Fairchild Semiconductor DM74ALS240AWMX, DM74ALS240AWM, DM74ALS240ASJX, DM74ALS240ASJ, DM74ALS240AN Datasheet
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© 2000 Fairchild Semiconductor Corporation DS006210 www.fairchildsemi.com
September 1986
Revised February 2000
DM74ALS240A • DM74ALS241A Octal 3-STA TE Bus Driver
DM74ALS240A • DM74ALS241A
Octal 3-STATE Bus Driver
General Description
These octal 3-STATE bus drivers are designed to provide
the designer with flexibility in implementing a bus interface
with memory, microprocessor, or communication systems.
The output 3-STATE gating control is organized into two
separate groups of four buffers. The DM74ALS24 0A control inputs symmetrically enable the respective outputs
when set logic LOW, while the DM74ALS241A has complementary enable gating . The 3-STATE cir cuitry contains a
feature that maintains the buffer outp uts in 3-STATE (high
impedance state) during pow er supply ramp-up or rampdown. This eliminates bus glitching problems that arise
during power-up and power- do wn.
Features
■ Advanced low power oxide-isolated ion-implanted
Schottky TTL process
■ Functional and pin co mpatible with the DM74LS co unterpart
■ Improved switching per formance with less power dissipation compared with the DM74LS counterpart
■ Switching response specified into 500Ω and 50 pF load
■ Switching response specific ations guaranteed over full
temperat ure and V
CC
supply range
■ PNP input design reduces input loading
■ Low level drive current: 74ALS = 24 mA
Ordering Code:
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.
Connection Diagrams
DM74ALS240A DM74ALS241A
Order Number Package Number Package Description
DM74ALS240AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS240ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS240AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74ALS241AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS241AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
www.fairchildsemi.com 2
DM74ALS240A • DM74ALS241A
Function Tables
DM74ALS240A DM74ALS241A
Logic Diagrams
DM74ALS240A DM74ALS241A
Input Output
G
AY
LL H
LH L
HX Z
Input Output Input Output
1G
1A Y 2G 2A Y
LL L HL L
LH H HH H
HX Z LX Z
3 www.fairchildsemi.com
DM74ALS240A • DM74ALS241A
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute M aximu m R atin gs” are t hose valu es b eyo nd w hich
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions” t able w ill defin e the condition s
for actual device operation.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise specified)
Supply Voltage, V
CC
7V
Input Voltage 7V
Voltage Applied to Disabled Output 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Typical θ
JA
N Package 60.5°C/W
M Package 79.8°C/W
Symbol Parameter Min Typ Max Units
V
CC
Supply Voltage 4.5 5 5.5 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current −15 mA
I
OL
LOW Level Output Current 24 mA
T
A
Operating Free Air Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
V
IK
Input Clamp Voltage VCC = 4.5V, II = −18 mA −1.5 V
V
OH
HIGH Level VCC = 4.5V to 5.5V IOH = −0.4 mA VCC − 2V
Output Voltage VCC = 4.5V IOH = −3 mA 2.4 V
IOH = Max 2 V
V
OL
LOW Level VCC = 4.5V
0.35 0.5 V
Output Voltage IOL = Max
I
I
Input Current at Max
VCC = 5.5V, VI = 7V 0.1 mA
Input Voltage
I
IH
HIGH Level Input Current VCC = 5.5V, VI = 2.7V 20 µA
I
IL
LOW Level Input Current VCC = 5.5V, VIL = 0.4V −0.1 mA
I
O
Output Drive Current VCC = 5.5V, VO = 2.25V −30 −112 mA
I
OZH
HIGH Level 3-STATE
VCC = 5.5V, VO = 2.7V 20 µA
Output Current
I
OZL
LOW Level 3-STATE
VCC = 5.5V, VO = 0.4V −20 µA
Output Current
I
CC
Supply Current VCC = 5.5V, ALS240A
410mA
Outputs HIGH
Outputs LOW 13 23 mA
Outputs 3-STATE 14 25 mA
VCC = 5.5V, ALS241A
915mA
Outputs HIGH
Outputs LOW 15 26 mA
Outputs 3-STATE 17 30 mA
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