74F241 查看數據表（PDF） - Philips Electronics
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74F241 Datasheet PDF : 12 Pages
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Philips Semiconductors
Buffers
Product specification
74F240/74F240A/
74F241/74F241A
FEATURES
• Octal bus interface
• 3-State buffer outputs sink 64mA
• 15mA source current
• Guaranteed output skew less than 2.0ns
(74F240A/74F241A)
• Reduced ground bounce (74F240A/74F241A)
• Reduced ICC (74F241A only)
• Reduced loading (74F240A IIL = 100µA,
74F241A IIL = 40µA)
TYPE
74F240
74F240A
74F241
74F241A
TYPICAL PROPAGATION DELAY
4.3ns
3.8ns
5.0ns
4.5ns
DESCRIPTION
The 74F240 and 74F241 are octal buffers that are ideal for
driving bus lines of buffer memory address registers. The
outputs are all capable of sinking 64mA and sourcing up to
15mA. The device features two output enables, each
controlling four of the 3–state outputs.
The 74F240A and 74F241A are functionally equivalent to
their non–A counterparts. They have been designed to
reduce effects of ground noise. Other advantages are noted
in the features.
TYPICAL SUPPLY CURRENT (TOTAL)
37mA
40mA
53mA
32mA
ORDERING INFORMATION
DESCRIPTION
20–pin plastic DIP
20–pin plastic SOL
20-pin plastic SSOP II
ORDER CODE
COMMERCIAL RANGE
VCC = 5V ±10%, Tamb = 0°C to +70°C
N74F240N, N74F240AN, N74F241N, N74F241AN
N74F240D, N74F240AD, N74F241D, N74F241AD
N74F240DB
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
DESCRIPTION
Data inputs (74F240)
Ian, Ibn
Data inputs (74F240A)
Data inputs (74F241)
Data inputs (74F241A)
OEa, OEb
OEa, OEb
Output enable inputs (active low) (74F240)
Output enable inputs (active low) (74F240A)
Output enable input (74F241)
Output enable input (74F241A)
Yan, Ybn
Data outputs (74F241, 74F241A)
Yan, Ybn
Data outputs (74F240, 74F240A)
Note to input and output loading and fan out table
One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6mA in the low state.
74F (U.L.)
HIGH/LOW
1.0/1.67
1.0/0.167
1.0/2.67
1.0/0.067
1.0/0.33
1.0/0.167
1.0/1.67
1.0/0.067
750/106.7
750/106.7
PKG DWG #
SOT146-1
SOT163-1
SOT339-1
LOAD VALUE
HIGH/LOW
20µA/1.0mA
20µA/100µA
20µA/1.6mA
20µA/40µA
20µA/0.2mA
20µA/100µA
20µA/1.0mA
20µA/40µA
15mA/64mA
15mA/64mA
January 2, 1991
2
853–0355 01345
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