2
2
15
2, 1D
4
1
14
9
5
13
7
6
12
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