Philips 74f2244 DATASHEETS
INTEGRATED CIRCUITS
74F2244
Octal buffer with 30Ω equivalent output
termination (3-State)
Product specification 1994 Dec 5
IC15 Data Handbook
Philips Semiconductors
Philips Semiconductors Product specification
Octal buffer with 30Ω equivalent output termination
(3-State)
FEA TURES
•Octal bus interface
•30Ω output termination ideal for driving DRAM
•15mA source current
•SSOP Type II Package
ORDERING INFORMATION
ORDER CODE
DESCRIPTION COMMERCIAL RANGE
= 5V ±10%, T
V
CC
20-pin plastic DIP N74F2244N SOT146-1
20-pin plastic SOL N74F2244D SOT163-1
20-pin plastic SSOP Type II N74F2244DB SOT339-1
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, OE
outputs.
TYPE
74F2244 4.0ns 30mA
= 0°C to +70°C
amb
a and OEb, each controlling four of the 3–state
TYPICAL
PROPAGATION
DELA Y
DRAWING NUMBER
74F2244
TYPICAL
SUPPLY CURRENT
(TOTAL)
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS DESCRIPTION
Ian, Ibn Data inputs 1.0/0.33 20µA/0.2mA
OEa, OEb Output enable inputs (active low) 1.0/0.33
Yan, Ybn Data outputs 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
1
OEa
2
Ia0
3
Yb0
4
Ia1
5
Yb1
6
Ia2
7
Yb2
8
Ia3
9
Yb3
10 11
GND
20
V
19
OEb
18
Ya0
17
Ib0
16
Ya1
15
Ib1
14
Ya2
13
Ib2
12
Ya3
Ib3
SF00227
CC
LOGIC SYMBOL
1
OEa
OEb19
V
= Pin 20
CC
GND = Pin 10
74F (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
20µA/0.2mA
2 4 6 8 17 15 13 11
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
18 16 14 12 3 5 7 9
SF00228
1994 Dec 05 853-1525 14380
2
Philips Semiconductors Product specification
SYMBOL
PARAMETER
Octal buffer with 30Ω equivalent output termination
(3-State)
IEC/IEEE SYMBOL
1
19
2
4
6
8
17
15
13
11
EN1
EN2
2D
1
2
18
16
14
12
3
5
7
9
SF00229
FUNCTION TABLE
INPUTS OUTPUTS
OEa Ia OEb Ib Ya Yb
L L L L L L
L H L H H H
H X H X Z Z
Notes to function table
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance ”off” state
LOGIC DIAGRAM
Ia0
Ia1
Ia2
Ia3
OEa
V
= Pin 20
CC
GND = Pin 10
74F2244
2
4
6
8
1
18
Ya0
16
Ya1
14
Ya2
12
Ya3
Ib0
Ib1
Ib2
Ib3
OEb
17
15
13
11
10
2
Yb0
5
Yb1
7
Yb2
9
Yb3
SF00236
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage –0.5 to +7.0 V
Input voltage –0.5 to +7.0 V
Input current –30 to +5 mA
Voltage applied to output in high output state –0.5 to V
Current applied to output in low output state
Operating free air temperature range 0 to +70
Storage temperature range –65 to +150
PARAMETER RATING UNIT
CC
10 mA
RECOMMENDED OPERATING CONDITIONS
LIMITS UNIT
MIN NOM MAX
5 mA
V
V
V
I
I
I
T
Ik
OH
OL
amb
CC
IH
IL
PARAMETER
Supply voltage 4.5 5.0 5.5 V
High–level input voltage 2.0 V
Low–level input voltage 0.8 V
Input clamp current –18 mA
High–level output current –15 mA
Low–level output current
Operating free air temperature range 0 +70
V
°C
°C
°C
1994 Dec 05
3
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