74f244b NXP Semiconductors, 74f244b Datasheet - Page 2

• Manufacturer Part Number: 74f244b
• Description: Octal Buffers 3-state
• Manufacturer: NXP Semiconductors

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