SN54BCT29841_08 [TI]

10-BIT BUS-INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS;


型号：	SN54BCT29841_08
厂家：	TEXAS INSTRUMENTS
描述：	10-BIT BUS-INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS 输出元件
文件：	总5页 (文件大小：77K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SN54BCT29841, SN74BCT29841

10-BIT BUS-INTERFACE D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCBS024C – MARCH 1989 – REVISED NOVEMBER 1993

SN54BCT29841 . . . JT OR W PACKAGE

SN74BCT29841 . . . DW OR NT PACKAGE

(TOP VIEW)

• State-of-the-Art BiCMOS Design

Significantly Reduces I

CCZ

• ESD Protection Exceeds 2000 V Per

MIL-STD-883C, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

23 1Q

22 2Q

21 3Q

20 4Q

19 5Q

18 6Q

17 7Q

16 8Q

15 9Q

14 10Q

13 LE

• Power-Up High-Impedance State

• Provides Extra Bus-Driving Latches

Necessary For Wider Address/Data Paths

or Buses With Parity

• Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic Chip

Carriers (FK) and Flatpacks (W), and

Standard Plastic and Ceramic 300-mil DIPs

(JT, NT)

9D 10

10D 11

GND 12

description

SN54BCT29841 . . . FK PACKAGE

(TOP VIEW)

These 10-bit bus-interface latches feature 3-state

outputs designed specifically for driving highly

capacitive or relatively low-impedance loads.

They are particularly suitable for implementing

wider buffer registers, I/O ports, bidirectional bus

drivers with parity, and working registers.

28 27 26

The ten latches of the ′BCT29841 are transparent

D-type latches. When the latch-enable (LE) input

ishigh, theQoutputswillfollowthedata(D)inputs.

When LE is taken low, the Q outputs are latched

at the levels that were set up at the D inputs.

22 NC

21 6Q

20 7Q

19 8Q

12 13 14 15 16 17 18

A buffered output-enable (OE) input can be used

to place the nine outputs in either a normal logic

state (high or low level) or a high-impedancestate.

In the high-impedance state, the outputs neither

load nor drive the bus lines significantly. The

high-impedancestateandincreaseddriveprovide

the capability to drive bus lines without need for

interface or pullup components.

NC – No internal connection

The output enable (OE) does not affect the internal operation of the latches. Old data can be retained or new

data can be entered while the outputs are in the high-impedance state.

The SN54BCT29841 is characterized for operation over the full military temperature range of –55°C to 125°C.

The SN74BCT29841 is characterized for operation from 0°C to 70°C.

FUNCTION TABLE

INPUTS

OUTPUT

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

2–1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54BCT29841, SN74BCT29841

10-BIT BUS-INTERFACE D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCBS024C – MARCH 1989 – REVISED NOVEMBER 1993

†

logic symbol

10D

10Q

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

logic diagram (positive logic)

To Nine Other Channels

Pin numbers shown are for the DW, JT, NT, and W packages.

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54BCT29841, SN74BCT29841

10-BIT BUS-INTERFACE D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCBS024C – MARCH 1989 – REVISED NOVEMBER 1993

†

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

Supply voltage range, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V

Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V

Voltage range applied to any output in the disabled or power-off state, V . . . . . . . . . . . . . . . . . – 0.5 V to 7 V

Voltage range applied to any output in the high state, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to V

Input clamp current, I (V < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA

Current into any output in the low state, I : SN54BCT29841 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA

SN74BCT29841 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA

Operating free-air temperature range: SN54BCT29841 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C

SN74BCT29841 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C

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

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only, and

functional operation of the device at these or any other conditions beyond those indicated in the “recommended operating conditions” section of

this specification is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.

recommended operating conditions

SN54BCT29841

MIN NOM MAX

SN74BCT29841

MIN NOM MAX

UNIT

Supply voltage

4.5

5.5

4.5

5.5

High-level input voltage

Low-level input voltage

Input clamp current

0.8

–18

–15

0.8

–18

–24

°C

High-level output current

Low-level output current

Operating free-air temperature

–55

125

2–3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54BCT29841, SN74BCT29841

10-BIT BUS-INTERFACE D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCBS024C – MARCH 1989 – REVISED NOVEMBER 1993

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

SN54BCT29841

SN74BCT29841

PARAMETER

TEST CONDITIONS

UNIT

†

MIN TYP

MAX

MIN TYP

MAX

= 4.5 V,

= 4.5 V

I = –18 mA

–1.2

= –15 mA

= –24 mA

= 24 mA

2.4

0.35

0.55

= 4.5 V

= 48 mA

0.42

0.55

0.1

–75

–0.2

–275

= 5.5 V,

= 5 V,

V = 7 V

0.1

–75

–0.2

–275

µA

V = 2.7 V

–10

–75

–10

–75

V = 0.5 V

µA

‡

= 0

= 2.7 V

= 0.5 V

OZH

OZL

CCL

CCH

CCZ

–20

µA

Outputs open

V = 2.5 V or 0.5 V

5.5

= 5 V,

= 2.5 V or 0.5 V

†

‡

All typical values are at V

= 5 V, T = 25°C.

Not more than one output should be tested at a time, and the duration of the test should not exceed one second.

timing requirements over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted)

= 5 V,

= 25°C

SN54BCT29841 SN74BCT29841

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

Pulse duration, LE high or low

Setup time, data before LE↓

High

Low

1.5

3.5

1.5

3.5

1.5

3.5

Hold time, data after LE↓

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

temperature, C = 50 pF (unless otherwise noted) (see Note 2)

= 5 V,

= 25°C

SN54BCT29841 SN74BCT29841

FROM

(INPUT)

(OUTPUT)

PARAMETER

UNIT

MIN

1.8

TYP

4.7

MAX

6.7

MIN

1.8

MAX

8.1

MIN

1.8

MAX

7.5

PLH

PHL

PLH

PHL

PZH

PZL

PHZ

PLZ

7.3

9.1

8.6

2.5

2.7

1.8

4.4

2.6

1.6

5.4

5.3

8.1

4.9

4.4

7.6

2.5

2.7

1.8

4.4

2.6

1.6

9.3

2.5

2.7

1.8

4.4

2.6

1.6

8.6

7.5

8.7

8.1

7.4

9.2

10.6

6.9

13.4

7.7

12.8

6.9

6.3

7.7

6.9

NOTE 2: Load circuits and voltage waveforms are shown in Section 1.

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF

DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

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WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER

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BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

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intellectual property right of TI covering or relating to any combination, machine, or process in which such

semiconductor products or services might be or are used. TI’s publication of information regarding any third

party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

SN54BCT29841_08 [TI]

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