N74F2240N 데이터 시트보기 (PDF) - Philips Electronics
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N74F2240N Datasheet PDF : 10 Pages
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Philips Semiconductors
Octal buffers
Product specification
74F2240, 74F2241
FEATURES
• Octal bus interface
• 30Ω output termination ideal for driving DRAM
• 15mA source current
DESCRIPTION
The 74F2240 and 74F2241 are octal buffers that are ideal for
driving dynamic DRAM with impedance matching. The outputs are
all capable of sinking 5mA and sourcing up to 15mA. The device
features two output enables, each controlling four of the 3-state
outputs.
TYPE
74F2240
74F2241
TYPICAL
PROPAGATION
DELAY
4.3ns
4.5ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
37mA
30mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
20-pin plastic DIP
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
N74F2240N, N74F2241N
20-pin plastic SOL N74F2240D, N74F2241D
PKG DWG #
SOT146-1
SOT163-1
INPUT AND OUTPUT LOADING
AND FAN-OUT TABLE
PINS
DESCRIPTION
Ian, Ibn Data inputs
74F (U.L.)
HIGH/LOW
LOAD
VALUE
HIGH/LOW
1.0/0.33 20µA/0.2mA
OEa, OEb
Output enable inputs
(active Low)
1.0/0.33 20µA/0.2mA
OEb
Output enable input
(74F2241)
1.0/0.33 20µA/0.2mA
Yan, Ybn Data outputs (74F2241) 750/8.33 15mA/5mA
Yan, Ybn Data outputs (74F2240) 750/8.33 15mA/5mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High
state and 0.6mA in the Low state.
PIN CONFIGURATION
74F2240
OEa 1
Ia0 2
Yb0 3
Ia1 4
Yb1 5
Ia2 6
Yb2 7
Ia3 8
Yb3 9
GND 10
20 VCC
19 OEb
18 Ya0
17 Ib0
16 Ya1
15 Ib1
14 Ya2
13 Ib2
12 Ya3
11 Ib3
LOGIC SYMBOL
74F2240
2 4 6 8 17 15 13 11
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
1
OEa
19
OEb
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
VCC = Pin 20
GND = Pin 10
18 16 14 12 3 5 7 9
SF00562
IEC/IEEE SYMBOL
74F2240
1
EN1
19
EN2
2
2D
1
18
4
16
6
14
8
12
17
2
3
15
5
13
7
11
9
SF00561
SF00563
December 13, 1990
2
853-1524 01255
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