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February 1986
DS1648 DS3648 DS1678 DS3678 TRI-STATE TTL to
MOS Multiplexers Drivers
General Description
The DS1648 DS3648 and DS1678 DS3678 are quad 2-in-
put multiplexers with TRI-STATE outputs designed to drive
the large capacitive loads (up to 500 pF) associated with
MOS memory systems A PNP input structure is employed
to minimize input currents so that driver loading in large
memory systems is reduced The circuit employs Schottky-
clamped transistors for high speed and TRI-STATE outputs
for bus operation
The DS1648 DS3648 has a 15X resistor in series with the
outputs to dampen transients caused by the fast-switching
output The DS1678 DS3678 has a direct low impedance
output for use with or without an external resistor
Features
Y TRI-STATE outputs interface directly with system-bus
Y Schottky-clamped for better ac performance
Y PNP inputs to minimize input loading
Y TTL compatible
Y High-speed capacitive load drivers
Y Built-in damping resistor (DS1648 DS3648 only)
Logic and Connection Diagrams
Dual-In-Line Package
TL F 7506 – 1
Top View
TL F 7506 – 2
Order Number DS1648J DS3648J DS1678J
DS3678J DS3648N or DS3678N
See NS Package Number J16A or N16A
TRI-STATE is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation TL F 7506
RRD-B30M105 Printed in U S A

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Absolute Maximum Ratings (Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Logical ‘‘1’’ Input Voltage
7V
Logical ‘‘0’’ Input Voltage
b1 5V
Storage Temperature Range
b65 C to a150 C
Maximum Power Dissipation at 25 C
Cavity Package
Molded Package
1433 mW
1362 mW
Lead Temperature
(Soldering 10 seconds)
300 C
Derate cavity package 9 6 mW C above 25 C derate molded package
10 9 mW C above 25 C
Operating Conditions
Min
Supply Voltage (VCC)
Temperature (TA)
DS1648 DS1678
45
b55
DS3648 DS3678
0
Max
55
a125
a70
Units
V
C
C
Electrical Characteristics (Notes 2 and 3)
Symbol
Parameter
Conditions
Min Typ Max Units
VIN(1)
Logical ‘‘1’’ Input Voltage
20 V
VIN(0)
Logical ‘‘0’’ Input Voltage
08 V
IIN(1)
Logical ‘‘1’’ Input Current
VCC e 5 5V VIN e 5 5V
0 1 40 mA
IIN(0)
Logical ‘‘0’’ Input Current
VCC e 5 5V VIN e 0 5V
b50 b250 mA
VCLAMP Input Clamp Voltage
VCC e 4 5V IIN e b18 mA
b0 75 b1 2
VOH
Logical ‘‘1’’ Output Voltage VCC e 4 5V IOH e b10 mA DS1648 DS1678 2 7
36
(No Load)
DS3648 DS3678 2 8
36
V
V
V
VOL Logical ‘‘0’’ Output Voltage VCC e 4 5V IOL e 10 mA DS1648 DS1678
(No Load)
DS3648 DS3678
0 25 0 4
0 25 0 35
V
V
VOH
Logical ‘‘1’’ Output Voltage
(With Load)
VCC e 4 5V IOH e b1 0 mA
DS1648
DS1678
24 35
25 35
V
V
DS3648
26 35
V
DS3678
27 35
V
VOL
Logical ‘‘0’’ Output Voltage VCC e 4 5V IOL e 20 mA
DS1648
(With Load)
DS1678
06 11 V
04 05 V
DS3648
06 10 V
DS3678
04 05 V
I1D Logical ‘‘1’’ Drive Current VCC e 4 5V VOUT e 0V (Note 4)
I0D Logical ‘‘0’’ Drive Current VCC e 4 5V VOUT e 4 5V (Note 4)
IHi-Z TRI-STATE Output Current VOUT e 0 4V to 2 4V Output Control e 2 0V
ICC Power Supply Current
VCC e 5 5V Output Control e 3V
All Other Inputs at 0V
b40
b250
150
42
40
60
mA
mA
mA
mA
All Inputs at 0V
20 32 mA
Note 1 ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed Except for ‘‘Operating Temperature Range’’
they are not meant to imply that the devices should be operated at these limits The table of ‘‘Electrical Characteristics’’ provides conditions for actual device
operation
Note 2 Unless otherwise specified min max limits apply across the b55 C to a125 C temperature range for the DS1648 and DS1678 and across the 0 C to
a70 C range for the DS3648 and DS3678 All typical values for TA e 25 C and VCC e 5V
Note 3 All currents into device pins shown as positive out of device pins as negative all voltages referenced to ground unless otherwise noted All values shown
as max or min on absolute value basis
Note 4 When measuring output drive current and switching response for the DS1678 and DS3678 a 15X resistor should be placed in series with each output This
resistor is internal to the DS1648 DS3648 and need not be added
2

