Fairchild DM74ALS540A service manual
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DM74ALS540A
Octal Inverting Buffer and Line Driver
with 3-STATE Outputs
DM74ALS540A Octal Inverting Buffer and Line Driver with 3-STATE Outputs
October 1986
Revised February 2000
General Description
This octal buffer and line driver is designed to have the performance of the DM74ALS240A serie s and, at the same
time, offer a pinout with inputs and outputs on opposite
sides of the package. Th is arrangement gr eatly enhances
printed circuit board l ayout. Th e 3-STATE control gate is a
2-input NOR such that if either G
outputs are in the high impedance state.
1 or G2 is HIGH, all eight
Features
■ Advanced oxide-isolated, ion-implanted Schottky TTL
process
■ Switching perform ance is guarant eed over full tem perature and V
■ Data flow-thru pi nout (All inputs on op posite side from
outputs)
■ P-N-P inputs reduce DC loading
supply range
CC
Ordering Code:
Order Number Package Number Package Description
DM74ALS540AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS540ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS540AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.
Connection Diagram Function Table
Inputs Output
1G 2A Y
G
H X X Hi-Z
X H X Hi-Z
LLLH
LLHL
H = HIGH Logic Level
L = LOW Logic Level
X = Don't Care (Either HIGH or LOW Logic Level)
Hi-Z = High Impedance (OFF) State
© 2000 Fairchild Semiconductor Corporation DS009170 www.fairchildsemi.com
Absolute Maximum Ratings(Note 1)
Supply Voltage 7V
Input Voltage 7V
Voltage Applied to a
Disabled 3-STATE Output 5.5V
Operating Free-Air Temperature Range 0°C to +70°C
DM74ALS540A
Storage Temperature Range −65°C to +150°C
Typical θ
JA
N Package 58.5°C/W
Note 1: The “Absolute Maximum Ratin gs” are those v alues beyon d which
the safety of the dev ice cannot be guaranteed. T he device sh ould 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 c ondit ions
for actual device operation.
M Package 77.5°C/W
Recommended Operating Conditions
Symbol Parameter Min Nom Max Units
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage 4.5 5 5.5 V
HIGH Level Input Voltage 2 V
LOW Level Input Voltage 0.7 V
HIGH Level Output Current −15 mA
LOW Level Output Current 24 mA
Free Air Operating Temperature 0 70 °C
Electrical Characteristics
over recommended free air temperature range
Symbol Parameter Test Conditions Min Typ Max Units
V
V
V
I
I
I
I
I
I
I
IK
OH
OL
I
IH
IL
OZH
OZL
O
CC
Input Clamp Voltage VCC = Min, II = −18 mA −1.5 V
HIGH Level VCC = 4.5V to 5.5V IOH = −0.4 mA VCC − 2
Output Voltage VCC = Min IOH = −3 mA 2.4 3.2 V
IOH = Max 2
LOW Level VCC = Min IOL = 12 mA 0.25 0.4
Output Voltage IOL = 24 mA 0.35 0.5
Input Current @ Maximum Input Voltage VCC = Max, VI = 7V 100 µA
HIGH Level Input Current VCC = Max, VI = 2.7V 20 µA
LOW Level Input Current VCC = Max, VI = 0.4V −100 µA
HIGH Level 3-STATE Output Current VCC = Max, VO = 2.7V 20 µA
LOW Level 3-STATE Output Current VCC = Max, VO = 0.4V −20 µA
Output Drive Current VCC = Max, VO = 2.25V −30 −112 mA
Supply Current VCC = Max Outputs HIGH 5 10
Outputs LOW 13 22 mA
Outputs Disabled 11 19
mA
Switching Characteristics
over recommended free air operating temperature range
Symbol Parameter Conditions
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
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Propagation Delay Time VCC = 4.5V to 5.5V,
LOW-to-HIGH Level Output R1 = R2 = 500Ω,
Propagation Delay Time CL = 50 pF
HIGH-to-LOW Level Output
Output Enable Time to HIGH Level Output G to Y 5 15 ns
Output Enable Time to LOW Level Output G to Y 8 20 ns
Output Disable Time from HIGH Level Output G to Y 1 10 ns
Output Disable Time from LOW Level Output G to Y 2 12 ns
From (Input)
To (Output)
A or B to Y 2 12 ns
A or B to Y 2 9 ns
Min Max Units
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