DS1678 - National Semiconductor

TL/F/7506

DS1648/DS3648/DS1678/DS3678 TRI-STATE TTL to MOS Multiplexers/Drivers

February 1986

DS1648/DS3648/DS1678/DS3678 TRI-STATEÉTTL 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 15Xresistor 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

YTRI-STATE outputs interface directly with system-bus

YSchottky-clamped for better ac performance

YPNP inputs to minimize input loading

YTTL compatible

YHigh-speed capacitive load drivers

YBuilt-in damping resistor (DS1648/DS3648 only)

Logic and Connection Diagrams

TL/F/7506–1

Dual-In-Line Package

TL/F/7506–2

Top View

Order Number DS1648J, DS3648J, DS1678J

DS3678J, DS3648N or DS3678N

See NS Package Number J16A or N16A

TRI-STATEÉis a registered trademark of National Semiconductor Corp.

C1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

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§Ctoa

150§C

Maximum Power Dissipation*at 25§C

Cavity Package 1433 mW

Molded Package 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 Max Units

Supply Voltage (VCC) 4.5 5.5 V

Temperature (TA)

DS1648, DS1678 b55 a125 §C

DS3648, DS3678 0 a70 §C

Electrical Characteristics (Notes 2 and 3)

Symbol Parameter Conditions Min Typ Max Units

VIN(1) Logical ‘‘1’’ Input Voltage 2.0 V

VIN(0) Logical ‘‘0’’ Input Voltage 0.8 V

IIN(1) Logical ‘‘1’’ Input Current VCC e5.5V, VIN e5.5V 0.1 40 mA

IIN(0) Logical ‘‘0’’ Input Current VCC e5.5V, VIN e0.5V b50 b250 mA

VCLAMP Input Clamp Voltage VCC e4.5V, IIN eb

18 mA b0.75 b1.2 V

VOH Logical ‘‘1’’ Output Voltage VCC e4.5V, IOH eb

10 mA DS1648/DS1678 2.7 3.6 V

(No Load) DS3648/DS3678 2.8 3.6 V

VOL Logical ‘‘0’’ Output Voltage VCC e4.5V, IOL e10 mA DS1648/DS1678 0.25 0.4 V

(No Load) DS3648/DS3678 0.25 0.35 V

VOH Logical ‘‘1’’ Output Voltage VCC e4.5V, IOH eb

1.0 mA DS1648 2.4 3.5 V

(With Load) DS1678 2.5 3.5 V

DS3648 2.6 3.5 V

DS3678 2.7 3.5 V

VOL Logical ‘‘0’’ Output Voltage VCC e4.5V, IOL e20 mA DS1648 0.6 1.1 V

(With Load) DS1678 0.4 0.5 V

DS3648 0.6 1.0 V

DS3678 0.4 0.5 V

I1D Logical ‘‘1’’ Drive Current VCC e4.5V, VOUT e0V, (Note 4) b250 mA

I0D Logical ‘‘0’’ Drive Current VCC e4.5V, VOUT e4.5V, (Note 4) 150 mA

IHi-Z TRI-STATE Output Current VOUT e0.4V to 2.4V, Output Control e2.0V b40 40 mA

ICC Power Supply Current VCC e5.5V Output Control e3V 42 60 mA

All Other Inputs at 0V

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§Ctoa

125§C temperature range for the DS1648 and DS1678 and across the 0§Cto

70§C range for the DS3648 and DS3678. All typical values for TAe25§C and VCC e5V.

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 15Xresistor should be placed in series with each output. This

resistor is internal to the DS1648/DS3648 and need not be added.

Switching Characteristics VCC e5V, TAe25§C (Note 4)

Symbol Parameter Conditions Min Typ Max Units

tSgStorage Delay Negative Edge

(Figure 1)

CLe50 pF 5 7 ns

CLe500 pF 9 12 ns

tS’Storage Delay Positive Edge

(Figure 1)

CLe50 pF 6 8 ns

CLe500 pF 9 13 ns

tFFall Time

(Figure 1)

CLe50 pF 5 8 ns

CLe500 pF 22 35 ns

tRRise Time

(Figure 1)

CLe50 pF 6 9 ns

CLe500 pF 22 35 ns

tZL Delay from Output Control Input to Logical ‘‘0’’ CLe50 pF, RLe2kXto VCC,10 15 ns

Level (from High Impedance State)

(Figure 2)

tZH Delay from Output Control Input to Logical ‘‘1’’ CLe50 pF, RLe2kXto GND 815ns

Level (from High Impedance State)

(Figure 2)

tLZ Delay from Output Control Input to High Impedance CLe50 pF, RLe400Xto VCC,15 25 ns

State (from Logical ‘‘0’’ Level)

(Figure 3)

tHZ Delay from Output Control Input to High Impedance CLe50 pF, RLe400Xto GND, 10 25 ns

State (from Logical ‘‘1’’ Level)

(Figure 3)

tSgPropagation Delay to Logical ‘‘0’’ Transition When CLe50 pF,

(Figure 1)

12 15 ns

Select Selects A

tS’Propagation Delay to Logical ‘‘1’’ Transition When CLe50 pF,

(Figure 1)

14 17 ns

Select Selects A

tSgPropagation Delay to Logical ‘‘0’’ Transition When CLe50 pF,

(Figure 1)

16 20 ns

Select Selects B

tS’Propagation Delay to Logical ‘‘1’’ Transition When CLe50 pF,

(Figure 1)

14 20 ns

Select Selects B

Schematic Diagram

TL/F/7506–3

*DS1648/DS3648 only

AC Test Circuits and Switching Time Waveforms

tSg,t

TL/F/7506–4

TL/F/7506–5

Note 1: The pulse generator has the following characteristics: ZOUT e50Xand PRR s1 MHz. Rise and fall times between 10% and 90% points s5 ns.

Note 2: CLincludes probe and jig capacitance.

FIGURE 1

tZH

TL/F/7506–6

*Internal on DS1648 and DS3648

tZL

TL/F/7506–7

TL/F/7506–8

FIGURE 2

tHZ

TL/F/7506–9

*Internal on DS1648 and DS3648

tLZ

TL/F/7506–10

TL/F/7506–11

FIGURE 3

Truth Table

Output Inputs Outputs

Control Select A B

H X X X Hi-Z

LLLXH

LLHXL

LHXLH

LHXHL

High level

LeLow level

XeDon’t care

Hi-Z eTRI-STATE mode

Typical Applications

Addressing 16k RAM

TL/F/7506–12

2:1 Multiplexing of RAM Outputs

TL/F/7506–14

Refreshing Using TRI-STATE Counter

TL/F/7506–13

DS1648/DS3648/DS1678/DS3678 TRI-STATE TTL to MOS Multiplexers/Drivers

Physical Dimensions inches (millimeters)

Ceramic Dual-in-Line Pkg (J)

Order Number DS1648J, DS3648J, DS1678J or DS3678J

See NS Package Number J16A

Molded Dual-in-Line Pkg (N)

Order Number DS3648N or DS3678N

See NS Package Number N16A

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SEMICONDUCTOR CORPORATION. As used herein:

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systems which, (a) are intended for surgical implant support device or system whose failure to perform can

into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life

failure to perform, when properly used in accordance support device or system, or to affect its safety or

with instructions for use provided in the labeling, can effectiveness.

be reasonably expected to result in a significant injury

to the user.

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