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Switching Characteristics VCC e 5V TA e 25 C (Note 4)
Symbol
Parameter
Conditions
tSg Storage Delay Negative Edge
tSStorage Delay Positive Edge
tF Fall Time
tR Rise Time
tZL Delay from Output Control Input to Logical ‘‘0’’
Level (from High Impedance State)
(Figure 1) CL e 50 pF
CL e 500 pF
(Figure 1) CL e 50 pF
CL e 500 pF
(Figure 1) CL e 50 pF
CL e 500 pF
(Figure 1) CL e 50 pF
CL e 500 pF
CL e 50 pF RL e 2 kX to VCC
(Figure 2)
tZH Delay from Output Control Input to Logical ‘‘1’’
Level (from High Impedance State)
CL e 50 pF RL e 2 kX to GND
(Figure 2)
tLZ Delay from Output Control Input to High Impedance CL e 50 pF RL e 400X to VCC
State (from Logical ‘‘0’’ Level)
(Figure 3)
tHZ Delay from Output Control Input to High Impedance CL e 50 pF RL e 400X to GND
State (from Logical ‘‘1’’ Level)
(Figure 3)
tSg
Propagation Delay to Logical ‘‘0’’ Transition When
Select Selects A
CL e 50 pF (Figure 1)
tS
Propagation Delay to Logical ‘‘1’’ Transition When
Select Selects A
CL e 50 pF (Figure 1)
tSg
Propagation Delay to Logical ‘‘0’’ Transition When
Select Selects B
CL e 50 pF (Figure 1)
tS
Propagation Delay to Logical ‘‘1’’ Transition When
Select Selects B
CL e 50 pF (Figure 1)
Min Typ Max Units
5 7 ns
9 12 ns
6 8 ns
9 13 ns
5 8 ns
22 35 ns
6 9 ns
22 35 ns
10 15 ns
8 15 ns
15 25 ns
10 25 ns
12 15 ns
14 17 ns
16 20 ns
14 20 ns
Schematic Diagram
DS1648 DS3648 only
TL F 7506 – 3
3

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AC Test Circuits and Switching Time Waveforms
tSg tSg TR tF
TL F 7506 – 5
TL F 7506 – 4
Note 1 The pulse generator has the following characteristics ZOUT e 50X and PRR s 1 MHz Rise and fall times between 10% and 90% points s 5 ns
Note 2 CL includes probe and jig capacitance
FIGURE 1
tZH tZL
Internal on DS1648 and DS3648
tHZ
TL F 7506–6
FIGURE 2
tLZ
TL F 7506 – 7
TL F 7506 – 8
Internal on DS1648 and DS3648
Truth Table
TL F 7506–9
FIGURE 3
Output
Control
Inputs
Select
A
H XX
L LL
L LH
L HX
L HX
H e High level
L e Low level
X e Don’t care
Hi-Z e TRI-STATE mode
4
B
X
X
X
L
H
TL F 7506 – 10
Outputs
Hi-Z
H
L
H
L
TL F 7506 – 11

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Typical Applications
Addressing 16k RAM
2 1 Multiplexing of RAM Outputs
TL F 7506 – 12
Refreshing Using TRI-STATE Counter
TL F 7506 – 14
TL F 7506 – 13
5