SN75ALS121N-00 [TI]

DUAL LINE DRIVER, PDIP16;


型号：	SN75ALS121N-00
厂家：	TEXAS INSTRUMENTS
描述：	DUAL LINE DRIVER, PDIP16 驱动光电二极管接口集成电路驱动器
文件：	总7页 (文件大小：85K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ꢀꢁ ꢂꢃ ꢄꢅ ꢀꢆ ꢇꢆ

ꢈꢉꢄ ꢅꢊꢅ ꢋ ꢁꢌ ꢊꢈ ꢍꢋ ꢎ ꢌ ꢍ

ꢏ

SLLS030A − D1334, SEPTEMBER 1987 − REVISED AUGUST 1989

D OR N PACKAGE

(TOP VIEW)

• Permits Digital Data Transmission Over

Coaxial Cable, Strip Line, or Twisted Pair

• Operates With 50-Ω to 500-Ω Transmission

Lines

• TTL Compatible With 5-V Supply

• 2.4-V Output at I

= −75 mA

13 2D

12 2C

• Uncommitted Emitter-Follower Output

Structure for Party-Line Operation

• IMPACT Low-Power Schottky Technology

GND

• Improved Replacement for the SN75121

and Signetics 8T13

• Glitchless Power Up/Power Down

• Short-Circuit Protection

NOT RECOMMENDED FOR NEW DESIGN

• AND-OR Logic Configuration

• High Speed . . . Maximum Propagation

FUNCTION TABLE

INPUTS

OUTPUT

Delay Time of 14 ns at C = 15 pF

description

The SN75ALS121 dual line driver is designed for

digital data transmission over lines having

impedances from 50 to 500 Ω. It is compatible with

standard TTL logic and supply voltage levels.

All other input combinations

H = high level, L = low level, X = irrelevant

The low-impedance emitter-follower outputs drive terminated lines such as coaxial cable, strip line, or twisted

pair. Having the outputs uncommitted allows wired-OR logic to be performed in party-line applications. Output

short-circuit protection is provided by an internal clamping network that turns on when the output voltage drops

below approximately 1.5 V. All inputs are in conventional TTL configuration. Gating can be used during power-up

and power-down sequences to ensure that no noise is introduced on the line.

The SN75ALS121 employs the IMPACT process to achieve fast switching speeds, low power dissipation, and

reduced input current requirements.

The SN75ALS121 is characterized for operation from 0°C to 70°C.

IMPACT is a trademark of Texas Instruments Incorporated.

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2−1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

ꢀꢁ ꢂ ꢃꢄ ꢅ ꢀꢆ ꢇ ꢆ

ꢈ ꢉ ꢄꢅꢊ ꢅ ꢋ ꢁꢌ ꢊꢈ ꢍꢋ ꢎ ꢌꢍ

ꢏ

SLLS030A − D1334, SEPTEMBER 1987 − REVISED AUGUST 1989

†

logic symbol

logic diagram (positive logic)

≥ 1

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and

IEC Publication 617-12.

schematics of inputs and outputs

EQUIVALENT OF EACH INPUT

TYPICAL OF ALL OUTPUTS

25 kΩ

17 Ω

Input

GND

Y Output

GND

2−2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

ꢀꢁꢂ ꢃꢄ ꢅꢀ ꢆꢇ ꢆ

ꢈꢉꢄ ꢅꢊꢅ ꢋ ꢁꢌ ꢊ ꢈꢍ ꢋ ꢎꢌ ꢍ

ꢏ

SLLS030A − D1334, SEPTEMBER 1987 − REVISED AUGUST 1989

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, V

(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V

Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V

Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V

Continuous total dissipation at (or below) 25°C free air temperature . . . . . . . . See Dissipation Rating Table

Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C

Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 65°C to 150°C

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C

NOTE 1: All voltage values are with respect to network ground terminal.

