NSC DS8925MX, DS8925M Datasheet

DS8925 LocalTalk

™

Dual Driver/Triple Receiver

General Description

The DS8925 is a dual driver/triple receiver device optimized to provide a single chip solution for a LocalTalk Interface. The device provides one differential TIA/EIA-422 driver,one TIA/EIA-423 single ended driver, one TIA/EIA-422 receiver and two TIA/EIA-423receivers,all in a surface mount 16 pin package. This device is electrically similar to the 26LS30 and 26LS32 devices.

The drivers feature

±

10V common mode range, and the differential driver provides TRI-STATEable outputs. The receivers offer

±

200 mV thresholds over the±10V common mode

range.

Features

n Single chip solution for LocalTalk port n Two driver/three receivers per package n Wide common mode range:

±

10V

n

±

200 mV receiver sensitivity

n 70 mV typical receiver input hysteresis n Available in SOIC packaging

Connection Diagram Functional Diagram

TRI-STATE®is a registered trademark of National Semiconductor Corporation. LocalTalk

™

is a trademark of Apple Computer Incorporated.

Dual-In-Line Package

DS011895-1

Order Number DS8925M

See NS Package Number M16A

DS011895-2

December 1998

DS8925 LocalTalk Dual Driver/Triple Receiver

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 (V

CC

) +7V

Supply Voltage (V

EE

) −7V

Enable Input Voltage (D

EN1

) +7V

Driver Input Voltage (D

IN

) +7V

Driver Output Voltage (Power Off: D

OUT

)

±

15V

Receiver Input Voltage

(V

ID:RIN

+−RIN−)

±

25V

Receiver Input Voltage

(V

CM

:(RIN++RIN−)/2)

±

25V

Receiver Input Voltage

(Input to GND: R

IN

)

±

25V

Receiver Output Voltage (R

OUT

) +5.5V

Maximum Package Power Dissipation

@

+25˚C M Package 1.33W

Derate M Package 10.6 mW/˚C above

+25˚C Storage Temperature Range −65˚C to +150˚C Lead Temperature Range

(Soldering, 4 Sec.) +260˚C

This Device Does Not Meet 2000V ESD Rating (Note 7)

Recommended Operating Conditions

Min Typ Max Units

Supply Voltage (V

CC

) +4.75 +5.0 +5.25 V

Supply Voltage (V

EE

) −4.75 −5.0 −5.25 V

Operating Free Air

Temperature (T

A

) 0 25 70 ˚C

Electrical Characteristics (Notes 2, 3)

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified

Symbol Parameter Conditions Pin Min Typ Max Units

DIFFERENTIAL DRIVER CHARACTERISTICS

V

OD

Output Differential Voltage R

L

=

∞

or R

L

=

3.9 kΩ

D

OUT

+,

D

OUT

−

±7±

9.0

±

10 V

V

O

Output Voltage R

L

=

∞

or R

L

=

3.9 kΩ

±

4.5±5.25 V

V

OD1

Output Differential Voltage R

L

=

100Ω,

Figure 1

4.0 6.4 |V|

V

SS

|V

OD1−VOD1

*

| 8.0 12.8 |V|

∆V

OD1

Output Unbalance 0.02 0.4 V

V

OS

Offset Voltage 03V

∆V

OS

Offset Unbalance 0.05 0.4 V

V

OD2

Output Differential Voltage RL=140Ω,

Figure 1

6.0 7.0 |V|

I

OZD

TRI-STATE®Leakage Current V

CC

=

5.25V V

O

=

+10V 2 150 µA

V

EE

=

−5.25V V

O

=

+6V 1 100 µA

V

O

=

−6V −1 −100 µA

V

O

=

−10V −2 −150 µA

SINGLE ENDED DRIVER CHARACTERISTICS

V

O

Output Voltage (No Load) R

L

=

∞

or R

L

=

3.9 kΩ,

Figure 2

D

OUT

−

4 4.4 6 |V|

V

T

Output Voltage R

L

=

3kΩ,

Figure 2

3.7 4.3 |V|

R

L

=

450Ω,

Figure 2

3.6 4.1 |V|

∆V

T

Output Unbalance 0.02 0.4 V

DRIVER CHARACTERISTICS

V

CM

Common Mode Range Power Off, or D1 Disabled

D

OUT

+,

D

OUT

−

±

10 V

I

OSD

Short Circuit Current V

O

=

0V, Sourcing Current −80 −150 mA

V

O

=

0V, Sinking Current 80 150 mA

I

OXD

Power-Off Leakage Current (V

CC

=

V

EE

=

0V)

V

O

=

+10V 2 150 µA

V

O

=

+6V 1 100 µA

V

O

=

−6V −1 −100 µA

V

O

=

−10V −2 −150 µA

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Electrical Characteristics (Notes 2, 3) (Continued)

