74F2244 Datasheet, PDF (2/10 Pages) NXP Semiconductors – Octal buffer with 30ohm equivalent output termination 3-State

Philips Semiconductors
Octal buffer with 30Ω equivalent output termination
(3-State)
Product specification
74F2244
FEATURES
• Octal bus interface
• 30Ω output termination ideal for driving DRAM
• 15mA source current
• SSOP Type II Package
DESCRIPTION
The 74F2244 is an octal buffer that is ideal for driving dynamic
DRAM with matching impedance. The outputs are all capable of
sinking 5mA and sourcing up to 15mA. The device features two
output enables, OEa and OEb, each controlling four of the 3–state
outputs.
TYPE
74F2244
TYPICAL
PROPAGATION
DELAY
4.0ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
30mA
ORDERING INFORMATION
DESCRIPTION
20-pin plastic DIP
20-pin plastic SOL
20-pin plastic SSOP Type II
ORDER CODE
COMMERCIAL RANGE
V_CC = 5V ±10%, T_amb = 0°C to +70°C
N74F2244N
N74F2244D
N74F2244DB
DRAWING NUMBER
SOT146-1
SOT163-1
SOT339-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
Ian, Ibn
Data inputs
DESCRIPTION
74F (U.L.)
HIGH/LOW
1.0/0.33
OEa, OEb
Output enable inputs (active low)
1.0/0.33
Yan, Ybn
Data outputs
750/8.33
NOTE: One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6mA in the low state.
LOAD VALUE
HIGH/LOW
20µA/0.2mA
20µA/0.2mA
15mA/5mA
PIN CONFIGURATION
LOGIC SYMBOL
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
SF00227
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
V_CC = Pin 20
GND = Pin 10
18 16 14 12 3 5 7 9
SF00228
1994 Dec 05
2
853-1525 14380