DISSIPATION RATING TABLE

≤ 25°C

OPERATING FACTOR

T = 70°C

POWER RATING

PACKAGE

POWER RATING

ABOVE T = 25°C

950 mW

7.6 mW/°C

9.2 mW/°C

608 mW

1150 mW

736 mW

recommended operating conditions

MIN NOM

MAX

UNIT

Supply voltage, V

4.75

5.25

High-level input voltage, V

Low-level input voltage, V

0.8

− 75

High-level output current, I

°C

Operating free-air temperature range, T

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted)

†

PARAMETER

Input clamp voltage

TEST CONDITIONS

I = −12 mA

MIN

MAX

UNIT

TYP

= 5 V,

− 1.5

Input breakdown voltage

High-level output voltage

I = 10 mA

5.5

2.4

(BR)I

= 2 V,

= −75 mA,

See Note 2

V = 2 V,

3.2

= 5 V,

= 25°C,

= 4.5 V,

High-level output current

− 100 − 200 − 250

See Note 2

Low-level output current

Off-state output current

High-level input current

Low-level input current

= 0.8 V,

= 0.4 V,

See Note 2

− 800

500

µA

= 3 V

= 3 V,

O(off)

V = 4.5 V

µA

V = 0.4 V

− 250

µA

Short-circuit output current

Supply current, outputs high

Supply current, outputs low

= 5 V

− 5

− 30

= 5.25 V,

All inputs at 2 V,

No load

CCH

CCL

All inputs at 0.8 V,

†

All typical values are at V

= 5 V and T = 25°C.

NOTE 2: The output voltage and current limits are ensured for any appropriate combination of high and low inputs specified by the function table

for the desired output.

2−3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

ꢀꢁ ꢂ ꢃꢄ ꢅ ꢀꢆ ꢇ ꢆ

ꢈ ꢉ ꢄꢅꢊ ꢅ ꢋ ꢁꢌ ꢊꢈ ꢍꢋ ꢎ ꢌꢍ

ꢏ

SLLS030A − D1334, SEPTEMBER 1987 − REVISED AUGUST 1989

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Propagation delay time, low-to-high-level output

Propagation delay time, high-to-low-level output

Propagation delay time, low-to-high-level output

Propagation delay time, high-to-low-level output

PLH

PHL

PLH

PHL

= 37 Ω,

= 15 pF,

See Figure 1

= 1000 pF, See Figure 1

†

All typical values are at V

= 5 V and T = 25°C.

PARAMETER MEASUREMENT INFORMATION

3 V

Pulse

Generator

(see Note A)

Output

(see Note B)

TEST CIRCUIT

≤ 5 ns

3 V

0 V

90%

1.5 V

90%

1.5 V

Input

10%

PLH

PHL

Output

1.5 V

VOLTAGE WAVEFORMS

NOTES: A. The pulse generator has the following characteristics: Z = 50 Ω, t = 200 ns, duty cycle = 50%.

B. C includes probe and jig capacitance.

Figure 1. Test Circuit and Voltage Waveforms

2−4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

ꢀꢁꢂ ꢃꢄ ꢅꢀ ꢆꢇ ꢆ

ꢈꢉꢄ ꢅꢊꢅ ꢋ ꢁꢌ ꢊ ꢈꢍ ꢋ ꢎꢌ ꢍ

ꢏ

SLLS030A − D1334, SEPTEMBER 1987 − REVISED AUGUST 1989

TYPICAL CHARACTERISTICS

OUTPUT CURRENT

OUTPUT VOLTAGE

− 300

− 250

− 200

− 150

− 100

− 50

= 5 V

All inputs at 2 V

= 25 °C

− Output Voltage − V

Figure 2

2−5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

ꢀꢁ ꢂ ꢃꢄ ꢅ ꢀꢆ ꢇ ꢆ

ꢈ ꢉ ꢄꢅꢊ ꢅ ꢋ ꢁꢌ ꢊꢈ ꢍꢋ ꢎ ꢌꢍ

ꢏ

SLLS030A − D1334, SEPTEMBER 1987 − REVISED AUGUST 1989

2−6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

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SN75ALS121N-00 [TI]

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