INTEGRATED CIRCUITS
74F244/74F244B
Octal buffers (3-State)
Product specification 1994 Dec 05
IC15 Data Handbook
Philips SemiconductorsPhilips Semiconductors Product specification
Octal buffers (3-State) 74F244/74F244B
FEATURES DESCRIPTION
The 74F244 is an octal buffer that is ideal for driving bus lines of
Octal bus interface
buffer memory address registers. The outputs are all capable of
3-State output buffer sink 64mA
sinking 64mA and sourcing up to 15mA, producing very good
capacitive drive characteristics. The device features two output
15mA source current
enables, OEa and OEb, each controlling four of the 3-State outputs.
Guaranteed output skew less than 2.0ns (74F244B)
The 74F244B is functionally equivalent to the 74F244. It has been
designed to reduce effects of ground noise. Other advantages are
Reduced ground bounce (74F244B)
noted in the features.
Reduced I (74F244B)
CC
Reduced loading (74F244B I = 40A)
IL TYPICAL
TYPICAL SUPPLY
TYPE PROPAGATION
Split lead frame offers increased noise immunity (74F244B) CURRENT (TOTAL)
DELAY
Industrial temperature range available (-40C to +85C) for
74F244 4.0ns 53mA
74F244
74F244B 4.0ns 33mA
74F244 available in SSOP Type II package
ORDERING INFORMATION
ORDER CODE
COMMERCIAL RANGE INDUSTRIAL RANGE
PKGPKG DWGDWG ##
DESCRIPTION
V = 5V 10%, V = 5V 10%,
CC CC
T = 0C to +70C T = -40C to +85C
amb amb
20-pin plastic DIP N74F244N, N74F244BN I74F244N SOT146-1
20-pin plastic SOL N74F244D, N74F244BD I74F244D SOT163-1
20-pin plastic SSOP II N74F244DB SOT339-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
74F (U.L.) LOAD VALUE
PINS DESCRIPTION
HIGH/LOW HIGH/LOW
Ian, Ibn Data inputs (74F244) 1.0/2.67 20A/1.6mA
Data inputs (74F244B) 1.0/0.067 20A/40A
OEa, OEb Output enable inputs (active low) (74F244) 1.0/1.67 20A/1.0mA
Output enable inputs (active low) (74F244B) 1.0/0.067 20A/40A
Yan, Ybn Data outputs 750/106.7 15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20A in the high state and 0.6mA in the low state.
PIN CONFIGURATION LOGIC SYMBOL
1 20
OEa V
CC
2 4 6 8 17 15 13 11
2 19
Ia0 OEb
3 18
Yb0 Ya0
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
4 17
Ia1 Ib0
5 16
Yb1 Ya1 1
OEa
19 OEb
6 15
Ia2 Ib1
7 14
Yb2
Ya2
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
Ia3 8 13
Ib2
Yb3 9 12
Ya3
18 16 14 12 3 5 7 9
GND 10 11
Ib3
V = Pin 20
CC
GND = Pin 10
SF00228
SF00227
2
1994 Dec 5 853-0357 14381