Philips 74als241a DATASHEETS
INTEGRATED CIRCUITS
74ALS241A/74ALS241A–1
Octal buffer (3–state)
Product specification
IC05 Data Handbook
1991 Feb 08
Philips Semiconductors Product specification
74ALS241A/74ALS241A-1Octal buffer (3-State)
FEA TURES
•Octal bus interface
•3-State buffer outputs sink 24mA and source 15mA
•The -1 version sinks 48 mA
DESCRIPTION
The 74ALS241A is an octal buffer that is ideal for driving bus lines or
buffer memory address registers. The outputs are all capable of
sinking 24mA and sourcing up to 15mA, producing very good
capacitive drive characteristics. The device features two output
enables, OE
The 74ALS241A-1 sinks 48mA IOL if the VCC is limited to
5.0V ±0.25V.
74ALS241A-1 4.5ns 18mA
a and OEb, each controlling four of the 3-State outputs.
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS241A 4.5ns 18mA
PIN CONFIGURATION
1
OEa
2
Ia0
3
Yb0
4
Ia1
5
Yb1
6
Ia2
7
Yb2
8
Ia3
9
Yb3
10 11
GND
ORDERING INFORMA TION
ORDER CODE
COMMERCIAL RANGE
DESCRIPTION
20-pin plastic DIP
20-pin plastic SOL
20-pin plastic SSOP
Type II
V
CC
T
amb
74ALS241AN,
74ALS241A-1N
74ALS241AD,
74ALS241A-1D
74ALS241ADB,
74ALS241A-1DB
V
20
CC
19
OEb
18
Ya0
17
Ib0
16
Ya1
15
Ib1
14
Ya2
13
Ib2
12
Ya3
Ib3
= 5V ±10%,
= 0°C to +70°C
SF00324
DRAWING
NUMBER
SOT146-1
SOT163-1
SOT339-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
Ian, Ibn Data inputs 1.0/1.0 20µA/0.1mA
OEa, OEb Output Enable inputs (active-Low) 1.0/1.0 20µA/0.1mA
Yan, Ybn Data outputs 750/240 15mA/24mA
Yan, Ybn Data outputs (-1 version) 750/480 15mA/48mA
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
1
OEa
19
VCC = Pin 20
GND = Pin 10
OEb
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
SF00325
IEC/IEEE SYMBOL
74ALS (U.L.)
HIGH/LOW
1
19
2
4
6
8
17
15
13
11
EN1
EN2
2D
1
2
LOAD VALUE
HIGH/LOW
18
16
14
12
3
5
7
9
SF00326
1991 Feb 08 853–1276 01670
2
Philips Semiconductors Product specification
I
Current applied to output in Low output state
SYMBOL
UNIT
IOLLow-level output current
74ALS241A/74ALS241A-1Octal buffer (3-State)
LOGIC DIAGRAM
2
Ia0
4
Ia1
6
Ia2
8
Ia3
1
OE
a
VCC = Pin 20
GND = Pin 10
18
Ya0
16
Ya1
14
Ya2
12
Ya3
Ib0
Ib1
Ib2
Ib3
OEb
17
15
13
11
10
3
5
7
9
Yb0
Yb1
Yb2
Yb3
SF00327
FUNCTION TABLE
OEa Ia OEb Ib Ya Yb
L L H L L L
L H H H H H
H X L X Z Z
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
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
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
pp
p
Operating free-air temperature range 0 to +70 °C
Storage temperature range –65 to +150 °C
PARAMETER RATING UNIT
p
All versions 48 mA
-1 version 96 mA
INPUTS OUTPUTS
CC
V
RECOMMENDED OPERATING CONDITIONS
PARAMETER
V
CC
V
V
I
IK
I
OH
T
amb
NOTE:
1. The 48mA limit applies only under the condition of V
Supply voltage 4.5 5.0 5.5 V
High-level input voltage 2.0 V
IH
Low-level input voltage 0.8 V
IL
Input clamp current –18 mA
High-level output current –15 mA
p
Operating free-air temperature range 0 +70 °C
CC
= 5.0V ±5%.
LIMITS
MIN NOM MAX
All versions 24 mA
-1 version 48
1
mA
1991 Feb 08
3
Loading...