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified

Symbol Parameter Conditions Pin Min Typ Max Units

RECEIVER CHARACTERISTICS

V

TH

Input Threshold −7V ≤ VCM≤ +7V

R

IN

+,

R

IN

−

−200

±

35 +200 mV

V

HY

Hysteresis V

CM

=

0V 70 mV

R

IN

Input Resistance −10V ≤ VCM≤ +10V 6.0 8.5 kΩ

I

IN

Input Current (Other Input=0V, Power On, or V

CC

=

V

EE

=

0V)

V

IN

=

+10V 3.25 mA

V

IN

=

+3V 0 1.50 mA

V

IN

=

−3V 0 −1.50 mA

V

IN

=

−10V −3.25 mA

V

IB

Input Balance Test R

S

=

500Ω (R2 only)

±

400 mV

V

OH

High Level Output Voltage I

OH

=

−400 µA,

R

OUT

2.7 4.2 V

V

IN

=

+200 mV

I

OH

=

−400 µA, V

IN

=

OPEN 2.7 4.2 V

V

OL

Low Level Output Voltage I

OL

=

8.0 mA, V

IN

=

−200 mV 0.3 0.5 V

I

OSR

Short Circuit Current V

O

=

0V −15 −34 −85 mA

DEVICE CHARACTERISTICS

V

IH

High Level Input Voltage

D

IN

,

D

EN1

2.0 V

V

IL

Low Level Input Voltage 0.8 V

I

IH

High Level Input Current V

IN

=

2.4V 1 40 µA

I

IL

Low Level Input Current V

IN

=

0.4V −10 −200 µA

V

CL

Input Clamp Voltage I

IN

=

−12 mA −1.5 V

I

CC

Power Supply Current No Load V

CC

40 65 mA

I

EE

D1 Enabled or Disabled V

EE

−5 −15 mA

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Switching Characteristics (Notes 4, 5)

Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

DIFFERENTIAL DRIVER CHARACTERISTICS

t

PHLD

Differential Propagation Delay High to Low R

L

=

100Ω,C

L

=

500 pF,

(

Figures 3, 4

)

C

1

=

C

2

=

50 pF

70 134 350 ns

t

PLHD

Differential Propagation Delay Low to High 70 141 350 ns

t

SKD

Differential Skew |t

PHLD−tPLHD

| 7 50 ns

t

r

Rise Time 50 140 300 ns

t

f

Fall Time 50 140 300 ns

t

PHZ

Disable Time High to Z R

L

=

100Ω,C

L

=

500 pF

(

Figures 7, 8

)

300 600 ns

t

PLZ

Disable Time Low to Z 300 600 ns

t

PZH

Enable Time Z to High 160 350 ns

t

PZL

Enable Time Z to Low 160 350 ns

SINGLE ENDED DRIVER CHARACTERISTICS

t

PHL

Propagation Delay High to Low R

L

=

450Ω,C

L

=

500 pF

(

Figures 5, 6

)

70 120 350 ns

t

PLH

Propagation Delay Low to High 70 150 350 ns

t

SK

Skew, |t

PHL−tPLH

30 70 ns

t

r

Rise Time 50 100 300 ns

t

f

Fall Time 20 50 300 ns

RECEIVER CHARACTERISTICS

t

PHL

Propagation Delay High to Low C

L

=

15 pF

(

Figures 9, 10

)

10 33 75 ns

t

PLH

Propagation Delay Low to High 10 30 75 ns

t

SK

Skew, |t

PHL−tPLH

| 320ns

Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of Electrical Characteristics specifies conditions of device operation.

Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except V

OD,VOD1

,

V

OD2

, and VSS.

Note 3: All typicals are given for: V

CC

=

+5.0V, V

EE

=

−5.0V, T

A

=

+25˚C unless otherwise specified.

Truth Tables

Driver (D1)

Inputs Outputs

D

EN1

D

IN1

D

OUT1

+D

OUT1

−

HX Z Z LL L H LH H L

Driver (D2)

Input Output

D

IN2

D

OUT2

−

LH HL

H

=

Logic High Level (Steady State) L=Logic Low Level (Steady State) X=Irrelevant (Any Input) Z=Off State (TRI-STATE, High Impedance)

†

OPEN=Non-Terminated

Receiver (1)

Input Output R

IN1

−R

OUT1

≤−200 mV H ≥+200 mV L

OPEN

†

H

Receiver (2)

Inputs Output

R

IN2

+−R

IN2

−R

OUT2

≤−200 mV L ≥+200 mV H

OPEN

†

H

Receiver (3)

Input Output R

IN3

+R

OUT3

≤−200 mV L ≥+200 mV H

OPEN

†

H

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Parameter Measurement Information

DS011895-3

FIGURE 1. Differential Driver DC Test Circuit

DS011895-4

FIGURE 2. Single Ended Driver DC Test Circuit

DS011895-5

FIGURE 3. Differential Driver Propagation Delay and Transition Time Test Circuit

DS011895-6

FIGURE 4. Differential Driver Propagation Delay and Transition Time Waveforms

DS011895-7

FIGURE 5. Single Ended Driver Propagation Delay and Transition Time Test Circuit

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