Fairchild Semiconductor DM74S241N, DM74S240N Datasheet
August 1986
Revised May 2000
DM74S240 • DM74S241 • DM74S244
Octal 3-STATE Buffer/Line Driver/Line Receiver
DM74S240 • DM74S241 • DM74S244 Octal 3-STATE Buffer/Line Driver/Line Receiver
General Description
These buffers/line drivers are designed to improve both the
performance and PC board density of 3-STATE buffers/
drivers employed as memor y-address drivers, clock drivers, and bus-oriented transmitters/receivers. Featuring 400
mV of hysteresis at each low cu rrent PNP data lin e input,
they provide improve d noi se re jectio n and high fanout outputs, and can be used t o drive terminated lines down to
133Ω.
Features
■ 3-STATE outputs drive bus lines directly
■ PNP inputs reduce DC loading on bus lines
■ Hysteresis at data inputs improves noise margins
■ Typical I
■ Typical I
■ Typical propagation delay times
■ Typical enable/disable times 9 ns
■ Typical power dissipation (enabled)
(sink current) 64 mA
OL
(source current) −15 mA
OH
Inverting 4.5 ns
Noninverting 6 ns
Inverting 450 mW
Noninverting 538 mW
Ordering Code:
Order Number Package Number Package Description
DM74S240N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74S241N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74S244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagrams
DM74S240N
DM74S244N
© 2000 Fairchild Semiconductor Corporation DS006478 www.fairchildsemi.com
DM74S241N
Absolute Maximum Ratings(Note 1)
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Note 1: The “Absolute Maxim um Ratin gs” are those v alues beyon d which
the safety of the d evice cannot be guaranteed. The device sh ould not be
operated at these limit s. The parametric values defin ed in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions ” table will defin e the c ondit ions
for actual device operation.
Recommended Operating Conditions
Symbol Parameter Min Typ Max Units
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
DM74S240 • DM74S241 • DM74S244
Supply Voltage 4.75 5 5.25 V
HIGH Level Input Voltage 2 V
LOW Level Input Voltage 0.8 V
HIGH Level Output Current −15 mA
LOW Level Output Current 64 mA
Free Air Operating Temperature 0 70 °C
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
V
I
H
ys
V
OH
V
OL
I
OZH
I
OZL
I
I
I
IH
I
IL
I
OS
I
CC
Note 2: All typical values are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorte d at a t im e and duration shou ld not exceed one second.
Input Clamp Voltage VCC = Min, II = −18 mA −1.2 V
Hysteresis (VT+ − VT−)VCC = Min 0.2 0.4 V
(Data Inputs Only)
HIGH Level VCC = 4.75V, VIH = 2V
Output Voltage VIL = 0.8V, IOH = −1 mA
LOW Level VCC = Min IOL = Max
Output Voltage VIL = 0.8V, VIH = 2V
Off-State Output Current, VCC = Max VO = 2.4V
HIGH Level Voltage Applied V
Off-State Output Current, VIH = 2V VO = 0.5V
LOW Level Voltage Applied
Input Current at Maximum VCC = Max VI = 5.5V 1 mA
Input Voltage
HIGH Level Input Current VCC = Max VI = 2.7V 50 µA
LOW Level Input Current VCC = Max VI = 0.5V Any A −400 µA
Short Circuit Output Current VCC = Max (Note 3) −50 −225 mA
Supply Outputs HIGH DM74S240 80 135
Current DM74S241, DM74244 95 160
V
= Min, VIH = 2V
CC
= 0.8V, IOH = −3 mA
V
IL
VCC = Min, VIH = 2V
V
= 0.5V, IOH = Max
IL
= 0.8V
IL
Any G −2mA
Outputs LOW DM74S240 100 150
Outputs Disabled DM74S240 100 150
DM74S241, DM74244 120 180
DM74S241, DM74S244 120 180
2.7
2.4 3.4
2
Typ
(Note 2)
Max Units
V
0.55 V
50 µA
−50 µA
mA
www.fairchildsemi.com 2
Loading...